11 results on '"Ma, Jian‐Gong"'
Search Results
2. Metal-Organic Framework Anchored with a Lewis Pair as a New Paradigm for Catalysis
- Author
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Niu, Zheng, Bhagya Gunatilleke, Wilarachchige D.C., Sun, Qi, Lan, Pui Ching, Perman, Jason, Ma, Jian-Gong, Cheng, Yuchuan, Aguila, Briana, and Ma, Shengqian
- Published
- 2018
- Full Text
- View/download PDF
3. Ultrastable Cu‐Based Dual‐Channel Heterowire for the Switchable Electro‐/Photocatalytic Reduction of CO2.
- Author
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Li, Bo, Liu, Xiao, Lei, Bin, Luo, Haiqiang, Liu, Xize, Liu, Hengzhi, Gu, Qinfen, Ma, Jian‐Gong, and Cheng, Peng
- Subjects
COPPER ,METAL-organic frameworks ,HETEROJUNCTIONS ,ELECTROLYTIC reduction ,RENEWABLE energy sources ,CARBON dioxide ,NANOWIRES ,PHOTOREDUCTION - Abstract
Catalytic conversion of CO2 into high value‐added chemicals using renewable energy is an attractive strategy for the management of CO2. However, achieving both efficiency and product selectivity remains a great challenge. Herein, a brand‐new family of 1D dual‐channel heterowires, Cu NWs@MOFs are constructed by coating metal–organic frameworks (MOFs) on Cu nanowires (Cu NWs) for electro‐/photocatalytic CO2 reductions, where Cu NWs act as an electron channel to directionally transmit electrons, and the MOF cover acts as a molecule/photon channel to control the products and/or undertake photoelectric conversion. Through changing the type of MOF cover, the 1D heterowire is switched between electrocatalyst and photocatalyst for the reduction of CO2 with excellent selectivity, adjustable products, and the highest stability among the Cu‐based CO2RR catalysts, which leads to heterometallic MOF covered 1D composite, and especially the first 1D/1D‐type Mott–Schottky heterojunction. Considering the diversity of MOF materials, the ultrastable heterowires offer a highly promising and feasible solution for CO2 reduction. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
4. Protocol to modify the surface of nano-Cu2O using facet controlling and MOF shell coating
- Author
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Luo, Haiqiang, Li, Bo, Ma, Jian-Gong, and Cheng, Peng
- Published
- 2022
- Full Text
- View/download PDF
5. Basilar Artery Tortuosity Is Associated With White Matter Hyperintensities by TIMP-1.
- Author
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Zhang, Dao Pei, Peng, Yan Fang, Zhang, Huai Liang, Ma, Jian Gong, Zhao, Min, Yin, Suo, and Wei, Tian Tian
- Subjects
BASILAR artery ,TORTUOSITY ,MAGNETIC resonance angiography ,MATRIX metalloproteinases ,VERTEBRAL artery - Abstract
Background and Purpose: To test the hypothesis that the imbalance between matrix metalloproteinases (MMPs) and tissue inhibitor of metalloproteinases (TIMPs) may play a potential role in bridging vertebrobasilar dolichoectasia (VBD) with lacunar infarction (LI) and white matter hyperintensities (WMH). Methods: We studied 212 patients with vertigo who underwent multimodal magnetic resonance imaging (MRI) tests for VBD, LI, and WMH identification. We investigated biomarkers of VBD with magnetic resonance angiography (MRA) via various physical characteristics of the vertebrobasilar arteries (VBAs). Similarly, LI and WMH biomarkers were extracted using T2-weighted and fluid attenuated inversion recovery (FLAIR) images. We first determined which of these neuroimaging markers were significant identifiers of VBD, LI and the different grades of WMH. We then sought to draw potential mechanistic conclusions from these MRI-derived parameters, by associating the aforementioned biomarkers with MMP and TIMP serum levels in patient blood samples using non-parametric statistical tests. Results: MMP-9 serum level was significantly higher in vertigo patients with VBAs dilation and basilar artery (BA) elongation compared to those with healthy arterial size, and the ratio of MMP-9/TIMP-1 level were higher in those patients. TIMP-1 level was also markedly higher in vertigo patients with BA tortuosity than those without BA tortuosity. The bending length (BL) of the BA was positively correlated with TIMP-1. The length, BL, and tortuosity index of the BA, as well as serum levels of TIMP-1 were greater in patients with higher WMH grades compared to those with low WMH grades. The vertebral artery and BA diameters, and the levels of MMP-2, -3, -9, TIMP-2 and cathepsin L were similar in patients with different WMH grades. Conclusion: In vertigo patients, we found various probably associations between MMP-9 and TIMP-1 with arterial alterations linked to both VBD and WMH that may help with the diagnosis and treatment of such diseases in the future. [ABSTRACT FROM AUTHOR]
- Published
- 2019
- Full Text
- View/download PDF
6. Solvent-assisted coordination driven assembly of a supramolecular architecture featuring two types of connectivity from discrete nanocages.
