【摘要】 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。29Si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29Si弛豫时间比改性前明显增加。更多还原

【Abstract】 The surface of nano-SiO2particles 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 interaction of the unmodified and modified nano-SiO2 particles.The results indicated that after surface modification,hydrophilic of nano-SiO2weakened,hydrophobic of nano-SiO2increased,and interactions between KH550 and nano-SiO2 existed.Moreover,29Si NMR indicated that because of the existence of dipole interactions between KH550 and nano-SiO2,molecular motion slowed down,and 29Si relaxation time of KH550 modified nano-SiO2 were longer than that of nano-SiO2.更多还原