127 results on '"Qinfu LIU"'
Search Results
2. Occurrence of Iron in the Minerals of Carboniferous Coal Gangue of the Pingshuo Open-pit Mine, North China
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Lihui Liu, Qinfu Liu, Yakui Li, Haiyue Cao, and Xingjian Kang
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Geochemistry and Petrology ,Earth and Planetary Sciences (miscellaneous) ,Soil Science ,Water Science and Technology - Published
- 2022
3. Geochemical characteristics and the significance of two major coal‐bearing strata claystones from the Datong Coalfield (North China)
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Linsong Liu, Jintao Li, Jing Zhang, Riwa Hao, Xingjian Kang, and Qinfu Liu
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Geology - Published
- 2022
4. Palaeoclimate, palaeosalinity and redox conditions control palygorskite claystone formation: an example from the Yangtaiwatan Basin, northwest China
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Lihui Liu, Shuai Zhang, Qinfu Liu, Linsong Liu, and Youjun Deng
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Geochemistry and Petrology - Abstract
Palygorskite-bearing claystones and mudstones were deposited in a salt lake in the middle and lower parts of the Neogene Baiyanghe Formation in the Yangtaiwatan Basin, China. The petrological, mineralogical and geochemical characteristics of the sediments were investigated to determine the factors controlling palygorskite formation. The palygorskite claystones and mudstones have distinctly varying mineral compositions. The claystones are composed of detrital minerals, palygorskite and illite, whereas the mudstones consist mainly of mixed-layer illite/smectite and illite. The palygorskite crystals were intact with sharp edges and interwoven with other minerals, indicating an authigenic origin. The chemical characteristics indicate that the palygorskite claystones in the middle part of the Baiyanghe Formation were deposited in a salt lake environment in an arid and hot climate. As the salinity of the lake gradually increased, the detrital minerals such as quartz, feldspar, dolomite and detrital clay minerals dissolved in the alkaline medium, thus providing Si4+, Mg2+and Al3+for the crystallization of palygorskite. The palygorskite coexists with certain amounts of detrital quartz and feldspar with limited roundness and sorting, indicating that the shallow lake of the basin under an oxidation environment may represent a favourable environment for the crystallization of palygorskite.
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- 2021
5. Effect of original crystal size of kaolinite on the formation of intercalation compounds of coal-measure kaolinite
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Yakui Li, Qinfu Liu, Linsong Liu, Lihui Liu, Dongshuang Hou, and Yingke Wu
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Mechanics of Materials ,Materials Chemistry ,General Materials Science - Published
- 2023
6. Provenance of multi-stage volcanic ash recorded in the Late Carboniferous coal in the Jungar Coalfield, North China, and their contribution to the enrichment of critical metals in the coal
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Shuai Zhang, Wei Xiu, Bo Sun, and Qinfu Liu
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Fuel Technology ,Stratigraphy ,Economic Geology ,Geology - Published
- 2023
7. Correction: Thermal decomposition and oxidation of pyrite with different morphologies in the coal gangue of North China
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Lihui Liu, Qinfu Liu, Kenan Zhang, Shuai Zhang, Kuo Li, Jintao Li, and Gaoyu Peng
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Physical and Theoretical Chemistry ,Condensed Matter Physics - Published
- 2022
8. The evolution of coal, examining the transitions from anthracite to natural graphite: a spectroscopy and optical microscopy evaluation
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Liang Yuan, Qinfu Liu, Kuo Li, Ying Quan, Xiaoguang Li, and Jonathan P. Mathews
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General Earth and Planetary Sciences - Published
- 2022
9. Genesis of Kaolinite Deposits in the Jungar Coalfield, North China: Petrological, Mineralogical and Geochemical Evidence
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Qinfu Liu, Tongjun Zhang, Linsong Liu, Jianping Liu, Kuo Li, Wanyue Liu, and Di Liu
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Geochemistry ,North china ,Kaolinite ,Geology - Published
- 2021
10. Mineralogy, Geochemistry, and Genesis of Kaolinitic Claystone Deposits in the Datong Coalfield, Northern China
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Hanlie Hong, Di Liu, Qinfu Liu, Linsong Liu, Thomas J. Algeo, Hao Zhang, Yongjie Yang, Gaoyu Peng, and Shuai Zhang
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Cryptocrystalline ,Geochemistry ,Soil Science ,Mineralogy ,020101 civil engineering ,02 engineering and technology ,Authigenic ,engineering.material ,021001 nanoscience & nanotechnology ,Feldspar ,0201 civil engineering ,Diagenesis ,Petrography ,Geochemistry and Petrology ,visual_art ,Illite ,Earth and Planetary Sciences (miscellaneous) ,visual_art.visual_art_medium ,engineering ,Sedimentary rock ,Parent rock ,0210 nano-technology ,Geology ,Water Science and Technology - Abstract
Gray-black kaolinitic claystones of industrial value are abundant in Upper Carboniferous–Lower Permian coal-bearing strata of the Datong Coalfield of northern China. The main types are tonsteins and cryptocrystalline kaolinitic claystones, distinguished by the thinness and greater crystallinity of kaolinite in the former and by the presence of detrital illite and authigenic pyrite in the latter. In order to determine the formation history of these two types of kaolinitic claystone, the petrological, mineralogical, and geochemical characteristics of borehole samples from the Upper Carboniferous Taiyuan Formation which comprises siliciclastics and coal seams deposited in a coastal environment, were analyzed. In addition to kaolinite, the claystones contain subordinate illite, quartz, pyrite, anatase, feldspar, siderite, and calcite. The tonsteins and cryptocrystalline kaolinitic claystones have different sources, as shown by petrographic data, elemental ratios, and chondrite-normalized rare earth element (REE) patterns. The volcanic origin of the tonsteins is revealed by an abundance of volcanic quartz and vitric fragments as well as Al2O3/TiO2, Zr/Hf, and Nb/Ta ratios consistent with a felsic igneous source. Their REE fraction was derived from feldspars or micas of the parent rocks, and the fraction decreased with alteration of these minerals to kaolinite. The sedimentary origin of the cryptocrystalline kaolinitic claystones is revealed by an abundance of detrital quartz and illite grains derived from either granite or sedimentary upper crust, and by the total REE contents (ΣREE) and (La/Yb)N values which are consistent with granitic material. Their depositional environment was in a transitional (coastal) setting (as shown by intermediate Sr/Ba ratios) hosting an open acidic hydrologic system (as shown by high chemical index of alteration (CIA) values indicative of intensive chemical weathering) that was suboxic to anoxic (as shown by high U/Th ratios and trace-metal enrichment factors). The present chemistry of these claystones was thus controlled by a combination of parent rock type and diagenetic alteration.
