硅烷偶联剂对Fe3O4@SiO2的表面修饰及性能

The Modification of Fe3O4@SiO2 by Silane Coupling Agent and Performance

通过St ber水解缩聚法制备了分散性良好的类球形Fe3O4@SiO2纳米颗粒(记为S1),其粒径为300~430 nm。为探讨硅烷偶联剂中碳原子数对磁性颗粒疏水性的影响,分别以甲基三乙氧基硅烷、正己基三乙氧基硅烷、正十二烷基三甲氧基硅烷、正十八烷基三乙氧基硅烷修饰Fe3O4@SiO2颗粒表面(所得产品分别记为S2 S5),并通过TEM、SEM、XRD、FTIR及TGA进行表征。结果表明,磁性颗粒的静态接触角θW分别为10.6、42.6、113.6、128.0和148.3,随着修饰物中碳原子数的增加,接触角逐渐增大;表面疏水链包覆量分别为0.005、0.087、0.092g/g和0.087g/g。4种有机硅修饰的磁性颗粒均可去除水面浮油,其中正十二烷基三甲氧基硅烷修饰的磁性颗粒浮油去除效果最佳。

Spherical Fe3O4@SiO2 nanoparticles with good dispersibility(denoted as S1)were prepared by St ber hydrolysis polycondensation method,and the particle size was 300~430 nm.In order to investigate effect of carbon number in the organosilicone on 51 hydrophobicity and demusification of magnetic nanoparticles,the methyl triethoxysilane,n hexyltriethoxysilane,n dodecyltrimethoxysilane and n octadecyltriethoxysilane were used to modify the surface of the S1 respectively,and the products were marked for S2 S5.The magnetic samples were characterized by electron microscopy(TEM),scanning electron microscope(SEM),X ray diffraction(XRD),fourier transform infrared(FTIR)spectra and thermogravimetric analyses(TGA).The static water contact angle of magnetic nanoparticles(θW)were 10.6、42.6、113.6、128.0 and 148.3 for S1 S5 respectively,and the results indicated that theθW increased with carbon number in the silane coupling agent increasing.Besides,the hydrophobic coating amount on the S1 surface of S2 S5 were estimated to be 0.005,0.087,0.092 g/g and 0.087 g/g respectively.The samples can be applied to removal the oil from water surfaces.Four kinds of silicone modified magnetic particles can remove the surface oil,the n dodecyltrimethoxysilane modified magnetic particles have the best effect of removing oil.