智能定位王鹏程,柳 松,刘梦溪
小型地源热泵
(华南理工大学应用化学系,广东广州510640
电子念佛器
摘 要:为得到单分散纳米二氧化硅颗粒,同时提高纳米二氧化硅颗粒在有机溶剂中的分散性。先采用改进工艺条件的溶胶-凝胶法制备纳米二氧化硅颗粒,研究了R[R=c(H2
O/c(TEOS]、氨水浓度、TEOS(正硅酸乙酯浓度、温度对纳米二氧化硅颗粒粒径的影响,采用TEM对颗粒形貌、粒径进行了表征。结果表明,随着R、氨水浓度和TEOS浓度的增大,二氧化硅粒径增大;随着反应温度的增加,二氧化硅粒径减小。用聚乙二醇和癸二酸缩聚得到的两亲性聚酯对自制的二氧化硅颗粒进行表面吸附改性。并用FT-I R、TG、TE M对改性前后的纳米二氧化硅的结构、分散性进行了表征。结果表明,改性后的纳米二氧化硅在甲苯中具有良好的分散性。 关键词:溶胶-凝胶法;纳米二氧化硅;两亲性聚酯;甲苯
中图分类号:TQ127.2 文献标识码:A 文章编号:1006-4990(201102-0040-04
St udy on preparation and dispersivit y of m onodisperse silica nanoparticles
W ang Pengcheng,L i u Song,Liu M engx i
(D epart m ent of App lied Che m istry,South China U ni ver sity of T echnology,Guangzhou510640,Ch i na
A bstrac t:In order t o obta i n monod isperse sili ca nanoparticles,and to i m prove t he dispers i on o f s ilica nanoparticles i n o rganic so l v ents,s ilica nanoparti c les w ere successfull y prepared by i m proved so l-ge lm ethod.Infl uences of R ra tio[R=c
龙芯3b
(H
2O/c(TEO S],a mm onia concentration,TEO S concentrati on,and te m perature on t he particle s i ze o f nano-sized Si O
2
五行果蔬
钓鱼船w ere st udied.M o rpho l ogy and pa rti c l e size we re character i zed by TE M.Itw as f ound t hat t he particle size o f nano-sized silica increased w it h t he i ncreasi ng o f R ra tio,a mmon i a concentra ti on,and TEO S concentrati on,how eve r,decreased w it h the i n c reasi ng o f reacti on te m pera t ure.T hen,the prepared s ilica nanoparticles w ere mod ified by usi ng amph i philic po lyesters ob ta i ned by po l ycondensa ti on o f po lyethy leneg l yco l and sebac ic ac i d.Struc t ure and dispersi v ity of the mod ifi ed and un mod ifi ed nano-si zed silica w ere charac terized by FT-I R,TG,and TE M.R esults showed t hat t he m od ifi ed nano-s i zed S i O
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