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- 2021
11. One-step synthesis of fluorinated graphene (FG) from natural coaly graphite (NCG) and the influence of NCG on the FG
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Ying Quan, Qinfu Liu, Kuo Li, Hao Zhang, Yakui Li, and Jing Zhang
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Mechanical Engineering ,Materials Chemistry ,General Chemistry ,Electrical and Electronic Engineering ,Electronic, Optical and Magnetic Materials - Published
- 2023
12. Enrichment of lithium in the claystone coal gangue from the Malan mine, Xishan Coalfield, Shanxi Province, Northern China
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Jintao Li, Linsong Liu, Xingjian Kang, Kuo Li, Shuai Zhang, and Qinfu Liu
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Geophysics ,Geochemistry and Petrology - Published
- 2023
13. Analysis of the microstructure and morphology of disordered kaolinite based on the particle size distribution
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Yongjie Yang, Maguy Jaber, Laurent J. Michot, Baptiste Rigaud, Philippe Walter, Lucie Laporte, Kenan Zhang, and Qinfu Liu
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Geochemistry and Petrology ,Geology - Published
- 2023
14. Structural Evolution of High-Rank Coals during Coalification and Graphitization: X-ray Diffraction, Raman Spectroscopy, High-Resolution Transmission Electron Microscopy, and Reactive Force Field Molecular Dynamics Simulation Study
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Kuo Li, Brian J. Teppen, Botao Song, Qinfu Liu, Shuai Zhang, Chenxi Cao, and Hao Zhang
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chemistry.chemical_classification ,Materials science ,Force field (physics) ,020209 energy ,General Chemical Engineering ,Analytical chemistry ,Anthracite ,Energy Engineering and Power Technology ,02 engineering and technology ,symbols.namesake ,Molecular dynamics ,Fuel Technology ,020401 chemical engineering ,chemistry ,X-ray crystallography ,0202 electrical engineering, electronic engineering, information engineering ,symbols ,Organic matter ,0204 chemical engineering ,Spectroscopy ,High-resolution transmission electron microscopy ,Raman spectroscopy - Abstract
The structure of organic matter in anthracite samples of different ranks and coal-derived natural graphites was investigated using XRD, micro-Raman spectroscopy, and HRTEM to determine XRD and Rama...
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- 2021
15. Quantifying the Structural Transitions of Chinese Coal to Coal-Derived Natural Graphite by XRD, Raman Spectroscopy, and HRTEM Image Analyses
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Hao Zhang, Jonathan P. Mathews, Yingke Wu, Qinfu Liu, and Liang Yuan
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Materials science ,business.industry ,General Chemical Engineering ,technology, industry, and agriculture ,Energy Engineering and Power Technology ,02 engineering and technology ,respiratory system ,021001 nanoscience & nanotechnology ,complex mixtures ,respiratory tract diseases ,symbols.namesake ,Intrusion ,Fuel Technology ,020401 chemical engineering ,Chemical engineering ,otorhinolaryngologic diseases ,symbols ,Coal ,0204 chemical engineering ,0210 nano-technology ,Raman spectroscopy ,Natural graphite ,business ,High-resolution transmission electron microscopy - Abstract
The macromolecular evolution of coal in proximity to intrusion zones provides a means of exploring the coal to coal-derived natural graphite (CDNG) transitions. Here, samples with different metamor...
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- 2021
16. GENESIS OF PALYGORSKITE IN THE NEOGENE BAIYANGHE FORMATION IN YANGTAIWATAN BASIN, NORTHWEST CHINA, BASED ON THE MINERALOGICAL CHARACTERISTICS AND OCCURRENCE OF ENRICHED TRACE ELEMENTS AND REE
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Shuai Zhang, Brian J. Teppen, Zhichuan Qiao, Lihui Liu, Bingjie Zhang, and Qinfu Liu
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Geochemistry ,Soil Science ,020101 civil engineering ,02 engineering and technology ,engineering.material ,Feldspar ,0201 civil engineering ,chemistry.chemical_compound ,Geochemistry and Petrology ,Earth and Planetary Sciences (miscellaneous) ,medicine ,Kaolinite ,Chlorite ,Water Science and Technology ,Calcite ,Palygorskite ,Authigenic ,021001 nanoscience & nanotechnology ,chemistry ,visual_art ,Illite ,visual_art.visual_art_medium ,engineering ,0210 nano-technology ,Clay minerals ,Geology ,medicine.drug - Abstract
Palygorskite-rich mudstone interbedded with gypsum occurs in the Neogene Baiyanghe Formation in the Yangtaiwatan basin, northwest China, but the genesis of palygorskite in the mudstone is unclear. The objective of the present study was to clarify the manner by which the palygorskite evolved by analyzing the mineralogical and geochemical characteristics of the mudstone. The mineralogical composition of bulk-rock mudstone consisted of clay minerals, quartz, feldspar, dolomite, calcite, and gypsum. Palygorskite is dominant in the clay fraction together with illite and accessory chlorite and kaolinite. The interwoven rod-like palygorskite aggregates and delicate palygorskite particles indicated an authigenic origin. The bulk rock of palygorskite-rich mudstone was rich in the trace elements Cs, U, B, Li, Sb, Bi, and As, which, together with REE, all showed very positive correlation with major element oxides Al2O3, Fe2O3, MgO, K2O, and TiO2 of the mudstone, indicating that the REE and trace elements occurred mainly in the clay minerals. The detrital illite, chlorite, and kaolinite were the main original host of the REE and enriched trace elements. Statistical analyses showed that the authigenic palygorskite had strong affinity to such elements compared to the detrital clay minerals. In addition, the chondrite-normalized REE of the bulk mudstone showed essentially the same pattern irrespective of the proportions of detrital illite, kaolinite, chlorite, and authigenic palygorskite present in the samples. Thus, the conclusion reached was that palygorskite was generated from the dissolution of detrital clay minerals. The REE and enriched trace elements in authigenic palygorskite were inherited from the detrital clay minerals.
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- 2021
17. Structural order evaluation and structural evolution of coal derived natural graphite during graphitization
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Shuai Zhang, Kuo Li, Qinfu Liu, Hao Zhang, Rujia Ma, Yingke Wu, and Brian J. Teppen
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Materials science ,Stacking ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Full width at half maximum ,symbols.namesake ,Reflection (mathematics) ,G band ,Phase (matter) ,symbols ,General Materials Science ,Graphite ,Composite material ,0210 nano-technology ,High-resolution transmission electron microscopy ,Raman spectroscopy - Abstract
The structure of onset phase of coal derived natural graphite (CDNG for short), semi-graphite, and CDNG subjected to different metamorphic grade were investigated using XRD, Raman spectroscopy, and HRTEM to trace their structural evolution during graphitization. The transitional phases with different structural order exist in graphite field. A classification of these transitional phases is of particular importance to achieve the rational utilization of CDNG. The d(002)-spacing is used to distinguish the pre-phases of highly ordered CDNG (ordered CDNG) and highly ordered CDNG in graphite field. The asymmetry index (AI) of (002) reflection of XRD patterns and Raman parameters D1/G area ratio and FWHM of G band correlate well with d(002)-spacing of CDNG in the zone of semi-graphite to graphite, thus they are also proposed to evaluate the structural order of CDNG. For structural evolution of CDNG during graphitization, at the beginning, the BSUs composed of stacking aromatic layers arrange face to face and tend to link together laterally. Then adjacent BSUs link laterally to form long-range wrinkled layers. With graphitization, the wrinkled layers evolve to flat lamellae and turbostratic structure gradually disappears. Finally, the dislocations in stacking and in-plane defect of flat aromatic layers decrease to attain triperiodic graphite structure.
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- 2020
18. The Thermal Transformation Behavior and Products of Pyrite During Coal Gangue Combustion
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Lihui Liu, Qinfu Liu, Shuai Zhang, Yakui Li, and Longtao Yang
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Fuel Technology ,General Chemical Engineering ,Organic Chemistry ,Energy Engineering and Power Technology - Published
- 2022
19. Formation of Vermicular Kaolinite and Pseudomorphic Kaolinite after Sanidine from the Kristall Tonsteins of the No. 3-5 Coal Seams of the Taiyuan Formation, Datong Coalfield, Shanxi Province, China
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Shuai Zhang, Wei Xiu, Hui Xi, Linsong Liu, Bo Sun, Brian J. Teppen, and Qinfu Liu
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- 2022
20. Simultaneous Reduction and Polymerization of Graphene Oxide/Styrene Mixtures To Create Polymer Nanocomposites with Tunable Dielectric Constants
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Qinfu Liu, Ralph H. Colby, Jeffrey Shallenberger, Robert J. Hickey, Joshua E. Bostwick, Dandan Hou, and Everett S. Zofchak
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Quantitative Biology::Biomolecules ,Materials science ,Polymer nanocomposite ,Graphene ,Oxide ,Physics::Optics ,Dielectric ,Carbon black ,Carbon nanotube ,law.invention ,Styrene ,Condensed Matter::Soft Condensed Matter ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,chemistry ,Polymerization ,Chemical engineering ,law ,General Materials Science - Abstract
Polymer nanocomposites containing carbon nanomaterials such as carbon black, carbon nanotubes, and graphene exhibit exceptional mechanical, thermal, electrical, and gas-barrier properties. Although...
