34 results on '"Haitang Liu"'
Search Results
2. Design and Analysis of Flexible Capacitive Power Transfer With Stable Output Capability.
- Author
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Li Fang, Hong Zhou 0003, Wenshan Hu, Xingran Gao, Haitang Liu, and Qijun Deng
- Published
- 2022
- Full Text
- View/download PDF
3. Design of Distributed Curing Control System for Mass Concrete Pouring.
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Haitang Liu and Yanjun Fang
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- 2019
- Full Text
- View/download PDF
4. An efficient approach to fabricate lightweight polyimide/aramid sponge with excellent heat insulation and sound absorption performance
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Shunxi Song, Yujie Shi, Jiaojun Tan, Zeshi Wu, Meiyun Zhang, Sheng Qiang, Jingyi Nie, and Haitang Liu
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General Chemical Engineering - Published
- 2022
5. Analysis and validation of novel inverter and LCC-S topology-based WPT system
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Hong Zhou, Haitang Liu, Qijun Deng, and Li Fang
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Control and Systems Engineering ,Electrical and Electronic Engineering - Published
- 2022
6. Study on the removal of lignin from pre-hydrolysis liquor by laccase-induced polymerization and the conversion of xylose to furfural
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Jing Liu, Haitang Liu, Lin Chen, Yongzhen An, Xin Jin, Xuexiu Li, Zhong Liu, Guanhua Wang, and Rui Liu
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Environmental Chemistry ,Pollution - Abstract
High-value use of PHL to transform the platform compound furfural. Laccase polymerization through the combination of 5-5′ and 4-O-5′ bonds removes soluble lignin in PHL while protecting the sugar content from loss.
- Published
- 2022
7. Application strategy and effect analysis of nutritional support nursing for critically ill patients in intensive care units
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Yunting Li and Haitang Liu
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Intensive Care Units ,Nutritional Support ,Critical Illness ,Humans ,Prealbumin ,Transferrins ,General Medicine - Abstract
We investigate nutritional support and nursing status of critical patients in intensive care units (ICUs) to understand the latest nutritional support guidelines' implementation by clinical medical staff; identify problems in nutritional support and nursing for these patients, analyze causes, and present suggestions; and provide a clinical/theoretical bases to improve nutritional support implementation and nursing strategies for them. Clinical case information of 304 critically ill ICU patients admitted from July 2017 to July 2021 was analyzed. They were divided into the experimental (nutritional support) and control (no nutritional support) groups to compare their laboratory indicators, 28-day case fatality rate, and infection incidence. Least significant difference was used for postanalysis of statistically significant items to obtain pairwise comparisons. Nutrition support strategies for ICU patients are consistent with guidelines but have an implementation gap. No statistically significant differences were found in hemoglobin (HB), total serum protein (TP), serum albumin (ALB), transferrin (TF), prealbumin (PA), and total lymphocyte count (TLC) in experimental group patients compared with the control group within 24 hours (before nutritional support, P.05). No statistically significant differences were also found in HB, TP, TLC, and ALB between the enteral nutrition + parenteral nutrition (EN + PN), total EN (TEN), total PN (TPN), and control groups on admission day 7 (after nutritional support, P.05), while statistically significant differences existed between PA and TF (P.05). TF of patients supported by TEN was higher (statistically significant difference, P.05). PA in patients receiving TEN and EN + PN support was higher than in control group patients (statistically significant difference, P.05). Compared with the control group, in experimental group patients, infection incidence was significantly lower (40.2% vs 62.9%, P.05); incidence of complications was lower, but not statistically significant (40.2% vs 57.1%, P.05); and 28-day mortalities were significantly lower (26.7% vs 45.7%, P.05). Nutritional support can reduce hospitalization complications and 28-day mortality in critical patients, but its implementation must be standardized. Especially for patients with gastrointestinal dysfunction, personalized/standardized nutrition strategies and nursing procedures are needed when PN support is applied, and training of clinical medical staff should be strengthened to improve nutrition support's efficiency.
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- 2022
8. Research on the physical properties of calcium sulfate whisker and the effects of its addition on paper and its printing performance
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Yujie Gao, Jing Liu, Yongzhen An, Xuexiu Li, Xin Jin, Zhenhua Lu, Jie Li, Lin Chen, and Haitang Liu
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Materials science ,chemistry ,Chemical engineering ,Whisker ,food and beverages ,chemistry.chemical_element ,General Materials Science ,Forestry ,Calcium - Abstract
In this investigation, softwood pulp and bleached wheat straw pulp were used as raw materials, and Calcium Sulfate Whiskers (CSW) were used as fillers. Based on the structural properties and characteristics of CSW, the printing properties of the paper with CSW, such as whiteness, opacity, pH value, uniformity, Z-direction tensile strength and surface strength, were analyzed. The results showed that CSW has low solubility, high retention and fiber-like appearance. The whiteness of the paper is the best when the filling amount of CSW is 20 %. The paper opacity of softwood pulp increases significantly, and the opacity of bleached wheat straw pulp decreases significantly when CSW is more than 30 %. The addition reduces pH and surface strength of the paper. The evenness of the paper does not change obviously. The Z-direction tensile strength of the paper decreases in the softwood paper, but increases obviously in the bleached wheat straw paper.
