具有双亲特性的水相哑铃型SiO_(2)纳米粒子的制备

Synthesis of Dumbbell-like SiO_(2) Nanoparticles with Amphiphilic Properties in Aqueous Phase

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。

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.