13 results on '"Jun Ren"'
Search Results
2. Fabrication of Yolk-Shell Cu@C Nanocomposites as High-Performance Catalysts in Oxidative Carbonylation of Methanol to Dimethyl Carbonate
- Author
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Juan Wang, Panpan Hao, Ruina Shi, Leilei Yang, Shusen Liu, Jinxian Zhao, Jun Ren, and Zhong Li
- Subjects
Confinement effect ,Cu@C nanocomposites ,Yolk-shell structures ,Oxidative carbonylation ,Dimethyl carbonate ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract A facile way was developed to fabricate yolk-shell composites with tunable Cu cores encapsulated within hollow carbon spheres (Cu@C) with an average diameter about 210 nm and cavity size about 80 nm. During pyrolysis, the confined nanospace of hollow cavity ensures that the nucleation-and-growth process of Cu nanocrystals take place exclusively inside the cavities. The size of Cu cores can be easily tuned from 30 to 55 nm by varying the copper salt concentration. By deliberately creating shell porosity through KOH chemical activation, at an optimized KOH/HCS mass ratio of 1/4, the catalytic performance for the oxidative carbonylation of methanol to dimethyl carbonate (DMC) of the activated sample is enhanced remarkably with TOF up to 8.6 h−1 at methanol conversion of 17.1%. The activated yolk-shell catalyst shows promising catalytic properties involving the reusability with slight loss of catalytic activity and negligible leaching of activated components even after seven recycles, which is beneficial to the implementation of clean production for the eco-friendly chemical DMC thoroughly.
- Published
- 2017
- Full Text
- View/download PDF
3. Controlling Contact Configuration of Carboxylic Acid-Based Molecular Junctions Through Side Group
- Author
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Huang, Jun-Ren, Huang, Hong, Tao, Cai-Ping, Zheng, Ju-Fang, Yuan, Ying, Hong, Ze-Wen, Shao, Yong, Niu, Zhen-Jiang, Chen, Jing-Zhe, and Zhou, Xiao-Shun
- Published
- 2019
- Full Text
- View/download PDF
4. Controlling Contact Configuration of Carboxylic Acid-Based Molecular Junctions Through Side Group
- Author
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Ying Yuan, Cai-Ping Tao, Jun-Ren Huang, Xiao-Shun Zhou, Ju-Fang Zheng, Hong Huang, Ze-Wen Hong, Zhen-Jiang Niu, Yong Shao, and Jing-Zhe Chen
- Subjects
Materials science ,Carboxylic acid ,Nanochemistry ,02 engineering and technology ,010402 general chemistry ,Electrochemistry ,01 natural sciences ,Side-substituted ,lcsh:TA401-492 ,General Materials Science ,Pendant group ,Cu ,chemistry.chemical_classification ,Nano Express ,Contact configuration ,Conductance ,Molecular electronics ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Crystallography ,chemistry ,Scanning tunneling microscopy break junction ,Electrode ,lcsh:Materials of engineering and construction. Mechanics of materials ,0210 nano-technology ,Break junction - Abstract
In this paper, the contact configuration of single molecular junction is controlled through side group, which is explored by electrochemical jump-to-contact STM break junction. The conductance values of 2-methoxy-1,3-benzenedicarboxylic acid (2-M-1,3-BDC) is around 10–3.65 G0, which is different from that of 5-methoxy-1,3-benzenedicarboxylic acid (5-M-1,3-BDC) with 10–3.20 G0. Interestingly, the conductance value of 2-M-1,3-BDC is the same as that of 1,3-benzenedicarboxaldehyde (1,3-BDCA), while single molecular junctions of 5-M-1,3-BDC and 1,3-benzenedicarboxylic acid (1,3-BDC) give out similar conductance value. Since 1,3-BDCA binds to the Cu electrode through one oxygen atom, the dominated contact configuration for 1,3-BDC is through two oxygen atoms. The different conductance values between 2-M-1,3-BDC and 5-M-1,3-BDC can be attributed to the different contact configurations caused by the position of the side group. The current work provides a feasible way to control the contact configuration between the anchoring group and the electrode, which may be useful in designing future molecular electronics.