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- 2021
9. Effects of phosphogypsum whiskers modification with calcium stearate and their impacts on properties of bleached softwood paper sheets
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Xin Jin, Haitang Liu, Jie Li, Yongzhen An, Xiaochen Chang, Yujie Gao, Jing Liu, Lin Chen, and Chunxia Pang
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animal structures ,Materials science ,Softwood ,integumentary system ,Mechanical Engineering ,General Chemical Engineering ,Whiskers ,Phosphogypsum ,General Chemistry ,Calcium stearate ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Media Technology ,General Materials Science - Abstract
By combining the structural properties and characteristics of phosphogypsum whiskers, a preliminary study on the modification of phosphogypsum whiskers and their application in papermaking was carried out. The effects of reaction temperature, reaction time, and reaction concentration on the solubility and retention of modified phosphogypsum whiskers and the effects of phosphogypsum whiskers on the physical properties of paper under different modified conditions were explored. The research results show that, after the phosphogypsum whiskers are modified with calcium stearate, a coating layer will be formed on the surface of the whiskers, which effectively reduces the solubility of the phosphogypsum whiskers. The best modification conditions are: the amount of calcium stearate relative to the absolute dry mass of the phosphogypsum whisker is 2.00%; the modification time is 30 min, and the modification temperature is 60°C. The use of modified phosphogypsum whiskers for paper filling will slightly reduce the whiteness, folding resistance, burst resistance, and tensile strength of the paper, but the tearing degree and retention of the filler will be increased to some extent.
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- 2021
10. Effects of calcium silicate synthesized in situ on Fiber loading and paper properties
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Xuexiu Li, Lanfeng Hui, Lin Chen, Zhiqiang Zhao, Yan Xu, Ying-Jian Huang, Xin Jin, Zhong Liu, Jie Li, Haitang Liu, Jing Liu, Shunxi Song, and Yongzhen An
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0106 biological sciences ,In situ ,food.ingredient ,Materials science ,Pulp (paper) ,Forestry ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,01 natural sciences ,chemistry.chemical_compound ,food ,chemistry ,010608 biotechnology ,Calcium silicate ,engineering ,General Materials Science ,Fiber ,Composite material ,0210 nano-technology ,Filler (animal food) - Abstract
The in-situ synthesis of calcium silicate in the fiber can not only meet the requirements for high loading of paper, but also make up and improve the reduction of paper performance caused by filling. In this investigation, the effects of pulp type, beating degree, fiber ratio, reaction time, rotational speed, dosage of lime milk and dispersant on calcium silicate loading and paper properties were investigated. The results showed that when the beating degree was 40 °SR, the ratio of softwood and hardwood pulp was 1:1, the reaction time was 60 min, the rotation speed was 600 r·min−1, the dosage of lime milk was 1.33 times of the theoretical amount, and the dosage of cationic polyacrylamide was 0.3 % (absolutely dry pulp), the ash content of hand-made sheet was 41.2 %, and the loading amount of calcium silicate was 26.3 %. Under this condition, the comprehensive performance of paper was the best.
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- 2021
11. Carboxymethylation modification, characterization, antioxidant activity and anti-UVC ability of Sargassum fusiforme polysaccharide
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Yongzhen An, Haitang Liu, Xuexiu Li, Jing Liu, Lin Chen, Xin Jin, Ting Chen, Wenqian Wang, Zhong Liu, Meiyun Zhang, and Fufeng Liu
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Molecular Weight ,Polysaccharides ,Organic Chemistry ,Sargassum ,General Medicine ,Biochemistry ,Methylation ,Antioxidants ,Analytical Chemistry - Abstract
Taking the degree of substitution (DS) as the index, the carboxymethylation conditions of Sargassum fusiforme polysaccharide (SFP) were studied. According to the single factor experiment results, the optimum experimental conditions were obtained: sodium hydroxide concentration, 15% (20 mL); alkalization temperature, 50 °C; dosage of chloroacetic acid 1.5 g; etherification time, 2 h, and the Carboxymethyl Sargassum fusiforme polysaccharide (CSFP) with the highest DS (0.635) was obtained. And then, the physicochemical properties, structural information and bioactivity of SFP and CSFP were characterized. The SFP and CSFP were composed of four monosaccharides, with a small amount of protein, and their molecular weights to 780.2 kDa and 386.3 kDa respectively. The results of FTIR and NMR showed that the carboxymethyl was successfully grafted onto the C-4 and C-6 of sugar chain. The results of anti UVC experiment showed that SFP and CSFP had a certain negative effect on cell activity, and the degree of damage caused by UVC radiation was weakened, and the anti UVC performance of CSFP was better than that of SFP.
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- 2022
12. A Ti-based bi-MOF for the tandem reaction of H2O2 generation and catalytic oxidative desulfurization
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Yue Yao, Shuxiang Lu, Haitang Liu, Xiaoyuan Liao, Qinglan Hao, Yi Cai, Meng Zhang, Wenjie Wei, and Yiqian Zhou
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Materials science ,Chemical substance ,Catalysis ,law.invention ,Flue-gas desulfurization ,chemistry.chemical_compound ,chemistry ,Magazine ,Cascade reaction ,Chemical engineering ,law ,Methanol ,Science, technology and society ,Visible spectrum - Abstract
In the past, H2O2 has been used as an oxidant when Ti-based materials are used as catalysts at ambient conditions. However, H2O2 suffers from high cost and safety concerns. Therefore, replacing H2O2 with O2 has been highly desired. In this study, a Ti-based bi-MOF, MIL-125(Ti)@NH2-MIL-125(Ti) has been synthesized through the internal extended growth of MIL-125(Ti) on NH2-MIL-125(Ti). This Ti-based bi-MOF performed in sequence to synergistically catalyze the oxidative desulfurization (ODS) reaction with O2. In this bi-MOF catalyst, MIL-125(Ti) is partly embedded and well distributed on the surface of NH2-MIL-125(Ti). NH2-MIL-125(Ti) serves as a catalyst for the production of H2O2 from O2/methanol under visible light, while MIL-125(Ti) serves as an ODS catalyst. The ODS over MIL-125(Ti) is the most effective as the in situ generated H2O2 could be used fully, and the consumed H2O2 (ODS reaction) also promotes further H2O2 production through the Le Chatelier's principle. MIL-125(Ti) and NH2-MIL-125(Ti) exist in close proximity in the bi-MOF material, which leads to an increase in the catalytic efficiency by 2.5-fold in comparison to that obtained from their physical mixture.
