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bobothunders

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Ò»°ãÊǰÑTEOS»òMEOSÔڵͼ¶´¼Èç¼×´¼£¬ÒÒ´¼£¬Òì±û´¼µÈÈܼÁÖÐË®½â£¬¼ÓÈë¹èÍéżÁª¼ÁÈçTSL8380£¬Ë®½âÌõ¼þ¼È¿ÉÒÔÊÇËáÐÔ£¬Ò²¿ÉÒÔÊǼîÐÔ¡£ÎÒ×öʱÊÇÔÚËáÐÔÌõ¼þ£¬ÓÃÏõËáµ÷½ÚPHÖµµ½2--3£¬60¶È×óÓÒË®½â£¬ËæÊ±¼äµÄÔö¼ÓÁ£¾¶Ôö´ó¡£
11Â¥2008-01-17 11:35:54
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wqnow

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ÒýÓûØÌû:
Originally posted by 604gq at 2007-12-29 18:03:
ÎÒ¸æËßÄãÅä·½°É

12Â¥2008-01-17 20:23:45
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gloria888

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13Â¥2008-01-22 13:00:59
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sciendemo

Í­³æ (СÓÐÃûÆø)

there's a classical Stoeber method to prepare spherical silica nanoparticles.

In ethanol, TEOS is hydrolized and then condenses catalyzed by ammonia.
14Â¥2008-01-23 02:14:40
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lqlljq2005123

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ÎÒ×ö¹ý£¬ÓÃÒì±û´¼×öÈܼÁ¡£×ö³öÀ´µÄÇòÐκ㬵«ÊÇÓÐ200ÄÉÃ×´ó¡£Ë³±ãÇë½ÌÓÐûÓÐʲô°ì·¨¿ÉÒÔ½µµÍ¶þÑõ»¯¹è°ü¸²ÄÉÃײÄÁϵĺñ¶È£¿
15Â¥2008-01-25 21:45:31
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sciendemo

Í­³æ (СÓÐÃûÆø)

ÒýÓûØÌû:
Originally posted by lqlljq2005123 at 2008-1-25 21:45:
ÎÒ×ö¹ý£¬ÓÃÒì±û´¼×öÈܼÁ¡£×ö³öÀ´µÄÇòÐκ㬵«ÊÇÓÐ200ÄÉÃ×´ó¡£Ë³±ãÇë½ÌÓÐûÓÐʲô°ì·¨¿ÉÒÔ½µµÍ¶þÑõ»¯¹è°ü¸²ÄÉÃײÄÁϵĺñ¶È£¿

According to my experience, smaller particles can be obtained in ethanol. And a lower concerntration of ammonia can produce smaller silica. the smallest particle prepared by this method is around 20 nm , but when particles are less than 50 nm, they are less spherical and homogenious.

By the way, what do you use silica to coat?
16Â¥2008-01-26 00:52:24
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