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- 2019
21. Paleoclimatic reconstruction during the North China Craton drifting: Evidence from hydrogen and oxygen isotope composition of kaolinite in coal-bearing strata claystone
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Linsong Liu, Xinyi Chen, Kuo Li, Yakui Li, Lihui Liu, and Qinfu Liu
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Paleontology ,Oceanography ,Ecology, Evolution, Behavior and Systematics ,Earth-Surface Processes - Published
- 2022
22. The preparation of high-yield uniform nanotubes from coal-measure kaolinite
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Yakui Li, Qinfu Liu, Jintao Li, Dongshuang Hou, Jing Zhang, and Jiaxing Li
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Geochemistry and Petrology ,Geology - Published
- 2022
23. The structural evolution and mutation of graphite derived from coal under the influence of natural igneous plutonic intrusion
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Hao Zhang, Kuo Li, Junmin Sun, Zhiming Sun, Liang Yuan, and Qinfu Liu
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Fuel Technology ,General Chemical Engineering ,Organic Chemistry ,Energy Engineering and Power Technology - Published
- 2022
24. Simultaneous fluorination and purification of natural block coaly graphite into fluorinated graphene with tunable fluorination degree
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Ying Quan, Qinfu Liu, Kuo Li, Hao Zhang, Yongjie Yang, and Jing Zhang
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History ,Polymers and Plastics ,Mechanics of Materials ,Materials Chemistry ,General Materials Science ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
25. [Application value of lung ultrasound in the diagnosis and severity assessment of ventilator-associated pneumonia]
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Jie, Li, Jinyuan, Zhu, Qinfu, Liu, Jinlan, Ma, Can, Li, and Xiaohong, Wang
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Intensive Care Units ,ROC Curve ,Humans ,Pneumonia, Ventilator-Associated ,Prognosis ,Lung ,APACHE ,Retrospective Studies ,Ultrasonography - Abstract
To explore the value of bedside lung ultrasound in the early diagnosis and severity assessment of ventilator-associated pneumonia (VAP).A prospective observational study was conducted in 60 patients with VAP (VAP group) and 62 patients without VAP (control group) who were admitted to department of intensive care unit of General Hospital of Ningxia Medical University from September 2018 to July 2020. The gender, age and underlying diseases of non-VAP group were matched with VAP group. The general clinical data such as gender, age, underlying diseases, department source of the patient, acute physiology and chronic health evaluation II (APACHE II) score, sequential organ failure assessment (SOFA) score were recorded. The body temperature, white blood cell count (WBC), procalcitonin (PCT), oxygenation index (PaO(1) General information: compared with non-VAP group, VAP group had more emergency surgery patients [51.7% (31/60) vs. 33.9% (21/62), P = 0.047], APACHE II score and SOFA score were significantly higher (APACHE II score: 15.4±5.7 vs. 13.4±3.4, P = 0.021; SOFA score: 8.8±4.2 vs. 6.3±3.3, P0.001), body temperature tended to rise (centigrade: 38.3±0.8 vs. 38.0±0.9, P = 0.054), more patients had airway purulent secretions [65.0% (39/60) vs. 41.9% (26/62), P = 0.011], and mechanical ventilation time and length of ICU stay were longer [mechanical ventilation time (days): 10.5 (6.6, 15.0) vs. 4.3 (3.0, 6.0), P0.001; length of ICU stay (days): 14.8 (9.0, 18.0) vs. 6.0 (4.0, 9.1), P0.001], 28-day mortality rate was higher [31.7% (19/60) vs. 9.7% (6/62), P = 0.003]. (2) Diagnostic efficacy evaluation: when lung ultrasound was positive, VPLUS ≥ 3 and PCT0.5 μg/L were used separately for the diagnosis of VAP, the sensitivity was 73.3%, 75.0%, 61.7%, respectively; the specificity was 80.6%, 58.1% and 59.7%, respectively; the 95% confidence interval (95%CI) was 0.685-0.842, 0.574-0.748, 0.514-0.694, respectively,all P0.05, positive lung ultrasound had good sensitivity and specificity. When positive lung ultrasound or VPLUS ≥ 3 were combined with PCT0.5 μg/L for tandem test, the specificity of VAP diagnosis was increased to 95.2% and 83.9%, respectively; but the specificity of VAP diagnosis of positive lung ultrasound combined with PCT0.5 μg/L was higher than VPLUS ≥ 3 combined with PCT0.5 μg/L (95.2% vs. 83.9%, P0.05). (3) Correlation analysis: LUSS showed a significant positive correlation with APACHE II and SOFA score (r values were 0.407, 0.399, P values were 0.001, 0.002, respectively), LUSS had no relation with PaOLung ultrasound can early detect VAP , and its diagnostic specificity is significantly improved when combined with PCT0.5 μg/L. LUSS is closely related to the severity of disease in VAP patients, therefore, lung ultrasound may be an effective method for early diagnosis and efficacy evaluation of VAP patients.
- Published
- 2021
26. A comparative study of synthetic tubular kaolinite nanoscrolls and natural halloysite nanotubes
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Qinfu Liu, Xiaoguang Li, Sridhar Komarneni, and Ding Wang
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Materials science ,Scanning electron microscope ,020101 civil engineering ,Geology ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Exfoliation joint ,Halloysite ,0201 civil engineering ,Adsorption ,Chemical engineering ,Geochemistry and Petrology ,Transmission electron microscopy ,Specific surface area ,engineering ,Kaolinite ,Fourier transform infrared spectroscopy ,0210 nano-technology - Abstract
Kaolinite (Kaol) nanoscrolls with a diameter of ~20 to 100 nm and length of ~0.25 to 2 μm were prepared from the exfoliation of Kaol precursor. New interlayer space and lumens could be obtained by delamination and exfoliation of platy Kaol while forming nanoscrolls. The morphological and structural differences between synthetic Kaol nanoscrolls and natural halloysite (Hal) nanotubes were invesigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetry-differential scanning calorimetry (TG-DSC), nitrogen adsorption-desorption techniques. TEM showed that Kaol nanoscrolls are thinner and longer than Hal nanotubes. Kaol nanoscrolls exhibited nitrogen adsorption-desorption isotherms and pore size distribution curves similar to those of Hal but the specific surface area and pore volume of the Kaol nanoscrolls were found to be 2 times higher than those of natural tubular Hal. Both the TG and DTA curves of Kaol nanoscrolls and Hal nanotubes indicated that small amount of adsorbed water was lost below 140 °C. The dehydroxylation of Kaol nanoscrolls occurred at 463 °C, which is between the dehydroxylation temperature of Kaol and that of Hal. The current comparative study of Kaol nanoscrolls and Hal nanotubes suggests that the former could possibly be substituted for the latter for improving some applications because of the higher surface area and different types of pore space of the Kaol nanoscrolls.