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- 2020
13. Homogeneously dispersed HPW/graphene for high efficient catalytic oxidative desulfurization prepared by electrochemical deposition
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Shuxiang Lu, Yiqian Zhou, Yue Yao, Haitang Liu, Yi Cai, Xiaoyuan Liao, and Yafei Huang
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Materials science ,Graphene ,Oxide ,General Physics and Astronomy ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electrochemistry ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Catalysis ,law.invention ,Flue-gas desulfurization ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,law ,High activity ,0210 nano-technology ,Hybrid material ,Deposition (law) - Abstract
In this work, reduced graphene oxide (rGO) with homogeneously dispersed phosphotungstate acid (HPW), were directly fabricated by using electrochemical strategy. In this one-pot route, the reduction of graphene oxide (GO) and HPW anchoring on rGO (HPW/rGO) have been achieved simultaneously. This strategy has not toxic reductants used, and meanwhile, produces high-quality rGO with sheet structure. Sheeted rGO could provide more anchor sites for HPW and prohibited HPW agglomeration. The produced HPW/rGO hybrid material performed high activity and durability in oxidative desulfurization (ODS) reaction due to the synergism of HPW and rGO. This work provides a novel sight for preparing high-efficient and stable catalyst for oxidative desulfurization.
- Published
- 2019
14. The Atmospheric Catalytic Liquefaction of Corn Stalk by Phosphoric Acid and Polyethylene Glycol For the Production of Biofuels
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Yongzhen An, Jing Liu, Jie Li, Zhiqiang Zhao, Zhong Liu, Lin Chen, Xin Jin, Yan Xu, and Haitang Liu
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chemistry.chemical_compound ,Stalk ,Chemical engineering ,Chemistry ,Biofuel ,Liquefaction ,Polyethylene glycol ,Phosphoric acid ,Catalysis - Abstract
The liquefaction and reuse of plant biomass have attracted the attention of researchers because the fossil energy is running out gradually, corn stalk waste is rich and can be converted into high quality biofuels through the liquefaction process. The effects of polyethylene glycol on the atmospheric liquefaction yield of corn stalk and the properties of biofuel products were investigated. It was found that the optimal temperature was 170 ℃, reaction time was 60 min, liquid solid ratio was 5:1, catalyst concentrated phosphoric acid dosage was10%, the maximum liquefaction rate reached 97.19%. GC-MS analysis showed that the composition of biofuels is complex, which mainly including alcohols, organic acids, esters, ketones, sugars and other compounds. Results of FT-IR demonstrated that the characteristic functional groups of cellulose, hemicellulose and lignin in liquefied corn stalk were almost completely disappeared, SEM analysis showed that the surface morphology of liquefaction residue and original corn stalk was completely different, the fiber structure could not be seen in the residue, all these phenomenons indicating that corn stalk was completely liquefied.
- Published
- 2021
15. The trans-superior articular process approach utilizing visual trephine: a more time-saving and effective percutaneous endoscopic transforaminal lumbar discectomy for migrated lumbar disc herniation
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Yunqing Wang, Ziqiang Zhu, Tang Xuebin, Dong Wei, Haitang Liu, Jiayuan Liu, and Liang Qiao
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medicine.medical_specialty ,Lumbar Vertebrae ,Percutaneous ,business.industry ,Lumbar discectomy ,Endoscopy ,Time saving ,Surgery ,Treatment Outcome ,Trephine ,medicine ,Humans ,Diskectomy, Percutaneous ,Neurology (clinical) ,Lumbar disc herniation ,business ,Process (anatomy) ,Intervertebral Disc Displacement ,Retrospective Studies - Abstract
To introduce, and to evaluate the efficacy of the trans-superior articular process (trans-SAP) approach utilizing visual trephine in percutaneous endoscopic transforaminal lumbar discectomy (PETLD) for migrated lumbar disc herniation.This study included 98 patients, 50 patients were in trans-SAP PETLD group and 48 patients were in conventional PETLD group. Visual analogue scale (VAS), Oswestry disability index (ODI), gender, age, blood loss, operation time, the frequency of X-ray fluoroscopy and the percentage of highly migrated herniation were evaluated and compared between the trans-SAP PETLD and conventional PETLD group.In both trans-SAP PETLD and conventional PETLD group, VAS and ODI were decreased at postoperative 1 day and 3 months compared with preoperative (p0.001). What's more, the VAS and ODI of postoperative 3 months were lower than postoperative 1 day (p0.001). There was no difference in gender, age, blood loss after the operation, and VAS during operation between trans-SAP group and conventional group (p0.05). The blood loss during the operation of trans-SAP group was higher (p0.05), but the operation time and frequency of X-ray fluoroscopy were lower than conventional group (p0.001). Last, trans-SAP group had a higher percentage of highly migrated herniation (p0.001).Both the conventional way and trans-SAP approach can achieve excellent surgical results. But, in trans-SAP group, the operation time is shorter, and X-ray fluoroscopy is less. PETLD with visual trephine has more advantages in highly migrated herniation and maybe easier to be mastered by young surgeons.
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- 2021
16. Characterization of the liquefaction residue from corn stalk and its biomass components using polyhydric alcohols with phosphoric acid
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Yan Zhang, Zhong Liu, Haitang Liu, Lanfeng Hui, Huimei Wang, and Haoyue Liu
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Environmental Engineering ,food and beverages ,Bioengineering ,Waste Management and Disposal - Abstract
Biomass liquefaction is a major process used to obtain fuel additives, valuable chemicals, and high-quality activated carbon. In this work, three major biomass components (cellulose, hemicellulose, and lignin) and corn stalk were liquefied, and the corresponding liquefaction residue yields were 0.62%, 14.56%, 1.98%, and 1.29%, respectively, using polyhydric alcohols and acid catalysis under atmospheric pressure. The liquefaction residues from the corn stalk and biomass components were analyzed by thermogravimetric analysis, pyrolysis-gas chromatography/mass spectrometry, X-ray diffraction, and scanning electron microscopy. It was found that the corn stalk residues were mainly large molecules produced by interactions of some small molecules and incompletely degraded cellulose; condensation polymers generated from the reaction of degraded substances derived from lignin or hemicellulose; and insoluble components containing reactants from the degraded substances of the three major components and the insoluble substances generated by the liquefaction agents during the process.
