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Articles by Jin Yang
Total Records ( 2 ) for Jin Yang
  Yu Zhang , Jin Yang , Guo-Dong Li , Feng Zhang and Jie-Sheng Chen
  Two new erbium compounds, [Er2(BDC)3(DMF)2] (1) and [Er2(CQC)3(DMF)3(H2O)] · DMF · H2O (2), where BDC stands for 1,4-benzenedicarboxylate, CQC for 2-(4-carboxyquinolin-2-yl)quinoline-4-carboxylate, and DMF for N,N-dimethylformamide, have been synthesized through pre-heating and cooling-down crystallization. In 1 the Er(III) is seven-coordinate with oxygen atoms from six BDC and one DMF, forming a three-dimensional open-framework structure. Compound 2 possesses a 2D structure based on dinuclear Er(III) building units. The photoluminescence of 1 has also been investigated.
  Xiangyang Liu , Ligang Ren , Xu Wang , Hua Lai , Jin Yang and Yi Gu
  A novel diamine containing aryl ester side chains end-capped with alkoxy groups was synthesised and characterised by Fourier transform infrared spectrometry and 1H-nuclear magnetic resonance. Based on the diamine, a series of copolyimide alignment films were prepared by a one-step process. The effects of side chain content of polyimides on surface energy, surface element components and surface morphology were studied by contact angle measurement, attenuated total reflection Fourier transform infrared spectrometry, x-ray photoelectron spectroscopy and atomic force microscopy. These investigations show that the surface energy decreases linearly with the increase of side chain content in a certain range and then levels off. Side chains with alkyl groups can transfer to the surface spontaneously, which makes the content of side chain on the surface notably higher than that in the matrix. However, when side chain content reaches 60 mol%, further transference stops. The enrichment of side chains on the surface of alignment films could be considered as the reason for the increase of the pretilt angle.
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