The Experts below are selected from a list of 3243 Experts worldwide ranked by ideXlab platform
Tao Chen - One of the best experts on this subject based on the ideXlab platform.
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self assembly of poly ferrocenyldimethylsilane poly Benzyl Ether linear dendritic organometallic polymer
2006Co-Authors: Tao Chen, Li Wang, Guohua Jiang, Jianjun Wang, Xuejie Wang, Junfeng Zhou, Wei WangAbstract:Abstract A kind of linear-dendritic organometallic polymer poly(ferrocenyldimethylsilane)–poly(Benzyl Ether) (PFS–PBE) was synthesized and the self-assembly behaviors of the polymer was studied, which has illuminated the formation of multiple morphologies and, in particular, adjusting the concentration of polymers and adding poly(Benzyl Ether) into self-assembled solution can form different size and morphology. Furthermore, it was found that the aging time of samples could affect self-assembled morphology. The micelle formation mechanisms were also demonstrated.
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electrochemical behavior on poly ferrocenyldimethylsilane b poly Benzyl Ether linear dendritic organometallic polymer films
2006Co-Authors: Tao Chen, Li Wang, Guohua Jiang, Jianjun Wang, Xuejie Wang, Junfeng Zhou, Wei Wang, Jianfeng Wang, Chang Chen, Haoqi GaoAbstract:Abstract The linear-dendritic polymer poly(ferrocenyldimethylsilane)-b-poly(Benzyl Ether) (PFS-PBE) films were prepared and their electrochemical behavior in LiClO 4 aqueous electrolyte solutions was investigated with cyclic voltammetry (CV). Reversible CV processes were obtained for PFS 27 -PBE 1 film and irreversible CV processes were obtained for PFS 20 -PBE 2 film in aqueous electrolyte solutions. The kinetic parameters such as the surface transfer coefficient, the apparent diffusion coefficient, and the standard rate constant for electron transfer, for the two films in aqueous LiClO 4 solutions were measured, and the electrode process mechanism of the films was also discussed.
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synthesis and self assembly of poly Benzyl Ether b poly methyl methacrylate dendritic linear polymers
2005Co-Authors: Guohua Jiang, Li Wang, Tao ChenAbstract:Abstract Here, the dendritic chloric poly(Benzyl Ether) (G 1 -Cl, G 2 -Cl and G 3 -Cl) as the macroinitiator for the controlled atom transfer radical polymerization (ATRP) of methyl methylacrylate was investigated. Polymers obtained were characterizated by GPC, 1 H NMR, FT-IR, TGA and DSC. These dendritic-linear block polymers that consist of linear and dendritic segments have very good solubility in common organic solvents at room temperature. In a selective solvent (THF/H 2 O), polymers can self-assembled into the micelles that have a spherical morphology in shape due to the lowest of the surface energies.
Wei Wang - One of the best experts on this subject based on the ideXlab platform.
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self assembly of poly ferrocenyldimethylsilane poly Benzyl Ether linear dendritic organometallic polymer
2006Co-Authors: Tao Chen, Li Wang, Guohua Jiang, Jianjun Wang, Xuejie Wang, Junfeng Zhou, Wei WangAbstract:Abstract A kind of linear-dendritic organometallic polymer poly(ferrocenyldimethylsilane)–poly(Benzyl Ether) (PFS–PBE) was synthesized and the self-assembly behaviors of the polymer was studied, which has illuminated the formation of multiple morphologies and, in particular, adjusting the concentration of polymers and adding poly(Benzyl Ether) into self-assembled solution can form different size and morphology. Furthermore, it was found that the aging time of samples could affect self-assembled morphology. The micelle formation mechanisms were also demonstrated.
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electrochemical behavior on poly ferrocenyldimethylsilane b poly Benzyl Ether linear dendritic organometallic polymer films
2006Co-Authors: Tao Chen, Li Wang, Guohua Jiang, Jianjun Wang, Xuejie Wang, Junfeng Zhou, Wei Wang, Jianfeng Wang, Chang Chen, Haoqi GaoAbstract:Abstract The linear-dendritic polymer poly(ferrocenyldimethylsilane)-b-poly(Benzyl Ether) (PFS-PBE) films were prepared and their electrochemical behavior in LiClO 4 aqueous electrolyte solutions was investigated with cyclic voltammetry (CV). Reversible CV processes were obtained for PFS 27 -PBE 1 film and irreversible CV processes were obtained for PFS 20 -PBE 2 film in aqueous electrolyte solutions. The kinetic parameters such as the surface transfer coefficient, the apparent diffusion coefficient, and the standard rate constant for electron transfer, for the two films in aqueous LiClO 4 solutions were measured, and the electrode process mechanism of the films was also discussed.