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- 2019
17. Carboxymethylation of polysaccharide isolated from Alkaline Peroxide Mechanical Pulping (APMP) waste liquor and its bioactivity
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Ting Chen, Haitang Liu, Fufeng Liu, Rui Liu, Mingqiang Zhu, Beibei Chen, Chuanling Si, Jie Li, Meiyun Zhang, Jing Liu, and Yongzhen An
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Proton Magnetic Resonance Spectroscopy ,Substituent ,Alkaline peroxide ,02 engineering and technology ,Microbial Sensitivity Tests ,Raw material ,Alkalies ,Polysaccharide ,Biochemistry ,Methylation ,PC12 Cells ,Antioxidants ,03 medical and health sciences ,chemistry.chemical_compound ,Structural Biology ,Polysaccharides ,Salmonella ,Spectroscopy, Fourier Transform Infrared ,Animals ,Carbon-13 Magnetic Resonance Spectroscopy ,Molecular Biology ,030304 developmental biology ,chemistry.chemical_classification ,Waste Products ,0303 health sciences ,Moisture absorption ,Temperature ,food and beverages ,Biological activity ,Humidity ,General Medicine ,021001 nanoscience & nanotechnology ,Alkali metal ,Xylan ,Anti-Bacterial Agents ,Peroxides ,Rats ,carbohydrates (lipids) ,Molecular Weight ,chemistry ,Xylans ,0210 nano-technology ,Oxidation-Reduction ,Nuclear chemistry ,Bacillus subtilis - Abstract
In recent years, the biological activity of polysaccharides and their derivatives has been widely studied. However, in addition to the natural polysaccharides directly extracted from plants and animals, there are rich polysaccharides in the pulping waste liquor that have not been fully utilized. The extracted polysaccharide from eucalyptus Alkaline Peroxide Mechanical Pulping (APMP) waste liquor was used as a raw material. For the production of carboxymethyl polysaccharide, the effects of temperature (T), the amount of alkali (NaOH) and the amount of etherifying agent (ClCH2COOH) on the degree of substitution (DS) were investigated, the optimal preparation conditions are: reaction time 2 h, temperature 75 °C, and the molar ratio of polysaccharide, NaOH and ClCH2COOH is 1:1:2, the highest DS is 1.47; FT-IR, NMR and GPC were used to characterize the structure and Molecular weight, the results show that the polysaccharide of APMP waste liquor is rich in xylan, and it was proved that the carboxymethyl substitution was successful and the positions of the substituent group were determined. The characterization and biological activity research of xylan polysaccharide (XP) and carboxymethyl xylan polysaccharide (CMXP), such as antioxidation, moisture absorption/retention, bacteriostatic action and cytotoxicity were discussed. CMXP shows better effects compared with XP.
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- 2020
18. Synthesis and characterization of temperature/pH dual sensitive hemicellulose-based hydrogels from eucalyptus APMP waste liquor
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Cuihua Dong, Jing Liu, Xuexiu Li, Jie Li, Yongzhen An, Chuanling Si, Haitang Liu, Ting Chen, and Meiyun Zhang
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Polymers and Plastics ,Polymers ,Radical polymerization ,Acrylic Resins ,macromolecular substances ,02 engineering and technology ,010402 general chemistry ,complex mixtures ,01 natural sciences ,Waste Disposal, Fluid ,chemistry.chemical_compound ,Polysaccharides ,Materials Chemistry ,Hemicellulose ,Acrylic acid ,chemistry.chemical_classification ,Eucalyptus ,Organic Chemistry ,technology, industry, and agriculture ,Temperature ,Hydrogels ,Polymer ,Hydrogen-Ion Concentration ,021001 nanoscience & nanotechnology ,Controlled release ,0104 chemical sciences ,Peroxides ,Monomer ,chemistry ,Chemical engineering ,Acrylamide ,Self-healing hydrogels ,0210 nano-technology - Abstract
In this investigation, a variety of innovative temperature/pH-sensitive hydrogels consisting of hemicellulose (extracted from APMP waste liquor) and acrylic acid/acrylamide monomers were synthesized via free radical polymerization for water retention agents and controlled release. The results showed that the hydrogel polymer was chemically cross-linked and entangled to form a three-dimensional network structure, and the monomer successfully grafted on the hemicellulose chain. The content of crosslinkers and monomers had obvious effects on the swelling ratio of hydrogel. The sensitivity of the hydrogel was determined according to the change of the swelling ratio of the hydrogel under different temperature and pH conditions, combined with the chemical structure analysis of the hydrogel, and explain its sensitivity mechanism. Finally, after 6 days at 25 °C and pH 6, the swelled hydrogel still retained 79.46 % of the moisture, which proved that it has high water retention ability.
