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浮躁的很銅蟲(chóng) (小有名氣)
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[求助]
球形介孔二氧化硅的制備通常用什么做模板 已有2人參與
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| 小弟想做出不同孔徑大小的介孔二氧化硅,可以用溶劑溶掉的,不能煅燒,請(qǐng)問(wèn)各位大神用什么做模板好呢 |
新蟲(chóng) (初入文壇)
至尊木蟲(chóng) (著名寫(xiě)手)
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Facile Large-Scale Synthesis of Monodisperse Mesoporous Silica Nanospheres with Tunable Pore Structure Mesoporous silica nanoparticles (MSNs) are experiencing rapid development in the biomedical field for imaging and for use in heterogeneous catalysis. Although the synthesis of MSNs with various morphologies and particle sizes has been reported, synthesis of a pore network with monodispersion control below 200 nm is still challenging. We achieved this goal using mild conditions. The reaction occurred at atmospheric pressure with a templating sol–gel technique using cetyltrimethylammonium (CTA+) as the templating surfactant and small organic amines (SOAs) as the mineralizing agent. Production of small pore sizes was performed for the first time, using pure and redispersible monodispersed porous nanophases with either stellate (ST) or raspberry-like (RB) channel morphologies. Tosylate (Tos–) counterions favored ST and bromide (Br–) RB morphologies at ultralow SOA concentrations. Both anions yielded a worm-like (WO) morphology at high SOA concentrations. A three-step formation mechanism based on self-assembly and ion competition at the electrical palisade of micelles is proposed. Facile recovery and redispersion using specific SOAs allowed a high yield production at the kilogram scale. This novel technique has practical applications in industry. 介孔二氧化硅納米顆粒的合成實(shí)現(xiàn)了重要突破,不僅解決了MSNs規(guī);苽涞碾y題,率先實(shí)現(xiàn)了介孔二氧化硅納米顆粒公斤級(jí)合成,而且可以實(shí)現(xiàn)顆粒內(nèi)部孔道結(jié)構(gòu)的有效調(diào)變,如 發(fā)散狀、蠕蟲(chóng)狀等。另外,作者系統(tǒng)研究了介孔二氧化硅納米顆粒的合成機(jī)理,很值得一讀。 http://pubs.acs.org/doi/abs/10.1021/ja3116873 Fig.1-07-11-2012.jpg |

銅蟲(chóng) (小有名氣)
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