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汪信, Jianfei
,-0001,():
-1年11月30日
In order to disperse silicon carbide (SiC) nanoparticles homogeneously in a non-aqueous medium, the surface of SiC nanoparticles needs to be modified via surface organic functionalization. A method of SiC nanoparticle surface modification by grafting of polyacetals via inorganic–organic composite coating was developed. The resulting graft percentage of up to 10.5% was much higher than that of direct grafting. The inorganic–organic composite coating on a SiC nanoparticle surface led to an almost complete decomposition of the secondary structure of the agglomerates and the formation of the primary structure. Dispersibility of the modified version was studied by using a transmission electron microscope (TEM) and size distribution analyser. The sedimentation experiments showed that the coated SiC nanoparticles exhibited good suspension stability in butanone. The composition of the inorganic–organic composite coating on the SiC nanoparticles was investigated by energy dispersive x-ray analyses (EDX), hydrogen nuclear magnetic resonance (1H NMR) and Fourier-transformed infrared spectroscopy (FT-IR). This work provides a novel concept of surface grafting modification for non-oxide nanoparticles to improve their dispersibility in non-aqueous medium.
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汪信, Chun
Journal of Colloid and Interface Science 310, (2007)643-647,-0001,():
-1年11月30日
TiO2/ZrO2
Titania,
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汪信, Qingli
Macromol. Rapid Commum. 2005, 26, 1099-1103,-0001,():
-1年11月30日
A
conducting
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汪信, Junwu
Materials Science and Engineering A384(2004)172-176,-0001,():
-1年11月30日
Needle-shaped copper oxide (CuO) nanocrystals have been successfully prepared by hydrolysis of copper acetate (Cu(OAc)2) solution. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis absorption spectroscopy. The results show that the diameters of the needle-shaped CuO nanocrystals can be controlled between 10 and 45 nm simply by varying the concentration of Cu(OAc)2 solution, the presence of small amounts of cetyltrimethylammonium bromide (CTAB) can render needle-shaped CuO well dispersed. The band gap is estimated to be 2.78 eV according the results of the optical measurements of the CuO nanocrystals.
Needle-shaped,
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