【摘要】 以纳米SiO₂水溶胶为原料,3-氨丙基三乙氧基硅烷（APTES）和3-氯丙基三乙氧基硅烷（CPTES）为改性剂,在水基环境下分别对SiO₂纳米粒子进行改性,得到了具有亲水特性的APTES改性SiO₂粒子和具有亲油特性的CPTES改性SiO₂粒子水溶胶。2种粒子按不同比例混合,利用接枝在SiO₂粒子表面氨基和氯丙基的取代反应,使得2种具有亲水/亲油特性的改性SiO₂纳米粒子偶联,制备了粒径为40～50 nm的哑铃型SiO₂纳米粒子。并通过透射电镜（TEM）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）以及动态光散射（DLS）等方法对其进行了系统表征。结果表明,2种粒子成功偶联形成了具有哑铃型结构的水相SiO₂纳米粒子,该粒子两面具有不同的亲水性,粒径近似等于APTES改性SiO₂粒子和CPTES改性SiO₂粒子的粒径之和。更多还原

【Abstract】 Anisotropic SiO₂ nanoparticles with dumbbell-like structure were prepared from nano SiO₂ hydrosol in aqueous phase by a simple chemical process. Nano SiO₂ hydrosol were previously modified with 3-aminopropyl triethoxysilane（APTES） and 3-chloropropyl triethoxysilane（CPTES）, respectively. The APTES and CPTES modified SiO₂ hydrosol were then mixed with different proportions, the SiO₂ nanoparticles coupled to form dumbbell-like particles with a particle size of about 45 nm via the reaction of amine group and chloropropyl groups grafted on the surface of silica. The morphology, structure and chemical performance of SiO₂ nanoparticles were systematically characterized by transmission electron microscopy（TEM）, Fourier transform infrared（FT-IR）, X-ray photoelectron spectroscopy（XPS） and dynamic light scatering（DLS）. As a result, the dumbbell-like SiO₂ nanoparticles with different hydrophilicity on both sides were successfully prepared, and the particle size was approximately equal to the sum of the particle size of APTES modified SiO₂ particles and CPTES modified SiO₂ particles.更多还原