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Ning C.,Changshu Institute of Technology | Ning C.,Jiangsu Laboratory of Advanced Functional Materials | Chen Z.,Changshu Institute of Technology | Qiu Y.,Changshu Institute of Technology | Wu J.,Changshu Institute of Technology
Shiyou Huagong/Petrochemical Technology | Year: 2012

Dendritic poly (amine-ester) (PAE (NH 2) 8)-lauric acid was prepared by electrostatic force self-assembling and was characterized by means of FTIR. The effects of lauric acid dosage, PAE (NH 2) 8 mole concentration and aqueous phase pH on the phase-transfer rates of dyes(namely methyl orange, titan yellow and xylenol orange)were investigated. The results showed that the phase-transfer rates of the dyes increased firstly and then decreased with increasing lauric acid dosage and aqueous phase pH, and increased with increasing PAE (NH 2) 8 dosage. In the mixture of 20 mL lauric acid toluene solution with 9.09% (w) lauric acid, 10 mL PAE (NH 2) 8 aqueous solution with 4.2×10 -4 mol/L PAE (NH 2) 8 and 10 mL dye (methyl orange, titan yellow or xylenol orange) aqueous solution with about 1.200×10 -5 mol/L dye, when aqueous phase pH were 7.72, 6.64 and 7.72, the phase-transfer rates of titan yellow, methyl orange and xylenol orange reached the maximum value of 40.06%, 47.09% and 33.70%, respectively.

Chen A.-B.,Soochow University of China | Wang X.-F.,Soochow University of China | Vasilopoulos P.,Concordia University at Montreal | Zhai M.-X.,Soochow University of China | Liu Y.-S.,Jiangsu Laboratory of Advanced Functional Materials
Physical Chemistry Chemical Physics | Year: 2014

The electronic structure and conductance of substitutionally edge-doped zigzag silicene nanoribbons (ZSiNRs) are investigated using the nonequilibrium Green's function method combined with the density functional theory. Two-probe systems of ZSiNRs in both ferromagnetic and antiferromagnetic states are considered. Doping effects of elements from groups III and V, in a parallel or antiparallel magnetic configuration of the two electrodes, are discussed. By switching on and off the external magnetic field, we may convert the metallic ferromagnetic ZSiNRs into insulating antiferromagnetic ZSiNRs. In the ferromagnetic state, even- or odd-width ZSiNRs exhibit a drastically different magnetoresistance. In an odd-width edge-doped ZSiNR a large magnetoresistance occurs compared to that in a pristine ZSiNR. The situation is reversed in even-width ZSiNRs. These phenomena result from the drastic change in the conductance in the antiparallel configuration. © 2014 the Owner Societies.

Liu Y.-S.,Soochow University of China | Liu Y.-S.,Jiangsu Laboratory of Advanced Functional Materials | Wang X.-F.,Soochow University of China | Chi F.,Bohai University
Journal of Materials Chemistry C | Year: 2013

Based on nonequilibrium Green's functions (NGF) and density-functional theory (DFT), we investigate the magnetotransport properties and magnetothermoelectric effects in zigzag graphene nanoribbons (ZGNRs) with non-magnetic doping on the double ribbon edges. One of the carbon atoms without hydrogen saturation in each ribbon edge is replaced by one boron (B) or one nitrogen (N) atom. Compared with boron-boron (BB) and nitrogen-nitrogen (NN) double-edge doping, the boron-nitrogen (BN) double-edge doping induces a perfect spin-filter effect with 100% negative spin polarization at the Fermi level. Moreover, we find that the thermoelectric effect can be enhanced by the double-edge doping. Interestingly, the spin Seebeck effect in NN- and BN-doped ZGNRs becomes comparable with the charge Seebeck effect and even larger than it. These results originate from the spin-dependent transmission node near the Fermi level induced by the non-magnetic doping. These findings strongly suggest that the double-edge-doped ZGNRs are promising materials for spintronics and thermo-spintronics. © 2013 The Royal Society of Chemistry.

Zuo X.-B.,Changshu Institute of Technology | Zuo X.-B.,Jiangsu Laboratory of Advanced Functional Materials | Han P.-P.,Changshu Institute of Technology | Su Z.-C.,Changshu Institute of Technology | Zhu Y.-H.,Changshu Institute of Technology
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2010

In order to develop the enameled wire with good heat resistance and direct tin solderability, using m-phthalic acid, adipate, glycol or ethanolamine and glycerol or tri-ethanolamine, serial polyester polyols were synthesized by melt co-polycondensation reaction. The synthesized polyester polyols were then mixed with methanol-etherfied amino resin and solvent to form the enameling solutions used for coating copper wire to prepare the enameled wires. The results show that the molecular weights and the acid values of the synthesized polyester polyols satisfy the technical requirement of the enameled wire preparation. It was found that, during melt co-polycondensation, using ethanolamine instead of glycol or using tri-ethanolamine instead of glycerol, the polycondensation reaction activity increases; and during temperature range of 350~400°C, the pyrolyses of the synthesized polyester polyols become faster and with less pyrolysis residue. The enameled wires prepared by using most of the above enameling solutions have good direct tin solderability at 400~460°C, and the inflexion point temperature of their dielectric loss curves can reach 162°C; It means that the enameled wires prepared can have a higher heat resistant class.

Zuo X.-B.,Changshu Institute of Technology | Zuo X.-B.,Jiangsu Laboratory of Advanced Functional Materials | Ni Y.-Z.,Changshu Institute of Technology | Gao P.,Changshu Institute of Technology | And 2 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

A novel technics of preparation of poly (urethane-ester-imide) (PUEI) was developed. First, N, N′-bis(β-hydroxyethyl)pyromallitimide (HEPMI) monomer was synthesized by reaction of ethanolamine and pyromellitic anhydride in dimethylformamide. In the period of intermediate amide-acid formation, the method of reactor dipped in ice-water and fed step-by-step were implemented. The poly (ester-imide) (PEI) polyol was synthesized by copolycondensation of HEPMI, apidic acid and glycerol, than the PUEI was obtained by crosslink reaction of PEI polyol and polyisocyanate. The results show that the PEI polyol are behaved higher viscous flow temperature and inherent viscosity, and that similar solubility in dimethylformamide, methyl pyrrolidone and m/p-cresol compared with polyester polyol. The PUEI are behaved better pyrolysis stability and solvent-resistant compared with poly (urethane-ester).

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