Kim Tae Hee, Lee Kwang Hee, Kwon Yong Ku
Department of Polymer Science and Engineering, Inha University, Incheon 402-751, Republic of Korea.
J Colloid Interface Sci. 2006 Dec 15;304(2):370-7. doi: 10.1016/j.jcis.2006.08.059. Epub 2006 Sep 7.
Titania-coated polymeric nanoparticles were synthesized based on the cationic colloidal particles which were prepared by surfactant-free emulsion copolymerization of styrene and butylacrylate in the presence of a cationic monomer, methacryloxyethyltrimethyl ammonium chloride (MOTAC) using azobis(isobutylamidine)hydrochloride (AIBA) as an initiator. These cationic particles were stabilized by poly(vinylpyrrolidone) (PVP). Then, these particles were dispersed in ethanol and mixed with titanium(IV) butoxide. Negatively charged titania precursors were rapidly hydrolyzed onto the cationic surfaces of colloidal particles. Subsequently, the samples were heated to 450 degrees C to form anatase TiO2 and to remove the colloidal template, which resulted in hollow nanospheres. The hollow titania particles were characterized with zeta analyzer, transmission electron microscopy, scanning electron microscopy, light scattering, X-ray diffraction, thermogravimetric analysis and FT-IR.
基于阳离子胶体颗粒合成了二氧化钛包覆的聚合物纳米颗粒，这些阳离子胶体颗粒是通过在阳离子单体甲基丙烯酰氧乙基三甲基氯化铵（MOTAC）存在下，以偶氮二（异丁脒）盐酸盐（AIBA）为引发剂，使苯乙烯和丙烯酸丁酯进行无表面活性剂乳液共聚制备的。这些阳离子颗粒由聚乙烯吡咯烷酮（PVP）稳定。然后，将这些颗粒分散在乙醇中并与丁醇钛混合。带负电荷的二氧化钛前体迅速水解到胶体颗粒的阳离子表面上。随后，将样品加热至450℃以形成锐钛矿型TiO₂并去除胶体模板，从而得到中空纳米球。通过zeta分析仪、透射电子显微镜、扫描电子显微镜、光散射、X射线衍射、热重分析和傅里叶变换红外光谱对中空二氧化钛颗粒进行了表征。