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- 2020
19. Biomedical Applications of Hemicellulose-Based Hydrogels
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Xuejun Pan, Haitang Liu, Cuihua Dong, and Ting Chen
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Materials science ,Biocompatibility ,Nanotechnology ,Biocompatible Materials ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Artificial skin ,chemistry.chemical_compound ,Drug Delivery Systems ,Tissue engineering ,Polysaccharides ,Drug Discovery ,Hemicellulose ,Cellulose ,Pharmacology ,Tissue Engineering ,Organic Chemistry ,technology, industry, and agriculture ,Hydrogels ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,chemistry ,Wound dressing ,Drug delivery ,Self-healing hydrogels ,Molecular Medicine ,0210 nano-technology - Abstract
Background: Hydrogel has a three-dimensional network structure that is able to absorb a large amount of water/liquid and maintain its original structure. Hemicellulose (HC) is the second most abundant polysaccharide after cellulose in plants and a heterogeneous polysaccharide consisting of various saccharide units. The unique physical and chemical properties of hemicellulose make it a promising material for hydrogels. Methods: This review first summarizes the three research hotspots on the hemicellulose-based hydrogels: intelligence, biodegradability and biocompatibility. It also overviews the progress in the fabrication and applications of hemicellulose hydrogels in the drug delivery system and tissue engineering (articular cartilage, cell immobilization, and wound dressing). Results: Hemicellulose-based hydrogels have many unique properties, such as stimuliresponsibility, biodegradability and biocompatibility. Interpenetrating networking can endow appropriate mechanical properties to hydrogels. These properties make the hemicellulose-based hydrogels promising materials in biomedical applications such as drug delivery systems and tissue engineering (articular cartilage, cell immobilization, and wound dressing). Conclusion: Hydrogels have been widely used in biomedicine and tissue engineering areas, such as tissue fillers, drug release agents, enzyme encapsulation, protein electrophoresis, contact lenses, artificial plasma, artificial skin, and tissue engineering scaffold materials. This article reviews the recent progress in the fabrication and applications of hemicellulose-based hydrogels in the biomedical field.
- Published
- 2019
20. Characterization of liquefied products from corn stalk and its biomass components by polyhydric alcohols with phosphoric acid
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Huimei Wang, Zhong Liu, Lanfeng Hui, Haitang Liu, Haoyue Liu, and Yan Zhang
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Polymers and Plastics ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Lignin ,Zea mays ,Phase Transition ,Polymerization ,chemistry.chemical_compound ,Polysaccharides ,Materials Chemistry ,Organic chemistry ,Plant Oils ,Hemicellulose ,Phosphoric Acids ,Cellulose ,Phosphoric acid ,chemistry.chemical_classification ,Organic Chemistry ,technology, industry, and agriculture ,Diethylene glycol ,Polyphenols ,Polymer ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Stalk ,chemistry ,Solvolysis ,0210 nano-technology - Abstract
The hemicellulose, cellulose and lignin were directly separated from corn stalk, and their liquefaction processes were investigated via acid-catalyzed solvolysis treatment with 1,2-propylene glycol (PG) and diethylene glycol (DEG) to produce bio-oil and residues. The main components, functional groups and organics structure of bio-oil were analyzed by the FTIR, 1H-NMR, 13C-NMR, GCMS, and TGA. It was found that there had a similar tendency in the liquefaction processes of cellulose, hemicellulose and lignin. Corn stalk and its biomass components were degraded and formed plentiful low-molecular polymers by acid catalysis, prior to polymers were converted into corresponding PG/DEG-derivatives. Finally, low-molecular weight soluble substances and insoluble residues were generated by decomposition and polymerization. Additionally, more than 80% compounds' carbon number in four bio-oils was below 25. The residues were mostly stemmed from macromolecules produced by degradation products and PG/DEG or re-polymerization between degraded small molecules.
- Published
- 2018
21. The study of inhibitory effects and mechanism of carboxylate chitooligomer on melanin, prepared by laccase/TEMPO system
- Author
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Nengyuan Bian, Xiaoqin Zhen, Jing Wang, Xin Bu, Fangdong Zhang, Ying Li, Dongzhao Hao, Xinli Zhang, Jicheng Pei, and Haitang Liu
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Polymers and Plastics ,Tyrosinase ,Skin Lightening Preparations ,Oligosaccharides ,Chitin ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Medicinal chemistry ,Models, Biological ,Melanin ,Cyclic N-Oxides ,Levodopa ,chemistry.chemical_compound ,Materials Chemistry ,Chelation ,Carboxylate ,Tyrosine ,Enzyme Inhibitors ,Chelating Agents ,Laccase ,Melanins ,Chitosan ,biology ,Monophenol Monooxygenase ,Organic Chemistry ,Substrate (chemistry) ,Green Chemistry Technology ,021001 nanoscience & nanotechnology ,Enzyme assay ,0104 chemical sciences ,chemistry ,biology.protein ,0210 nano-technology ,Agaricales ,Oxidation-Reduction ,Copper - Abstract
A carboxylate chitooligomer (C-COS) containing carboxyl groups attached to chitooligomer (COS) molecules has been prepared by laccase/2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) system, which is a green-chemistry method. Several experiments were designed to evaluate inhibition effects on melanin and mechanisms of C-COS. The results indicated that C-COS exhibited more distinct anti-melanogenic effects compared to COS. C-COS inhibits melanin production with tyrosine (Tyr) and DOPA as the substrate of melanin formation, and the inhibition rates are, respectively, 89.07% and 84.45%, which reach 1.4–2 times those of COS. UV–vis spectroscopy was used to elucidate the interaction mechanism between C-COS and tyrosinase (TYR). It is C-COS chelating with metal Cu ions in tyrosinase (TYR) that decreases the enzyme activity. Half-maximal inhibitory concentrations (IC50) of C-COS were calculated as 13.49 and 4.07 mg/mL for monophenolase (cresolase) and diphenolase (catecholase), respectively.