- Published
- 2019
27. Micro-Raman Spectroscopy of Microscopically Distinguishable Components of Naturally Graphitized Coals from Central Hunan Province, China
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Yinmin Zhang, Qinfu Liu, Susan M. Rimmer, and Kuo Li
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Materials science ,General Chemical Engineering ,Anthracite ,Analytical chemistry ,Energy Engineering and Power Technology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,symbols.namesake ,Fuel Technology ,Microcrystalline ,Inertinite ,020401 chemical engineering ,symbols ,Pyrolytic carbon ,Graphite ,Texture (crystalline) ,0204 chemical engineering ,0210 nano-technology ,Raman spectroscopy ,Vitrinite - Abstract
Micro-Raman spectroscopic analysis of microscopically distinguishable components in a series of high-rank coals (anthracite to graphitized coal) adjacent to a granitic pluton was used to assess the structural evolution of coal during natural graphitization. Microscopically identifiable components were differentiated into six groups: vitrinite; inertinite; microcrystalline graphite with a fine, granular texture and a low reflectance; pyrolytic carbon with layering normal to particle edges; and needle graphite and flake graphite, both of which are similar to commercial synthetic graphite. Approaching the intrusion, Raman spectra exhibit a distinctly different evolution for vitrinite and microcrystalline graphite: the D1 band of the first-order Raman spectrum becomes narrower and more intense for vitrinite, whereas the D1 band intensity decreases for the granular, microcrystalline graphite. A plot of full width at half-maximum for the D1 band versus R1 (intensity ratio of the D1 to the G band) indicates that...
- Published
- 2019
28. Nanofluidic energy conversion and molecular separation through highly stable clay-based membranes
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Andrew T. Smith, Hongfei Cheng, Zaili Hou, Sonia E. Chavez, Lan Liu, Luyi Sun, Xiaohui Jia, Yi Zhou, Qinfu Liu, Song Chen, Hao Ding, and Jingjing Liu
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Materials science ,Aqueous solution ,Renewable Energy, Sustainability and the Environment ,Sonication ,Cationic polymerization ,02 engineering and technology ,General Chemistry ,Permeance ,021001 nanoscience & nanotechnology ,chemistry.chemical_compound ,Montmorillonite ,Membrane ,Chemical engineering ,chemistry ,General Materials Science ,Lamellar structure ,0210 nano-technology ,Ion transporter - Abstract
Energy collection and molecular separation are two emerging applications based on membrane technologies. It remains a challenge to improve the separation performance of molecular channels. Meanwhile, the application of membranes is typically impeded by their poor stability under practical hydrous conditions. Herein, we present the fabrication of a uniformly lamellar membrane using montmorillonite nanosheets as building blocks. We managed to achieve nanofluidic ion transport and molecular separation simultaneously. The membrane nanochannels possess nanofluidic ion transport properties with an output power density of up to 0.18 W m−1 at a membrane thickness of 11.2 μm under a 1000-fold transmembrane concentration difference. The membrane also shows a water permeance of 429 L m−2 h−1 atm−1 at a thickness of 2.5 μm and high separation efficiency for both cationic and anionic dyes. Moreover, the montmorillonite-based membranes can maintain high stability under aqueous conditions with soaking, shaking, and even ultrasonication.
- Published
- 2019
29. Thermal activation and structural transformation mechanism of kaolinitic coal gangue from Jungar coalfield, Inner Mongolia, China
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Riwa Hao, Xueliang Li, Peijie Xu, and Qinfu Liu
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Geochemistry and Petrology ,Geology - Published
- 2022
30. Colquhounia Root Tablet Protects Rat Pulmonary Microvascular Endothelial Cells against TNF-α-Induced Injury by Upregulating the Expression of Tight Junction Proteins Claudin-5 and ZO-1
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Qinfu Liu, Wenjie Zhou, Guocui Shi, Shenmao Ma, Xigang Ma, and Jijia Bai
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0301 basic medicine ,Tight junction ,Cell growth ,Chemistry ,Lung injury ,Pharmacology ,Endothelial stem cell ,03 medical and health sciences ,030104 developmental biology ,Complementary and alternative medicine ,Apoptosis ,Tumor necrosis factor alpha ,MTT assay ,Claudin - Abstract
Background.There are currently limited effective pharmacotherapy agents for acute lung injury (ALI). Inflammatory response in the lungs is the main pathophysiological process of ALI. Our preliminary data have shown that colquhounia root tablet (CRT), a natural herbal medicine, alleviates the pulmonary inflammatory responses and edema in a rat model with oleic acid-induced ALI. However, the potential molecular action mechanisms underlining its protective effects against ALI are poorly understood. This study aimed to investigate the effects and mechanism of CRT in rat pulmonary microvascular endothelial cells (PMEC) with TNF-α-induced injury.Methods.PMECs were divided into 6 groups: normal control, TNF-α(10 ng/mL TNF-α), Dex (1×10-6M Dex + 10 ng/mL TNF-α), CRT high (1000 ng/mL CRT + 10 ng/mL TNF-α), CRT medium (500 ng/mL CRT + 10 ng/mL TNF-α), and CRT low group (250 ng/mL CRT + 10 ng/mL TNF-α). Cell proliferation and apoptosis were detected by MTT assay and flow cytometry. Cell micromorphology was observed under transmission electron microscope. The localization and expression of tight junction proteins Claudin-5 and ZO-1 were analyzed by immunofluorescence staining and Western blot, respectively.Results.TNF-a had successfully induced an acute endothelial cell injury model. Dex and CRT treatments had significantly stimulated the growth and reduced the apoptosis of PMECs (allp< 0.05 or 0.01) and alleviated the TNF-α-induced cell injury. The expression of Claudin-5 and ZO-1 in Dex and all 3 CRT groups was markedly increased compared with TNF-a group (allp< 0.05 or 0.01).Conclusion.CRT effectively protects PMECs from TNF-α-induced injury, which might be mediated via stabilizing the structure of tight junction. CRT might be a promising, effective, and safe therapeutic agent for the treatment of ALI.
- Published
- 2018
31. An efficient method to prepare aluminosilicate nanoscrolls under mild conditions
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Allyson T. Barrett, Qinfu Liu, Luyi Sun, Hao Zhang, Jingjing Liu, Yongjie Yang, Anna Marie LaChance, Songshan Zeng, and Shilong Zhang
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Materials science ,Metals and Alloys ,020101 civil engineering ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Environmentally friendly ,Catalysis ,0201 civil engineering ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Chemical engineering ,Aluminosilicate ,Materials Chemistry ,Ceramics and Composites ,Kaolinite ,0210 nano-technology - Abstract
The conventional approach to exfoliate kaolinite to form aluminosilicate nanoscrolls is very time-consuming. Herein, we report a novel method to prepare aluminosilicate nanoscrolls from kaolinite by catalysis of AlCl3 under mild conditions. This method is highly efficient, environmentally friendly, and can be easily scaled up for mass production.