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soft vesicles formed by diblock codendrimers of poly Benzyl Ether and poly methallyl dichloride
2005Co-Authors: Miao Yang, Wei Wang, Fei Yuan, Xiwen Zhang, Fuxia Liang, Britt Minch, Gerhard WegnerAbstract:The synthesis of a block codendrimer (g3-PBE-b-g3-PMDC), composed of a third-generation poly(Benzyl Ether) (PBE) monodendron and an aliphatic polyEther (PMDC) monodendron is reported. In THF/diiospropyl Ether (1:1) the PMDC block functions as a “hydrophilic” block, while the PBE acts as a “hydrophobic” block. The codendrimer can form interdigitated layers leading to vesicle formation. Tapping mode atomic force microscopy (AFM), dynamic light scattering (DLS), and transmission electron microscopy (TEM) were used to characterize the vesicles. The effect of molecular architecture on the formation of the interdigitated layers and vesicles was studied.
Manabu Node - One of the best experts on this subject based on the ideXlab platform.
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a raney nickel sodium hypophosphite combination system for reductive desulfurization without racemization of optically active secondary alcohol
1997Co-Authors: Manabu Node, Kiyoharu Nishide, Yukihiro Shigeta, Kenichi Obata, Hiroaki Shiraki, Hideaki KunishigeAbstract:Abstract Sulfides and sulfoxides bearing an optically active secondary alcohol were desulfurized with a Raney nickel (W-2)-sodium hypophosphite combination system to give optically active alcohols in high yields without racemization . However, the combination system was not effective with sulfides which comprise an alkylthio group and the corresponding sulfoxides. This system exhibited the reductive desulfurization of Benzylthio or phenylthio Ether in the presence of a Benzyl Ether.
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reductive desulfurization using the raney nickel sodium hypophosphite combination system without racemization of a secondary alcohol
1996Co-Authors: Kiyoharu Nishide, Yukihiro Shigeta, Kenichi Obata, T Inoue, Manabu NodeAbstract:Abstract ThioEthers bearing an optically active secondary alcohol were desulfurized with Raney nickel — sodium hypophosphite — acetate buffer system to give optically active alcohols without racemization in high yields. This Raney nickel combination system exhibited a unique desulfurization of Benzylthio or phenylthio group in the presence of Benzyl Ether.
Qinghua Fan - One of the best experts on this subject based on the ideXlab platform.
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from weakness to strength c h π interaction guided self assembly and gelation of poly Benzyl Ether dendrimers
2016Co-Authors: Yi Peng, Yu Feng, Guojun Deng, Qinghua FanAbstract:The C–H/π interactions as the key driving force for the construction of supramolecular gels remain a great challenge because of their weak nature. We hereby employed for the first time weak C–H/π interactions for the construction of supramolecular dendritic gels based on peripherally methyl-functionalized poly(Benzyl Ether) dendrimers. Their gelation property is highly dependent on the nature of the peripheral methyl groups. Furthermore, single-crystal X-ray analysis and NMR spectroscopy revealed that multiple C–H/π interactions between the proton of the methyl group and the electron-rich peripheral methyl-substituted aryl ring played significant roles in the formation of supramolecular nanofibers and organogels. This study uncovers the critical role of weak noncovalent interactions and provides new insights into the further design of self-assembled nanomaterials.
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a pronounced halogen effect on the organogelation properties of peripherally halogen functionalized poly Benzyl Ether dendrons
2016Co-Authors: Yu Feng, Hui Chen, Zhixiong Liu, Qinghua FanAbstract:An interesting halogen-substituent effect on the organogelation properties of poly(Benzyl Ether) dendrons is reported. A new class of poly(Benzyl Ether) dendrons with halo substituents decorating their periphery was synthesized and fully characterized. A systematic study on the gelation abilities, thermotropic behaviors, aggregated microstructures, and mechanical properties of self-assembled organogels was performed to elucidate the halogen-substituent effects on their organogelation propensity. It was found that the exact halogen substitutions on the periphery of dendrons exert a profound effect on the organogelation propensity, and dendrons Gn -Cl (n=2, 3) and G2 -I proved to be highly efficient organogelators. The cooperation of multiple π-π, dispersive halogen, CH-π, and weak C-H⋅⋅⋅X hydrogen-bonding interactions were found to be the key contributor to forming the self-assembled gels. Dendritic organogels formed from Gn -Cl (n=2, 3) in 1,2-dichloroethane exhibited thixotropic-responsive properties, and such thixotropic organogels are promising materials for future research and applications.