- Published
- 2018
22. Interaction between PCC Filler and Cellulosic Fiber in Fiber/Filler Co-refining System.
- Author
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Sheng Qiang, Shunxi Song, Peiyao Wang, Yujie Shi, Linhao Li, and Haitang Liu
- Published
- 2021
- Full Text
- View/download PDF
23. Constructing Fe-based bi-MOFs for photo-catalytic ozonation of organic pollutants in Fischer-Tropsch waste water
- Author
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Lungang Chen, Yue Yao, Yinzhi Wang, Xuefeng Wang, Yi Cai, Qinglan Hao, Haitang Liu, Xiaoyuan Liao, Yulei Zhu, and Fan Wang
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Pollutant ,Ozone ,Environmental remediation ,Chemistry ,General Physics and Astronomy ,Fischer–Tropsch process ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Catalysis ,chemistry.chemical_compound ,Chemical engineering ,Wastewater ,Sewage treatment ,0210 nano-technology ,Hybrid material - Abstract
Fischer-Tropsch waste water (FTW) is with complex organic compositions, and is toxic/stinking odor. So far, FTW is very difficult to be treated in industry. In this work, Fe-based bi-MOFs heterojunctions, i.e., MIL-88A(Fe)@MIL-88B(Fe) are synthesized through internal extended growth of rod-like MIL-88A on spindle-like MIL-88B. The compositions, structure and characteristics are systematically investigated. By virtue of larger surface area, rich active sites and strong interfacial coupling, this bi-MOFs catalyst establish better h+-e− separation/transfer. As expected, this bi-MOFs hybrid materials shows remarkable photo-catalytic performance toward FTW remediation by the help of ozone. The COD removal in bi-MOFs/O3 system is 4.2 times higher than that of ozonation alone. Furthermore, h+, O2− and OH are the predominant active radicals for FTW remediation. Bi-MOFs displays acceptable stability after 5 cycles. This work provides a new way for photo-catalytic ozonation and may drive the development of MOFs-based photo-catalytic ozonation for waste water treatment, not limited in FTW.
- Published
- 2020
24. Functionalized g-C3N4 sheets assisted synthesis of growth-oriented MIL-88B-Fe with rod-like structure: Upgrading framework photo-catalytic performance and stability
- Author
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Qinglan Hao, Zhen Li, Xiaoyuan Liao, Yibei Wang, Shuxiang Lu, Wenjie Wei, Zaozao Xiao, Haitang Liu, and Fan Wang
- Subjects
Photo catalytic ,Materials science ,Visible light irradiation ,Composite number ,General Physics and Astronomy ,02 engineering and technology ,Surfaces and Interfaces ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Persulfate ,01 natural sciences ,0104 chemical sciences ,Surfaces, Coatings and Films ,Catalysis ,chemistry.chemical_compound ,chemistry ,Chemical engineering ,Covalent bond ,0210 nano-technology ,Benzoic acid - Abstract
In this study, it is first time reported that benzoic acid functionalized g-C3N4 (BF-g-C3N4) sheets assisted synthesis of (0 0 1) surface-oriented MIL-88B-Fe with rod-like structure (BF-CM-rod). Pristine g-C3N4 sheets leaded to produce (1 0 1) surface-oriented MIL-88B-Fe with diamond-like structure (CM-diamond). BF-CM-rod composite catalyst achieves covalent bond links between g-C3N4 and MIL-88B-Fe, performs better separation of h+-e− pairs, and leads to excellent photo-catalytic performance for pollutant removal under visible light irradiation, with persulfate (PS) as oxidant. Its photo-activity is almost 4.2, 2.0 and 1.3 times of g-C3N4, MIL-88B-Fe and CM-diamond, respectively. A possible mechanism is proposed to explain the improved photo-catalytic performance of the Vis/BF-CM-rod/PS system. This work provides a novel way to prepare shape controlled Fe-based metal-organic frameworks formed by covalent bonds.
- Published
- 2020
25. Constructing isotype CN/s-CN heterojunction with enhanced photocatalytic performance
- Author
-
Wenjie Wei, Xiaoyuan Liao, Zaozao Xiao, Qinglan Hao, Yibei Wang, Yafei Huang, Yi Cai, and Haitang Liu
- Subjects
Materials science ,Band gap ,Mechanical Engineering ,Heterojunction ,02 engineering and technology ,General Chemistry ,Electronic structure ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,chemistry ,X-ray photoelectron spectroscopy ,Materials Chemistry ,Photocatalysis ,Electrical and Electronic Engineering ,0210 nano-technology ,Melamine ,Carbon nitride - Abstract
Synthesis of highly efficient isotype carbon nitride/carbon nitride (CN/CN) heterojunction, is a hot topic in the photocatalysis field. In this study, isotype CN/s-doped CN heterojunction is facile constructed with mixed precursor (melamine and trithiocyanuric acid). The structures and properties of CN/s-CN samples are systematically characterized by XRD, IR, TEM, TG, UV–vis, XPS, electrochemical and photo-catalytic degradation test. The synergistic CN and s-CN can significantly overcome the intrinsic drawback of rapid h+-e− recombination of CN or s-CN only. The CN/s-CN altered electronic structure, including narrowed band gap, upshifted band edge potential and improved electronic conductivity, and achieves 2.1 times activity than that of pristine CN.
- Published
- 2020
26. The hydration mechanism and hydrogen bonding structure of 6-carboxylate chitooligosaccharides superabsorbent material prepared by laccase/TEMPO oxidation system
- Author
-
Fangdong Zhang, Zhimin Zhou, Jing Wang, Xin Bu, Haitang Liu, Xinli Zhang, Huifang Chan, Xiaoqin Zhen, and Jicheng Pei
- Subjects
chemistry.chemical_classification ,Laccase ,Polymers and Plastics ,Hydrogen bond ,Organic Chemistry ,Intermolecular force ,02 engineering and technology ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Ion ,chemistry.chemical_compound ,Differential scanning calorimetry ,chemistry ,Polymer chemistry ,Materials Chemistry ,Molecule ,Carboxylate ,0210 nano-technology - Abstract
6-carboxylate chitooligosaccharides (6-CCOS), as a superabsorbent material, were prepared by way of the laccase/TEMPO oxidation system. It exhibited a higher moisture-absorption ability and stronger affinity for water. To understand the real reasons for this, the hydrogen bonding structure of 6-CCOS and the hydration mechanism of the molecule were investigated using infrared (IR), differential scanning calorimetry (DSC), and nuclear magnetic resonance (NMR). It was found that the introduction of a strongly hydrophilic carboxylate ion on the C6 site of chitooligosaccharides molecule was conducive to the enhancement of the interaction between polysaccharide polymers and water molecules. The most important was the formation of hydrogen bonds connected between carboxylate ion and residual water. In addition, the hydration mechanism of 6-CCOS molecules was presumed to be that more water molecules from outside were incorporated into the already embedded water molecules within the polymer. The whole molecule was woven into a huge water-polymer network structure through intermolecular hydrated hydrogen bonds.