- Published
- 2020
32. Highly efficient purification of natural coaly graphite via an electrochemical method
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Hao Zhang, Ying Quan, Kuo Li, Qinfu Liu, and Liang Yuan
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Materials science ,Graphene ,Filtration and Separation ,Electrolyte ,Electrochemistry ,Analytical Chemistry ,law.invention ,symbols.namesake ,X-ray photoelectron spectroscopy ,Chemical engineering ,law ,Yield (chemistry) ,symbols ,Graphite ,Fourier transform infrared spectroscopy ,Raman spectroscopy - Abstract
Due to the fine granularity of CG with the dissemination of non-graphite minerals, highly efficient purification of natural coaly graphite (CG) by low-cost, low-energy consumption and low-pollution methods remains a challenge. In this study, a novel and efficient electrochemical method is demonstrated for purifying natural CG. The electrochemical purification is carried out in a mixed electrolyte containing 0.5 M (NH4)2SO4 and 10% HF with an optimum potential sequence starting at + 2.5 V for a few minutes followed by a short burst of + 5 V. The CG purification mechanism is proposed based on the experimental results. There are three main factors, namely, the type of the graphite anode, the electrolyte and the applied voltage are critical for effectively electrochemical purification. It is interesting to find that the main purified products are graphene mixed with graphite aggregates at a yield of 68%. Raman analysis indicates that the purified CG has fewer structural defects than the natural CG after removing the non-graphite minerals. Moreover, the XPS and FTIR analysis demonstrate that no other functional groups are grafted onto the parent graphite during this purification process. In comparison with the electrolyte only containing HF, the adding of 0.5 M (NH4)2SO4 in the HF electrolyte could reduce the amount of HF by more than 50%, which cuts the cost and alleviates the impact on the environment.
- Published
- 2022
33. Thermal phase transition of pyrite from coal
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Yi Zhou, Hongfei Cheng, Qinfu Liu, and Peijie Xu
- Subjects
Materials science ,chemistry.chemical_element ,02 engineering and technology ,engineering.material ,01 natural sciences ,chemistry.chemical_compound ,Coal ,Physical and Theoretical Chemistry ,Pyrrhotite ,Sulfur dioxide ,business.industry ,Thermal decomposition ,Hematite ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Sulfur ,010406 physical chemistry ,0104 chemical sciences ,Thermogravimetry ,chemistry ,Chemical engineering ,visual_art ,engineering ,visual_art.visual_art_medium ,Pyrite ,0210 nano-technology ,business - Abstract
The thermal phase transition of pyrite from coal was studied using thermogravimetry and derivative thermogravimetric, infrared spectroscopy and X-ray diffraction (XRD). According to the XRD results, the phase transition of the pyrite starts at 350 °C, pyrrhotite and magnetite are intermediate products of the oxidation from pyrite to hematite. It was proposed that the main gases and volatile products released during the thermal decomposition of the pyrite are water (H2O) and sulfur dioxide (SO2). The existence of sulfate species in the roasted samples also verified the emissions. These results proved the phase transition of pyrite and explain that they have a rational relationship. The environmental impact related to the thermal phase transition has been discussed, although the pyrolyzation in natural environment is really a very complicated process, it is still able to understand the thermal habits of pyrite in coal by studying pyrite from coal and control surrounding conditions so as to reduce and improve the environmental impact of sulfur pollution.
- Published
- 2018
34. Comparison of the morphology, chemical composition and microstructure of cryptocrystalline graphite and carbon black
- Author
-
Shilong Zhang, Qinfu Liu, Ying Quan, and Shuai Zhang
- Subjects
Materials science ,Cryptocrystalline ,Scanning electron microscope ,Graphene ,020209 energy ,General Physics and Astronomy ,chemistry.chemical_element ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,Carbon black ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Surfaces, Coatings and Films ,law.invention ,chemistry ,Chemical engineering ,Transmission electron microscopy ,law ,0202 electrical engineering, electronic engineering, information engineering ,Graphite ,0210 nano-technology ,High-resolution transmission electron microscopy ,Carbon - Abstract
The structures of cryptocrystalline graphite (CG) and carbon black (CB) have been analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), organic elemental analysis (OEA), X-ray diffraction (XRD), RAMAN and high-resolution transmission electron microscopy (HRTEM). These results indicate that CG has the same elemental composition as CB, with carbon being the major element present. SL sample (CG with low graphitization degree) and CB exhibit similar microcrystalline structures. CG was shown to contain a layered graphitic structure that was significantly different to the primary spherical particles present in CB. It is proposed that these CG sheets may potentially be reduced and delaminated to afford multilayer graphene structures with improved material properties.
- Published
- 2018
35. Geochemical and petrographic analysis of graphitized coals from Central Hunan, China
- Author
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Qinfu Liu, Susan M. Rimmer, and Kuo Li
- Subjects
Materials science ,business.industry ,020209 energy ,Stratigraphy ,Anthracite ,Mineralogy ,Geology ,02 engineering and technology ,010502 geochemistry & geophysics ,complex mixtures ,01 natural sciences ,Petrography ,Fuel Technology ,Inertinite ,Microcrystalline ,0202 electrical engineering, electronic engineering, information engineering ,Economic Geology ,Coal ,Graphite ,Pyrolytic carbon ,business ,Vitrinite ,0105 earth and related environmental sciences - Abstract
Microcrystalline graphite can form from coal naturally as a result of igneous intrusion, but the mechanism of alteration from anthracite to graphite remains elusive. The occurrence of microcrystalline graphite in altered coal seams is not common globally; however, several microcrystalline graphite occurrences that are associated with igneous intrusions are currently being mined commercially in China. In this study, petrographic, geochemical, and X-ray diffraction analyses of a series of Carboniferous coals with different levels of graphitization were used to study transformations in coal structure and chemical composition evolution during natural graphitization. The graphitized coals were collected from mines located at varying distances from a large (~130 km2 in extent) Indosinian-period granite intrusion; the coals in this region have been highly altered by this intrusion. Mean random reflectance of the samples increases from 4.36% to 8.23% approaching the intrusion, but decreases to 4.58% in the most graphitized samples. Vitrinite and inertinite become difficult to distinguish under white light with increased coal rank, and newly formed components including pyrolytic carbon, needle graphite, and flake graphite are seen in the most graphitized samples. The pyrolytic carbon accumulated from a vapor phase that was likely generated during intrusion. The needle and flake graphite occur as fracture and void fills and probably represent graphitization of a mobile phase that migrated through the coal. Timing of generation and the source of the mobile phase is unclear, but predates graphitization and could have been associated with the intrusion event. Microcrystalline graphite, with a characteristic texture consisting of fine granular particles, is the dominant component in the most graphitized samples. Reflectance of microcrystalline graphite using standard coal procedures does not accurately reflect its rank. Approaching the intrusion, structural parameters show a progressive change, especially in highly graphitized coals. Samples closest to the intrusion have transformed into graphite (as confirmed by X-ray diffraction and geochemical data). A plot of volatile matter (VM) versus Rr suggests that the maturation pathway for graphitized coals differs from that of coals that have undergone normal burial maturation. Elemental changes in graphitized coals also differ from coals that have been intruded by smaller-scale sills and dikes. This is probably due to the extreme level of metamorphism associated with the large-scale intrusion that graphitized these coals.
- Published
- 2018
36. Urea-assisted liquid-phase exfoliation of natural graphite into few-layer graphene
- Author
-
Bohui Xu, Zhichuan Qiao, Shuli Ding, Dandan Hou, Qinfu Liu, Yingke Wu, and Xianshuai Wang
- Subjects
Materials science ,Graphene ,Intercalation (chemistry) ,General Physics and Astronomy ,Nanoparticle ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Exfoliation joint ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Urea ,Graphite ,Physical and Theoretical Chemistry ,0210 nano-technology ,Dispersion (chemistry) ,Natural graphite - Abstract
The mass production of graphene with high quality is desirable for its wide applications. Here, we demonstrated a facile method to exfoliate natural graphite into graphene in organic solvent by assisting of urea. The exfoliation of graphite may originate from the “molecular wedge” effect of urea, which can intercalate into the edge of natural graphite, thus facilitating the production of graphene dispersion with a high concentration up to 1.2 mg/mL. The obtained graphene is non-oxidized with negligible defects. Therefore, this approach has great promise in bulk production of graphene with superior quality for a variety of applications.
