An inorganic-organic nanohybrid particle with a two-dimensional chain structure, diphenylsiloxane-silica (Ph 2 SiO-SiO 2 ), was prepared by sol-gel process using diphenyldiethoxysilane (DPDES) and tetraethoxysilane (TEOS), and a high proton conducting polymer of poly(2-acrylamido-2-methyl-1-propane sulfonic acid) (PAMPS) was deposited on the Ph 2 SiO-SiO 2 particles via layer-by-layer assembly. A flexible sheet-like electrolyte was successfully obtained from the resulting PAMPSdeposited particles by pressing. The proton conductivity of the sheet prepared using unmodified Ph 2 SiO-SiO 2 particles was lower than 10 À9 S/cm at 801C. On the other hand, the PAMPSdeposited samples showed proton conductivities B7 orders of magnitude higher than those of the sample prepared using unmodified particles, and their conductivity reached about 1 Â 10 À2 S/cm at 801C and 80% relative humidity. This is ascribed to the PAMPS layer being concentrated at the particle interfaces, which percolated throughout the monolithic sample.
Silicon carbide is a very important material for various applications and its properties are expected to be improved by controlling the crystallographic orientation. It was difficult to simultaneously consolidate SiC powder and sintering additives by electrophoretic deposition (EPD) because of the different electrophoretic mobility. When using the alumina-coated SiC by the solgel method, it is possible to deposit SiC and sintering additives by EPD at the same time.In this study, we demonstrated that the c-axis alignment of SiC was controlled by EPD and a strong magnetic field, and we investigated the effect of the surface-modification on the microstructure and the degree of orientation. The dilute solution and the large number of repeated coating times prevent the oxide phase from precipitating at the multiple grain junctions and enhance grain growth. The grain growth promoted the degree of orientation in the textured SiC prepared by EPD in a strong magnetic field.
The surface modification of SiC powder with an alumina precursor was achieved by a sol-gel method to apply the electrophoretic deposition (EPD) technique to the shaping of the SiC powder. The isoelectric point of the surface-modified SiC powder with sol-gel-derived alumina precursor was shifted to around pH 9, which is close to that of alumina. The alumina-coated SiC deposited on a cathodic substrate by EPD. The green compact of surface-modified SiC powder was sintered by hot pressing in an argon atmosphere at 2000oC.
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