- Published
- 2019
5. Fabrication of Yolk-Shell Cu@C Nanocomposites as High-Performance Catalysts in Oxidative Carbonylation of Methanol to Dimethyl Carbonate
- Author
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Jinxian Zhao, Ruina Shi, Zhong Li, Jun Ren, Leilei Yang, Shusen Liu, Panpan Hao, and Wang Juan
- Subjects
Cu@C nanocomposites ,Materials science ,Inorganic chemistry ,Yolk-shell structures ,chemistry.chemical_element ,Nanochemistry ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Catalysis ,chemistry.chemical_compound ,lcsh:TA401-492 ,General Materials Science ,Nanocomposite ,Nano Express ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,chemistry ,Dimethyl carbonate ,Oxidative carbonylation ,lcsh:Materials of engineering and construction. Mechanics of materials ,Methanol ,Leaching (metallurgy) ,Confinement effect ,0210 nano-technology ,Carbon ,Pyrolysis - Abstract
A facile way was developed to fabricate yolk-shell composites with tunable Cu cores encapsulated within hollow carbon spheres (Cu@C) with an average diameter about 210 nm and cavity size about 80 nm. During pyrolysis, the confined nanospace of hollow cavity ensures that the nucleation-and-growth process of Cu nanocrystals take place exclusively inside the cavities. The size of Cu cores can be easily tuned from 30 to 55 nm by varying the copper salt concentration. By deliberately creating shell porosity through KOH chemical activation, at an optimized KOH/HCS mass ratio of 1/4, the catalytic performance for the oxidative carbonylation of methanol to dimethyl carbonate (DMC) of the activated sample is enhanced remarkably with TOF up to 8.6 h−1 at methanol conversion of 17.1%. The activated yolk-shell catalyst shows promising catalytic properties involving the reusability with slight loss of catalytic activity and negligible leaching of activated components even after seven recycles, which is beneficial to the implementation of clean production for the eco-friendly chemical DMC thoroughly. Electronic supplementary material The online version of this article (doi:10.1186/s11671-017-2258-7) contains supplementary material, which is available to authorized users.
- Published
- 2017
6. Direct Interaction Between Gold Nanorods and Glucose
- Author
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Jun Ren, Xiangling Ren, Liuqing Yang, and Fangqiong Tang
- Subjects
Absorption (pharmacology) ,Materials science ,Interaction ,UV–vis spectra ,Nanochemistry ,Nanotechnology ,Photochemistry ,Materials Science(all) ,lcsh:TA401-492 ,General Materials Science ,Chemistry/Food Science, general ,Plasmon ,Nano Express ,Material Science ,Engineering, General ,Materials Science, general ,Condensed Matter Physics ,Gold nanospheres ,Gold nanorods ,Physics, General ,Glucose ,High glucose ,Molecular Medicine ,lcsh:Materials of engineering and construction. Mechanics of materials ,Nanorod - Abstract
In this work, we present the results of the study on the interactions between gold nanorods (GNRs) and glucose. The optical properties of GNRs have higher sensitivity to glucose compared with that of gold nanospheres. The long-wavelength bands of the GNRs obviously decrease as the concentration of glucose increases. At high glucose concentrations, the absorption peak in long-wavelength bands almost disappears, and the absorption intensities corresponding to the transverse plasmon band are also decrease. These results suggest that glucose could seriously affect the optical properties of GNRs. A possible interaction mechanism between gold nanorods (GNRs) and glucose has been proposed. Furthermore, the influence of glucose on different amount GNRs also has been studied.
- Published
- 2010
7. Synthesis and Application of Carbon-Iron Oxide Microspheres' Black Pigments in Electrophoretic Displays
- Author
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Xianwei Meng, Shiwei Sun, Ting Wen, Fangqiong Tang, Jun Ren, and Rongbo Zheng
- Subjects
Iron oxide ,Oxide ,chemistry.chemical_element ,Chloride ,Ferrous ,chemistry.chemical_compound ,Materials Science(all) ,medicine ,Nanotechnology ,General Materials Science ,E-paper ,Chemistry/Food Science, general ,Aqueous solution ,Nano Express ,Material Science ,Engineering, General ,Materials Science, general ,Condensed Matter Physics ,Carbon ,Solvent ,Electrophoresis ,Physics, General ,chemistry ,Chemical engineering ,Pigment ,Black ,Molecular Medicine ,medicine.drug - Abstract
Carbon–iron oxide microspheres’ black pigments (CIOMBs) had been prepared via ultrasonic spray pyrolysis of aqueous solutions containing ferrous chloride and glucose. Due to the presence of carbon, CIOMBs not only exhibited remarkably acid resistance, but also could be well dispersed in both polar solvents and nonpolar solvent. Finally, dispersions of hollow CIOMBs in tetrachloroethylene had successfully been applied in electrophoretic displays.
