Shanghai Advanced Research Institute , Chinese Academy of Sciences, Shanghai, China 201210.
Langmuir. 2013 Dec 10;29(49):15275-82. doi: 10.1021/la403269u. Epub 2013 Nov 27.
Silanization of magnetic ironoxide nanoparticles with (3-aminopropyl)triethoxylsilane (APTES) is reported. The kinetics of silanization toward saturation was investigated using different solvents including water, water/ethanol (1/1), and toluene/methanol (1/1) at different reaction temperature with different APTES loading. The nanoparticles were characterized by Fourier transform infrared spectroscopy, vibrating sample magnetometry, transmission electron microscopy, and thermal gravimetric analysis (TGA). Grafting density data based on TGA were used for the kinetic modeling. It is shown that initial silanization takes place very fast but the progress toward saturation is very slow, and the mechanism may involve adsorption, chemical sorption, and chemical diffusion processes. The highest equilibrium grafting density of 301 mg/g was yielded when using toluene/methanol mixture as the solvent at a reaction temperature of 70 °C.
本文报道了（3-氨丙基）三乙氧基硅烷（APTES）对磁性氧化铁纳米粒子的硅烷化。通过在不同的反应温度下，使用不同的溶剂（包括水、水/乙醇（1/1）和甲苯/甲醇（1/1））和不同的 APTES 负载量，研究了硅烷化达到饱和的动力学。通过傅里叶变换红外光谱、振动样品磁强计、透射电子显微镜和热重分析（TGA）对纳米粒子进行了表征。基于 TGA 的接枝密度数据用于动力学建模。结果表明，初始硅烷化反应非常迅速，但达到饱和的速度非常缓慢，该过程可能涉及吸附、化学吸附和化学扩散过程。当使用甲苯/甲醇混合物作为溶剂，并在 70°C 的反应温度下，得到了最高的平衡接枝密度 301mg/g。
