人工晶体学报2017，Vol.46Issue(10)：2030-2036,7.
单分散SiO2微球的制备及疏水改性研究
Preparation and Hydrophobic Modification of Monodisperse SiO2 Nanospheres
摘要
Abstract
Monodispersed SiO 2 nanospheres with diameters of 200-800 nm were prepared by improved St?ber method where the tetraethyl silicate ( TEOS ) , deionized water and ethanol were used as the raw materials.To avoid aggregation , the obtained wet nanospheres were dried by vacuum freeze drying technique afterward .The supercritical ethanol was used to modify the surfaces of the SiO 2 nanospheres as hydrophobic .The morphologies and sizes of the nanosphers were investigated by the scanning electron microscope ( SEM ) . And the size distribution of the pores was investigated by N 2 absorption and desorption measurement .The hydrophobic properties of the particles were characterized by measuring their contact angle to water .Fourier transform infrared spectroscopy ( FTIR ) was used to detect the chemical groups on the surfaces of the particles . The results show that the diameter of the SiO 2 nanospheres initially increase and then decrease as the amount of the second addition of TEOS increase . The FTIR results show that by supercritical ethanol treatment , the surface of SiO 2 nanospheres was grafted with alkyl groups successfully , which make the particles show hydrophobic properties .The smallest treated particles show the best hydrophobic performance , with their contact angle to water as high as 149 °.The amount of the treated particles has no obvious influence on the result .With this method , more than 12 g particles could be treated as hydrophobic ( contact angle to water as high as 140°) in one batch , which meet the laboratory-scale demand quite well .Since the hydrophobic SiO 2 nanospheres prepared by us are easy to be dispersed and had the advantage of monodispersity , they would have a potential application in the field of 3-DOM.关键词
单分散SiO2微球/疏水改性/真空冷冻干燥/乙醇超临界Key words
monodispersed SiO 2 nanosphere/hydrophobic modified/vacuum freeze drying/ethanol supercritical分类
矿业与冶金引用本文复制引用
杨春,邵婷,罗炫,曹林洪,蒋晓东..单分散SiO2微球的制备及疏水改性研究[J].人工晶体学报,2017,46(10):2030-2036,7.基金项目
中国工程物理研究院科学技术发展项目基金( 2015 B0302071 ) （ 2015 B0302071 ）
西南科技大学重点科研平台专职科研创新团队建设基金(14tdjk04) （14tdjk04）
龙山学术人才科研支持计划(17LZX505) （17LZX505）