- Published
- 2010
8. Synthesis of Aqueous CdTe/CdS/ZnS Core/shell/shell Quantum Dots by a Chemical Aerosol Flow Method
- Author
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Fangqiong Tang, Xianwei Meng, Xinglu Huang, Dong Chen, Jun Ren, Linlin Li, Hongbo Li, and Chuanmiao Yan
- Subjects
Materials science ,Photoluminescence ,Core–shell ,Shell (structure) ,Analytical chemistry ,Quantum yield ,Nanochemistry ,CdTe/CdS/ZnS ,Rhodamine 6G ,chemistry.chemical_compound ,Materials Science(all) ,lcsh:TA401-492 ,Nanotechnology ,General Materials Science ,High-resolution transmission electron microscopy ,Chemistry/Food Science, general ,Nano Express ,Material Science ,Engineering, General ,Quantum dot ,Materials Science, general ,Condensed Matter Physics ,Crystallography ,Physics, General ,chemistry ,Chemical aerosol flow ,Transmission electron microscopy ,Molecular Medicine ,lcsh:Materials of engineering and construction. Mechanics of materials ,Aqueous - Abstract
This work described a continuous method to synthesize CdTe/CdS/ZnS core/shell/shell quantum dots. In an integrated system by flawlessly combining the chemical aerosol flow system working at high temperature (200–300°C) to generate CdTe/CdS intermediate products and an additional heat-up setup at relatively low temperature to overcoat the ZnS shells, the CdTe/CdS/ZnS multishell structures were realized. The as-synthesized CdTe/CdS/ZnS core/shell/shell quantum dots are characterized by photoluminescence spectra, X-ray diffraction (XRD), energy-dispersive X-ray spectra (EDS), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Fluorescence and XRD results confirm that the obtained quantum dots have a core/shell/shell structure. It shows the highest quantum yield above 45% when compared to the rhodamine 6G. The core/shell/shell QDs were more stable via the oxidation experiment by H2O2.
- Published
- 2009
9. Monodisperse Hollow Tricolor Pigment Particles for Electronic Paper
- Author
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Xianwei Meng, Fangqiong Tang, Bo Peng, and Jun Ren
- Subjects
Materials science ,Metal ions in aqueous solution ,Dispersity ,Mixing (process engineering) ,Nanoparticle ,Nanochemistry ,Nanotechnology ,law.invention ,Pigment ,Bistable ,Materials Science(all) ,law ,lcsh:TA401-492 ,General Materials Science ,Calcination ,E-paper ,Hollow ,Chemistry/Food Science, general ,Nano Express ,Material Science ,Engineering, General ,Doping ,Materials Science, general ,Condensed Matter Physics ,Physics, General ,Chemical engineering ,visual_art ,visual_art.visual_art_medium ,Molecular Medicine ,lcsh:Materials of engineering and construction. Mechanics of materials - Abstract
A general approach has been designed to blue, green, and red pigments by metal ions doping hollow TiO 2. The reaction involves initial formation of PS at TiO2 core–shell nanoparticles via a mixed-solvent method, and then mixing with metal ions solution containing PEG, followed calcining in the atmosphere. The as-prepared hollow pigments exhibit uniform size, bright color, and tunable density, which are fit for electronic paper display.
- Published
- 2009
10. Monodisperse Hollow Tricolor Pigment Particles for Electronic Paper.
- Author
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Xianwei Meng, Fangqiong Tang, Bo Peng, and Jun Ren
- Subjects
NANOPARTICLES ,NANOELECTRONICS ,METAL ions ,NANOSTRUCTURED materials ,NANOCRYSTALS ,ELECTRONIC paper - Abstract
A general approach has been designed to blue, green, and red pigments by metal ions doping hollow TiO
2 . The reaction involves initial formation of PS at TiO2 core–shell nanoparticles via a mixed-solvent method, and then mixing with metal ions solution containing PEG, followed calcining in the atmosphere. The as-prepared hollow pigments exhibit uniform size, bright color, and tunable density, which are fit for electronic paper display. [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
