采用KH550为硅烷偶联剂对纳米SiO2进行改性，对改性前后的纳米SiO2采用XRD、TEM、FTIR、NMR等表征手段研究样品的微观结构、表面羟基含量、有机/无机界面相互作用等问题。实验结果表明，纳米SiO2经过KH550的改性，亲水性减弱、亲油性增强，表面质子运动活性也随之增加，并且KH550与SiO2有相互作用存在。29 Si核的NMR谱表明，由于KH550与纳米SiO2表面的偶极相互作用，分子运动变慢，使得纳米SiO2改性后的29 Si弛豫时间比改性前明显增加。%The surface of nano-SiO2 particles was modified with silane coupling agent(3-aminopropyl triethoxysilane,KH550). X-ray diffraction(XRD),Transmission electron microscope(TEM),Fourier transform infrared spectroscop(FTIR)and Nuclear Magnetic Resonance( NMR) were adopted to characterize and analyze microstructure,surface hydroxyl content,organic-inorganic interface in-teraction of the unmodified and modified nano-SiO2 particles. The results indicated that after surface modification, hydrophilic of nano-SiO2 weakened,hydrophobic of nano-SiO2 increased, and interactions between KH550 and nano-SiO2 existed. Moreover,29 Si NMR indicated that because of the existence of dipole interactions between KH550 and nano-SiO2 ,molecular motion slowed down, and 29 Si relaxation time of KH550 modified nano-SiO2 were longer than that of nano-SiO2 .
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