盐酸沉淀法制备纳米SiO_2/粉煤灰微珠复合颗粒  

Preparation of nano SiO_2/cenosphere composites by chemical precipitation

作　　者：魏征[1,2] 杨冰[1,3] 赵鸣[2] 姚有为[3] 杨玉芬[1] 盖国胜[1] 

机构地区：[1]清华大学材料学院,北京100084 [2]太原理工大学矿业工程学院,山西太原030024 [3]清华大学深圳研究生院,广东深圳518055

出　　处：《中国矿业大学学报》2014年第3期472-477,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51072097;51172125)

摘　　要：以工业级粉煤灰微珠和模数为3.3的水玻璃溶液为原料,采用盐酸沉淀法,利用非均相形核沉积原理,在微米级粉煤灰颗粒表面包覆一层纳米SiO2颗粒.通过扫描电子显微镜、X射线衍射仪、傅里叶转换红外线光谱仪等对包覆产物进行表征,制备得到了具有"核-壳"结构的微珠/SiO2复合结构颗粒,同时SiO2包覆层是以Si-O-Si键的形式结合于微珠表面并不断生长.对这种二级结构复合颗粒进行有机疏水改性,通过"涂敷法"构建超疏水性表面,表面平均接触角为152.4°,达到超疏水性能要求.The industrial fly ash cenoshpere and water glass solution （the modulus is 3.3） were used as raw materials to coat a layer of nano Si0_2 particles on the surface of fly ash cenospheres by means of chemical precipitation and heterogeneous nucleation. A core-shell structured nano Si0_2/ cenoshpere composites was prepared which was confirmed by SEM, XRD and FTIR. The Si0_2 layer nucleated and grew on the surface of cenosphere by Si-O-Si bond. The super-hydrophohic surface of the composites was formed by treating the composites with organic reagent. The average contact angle for the prepared surface is 152.4°, which indicates that the prepared surface is super hydrophobic.

关 键 词：粉煤灰微珠 水玻璃 纳米SIO2 功能化改性 核壳结构 

分 类 号：TQ172[化学工程—水泥工业]