11. Synthesis of Aqueous CdTe/CdS/ZnS Core/shell/shell Quantum Dots by a Chemical Aerosol Flow Method.
- Author
-
Chuanmiao Yan, Fangqiong Tang, Linlin Li, Hongbo Li, Xinglu Huang, Dong Chen, Xianwei Meng, and Jun Ren
- Subjects
QUANTUM dots ,AEROSOLS ,HIGH temperatures ,LOW temperatures ,CADMIUM ,TELLURIUM ,ZINC - Abstract
This work described a continuous method to synthesize CdTe/CdS/ZnS core/shell/shell quantum dots. In an integrated system by flawlessly combining the chemical aerosol flow system working at high temperature (200–300°C) to generate CdTe/CdS intermediate products and an additional heat-up setup at relatively low temperature to overcoat the ZnS shells, the CdTe/CdS/ZnS multishell structures were realized. The as-synthesized CdTe/CdS/ZnS core/shell/shell quantum dots are characterized by photoluminescence spectra, X-ray diffraction (XRD), energy-dispersive X-ray spectra (EDS), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Fluorescence and XRD results confirm that the obtained quantum dots have a core/shell/shell structure. It shows the highest quantum yield above 45% when compared to the rhodamine 6G. The core/shell/shell QDs were more stable via the oxidation experiment by H
2 O2 . [ABSTRACT FROM AUTHOR]- Published
- 2010
- Full Text
- View/download PDF
12. Self-Assembled Polymeric Micellar Nanoparticles as Nanocarriers for Poorly Soluble Anticancer Drug Ethaselen
- Author
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Kewei Yang, Yan Liu, Yanxia Zhou, Fei Wang, Xingwei Chen, Xinru Li, Yang Zhuoli, Yanhui Zhang, and Li-Jun Ren
- Subjects
Materials science ,Nanoparticle ,Nanotechnology ,macromolecular substances ,Micelle ,Hemolysis ,Monomethoxy poly(ethylene glycol)-poly(lactide) ,chemistry.chemical_compound ,Materials Science(all) ,Copolymer ,lcsh:TA401-492 ,Distribution (pharmacology) ,General Materials Science ,Solubility ,Lactide ,Nano Express ,technology, industry, and agriculture ,Condensed Matter Physics ,Ethaselen ,chemistry ,Antitumor efficacy ,Polymeric micelles ,lcsh:Materials of engineering and construction. Mechanics of materials ,Nanocarriers ,Ethylene glycol ,Nuclear chemistry - Abstract
A series of monomethoxy poly(ethylene glycol)-poly(lactide) (mPEG-PLA) diblock copolymers were synthesized, and mPEG-PLA micelle was fabricated and used as a nanocarrier for solubilization and delivery of a promising anticancer drug ethaselen. Ethaselen was efficiently encapsulated into the micelles by the dialysis method, and the solubility of ethaselen in water was remarkably increased up to 82 μg/mL before freeze-drying. The mean diameter of ethaselen-loaded micelles ranged from 51 to 98 nm with a narrow size distribution and depended on the length of PLA block. In vitro hemolysis study indicated that mPEG-PLA copolymers and ethaselen-loaded polymeric micelles had no hemolytic effect on the erythrocyte. The enhanced antitumor efficacy and reduced toxic effect of ethaselen-loaded polymeric micelle when compared with ethaselen-HP-β-CD inclusion were observed at the same dose in H22human liver cancer cell bearing mouse models. These suggested that mPEG-PLA polymeric micelle nanoparticles had great potential as nanocarriers for effective solubilization of poorly soluble ethaselen and further reducing side effects and toxicities of the drug.
- Full Text
- View/download PDF
13. Controlling Contact Configuration of Carboxylic Acid-Based Molecular Junctions Through Side Group
- Author
-
Jun-Ren Huang, Hong Huang, Cai-Ping Tao, Ju-Fang Zheng, Ying Yuan, Ze-Wen Hong, Yong Shao, Zhen-Jiang Niu, Jing-Zhe Chen, and Xiao-Shun Zhou
- Subjects
Carboxylic acid ,Cu ,Scanning tunneling microscopy break junction ,Contact configuration ,Side-substituted ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
Abstract In this paper, the contact configuration of single molecular junction is controlled through side group, which is explored by electrochemical jump-to-contact STM break junction. The conductance values of 2-methoxy-1,3-benzenedicarboxylic acid (2-M-1,3-BDC) is around 10–3.65 G0, which is different from that of 5-methoxy-1,3-benzenedicarboxylic acid (5-M-1,3-BDC) with 10–3.20 G0. Interestingly, the conductance value of 2-M-1,3-BDC is the same as that of 1,3-benzenedicarboxaldehyde (1,3-BDCA), while single molecular junctions of 5-M-1,3-BDC and 1,3-benzenedicarboxylic acid (1,3-BDC) give out similar conductance value. Since 1,3-BDCA binds to the Cu electrode through one oxygen atom, the dominated contact configuration for 1,3-BDC is through two oxygen atoms. The different conductance values between 2-M-1,3-BDC and 5-M-1,3-BDC can be attributed to the different contact configurations caused by the position of the side group. The current work provides a feasible way to control the contact configuration between the anchoring group and the electrode, which may be useful in designing future molecular electronics.
- Published
- 2019
- Full Text
- View/download PDF
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