- Published
- 2018
37. Mechanism responsible for intercalation of dimethyl sulfoxide in kaolinite: Molecular dynamics simulations
- Author
-
Shuai Zhang, Brian J. Teppen, Hongfei Cheng, Cun Liu, Feng Gao, and Qinfu Liu
- Subjects
Hydrogen bond ,Dimethyl sulfoxide ,Intercalation (chemistry) ,Inorganic chemistry ,Geology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Article ,0104 chemical sciences ,Hydrophobic effect ,Molecular dynamics ,Crystallography ,chemistry.chemical_compound ,Octahedron ,chemistry ,Geochemistry and Petrology ,Atom ,Kaolinite ,0210 nano-technology - Abstract
Intercalation is the promising strategy to expand the interlayer region of kaolinite for their further applications. Herein, the adaptive biasing force (ABF) accelerated molecular dynamics simulations were performed to calculate the free energies involved in the kaolinite intercalation by dimethyl sulfoxide (DMSO). Additionally, the classical all atom molecular dynamics simulations were carried out to calculate the interfacial interactions between kaolinite interlayer surfaces and DMSO with the aim at exploring the underlying force that drives the DMSO to enter the interlayer space. The results showed that the favorable interaction of DMSO with both kaolinite interlayer octahedral surface and tetrahedral surface can help in introducing DMSO enter kaolinite interlayer. The hydroxyl groups on octahedral surface functioned as H-donors attracting the S=O groups of DMSO through hydrogen bonding interaction. The tetrahedral surface featuring hydrophobic property attracted the methyl groups of DMSO through hydrophobic interaction. The results provided a detailed picture of the energetics and interlayer structure of kaolinite-DMSO intercalate.
- Published
- 2018
38. Dispersibility of Kaolinite-Rich Coal Gangue in Rubber Matrix and the Mechanical Properties and Thermal Stability of the Composites
- Author
-
Kenan Zhang, Hao Zhang, Linsong Liu, Yongjie Yang, Lihui Liu, and Qinfu Liu
- Subjects
reinforcement ,modification ,technology, industry, and agriculture ,dispersion ,Geology ,composite ,Mineralogy ,Geotechnical Engineering and Engineering Geology ,calcination ,SBR ,complex mixtures ,QE351-399.2 - Abstract
The aim of this work was to investigate the dispersibility of kaolinite-rich coal gangue in rubber matrix, the mechanical properties and thermal stability of coal gangue/styrene butadiene rubber (SBR) composites, and to compare these properties to those of the same coal gangue but had undergone thermal activation and modification. Several experimental techniques, such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), thermogravimetric-differential scanning calorimetry (TG-DSC), laser-scattering particle analyzer were adopted to characterize the coal gangue particles and then the obtained composites. The results demonstrated the raw coal gangue (RCG) was mainly composed of kaolinite. Calcination led to amorphization of thermal activated coal gangue (ACG), increased hydrophilicity and void volume, and decreased pH. The grain size of ACG became coarser than RCG, but ACG turned loose confirmed by higher degree of refinement after grinding. Modification enhanced the hydrophobicity of the coal gangue and improved its dispersibility than fillers without modification. Calcined samples had better dispersibility than uncalcined fillers. Additionally, the coal gangue treated by calcinating, grinding and modifying (MGA) had the best dispersion in rubber matrix. Either calcination or modification could improve the mechanical properties and thermal stability of coal gangue filled rubber, while the performance of MGA reinforced SBR (MGA-SBR) was the best. The enhanced performance of the MGA-SBR was owed to better dispersion of particles as well as stronger interactions between particles and rubber macromolecules.
- Published
- 2021
39. Control of coal-bearing claystone composition by sea level and redox conditions: An example from the Upper Paleozoic of the Datong Basin, North China
- Author
-
Hanlie Hong, Linsong Liu, Hao Zhang, Kenan Zhang, Thomas J. Algeo, Shuai Zhang, and Qinfu Liu
- Subjects
Recrystallization (geology) ,Dolomite ,Geochemistry ,020101 civil engineering ,Geology ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,0201 civil engineering ,Siderite ,chemistry.chemical_compound ,chemistry ,Geochemistry and Petrology ,Clastic rock ,Illite ,engineering ,Paleosalinity ,Kaolinite ,Sedimentary rock ,0210 nano-technology - Abstract
In order to investigate the genesis of different types of claystones and facies-related variations in clay mineralogy, a mineralogical and geochemical investigation of the coal-bearing Upper Carboniferous Taiyuan Formation of North China was undertaken in the Wangping and Xiaoyu mines of the SE Datong Basin. This formation contains both kaolinitic and mixed-layer illite/smectite (I/S) claystones having distinctly different compositions. The former is composed of kaolinite with minor illite, quartz, calcite, and boehmite, whereas the latter consists mainly of R1 and R3 mixed-layer I/S clay and kaolinite with minor illite, siderite, quartz, dolomite, and anatase. The two types of claystone formed from the same parent materials, as shown by Al2O3/TiO2 ratios and rare earth element (REE) patterns. Paleosalinity indices (B/Ga and Sr/Ba) and redox proxies (Mo and U enrichment factors and Corg/P ratios) indicate that the kaolinitic claystones formed under freshwater, oxic-anoxic conditions, whereas the I/S claystones formed under brackish, oxic-suboxic conditions. Chemical index of alteration (CIA) values show that the kaolinitic claystones experienced more intense leaching than the I/S claystones, even though both formed in a warm and humid climate, and this result is consistent with late Carboniferous-early Permian global climate and weathering intensity. The kaolinite developed through recrystallization and alteration of terrigenous clastics and an aluminosilicate colloidal solution in a reducing, freshwater peaty swamp environment. The formation of smectite was linked to marine transgressions that altered the salinity and oxygen content of sedimentary porewaters, with subsequent deep-burial conversion of smectite to mixed-layer I/S. The frequent changes in salinity and redox conditions that caused mineralogical variations in Taiyuan Formation claystones were driven by glacio-eustatic fluctuations of the Late Paleozoic Ice Age (LPIA), which led to episodic marine incursions into the Datong Basin.
- Published
- 2021
40. Preparation, morphology, and structure of kaolinites with various aspect ratios
- Author
-
Luyi Sun, Ding Wang, Qinfu Liu, Shilong Zhang, Junkai He, and Yongjie Yang
- Subjects
Materials science ,Morphology (linguistics) ,Scanning electron microscope ,Potassium ,Intercalation (chemistry) ,chemistry.chemical_element ,Mineralogy ,020101 civil engineering ,Geology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,0201 civil engineering ,Crystallinity ,chemistry ,Chemical engineering ,Geochemistry and Petrology ,Transmission electron microscopy ,Particle-size distribution ,Kaolinite ,0210 nano-technology - Abstract
A series of four kaolinite (Kaol) samples with various aspect ratios were prepared via a multi-step treatment consisting of intercalating Kaol by potassium acetate, ball-milling, de-intercalation, and classification. The morphology and structure of the samples were characterized by particle size analysis, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-Ray diffraction (XRD). Compared with intercalation by potassium acetate only or ball-milling only, intercalation followed by ball-milling was proved to be a much more effective method to delaminate Kaol to generate high aspect ratio samples. The results showed that the grade of structural order increased with an increase of Kaol aspect ratio, which was supported by an increase of Hinckley index calculated from their XRD patterns. This method offers a facile and scalable production of Kaol with various aspect ratios for different applications.