- Published
- 2017
27. Improvement of Furfural Production from Concentrated PreHydrolysis Liquor (PHL) of a Kraft-Based Hardwood Dissolving Pulp Production Process
- Author
-
Haitang Liu, Huiren Hu, M. Sarwar Jahan, and Ni Yonghao
- Subjects
integumentary system ,Carbonization ,General Chemical Engineering ,food and beverages ,General Chemistry ,Xylose ,Biorefinery ,Pulp and paper industry ,Furfural ,Xylan ,chemistry.chemical_compound ,chemistry ,Lignin ,General Materials Science ,Dissolving pulp ,Kraft paper - Abstract
Hemicelluloses present in the prehydrolysis liquor (PHL) of the hardwood kraft-based dissolving pulp production process can be utilized in the production of furfural, which is an important renewable, non-petroleum-based platform chemical. A lower furfural yield was observed from the concentrated sugars in PHL in acetic-acid-catalyzed systems. The reaction rate of sugar consumption and furfural destruction in PHL was higher than those of model xylan and xylose systems, which may be due to the side-reactions of lignin with sugars and carbonization of oligomeric sugars. In order to minimize these side-reactions, a steam-stripping method of generated furfural was adopted. The results showed that the method was effective in increasing the furfural yield (41.5%) from the concentrated PHL.
- Published
- 2015
28. Kinetics of furfural production from pre-hydrolysis liquor (PHL) of a kraft-based hardwood dissolving pulp production process
- Author
-
M. Sarwar Jahan, Yonghao Ni, Laboni Ahsan, Huiren Hu, Mir Mojtaba Baktash, and Haitang Liu
- Subjects
integumentary system ,Renewable Energy, Sustainability and the Environment ,Forestry ,Sulfuric acid ,Xylose ,Furfural ,Catalysis ,chemistry.chemical_compound ,Hydrolysis ,Acetic acid ,chemistry ,Organic chemistry ,Dissolving pulp ,Waste Management and Disposal ,Agronomy and Crop Science ,Kraft paper - Abstract
The kinetics of C-5 sugars (xylose/xylan) conversion to furfural in an industrial pre-hydrolysis liquor (PHL) in both acetic acid (HAc)-catalyzed system and sulfuric acid (H 2 SO 4 )-catalyzed system, were determined in a temperature range of 150–190 °C. The main reactions involved during the process included: 1) C-5 sugars consumption for furfural formation and side reactions; 2) furfural degradation. It was found that these reactions followed first order kinetics. A consecutive reaction model (from xylose to furfural, then to degradation products) fitted into the data obtained in the H 2 SO 4 -catalyzed system; while a consecutive/parallel model suited for the HAc-catalyzed system due to side reactions, which also consumed C-5 sugars. The activation energy for C-5 sugar disappearance, and the furfural degradation, was 151 kJ mol −1 and 115 kJ mol −1 , respectively, in the HAc-catalyzed system.
- Published
- 2014
29. Purification of Hemicelluloses in Pre-Hydrolysis Liquor of Kraft-Based Dissolving Pulp Production Process Using Activated Carbon and Ion-Exchange Resin Adsorption Followed by Nanofiltration
- Author
-
Haitang Liu, M. Sarwar Jahan, Huiren Hu, Mir Mojtaba Baktash, and Yonghao Ni
- Subjects
Chromatography ,Renewable Energy, Sustainability and the Environment ,Chemistry ,Bioengineering ,Biomaterials ,Hydrolysis ,Adsorption ,Chemical engineering ,medicine ,Nanofiltration ,Dissolving pulp ,Ion-exchange resin ,Kraft paper ,Activated carbon ,medicine.drug - Published
- 2014
30. Viscosity of Prehydrolysis Liquor of a Hardwood Kraft-Based Dissolving Pulp Production Process
- Author
-
Haitang Liu, Ashwini Nairy, Huiren Hu, Guihua Yang, Yonghao Ni, and M. Sarwar Jahan
- Subjects
Molar mass ,Chemistry ,General Chemical Engineering ,General Chemistry ,Industrial and Manufacturing Engineering ,Solvent ,Viscosity ,chemistry.chemical_compound ,Chemical engineering ,Rheology ,Hardwood ,Organic chemistry ,Lignin ,Dissolving pulp ,Kraft paper - Abstract
In this study, experimental viscosity results of hardwood prehydrolysis liquor (PHL) from the kraft-based dissolving pulp production process were obtained and used to develop empirical models describing the effect of temperature, solid content, the interaction between solute and solvent, and the concentration of lignin and hemicelluloses. The concentration, molar mass, and molecular weight of lignin and polysaccharide of PHL, all are the factors that affect the rheological behavior of the PHL. The results showed that, on the one side, Zaman and Fricke’s model gave better fitting when the viscosity is lower, on the other hand, a much better fitting of the Moosavifar’s model could be obtained by taking interaction between solute and solvent, solids content, concentration of lignin and hemicelluloses into account when the viscosity is higher, because of the interaction between solute lignin/hemicelluloses and solvent water, and the aggregation of lignin with itself, hemicelluloses with itself, and lignin wit...