- Author
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Niu, Zheng, Wang, Lei, Fang, Sheng, Lan, Pui Ching, Aguila, Briana, Perman, Jason, Ma, Jian-Gong, Cheng, Peng, Li, Xiaopeng, and Ma, Shengqian
- Published
- 2019
- Full Text
- View/download PDF
7. Triply-Bonded Dimolybdenum(III) Hexaalkoxides Towards Model Catalysts
- Author
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Ma, Jian-Gong, Driess, Matthias, and Technische Universität Berlin, Fakultät II - Mathematik und Naturwissenschaften
- Subjects
Modelkatalyse ,Molybdenum ,Heterometallic cluster ,540 Chemie und zugeordnete Wissenschaften ,Model catalyst ,Molybdän ,ddc:540 ,Heterometallischer Cluster ,Triply-bond ,Dreifachbindung - Abstract
Homo- und Heteroleptische Derivate von dreifach gebundenen Dimolybdänalkoxiden wurden synthetisiert und in der Synthese neuartiger, zweikerniger Molybdänkomplexe in verschiedenen Oxidationsstufen, sowie für die Darstellung von heterometallischen Clustern verwendet. Ausgehend von den erhaltenen, dreifachgebundenen Vorstufen Mo2(ONe)6 und Mo2(OtBu)2(ONe)4 (Ne = neopentyl) konnten durch selektive Oxidation, einfachgebundene Systeme in der Oxidationsstufe +5 erhalten werden, die je nach Art des Startmaterials entweder eine Mo=O Einheit oder eine verbrückende Mo-O-Mo Einheit enthalten. Erste katalytische Messungen zeigen eine unterschiedliche Reaktivität der Komplexe als Katalysatorvorstufen, welches Rückschlüsse auf mechanistische Aspekte in molybdänbasierenden Oxidationsreaktionen erlauben. Des Weiteren konnte durch Umsetzung der homoleptischen Startmaterialien Mo2(OR)6 die Synthese ungewöhnlicher, heterobimetallischer Cluster der Formel [Mo2(MeZn)6(μ2-Me)(μ3-CH2)2(OR)7] (R = Ne and cHex) und [Mo2(MeZn)6(μ2-CH2)(μ3-CH2)2(OR)6] (R = cHex) erreicht werden, die ideale Modellsysteme für Mo@ZnO Materialien sind und zeigen, dass die Dimolybdändreifachbindung sich zur C-H Bindungsaktivierung eignet. Auch die Umsetzung mit nBuLi liefert einen heterobimetallischen Cluster Li4Mo2nBu8, jedoch unter gleichzeitiger Reduktion zur Dimolybdänvierfachbindung, der ebenfalls als Modellsystem zur Untersuchung gemischter Molybdän-Lithium Materialen dienen kann. Die erhaltenen Ergebnisse zeigen, dass die synthetisierten Ausgangskomplexe exzellente Startmaterialen zur Synthese von molekularen Modellsystemen zur Simulation von MoOx-basierenden Systemen sind und somit Einsicht in molybdänbasierende, katalytische Transformation geben können., Homo- and heteroleptic derivatives of triply-bonded dimolybdenum alkoxides were synthesized and used for the synthesis of novel dimolybdenum complexes in different oxidation states, as well as for the representation of heterometallic clusters. Starting from triply-bonded dimolybdenum(III) compounds, Mo2(ONe)6 and Mo2(OtBu)2(ONe)4 (Ne = neopentyl), singly-bonded dimolybdenum(V) complexes can be obtained containing either a Mo=O or a bridged Mo−O−Mo unit. Preliminary catalytic measurements show a different reactivity of these complexes as precatalysts, which allows first conclusions on mechanistic aspects in molybdenum-based oxidation reactions. Moreover, starting from homoleptic compounds, Mo2(OR)6, unusual heterobimetallic clusters with the formula [Mo2(MeZn)6(μ2-Me)(μ3-CH2)2(OR)7] (R = Ne and cHex) and [Mo2(MeZn)6(μ2-CH2)(μ3-CH2)2(OR)6] (R = cHex) can be synthesized, which could be ideal model systems for Mo@ZnO materials and show the activity of dimolybdenum triple-bond towards C−H bond activation. The reaction of Mo2(OR)6 with nBuLi leads to a heterobimetallic cluster Li4Mo2nBu8 with the reduction of dimolybdenum triple-bond to the quadruple-bond, which could serve as model system for Mo-Li materials. The obtained results show that triply-bonded dimolybdenum alkoxides are excellent starting materials for the synthesis of molecular models towards the simulation and mechanistic investigation of MoOx-based systems.
- Published
- 2011
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8. Ultrastable Cu‐Based Dual‐Channel Heterowire for the Switchable Electro‐/Photocatalytic Reduction of CO2.
- Author
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Li, Bo, Liu, Xiao, Lei, Bin, Luo, Haiqiang, Liu, Xize, Liu, Hengzhi, Gu, Qinfen, Ma, Jian‐Gong, and Cheng, Peng
- Subjects
- *
COPPER , *METAL-organic frameworks , *HETEROJUNCTIONS , *ELECTROLYTIC reduction , *RENEWABLE energy sources , *CARBON dioxide , *NANOWIRES , *PHOTOREDUCTION - Abstract
Catalytic conversion of CO2 into high value‐added chemicals using renewable energy is an attractive strategy for the management of CO2. However, achieving both efficiency and product selectivity remains a great challenge. Herein, a brand‐new family of 1D dual‐channel heterowires, Cu NWs@MOFs are constructed by coating metal–organic frameworks (MOFs) on Cu nanowires (Cu NWs) for electro‐/photocatalytic CO2 reductions, where Cu NWs act as an electron channel to directionally transmit electrons, and the MOF cover acts as a molecule/photon channel to control the products and/or undertake photoelectric conversion. Through changing the type of MOF cover, the 1D heterowire is switched between electrocatalyst and photocatalyst for the reduction of CO2 with excellent selectivity, adjustable products, and the highest stability among the Cu‐based CO2RR catalysts, which leads to heterometallic MOF covered 1D composite, and especially the first 1D/1D‐type Mott–Schottky heterojunction. Considering the diversity of MOF materials, the ultrastable heterowires offer a highly promising and feasible solution for CO2 reduction. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