- Published
- 2017
41. Thermal decomposition of selected coal gangue
- Author
-
Bohui Xu, Qinfu Liu, Bo Ai, Ray L. Frost, and Shuli Ding
- Subjects
Thermogravimetric analysis ,Materials science ,chemistry.chemical_element ,Mineralogy ,02 engineering and technology ,engineering.material ,complex mixtures ,01 natural sciences ,otorhinolaryngologic diseases ,Kaolinite ,Coal ,Physical and Theoretical Chemistry ,Thermal analysis ,business.industry ,Thermal decomposition ,Metallurgy ,technology, industry, and agriculture ,respiratory system ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,respiratory tract diseases ,010406 physical chemistry ,0104 chemical sciences ,chemistry ,Illite ,engineering ,0210 nano-technology ,business ,Carbon ,Pyrolysis - Abstract
The thermal behavior of two mineral-type coal gangues under different temperature conditions was investigated by heating treatment of kaolinite-type coal gangue and illite-type coal gangue based on thermal analysis, X-ray diffraction (XRD), infrared spectroscopy (IR) and scanning electron microscopy (SEM). Thermogravimetric, differential thermogravimetric and differential scanning calorimetry results show the thermal decomposition process of kaolinite-type coal gangue and illite-type coal gangue can be divided into three stages, thermal decomposition of kaolinite and illite clay minerals occurred in the first stage and the third stage, and thermal decomposition of carbon material in coal gangue samples occurred in the second stage. Compared with illite-type coal gangue, the volatile of kaolinite-type coal gangue is released more intensely and pyrolysis performance of kaolinite-type coal gangue was better; initial temperature of heat decomposition was lower. The XRD, IR and SEM results showed the mineral phase transformation of kaolinite-type coal gangue occurred at 500 °C, the microscopic kaolinite changed obviously and its flake and layered structure started to break, and the phase of kaolinite transformed into amorphous glassy state, which was metakaolinite. In contrast, the mineral phase transformation of illite-type coal gangue occurred at 900 °C. According to the results of various research methods, it is considered that the thermal stability of kaolinite-type coal gangue is lower than that of illite-type coal gangue. This study has some theoretical significance for the rational use of coal gangue to produce highly activity powder materials.
- Published
- 2017
42. Investigation on the Microstructure Evolution of High-Rank Coal from Xinhua County, Hunan, China
- Author
-
Qinfu Liu, Ding Wang, Hongfei Cheng, Dandan Hou, Kuo Li, and Xianjian Cui
- Subjects
010506 paleontology ,Materials science ,business.industry ,Biomedical Engineering ,Bioengineering ,General Chemistry ,010502 geochemistry & geophysics ,Condensed Matter Physics ,Microstructure ,01 natural sciences ,Statistics ,Rank (graph theory) ,General Materials Science ,Coal ,business ,China ,0105 earth and related environmental sciences - Published
- 2017
43. The formation mechanism of organoammonium-kaolinite by solid-solid reaction
- Author
-
Hongfei Cheng, Dandan Hou, Ding Wang, Ray L. Frost, and Qinfu Liu
- Subjects
chemistry.chemical_classification ,Intercalation (chemistry) ,Inorganic chemistry ,Salt (chemistry) ,020101 civil engineering ,Geology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,0201 civil engineering ,Thermogravimetry ,Adsorption ,Differential scanning calorimetry ,chemistry ,Geochemistry and Petrology ,Physical chemistry ,Kaolinite ,Molecule ,Fourier transform infrared spectroscopy ,0210 nano-technology - Abstract
Solid-solid reactions and its corresponding solution method have been utilized to study the formation and intercalation mechanism of organoammonium-kaolinite formed from quaternary ammonium salt and kaolinite (Kaol) by using a methoxy-modified Kaol as an intermediate. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), thermogravimetry and differential scanning calorimetry (TG–DSC) analysis. Results showed that butyl trimethylammonium and hexyl trimethylammonium ions were successfully intercalated into the silicate layers, while the larger ions (C n H 2n + 1 N(CH 3 ) 3 + , n ≥ 8) were not. The intercalated alkylammonium ions were lying flat and poorly packed between the interlayer spaces of Kaol. In addition, a similar thermal behavior in the products obtained by both methods was also revealed. During the intercalation process, the alkylammonium ions were introduced by ion-dipole intercalation. In addition to the ion-dipole force, some other factors may contributed to these results, such as the geometrical constraint, the pH value of the mixed solution, the adsorbed water molecules, and the charge distribution at the external surfaces (the latter three will play a role if solutions are used). When solid-state reaction was used, the attraction caused by ion-dipole force was not strong enough to overcome the geometrical constraints, therefore larger alkylammonium ions were not intercalated.
- Published
- 2017
44. Graphene Synthesis via Chemical Reduction of Graphene Oxide Using Lemon Extract
- Author
-
Qinfu Liu, Kuo Li, Hongfei Cheng, and Dandan Hou
- Subjects
Materials science ,Graphene ,Biomedical Engineering ,Oxide ,Bioengineering ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Lemon extract ,01 natural sciences ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,law ,Chemical reduction ,General Materials Science ,0210 nano-technology - Published
- 2017
45. A Special Issue on Emerging Nanogeosciences Nanogeosciences: A Revolutionary Challenge in Geosciences
- Author
-
Jianhui Zeng, Shuangfang Lu, Xueqiu Wang, Jingqiang Tan, Xiancai Lu, Tianhu Chen, Jienan Pan, Ying Ye, Keyu Liu, Jianguang Wu, Fei Huang, Bo Jiang, Xiuling Wu, Wei Chen, Quan Wan, Qinfu Liu, Jianxi Zhu, Jieshan Qiu, Jianchao Cai, Yiwen Ju, Min Wang, Hailing Liu, Caineng Zou, Anhuai Lu, Jianzhong Zheng, Jijun Li, and Hongping He
- Subjects
010504 meteorology & atmospheric sciences ,Biomedical Engineering ,Environmental science ,General Materials Science ,Bioengineering ,General Chemistry ,010501 environmental sciences ,Condensed Matter Physics ,01 natural sciences ,0105 earth and related environmental sciences - Published
- 2017
46. Nanogeosciences: Research History, Current Status, and Development Trends
- Author
-
Xueqiu Wang, Longyi Shao, Jianchao Cai, Yiwen Ju, Hongtai Chao, Min Wang, Shuangfang Lu, Hongping He, Xiancai Lu, Caineng Zou, Guochang Wang, Jieshan Qiu, Yan Sun, Quan Wan, Xiuling Wu, Qinfu Liu, Hailing Liu, Cheng Huang, Jianguang Wu, and Yue Sun
- Subjects
Materials science ,020209 energy ,Biomedical Engineering ,Exploratory research ,Bioengineering ,Environmental pollution ,02 engineering and technology ,General Chemistry ,Condensed Matter Physics ,Data science ,Automatic summarization ,Field (geography) ,0202 electrical engineering, electronic engineering, information engineering ,Geological disaster ,General Materials Science - Abstract
Nanogeosciences are the international frontier field for the recent cross-development of geosciences and nanotechnology, also are the combination of nanometer and earth. It is possible to research the morphology, structures, and components of the earth on a nanoscale and further reveal the nanoscale information recorded by the substances on the earth, relying on research means, experience, and achievements of fast-developing nanotechnology and in combination with geoscience. Based on the summarization of the existing academic achievements in ultra-microscopic reasearch on geosciences, the concept of nanogeosciences is put forward. Nanogeosciences are a series of geosciences, taking the matters on different layers of the earth as a research target, to reveal the information of nanoparticles and nanopores and their relationship with geoscientific phenomena and especially genetic types during the geoscientific processes on the basis of nanoscience and geoscience, as well as nanotechnology and geoscientific tools. Nanotechnology has been introduced in various branches of geosciences, at first nanogeology since the 1980s. From the nanogeology to nanogeosciences, nanogeosciences have witnessed three major developmental stages: exploratory research, development of several research directions, and the preliminary formation of the subject based on comprehensive research. Among them, relevant nanophenomena found in the field of geoscience have been observed and relevant geoscientific issues have been explored. In the nanogeosciences, the various branches formed by the combination of nanotechnology and geosciences has analyzed systematically, including: nano-mineralogy, nano-petrology, nano-geochemistry, nano-structural geology, nano-energy geology, nano-ore deposit geology, nano-earthquake geology, nano-environmental geology, nano-atmospheric science, and nano-marine science. The significant and groundbreaking scientific issues, along with the developing trend of nanogeosciences also has discussed, mainly include basic geological study, nano-ore deposit and unconventional energy, nano-mineralogy and coal-based materials, nanoparticles and environmental pollution, and nanostructure and geological disaster. Nanogeosciences are still in its initial stages but with a revolutionary challenge and huge prospects for development in geosciences.