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poly Benzyl Ether dendrons without conventional gelation motifs as a new kind of effective organogelators
2012Co-Authors: Yu Feng, Hui Chen, Zhixiong Liu, Liying Wang, Qinghua FanAbstract:Two poly(Benzyl Ether) dendrons, decorated in their periphery with nitrile groups, were divergently synthesized and fully characterized. Their gelation properties were studied by using scanning electron microscopy (SEM), X-ray crystal structure analysis and concentration- and temperature-dependent 1H NMR spectroscopy. It was found that the gelation capability of these dendrons was highly dependent on dendron generation, and the second-generation dendron G2-CN proved to be highly efficient organogelator despite the lacking of any conventional gelation motifs, such as amides, long alkyl side chains and steroidal groups. The multiple strong π-π stacking interactions and hydrogen bonding interactions due to the peripheral isophthalonitrile motifs were proved to be the main driving forces to form the self-assembled gel.
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peripherally dimethyl isophthalate functionalized poly Benzyl Ether dendrons a new kind of unprecedented highly efficient organogelators
2009Co-Authors: Yu Feng, Zitong Liu, Ji Liu, Qiyu Zheng, Qinghua FanAbstract:A series of poly(Benzyl Ether) dendrons, up to the fourth generation, decorated in their periphery with dimethyl esters were divergently synthesized and fully characterized. These dendrons were found to be unprecedented highly efficient organogelators toward various aromatic and polar organic solvents with the critical gelator concentration (CGC) approaching 2.2 mg/mL. The gelation ability was found to be highly dependent on the nature of the peripheral groups, dendron generation, and the dendritic architecture. The large monodisperse dendron G(4) with a globular shape could also form stable gels in several aromatic solvents with relatively high CGCs. A number of experiments (SEM, TEM and AFM imaging, X-ray crystal structure analysis, concentration- and temperature-dependent (1)H NMR spectroscopy, fluorescence spectroscopy, and powder X-ray diffraction) confirmed the self-aggregation of these dendrons, despite the lack of any conventional gelating motifs such as amides, long alkyl side chains, and steroidal groups. The multiple strong pi-pi stacking interactions due to the peripheral dimethyl isophthalate rings and the internal Benzyl rings are found to be the key contributor in forming the self-assembled gel.
Guohua Jiang - One of the best experts on this subject based on the ideXlab platform.
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self assembly of poly ferrocenyldimethylsilane poly Benzyl Ether linear dendritic organometallic polymer
2006Co-Authors: Tao Chen, Li Wang, Guohua Jiang, Jianjun Wang, Xuejie Wang, Junfeng Zhou, Wei WangAbstract:Abstract A kind of linear-dendritic organometallic polymer poly(ferrocenyldimethylsilane)–poly(Benzyl Ether) (PFS–PBE) was synthesized and the self-assembly behaviors of the polymer was studied, which has illuminated the formation of multiple morphologies and, in particular, adjusting the concentration of polymers and adding poly(Benzyl Ether) into self-assembled solution can form different size and morphology. Furthermore, it was found that the aging time of samples could affect self-assembled morphology. The micelle formation mechanisms were also demonstrated.
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electrochemical behavior on poly ferrocenyldimethylsilane b poly Benzyl Ether linear dendritic organometallic polymer films
2006Co-Authors: Tao Chen, Li Wang, Guohua Jiang, Jianjun Wang, Xuejie Wang, Junfeng Zhou, Wei Wang, Jianfeng Wang, Chang Chen, Haoqi GaoAbstract:Abstract The linear-dendritic polymer poly(ferrocenyldimethylsilane)-b-poly(Benzyl Ether) (PFS-PBE) films were prepared and their electrochemical behavior in LiClO 4 aqueous electrolyte solutions was investigated with cyclic voltammetry (CV). Reversible CV processes were obtained for PFS 27 -PBE 1 film and irreversible CV processes were obtained for PFS 20 -PBE 2 film in aqueous electrolyte solutions. The kinetic parameters such as the surface transfer coefficient, the apparent diffusion coefficient, and the standard rate constant for electron transfer, for the two films in aqueous LiClO 4 solutions were measured, and the electrode process mechanism of the films was also discussed.
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synthesis and self assembly of poly Benzyl Ether b poly methyl methacrylate dendritic linear polymers
2005Co-Authors: Guohua Jiang, Li Wang, Tao ChenAbstract:Abstract Here, the dendritic chloric poly(Benzyl Ether) (G 1 -Cl, G 2 -Cl and G 3 -Cl) as the macroinitiator for the controlled atom transfer radical polymerization (ATRP) of methyl methylacrylate was investigated. Polymers obtained were characterizated by GPC, 1 H NMR, FT-IR, TGA and DSC. These dendritic-linear block polymers that consist of linear and dendritic segments have very good solubility in common organic solvents at room temperature. In a selective solvent (THF/H 2 O), polymers can self-assembled into the micelles that have a spherical morphology in shape due to the lowest of the surface energies.