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Zhang Y.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | Zhou Y.,Nanjing Southeast University | Shi J.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | Zhou S.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | And 3 more authors.
Fuel Processing Technology | Year: 2013

La-doped mesoporous alumina (La-Al) with different content of La was synthesized and then this kind of material was used as the support for platinum-tin catalyst in propane dehydrogenation. It was found that a portion of La had been incorporated into the alumina framework with La-doping. When the content of La in the support was suitable, both the catalyst acidity and the coke amount were decreased. Moreover, in these cases, the presence of La could not only promote the distribution of metallic particles, but also strengthen the interaction between tin species and support. As a result, more amounts of tin could exist in oxidized states, which was beneficial to enhance the interaction of Pt with SnOx species and the reaction activity. In the current study, the PtSnNa/La-Al catalyst with 1.0 wt.% La exhibited the best catalytic activity and stability. Compared with pure Al2O3 support, this La-doped Al2O3 support was also favorable for the improvement of the catalytic performance even at higher reaction temperature (605 C). However, with the excessive addition of La, the agglomerations of metallic particles and the increase in percentage of metallic tin (Sn 0) on the catalyst were found, which seriously resulted in the deactivation of catalyst. © 2013 Elsevier B.V. Source


He M.,University of New Brunswick | He M.,Nanjing Southeast University | He M.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | Xiao H.,University of New Brunswick | And 3 more authors.
Journal of Materials Chemistry B | Year: 2015

A series of novel water-soluble amphiphilic copolymers containing ciprofloxacin (CPF) and quaternary ammonium salts were prepared by the free-radical copolymerization of methacrylate monomers with CPF, quaternary ammonium salt (QAS) monomers and butyl acrylate (BA). The copolymers were characterized by 1H-NMR, charge density and UV measurements. The antimicrobial activities of the copolymers, based on the minimum inhibition concentration (MIC) against Escherichia coli (E. coli), varied with hydrophobic BA content in the copolymers. The incorporation of the antimicrobial moiety ciprofloxacin further enhanced the antibacterial activities of the copolymers, reducing the MIC to 4.0 ppm. The UV260 absorption measurements were applied to reveal the dynamic antimicrobial process of the copolymers. The results of inhibition zones and shaking flask methods of antimicrobial-modified fibers showed that the copolymers had excellent antimicrobial activities when applied to cellulose fibers. In the presence of 2 wt% (based on oven-dried fibers) of the copolymer, the growth inhibition reached 100%. This journal is © The Royal Society of Chemistry 2015. Source


Wang Y.-Q.,Nanjing Southeast University | Wang Y.-Q.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | Gao X.-L.,Nanjing Southeast University | Song B.,Nanjing Southeast University | And 3 more authors.
Chinese Chemical Letters | Year: 2014

The MWCNT-TiO2 hybrid materials were prepared by a simply mixing method and used as a counter electrode (CE) for dye-sensitized solar cells. Compared with the platinum CE, MWCNT-TiO2 CE has the similar redox voltage and current response in the cyclic voltammetry. The electrochemical catalytic activity was characterized by the electrochemical impedance spectroscopy and Tafel curve, including the equivalent circuit, the exchange current density, the limiting diffusion current density, and the diffusion coefficient of triiodide/iodide redox species. The results indicate that the reduction process from triiodide to iodide is determined by the kinetic-controlled and diffusion-limited processes. The device performance is optimal based on the MWCNT-TiO2 (mass ratio of 2:1) CE, such as the open-circuit voltage of 0.72 V, the short-circuit photocurrent density of 15.71 mA/cm2, the fill factor of 0.68, and the photon-to-electron conversion efficiency of 7.69%. © 2014 Yu-Qiao Wang and Yue-Ming Sun. Source


Liu Y.,Nanjing Southeast University | Zhou Y.,Nanjing Southeast University | Zhou Y.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | Yao Q.,Nanjing Southeast University | And 2 more authors.
Desalination and Water Treatment | Year: 2015

Abstract: In this paper, a new double hydrophilic and environment-friendly polyether copolymer inhibitor, polyethylene glycol double-ester of maleic anhydride—acrylic acid (PEGDMA-AA), was synthesized to inhibit the precipitation of calcium carbonate and Fe(III) scales. Structures of PEG, PEGDMA, and PEGDMA-AA were characterized by Fourier transform infrared spectrometer (FTIR) and 1H Nuclear Magnetic Resonance (1HNMR). The influence of PEGDMA-AA dosage and mass ratio (PEGDMA: AA) toward CaCO3 and Fe scale were tested through static jar scale inhibition and dispersion tests. The optimal mass ratio (PEGDMA: AA) was 1:1 for calcium carbonate inhibition and 1:2 for dispersing Fe(III), respectively. Investigation of influence of solution properties on CaCO3 inhibition was also carried out and dispersion ability for Fe(III) was compared with commercial inhibitors. The effect of PEGDMA-AA on the morphology, size, and crystal form of CaCO3 particles were examined through scanning electron microscopic, transmission electron microscope, X-ray powder diffraction, and FTIR. One supposed mechanism (core–shell structure) was also described in detail. © 2014 Balaban Desalination Publications. All rights reserved. Source


He M.,Nanjing Southeast University | He M.,University of New Brunswick | He M.,Jiangsu Optoelectronic Functional Materials and Engineering Laboratory | Zhou Y.,Nanjing Southeast University | And 3 more authors.
New Journal of Chemistry | Year: 2016

Novel water-soluble amphiphilic copolymers with ciprofloxacin (CPF) and primary amine salt were prepared by the copolymerization of methacrylate monomer containing CPF with protonated primary amine monomer and methyl acrylate (MA). The chemical structure and composition of amphiphilic copolymers were characterized by 1H-NMR, charge density and UV measurements. The antimicrobial activities were evaluated by determining the minimal inhibitory concentration (MIC) against Gram-negative bacterium Escherichia coli (E. coli). The results showed that the hydrophobic MA monomer played an important role in the antibacterial action and the incorporation of ciprofloxacin further enhanced antimicrobial activities of the copolymers. All the copolymers showed excellent antibacterial activities with the MIC values in the range of 5-40 ppm. UV absorption measurements were employed for quantifying the amount of intracellular components leaked into bacterial suspension and revealing the dynamic antimicrobial process of antimicrobial copolymers. The confocal laser scanning microscopy (CLSM) technique was used to assay the viability of bacteria in the presence of antimicrobial copolymers by staining bacteria with specific fluorescent dyes. The results of the shaking flask method of antimicrobial-modified cellulose fibers showed that the copolymers applied to the fibers exhibited excellent antimicrobial activities with complete growth inhibition against E. coli in the presence of 2 wt% (based on oven-dried fibers) of copolymer in the fiber. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2016. Source

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