- Published
- 2017
47. Modes of occurrences of major and trace elements in coals from Yangquan Mining District, North China
- Author
-
Qinfu Liu, Songlin Shi, Zhanjie Xu, and Qiming Zheng
- Subjects
business.industry ,technology, industry, and agriculture ,Trace element ,North china ,Anthracite ,Mineralogy ,chemistry.chemical_element ,Yttrium ,010501 environmental sciences ,010502 geochemistry & geophysics ,complex mixtures ,01 natural sciences ,Sedimentary depositional environment ,chemistry ,Geochemistry and Petrology ,Economic Geology ,Coal ,Leaching (metallurgy) ,business ,Inductively coupled plasma mass spectrometry ,Geology ,0105 earth and related environmental sciences - Abstract
Yangquan Mining District is a major location for anthracite coal production in China. Understanding the modes of occurrences of major and trace elements in Yangquan coal is significant both geochemically and environmentally, although most elements are more depleted than those in Chinese coal. Ten coal bench and two parting samples were collected from No. 15 Coal of Yangquan Mining District. X-ray diffraction analysis was used to determine the proportions of minerals in the Yangquan coal, and X-ray fluorescence and inductively coupled plasma mass spectrometry analyses were used to determine the contents of major element oxides and trace elements, respectively. The mineral assemblages, ash yield, and (CaO + MgO + Fe2O3)/(SiO2 + Al2O3) ratio varied significantly in the vertical direction, which is attributed mainly to vertical variation in the depositional environment. The major element oxides and trace elements in the Yangquan coal were divided into four groups according to cluster analysis, which represent organic or inorganic affinity and different modes of occurrences. The coal benches underlying partings exhibited a rare-earth element and yttrium (REY) distribution pattern characterized by heavy (H)-type. This result differs from other coal benches characterized by light (L)-type REY, which is attributed to the leaching of overlying partings.
- Published
- 2017
48. Methoxy-grafted kaolinite preparation by intercalation of methanol: Mechanism of its structural variability
- Author
-
Qinfu Liu, Xiaoguang Li, Kuo Li, Xianjian Cui, Sridhar Komarneni, Sen Wang, and Ding Wang
- Subjects
Dimethyl sulfoxide ,Intercalation (chemistry) ,Inorganic chemistry ,020101 civil engineering ,Geology ,02 engineering and technology ,021001 nanoscience & nanotechnology ,Resonance (chemistry) ,0201 civil engineering ,chemistry.chemical_compound ,chemistry ,Geochemistry and Petrology ,Polymer chemistry ,Urea ,Molecule ,Kaolinite ,Methanol ,0210 nano-technology ,Hybrid material - Abstract
Methoxy-grafted kaolinite is an excellent organic-inorganic compound, which serves as a precursor to prepare new organic or inorganic kaolinite hybrid materials. Direct intercalation of kaolinite with dimethyl sulfoxide (DMSO), N -methylformamide (NMF) and urea (U) was achieved. All of the above intercalated kaolinites could be grafted by methoxy groups by reacting with methanol. The pre-intercalated molecules of DMSO, NMF and U blocked the grafting action at first but facilitated it at a later stage. Here, the mechanism of the structural collapse of methoxy-grafted kaolinite was proposed. Spontaneous deintercalation of small molecules such as water, ethanol, isopropanol and others was observed. Water and methanol molecules played an important role in the grafting action and also affected the structure of methoxy-grafted kaolinite. The d (001) of methoxy-grafted kaolinite was found to be in the range of 0.99–1.11 nm in wet state but constant at 0.86 nm for dry state. 13 C CP/MAS NMR analysis confirmed that inner-surface hydroxyls were replaced by methoxy groups from methanol as detected by a 13 C MASNMR resonance at 51 ppm assigned to methoxy groups. 13 C MASNMR spectra of intercalated kaolinites confirmed that the pre-intercalated molecules were not displaced completely even though it cannot be detected by XRD. The hygroscopicity of the pre-intercalated molecules was found to affect the structure of methoxy-grafted kaolinite.
- Published
- 2017
49. Green reduction of graphene oxide via Lycium barbarum extract
- Author
-
Sen Wang, Hao Zhang, Qinfu Liu, Hongfei Cheng, and Dandan Hou
- Subjects
Reducing agent ,Hydrazine ,Active components ,Oxide ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Oxygen ,law.invention ,Inorganic Chemistry ,chemistry.chemical_compound ,law ,Materials Chemistry ,Physical and Theoretical Chemistry ,biology ,Graphene ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,biology.organism_classification ,Combinatorial chemistry ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry ,Ceramics and Composites ,Lycium ,0210 nano-technology ,Carbon - Abstract
The synthesis of graphene from graphene oxide (GO) usually involves toxic reducing agents that are harmful to human health and the environment. Here, we report a facile approach for effective reduction of GO, for the first time, using Lycium barbarum extract as a green and natural reducing agent. The morphology and de-oxidation efficiency of the reduced graphene were characterized and results showed that Lycium barbarum extract can effectively reduce GO into few layered graphene with a high carbon to oxygen ratio (6.5), comparable to that of GO reduced by hydrazine hydrate (6.6). The possible reduction mechanism of GO may be due to the active components existing in Lycium barbarum fruits, which have high binding affinity to the oxygen containing groups to form their corresponding oxides and other by-products. This method avoided the use of any nocuous chemicals, thus facilitating the mass production of graphene and graphene-based bio-materials.
- Published
- 2017
50. Chrysanthemum extract assisted green reduction of graphene oxide
- Author
-
Ding Wang, Dandan Hou, Kuo Li, Hao Zhang, Hongfei Cheng, and Qinfu Liu
- Subjects
Materials science ,Reducing agent ,Graphene ,Oxide ,chemistry.chemical_element ,Nanotechnology ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Environmentally friendly ,Oxygen ,0104 chemical sciences ,law.invention ,chemistry.chemical_compound ,X-ray photoelectron spectroscopy ,chemistry ,Transmission electron microscopy ,law ,Chemical reduction ,General Materials Science ,0210 nano-technology - Abstract
The chemical reduction of graphene oxide (GO) usually involves highly toxic reducing agents which are injurious to the environment and human health. In the present study, chrysanthemum extract, as a natural and harmless reductant, mediated facile and green approach for the preparation of reduced GO (RGO) was reported for the first time. The reduction experiments of GO were conducted at room temperature, and the obtained RGO was few layered and exhibited high carbon to oxygen ratio (4.96) as demonstrated by transmission electron microscope (TEM) and X-ray photoelectron spectroscopy (XPS), respectively. The mechanism for removing of oxygen-containing functional groups from GO with chrysanthemum extract was proposed. The features of environmentally friendly and cost-effectively endow this approach with great promise in the preparation of various graphene-based materials, especially for biomaterials.
- Published
- 2016
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