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coagulation ºÍ condensation
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×î½ü¿´ÎÄÏ×£¬·¢ÏÖÕâÑùÒ»¾ä»°£ºIt 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. Ū²»Çåcoagulation ºÍ condensationµÄÇø±ð£¬Ï£ÍûÖªµÀµÄ´óÏÀÓÃÖÐÎĽâÊÍһϣ¡¡£¡£¡£¶àл |
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wandaohzl(½ð±Ò+1): ¹ÄÀø½»Á÷ 2011-05-08 12:51:52
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2Â¥2011-05-07 19:09:08
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3Â¥2011-05-07 22:17:53
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4Â¥2011-05-08 00:08:44
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ͨË×Ò»µã˵£¬coagulationÊÇÄÉÃ׿ÅÁ£ÓëÄÉÃ׿ÅÁ£Ö®¼äµÄ×÷Ó㬼¸¸ö¿ÅÁ£Åöµ½Ò»Æð£¬³¤Ò»¿éÁË¡£ condensation²»ÊÇÄÉÃ׿ÅÁ£Ö®¼äµÄÖ±½Ó×÷Ó㬶øÊÇÉæ¼°µ½×é³ÉÄÉÃ׿ÅÁ£µÄÔ×Ó/Àë×Ó/·Ö×ӵĽâÀëºÍ³Á»ý¡£ ÀýÈ磬AgI½ºÌåÖУ¬¼¸¸öAgIÄÉÃ׿ÅÁ£»¥ÏàÅöײ£¬¾Û²¢µ½Ò»ÆðÐγÉaggregate¾ÍÊÇcoagulation¹ý³Ì¡£Ð¡µÄAgI¿ÅÁ£ÉϵÄAg+Àë×Ó»òÕßI-Àë×ÓÈܽâÈ»ºóÅܵ½´óµÄAgI¿ÅÁ£ÉϳÁ»ý£¬Õâ¸ö¹ý³Ì¾ÍÊÇOstwald ripening£¬Éæ¼°µ½condensation¡£ |
5Â¥2011-05-08 01:54:01
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wandaohzl(½ð±Ò+2): ¹ÄÀøÓ¦Öú 2011-05-08 12:52:22
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´ÊµäÉÏ condensationÏà¹ØµÄÒâ˼ÓУº 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 ÎÒÓÖ²éÁËÏÂÎÄÏ×£¬ÔÚÄÉÃ×¾§Éú³¤·½Ã棬²»ÉÙÈ¡µÄÊǵÚÒ»ÌõÒâ˼£º¼òµ¥Ð¡·Ö×Ó½áºÏ³É¸´ÔӵĴó·Ö×Ó¡£ ÀýÈ磬 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£¬16Ò³£© 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¨C177£¬47Ò³) The sol-gel method is based on inorganic polymerization reactions. The sol-gel process includes four steps: hydrolysis, polycondensation, drying, and thermal decomposition. Precursors |
6Â¥2011-05-08 10:38:05
jiangcj09
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wandaohzl(½ð±Ò+1): ¹ÄÀø½»Á÷ 2011-05-08 12:52:30
wandaohzl(½ð±Ò+1): ¹ÄÀø½»Á÷ 2011-05-08 12:52:30
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The sol-gel method is based on inorganic polymerization reactions. The sol-gel process includes four steps: hydrolysis, polycondensation, drying, and thermal decomposition. £¨Chemical Reviews, 2005, Vol. 105, No. 4 1034Ò³£© Ò²ÓеڶþÖÖÒâ˼µÄ£¬Ïñ£º Physical Vapor Deposition (PVD). PVD involves [color=]condensation from the vapor phase. The PVD process is composed of three main steps: (a) generating a vapor phase by evaporation or sublimation of the material, (b) transporting the material from the source to the substrate, and (c) formation of the particle and/or film by nucleation and growth. £¨Chemical Reviews, 2005, Vol. 105, No. 4 1039Ò³£© |
7Â¥2011-05-08 10:42:03














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