- Published
- 2013
31. Acid Hydrolysis of Prehydrolysis Liquor Produced from the Kraft-Based Dissolving Pulp Production Process
- Author
-
Guihua Yang, Haitang Liu, M. Sarwar Jahan, and Yonghao Ni
- Subjects
chemistry.chemical_classification ,Chromatography ,Chemistry ,General Chemical Engineering ,Sulfuric acid ,General Chemistry ,Furfural ,Industrial and Manufacturing Engineering ,Acetic acid ,chemistry.chemical_compound ,Hydrolysis ,Monosaccharide ,Acid hydrolysis ,Dissolving pulp ,Kraft paper - Abstract
Acid hydrolysis is an essential step in converting polysaccharides to monosaccharides for the production of fuels and chemicals. The prehydrolysis liquor (PHL) from the kraft-based dissolving pulp production process contains mainly oligosugars with a minor amount of monosugars. In this study, the influence of process conditions, including the sulfuric acid concentration, temperature, and time on the PHL hydrolysis was thoroughly investigated in order to get maximum monosugar concentration with minimal degradation of sugars. The maximum monosugar concentration was obtained at 130 °C for 20 min when the hydrolysis was carried out with 1.78% H2SO4. A high acid concentration (3.33%) increased furfural formation and decreased the monosugar concentration. Acetic acid is generated from the acetyl groups bound to the dissolved hemicelluloses, resulting in a significant increase in the acetic acid concentration in the PHL.
- Published
- 2012
32. Comparison of Dye Behavior from Aspen HYP: Dyes Added in the HYP Manufacturing Process Versus Dyes Added at the Papermaking Wet End
- Author
-
Yonghao Ni, Haitang Liu, and Shuhui Yang
- Subjects
Manufacturing process ,Chemistry ,General Chemical Engineering ,Papermaking ,Pulp (paper) ,Mineralogy ,General Chemistry ,engineering.material ,Pulp and paper industry ,Kraft process ,engineering ,Fine paper ,General Materials Science ,Precipitated calcium carbonate - Abstract
The yellowish color of High Yield Pulp (HYP) gives some psychological obstacles and limits its application in some paper grades. Dyes are widely used in the papermaking process to shade the yellowish color of the paper products. We proposed to add dyes into the HYP manufacturing process to minimize the yellowish hue. In this work, we substituted the dye-added HYP (dyes added in the HYP manufacturing process) for hardwood kraft pulp in the production of fine paper grades, and compared the results from those by adding dyes into the papermaking wet end. A higher dye effectiveness was obtained when we used the dye-added HYP. Also, the dye-added HYP gave more effective performance of Precipitated Calcium Carbonate (PCC) fillers and Optical Brightening Agents (OBA) in terms of CIE whiteness and b*. In addition, the dye-added HYP showed less negative effect on brightness and better compatibility with other dyes. The underlying mechanism for the above experimental observation was proposed.
- Published
- 2010
33. Production of furfural from waste aqueous hemicellulose solution of hardwood over ZSM-5 zeolite
- Author
-
Guang Yu, Haitang Liu, Hongling Gao, Haisong Wang, Yuedong Zhang, Bo Pang, Jian Du, and Xindong Mu
- Subjects
Environmental Engineering ,Industrial Waste ,Bioengineering ,Xylose ,Furfural ,Water Purification ,chemistry.chemical_compound ,Polysaccharides ,Hardwood ,Organic chemistry ,Hemicellulose ,Furaldehyde ,Dissolving pulp ,Waste Management and Disposal ,Aqueous solution ,Renewable Energy, Sustainability and the Environment ,Water ,Green Chemistry Technology ,General Medicine ,Pulp and paper industry ,Wood ,chemistry ,Yield (chemistry) ,Zeolites ,Kraft paper ,Water Pollutants, Chemical - Abstract
This study aimed to produce furfural from waste aqueous hemicellulose solution of a hardwood kraft-based dissolving pulp production processing in a green method. The maximum furfural yield of 82.4% and the xylose conversion of 96.8% were achieved at 463 K, 1.0 g ZSM-5, 1.05 g NaCl and organic solvent-to-aqueous phase ratio of 30:15 (V/V) for 3 h. The furfural yield was just 51.5% when the same concentration of pure xylose solution was used. Under the optimized condition, furfural yield was still up to 67.1% even after the fifth reused of catalyst. Catalyst recycling study showed that ZSM-5 has a certain stability and can be efficiently reused. (C) 2014 Elsevier Ltd. All rights reserved.
- Published
- 2014
34. Comparison of fetal lung maturation in preterm singleton and twin pregnancies
- Author
-
Andreas Roberts, Roberto Romero, Hung N. Winn, John C. Hobbins, and Haitang Liu
- Subjects
Adult ,medicine.medical_specialty ,Twins ,Obstetric Labor, Premature ,Fetal Organ Maturity ,Pregnancy ,medicine ,Humans ,Lung ,Retrospective Studies ,Obstetrics ,business.industry ,Singleton ,Obstetrics and Gynecology ,Gestational age ,Retrospective cohort study ,medicine.disease ,Amniotic Fluid ,Sphingomyelins ,Pediatrics, Perinatology and Child Health ,Phosphatidylcholines ,Population study ,Fetal lung ,Female ,Pregnancy, Multiple ,business ,Premature rupture of membranes - Abstract
Preterm labor or premature rupture of membranes is one of the major complications of twin pregnancies and contributes to the increased maternal and perinatal morbidity and mortality. Forty-seven twin pregnancies and a comparable group of singleton pregnancies constitute the study population. These patients' pregnancies were complicated only by preterm labor. The lecithin to sphingomyelin ratio is used as an index of fetal lung maturation. Analysis of the data reveals that fetal lung maturation is biochemically comparable between twin and singleton pregnancies and among twins for a given gestational age in this clinical setting.
- Published
- 1992
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