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kele135木虫 (正式写手)
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[求助]
coagulation 和 condensation
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最近看文献，发现这样一句话：It is known that nanocrystal growth by coagulation leads to very broad size distributions, whereas growth by condensation leads to narrow size distributions, which further implies the Ostwald ripening process. 弄不清coagulation 和 condensation的区别，希望知道的大侠用中文解释一下！。。。多谢 |
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jiangcj09
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wandaohzl(金币+2): 鼓励应助 2011-05-08 12:52:22
wandaohzl(金币+2): 鼓励应助 2011-05-08 12:52:22
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词典上 condensation相关的意思有： a: a chemical reaction involving union between molecules often with elimination of a simple molecule (as water) to form a new more complex compound of often greater molecular weight b: the conversion of a substance (as water) from the vapor state to a denser liquid or solid state usually initiated by a reduction in temperature of the vapor 我又查了下文献，在纳米晶生长方面，不少取的是第一条意思：简单小分子结合成复杂的大分子。 例如， Ohmori and Matijevic optimized coating conditions and coated spindle-shaped hematite (a-Fe2O3) particles with silica layers by hydrolysis of the alkoxide tetraethoxysilane (TEOS) in 2-propanol.[11,53] (This method is known as the Stöber process, which is based on the hydroxide-catalyzed hydrolysis of an alkoxysilane and condensation of the resulting silanol groups[77]). （Nanoengineering of Particle Surfaces, Adv. Mater. 2001, 13, No. 1, January 5，16页） This method involves the formation of a TiO2 sol or gel or precipitation by hydrolysis and condensation (with polymer formation) of titanium alkoxides. (O. Carp et al. / Progress in Solid State Chemistry 32 (2004) 33–177，47页) The sol-gel method is based on inorganic polymerization reactions. The sol-gel process includes four steps: hydrolysis, polycondensation, drying, and thermal decomposition. Precursors |
6楼2011-05-08 10:38:05
jiangcj09
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2楼2011-05-07 19:09:08
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4楼2011-05-08 00:08:44