9. Ultrastable Cu-Based Dual-Channel Heterowire for the Switchable Electro-/Photocatalytic Reduction of CO 2 .
- Author
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Li B, Liu X, Lei B, Luo H, Liu X, Liu H, Gu Q, Ma JG, and Cheng P
- Abstract
Catalytic conversion of CO
2 into high value-added chemicals using renewable energy is an attractive strategy for the management of CO2 . However, achieving both efficiency and product selectivity remains a great challenge. Herein, a brand-new family of 1D dual-channel heterowires, Cu NWs@MOFs are constructed by coating metal-organic frameworks (MOFs) on Cu nanowires (Cu NWs) for electro-/photocatalytic CO2 reductions, where Cu NWs act as an electron channel to directionally transmit electrons, and the MOF cover acts as a molecule/photon channel to control the products and/or undertake photoelectric conversion. Through changing the type of MOF cover, the 1D heterowire is switched between electrocatalyst and photocatalyst for the reduction of CO2 with excellent selectivity, adjustable products, and the highest stability among the Cu-based CO2 RR catalysts, which leads to heterometallic MOF covered 1D composite, and especially the first 1D/1D-type Mott-Schottky heterojunction. Considering the diversity of MOF materials, the ultrastable heterowires offer a highly promising and feasible solution for CO2 reduction., (© 2023 The Authors. Advanced Science published by Wiley-VCH GmbH.)- Published
- 2023
- Full Text
- View/download PDF
10. Pseudocapsule and pseudocapsule-based extracapsular resection in pituitary neuroendocrine tumors.
- Author
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Wang XB, Han TY, Ma JG, He C, Xue L, Zhang X, and Wu ZB
- Subjects
- Humans, Pituitary Gland, Neurosecretory Systems, Neuroendocrine Tumors surgery, Pituitary Diseases, Pituitary Neoplasms surgery
- Abstract
Since Costello et al. proposed the concept of pseudocapsule of pituitary neuroendocrine tumors (PitNETs) in 1936, many studies have been published on its occurrence, development process, histopathology, and morphology. Pseudocapsule has been proposed as the anatomical interface between PitNETs and normal pituitary gland, therefore the so-called pseudocapsule-based extracapsular resection (ER) technique was developed as an extracapsular surgery method for PitNETs,which differs from the conventional intracapsular resection (IR). In recent years, ER has also been widely used in patients of different tumor types, sizes, and age groups, because the pseudocapsule can be identified more clearly under the endoscopy. Endoscopic transsphenoidal resection for PitNETs has become the preferred surgical method. We reviewed relevant literatures in the past 10 years, showing that ER could achieve better rate of gross total resection (GTR) and biochemical remission, and reduce tumor recurrence than IR, without increasing postoperative complications. Therefore, the pseudocapsule and ER should be valued by neurosurgeons and actively promoted clinically., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Wang, Han, Ma, He, Xue, Zhang and Wu.)
- Published
- 2022
- Full Text
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11. Toward Green Production of Chewing Gum and Diet: Complete Hydrogenation of Xylose to Xylitol over Ruthenium Composite Catalysts under Mild Conditions.
- Author
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Liu CJ, Zhu NN, Ma JG, and Cheng P
- Abstract
Xylitol is one of the most famous chemicals known to people as the essential ingredient of chewing gum and as the sugar alternative for diabetics. Catalytic hydrogenation of biomass-derived xylose with H
2 to produce high-value xylitol has been carried out under harsh reaction conditions. Herein, we exhibit the combination of Ru NPs with an environmentally benign MOF (ZIF-67) to afford a heterogeneous composite catalyst. Complete conversion of xylose with 100% selectivity to xylitol was achieved at 50°C and 1 atm H2 . This is the first successful attempt to produce xylitol with ambient pressure H2 as well as the first time to achieve a 100% selectivity of xylitol for applicable catalysts. We also proved the universality of the Ru@ZIF-67 towards other hydrogenation processes. Under 1 atm H2 , we achieved 100% conversion and >99% selectivity of 1-phenylethanol at 50°C for the hydrogenation of acetophenone. This is also the first report of hydrogenating acetophenone to 1-phenylethanol under 1 atm H2 , which confirms that our result not only contributes to enhance the industrial yields of xylitol and reduces both the economical and energy costs but also provides new perspectives on the other hydrogenation process with H2 ., Competing Interests: The authors declare no competing financial interest., (Copyright © 2019 Cai-Juan Liu et al.)- Published
- 2019
- Full Text
- View/download PDF
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