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lo@丹丹@ve

金虫 (小有名气)

[求助] 求助200nm左右的二氧化硅球的做法 已有5人参与

现想以二氧化硅作为模板进行材料合成,相合成200nm左右的二氧化硅颗粒,但是现在的问题是合成出的二氧化硅均在400-500nm之间,求各路大神指导。
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1024285031

木虫 (著名写手)

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???????:
7?: Originally posted by peihaimeng at 2015-04-10 17:25:26
????   ?????????200nm???????????????  ???????????   лл...

???????4?????????????????????????????????TEOS,????????????????????????????????????λ???????????????????????10h???????????????????羵?????????????????á????????????????4??ɡ?The preparation of different sized silica spheres involves the ammonia-catalyzed hydrolysis and condensation of TEOS in an aqueous ethanol solution via the classical st?ober method.21,22 Taking the synthesis of ∼190 nm silica spheres as an example, 15 mL of absolute ethanol, 5 mL of DI water, and 0.7 mL of 28% NH3 3H2O were mixed and stirred. A total of 0.6 mL of TEOS was added into the mixture quickly. After a reaction time of about 10 h, the silica spheres were isolated by centrifugation. Then the white precipitate was washed with ethanol three times.
8楼2015-04-10 20:16:03
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zhangjun1988

金虫 (正式写手)

你好,请问你是用什么方法合成的,有参考文献吗?粒径大小和滴加速度也是有关系的。
为化学科研奋斗
2楼2015-03-28 09:03:49
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风靡815

金虫 (正式写手)

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往大做可以 要是把粒径往小做不容易,我合成一般在150nm左右 比较均匀的,200nm的话也能做出来 现在怎么能做到50nm左右 是个问题
nooneisperfect
3楼2015-03-28 09:41:40
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nanofollower

专家顾问 (著名写手)

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????????????Langmuir 2011, 27, 7185?C7191?????????????????????????
??鲿?????????The preparation of different sized silica spheres involves the ammonia-catalyzed hydrolysis and condensation of TEOS in an aqueous ethanol solution via the classical st?ober method.21,22 Taking the synthesis of ∼190 nm silica spheres as an example, 15 mL of absolute ethanol, 5 mL of DI water, and 0.7 mL of 28% NH3 3H2O were mixed and stirred. A total of 0.6 mL of TEOS was added into the mixture quickly. After a reaction time of about 10 h, the silica spheres were isolated by centrifugation. Then the white precipitate was washed with ethanol three times.
4楼2015-03-28 09:56:35
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