Authors: Sung Gap Lee, Sang Man Park, Young Hie Lee, Sung Pill Nam
Abstract: Ferroelectric PZT(70/30) thick films were fabricated by the hybrid technique adding the sol
coating process to the screen-printing process to obtain a good densification. Structural and electrical
properties of the thick films with the sol concentration were investigated. The relative dielectric
constant increased and dielectric loss decreased with increasing the sol concentration, the values of
the thick film coated with sol concentration of 1.5 M were 698 and 2.5 % at 1 kHz, respectively. And
the remanent polarization and dielectric breakdown strength of the thick film coated with sol
concentration of 1.5 M were about 38 μC/cm2 and 200 kV/cm, respectively. The leakage current
densities were less than 10-8 A/cm2 at the applied electric field range of 0-100 kV/cm in all thick films.
549
Authors: Hua Feng Zhang, Yu Zhong Zhang, Li Gang Lin, Xiao Li Ding, Hong Li
Abstract: Polyvinylidene fluoride (PVDF) hydrophobic membrane has been prepared by phase inversion method. The effects of concentration of PVDF, different processes of preparations, and different surface roughness on hydrophobic capability of membrane surface (water contact angle, WCA) have been investigated. The results showed that, hydrophobic ability of PVDF membranes decreased with the increasing concentration of PVDF. WCA of membrane prepared by was increasing. Membrane surface hydrophobic ability increased with the increasing surface roughness. The contact angle of membrane comes to 141° with dry process and 10% PVDF concentration.
338
Authors: Chao Wang, Mei Xu, Yu Peng Zhu, Yu Qiao, Lin Lin Cai
Abstract: In this paper, the effect of environment factors on KGM molecular dimension was discussed, such as ultrasonic, enzyme, concentration and temperature. The KGM polarity, molecular weight (Mw) and conformation were analyzed by digital polarimeter and LLS. The result indicated that the polarity change influenced by temperature and ultrasonic accorded with linear function equation. Mw of KGM gradually decreased with ultrasonic time and concentration of enzyme increase. The concentration of KGM was lower, the effect was more obviously. The changes of KGM Mw also brought regular change of molecular conformation. All offers the reference to reliabletheoretical foundations on controlling KGM molecular dimension and industrial application in exploiting KGM potential function and activity.
1336
Authors: Hui Ping Song, Ying Ying Jiang, Fang Qin Cheng
Abstract: The ammonia-nitrogen wastewater was purified by using electrodialysis (ED) device in this paper. The NH4Cl solution was used as the artificial ammonia-nitrogen wastewater. Various unsteady factors in the experiment may cause the concentration polarization phenomenon, which may have negative effect on ED cell performance and its lifetime. The limiting voltage was confirmed as 12V in this study. At steady-state operation condition of ED, the outlet concentration was measured at different operation voltages, feed concentrations, and concentrations ratio of two cells. The efficiency of ammonia-nitrogen removal was evaluated in different conditions by a factorially designed experiment. The results from the experiment indicate the best process conditions for the ED, that is, the voltage was 12V, and the concentrations ratio of two cells was 1:3. It seems that the ammonia-nitrogen removal is more effective for a higher feed concentration stream.
1346
Authors: De Wen Gao, Tian Lan Yin, Guang Ming Wu, Guang Jian Xing, Yao Ding, Yang Zhou
Abstract: AZO precursor solution was prepared with dihydrate zinc acetate as raw materials, ethylene glycol monomethyl ether and ethanol as solvent, ethanolamine as a stabilizer, hexahydrate aluminum chloride as the dopant. The AZO thin films were prepared on glass substrates by using homemade liquid level settlement device. The orthogonal design of the experimental conditions was made to optimize the conditions of this method for the preparation of AZO thin films. The films were analyzed by XRD, UV-Vis, AFM, four-probe, step profiler and other methods. The results show that the optimal conditions for preparation of AZO thin films were as follows: the sol concentration was 0.5mol/L, the Al3+/Zn2+ concentration ratio was 4 at%, the drying temperature was 100 °C for 10 minutes, the pretreatment temperature was 450 °C, the coating layers were 20, the level settling velocity was 5 cm/min, the pretreatment time was 10 minutes, the annealing temperature was 550 °C for 2 h. The average transmittance in visible light and the sheet resistance of the AZO thin films were 88% and 536Ω/□, respectively.
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