Paschalidou Polyxeni, Theocharis Charis R
Porous Solids Group, Department of Chemistry, University of Cyprus P. O. Box 20537 1678 Nicosia Cyprus
RSC Adv. 2018 Aug 23;8(52):29890-29898. doi: 10.1039/c8ra05495a. eCollection 2018 Aug 20.
Nanoporous titania was prepared from non-ionic surfactant reverse micelles ( Triton-X) and the effects of the chain length of the surfactants and calcination temperature of the precursor gels on the surface properties of the product (mesoporous titania) were investigated. The studies included sample characterization of the precursor gels from the titania samples characterized by UV-Vis, ATR-FTIR, XRD, TGA/DSC and the titania samples by N-adsorption BET, XRD, FT-IR, UV-Vis diffuse reflectance and SEM measurements after calcination at 400 °C, 500 °C, 600 °C, 700 °C and 800 °C. According to the experimental results, generally increasing the length of the polar tail of Triton-X results in an increased specific surface area and volume, and an average pore diameter of the solids. Moreover, increasing the length of the polar tail is associated with a smaller crystallite size and higher thermal stability of the materials. Finally, a nucleation mechanism of the titania particles within the aqueous centre of the reversed micelles is proposed.
采用非离子表面活性剂反胶束（Triton-X）制备了纳米多孔二氧化钛，并研究了表面活性剂链长和前驱体凝胶煅烧温度对产物（介孔二氧化钛）表面性质的影响。研究内容包括通过紫外可见光谱（UV-Vis）、衰减全反射傅里叶变换红外光谱（ATR-FTIR）、X射线衍射（XRD）、热重/差示扫描量热法（TGA/DSC）对二氧化钛样品的前驱体凝胶进行表征，以及在400℃、500℃、600℃、700℃和800℃煅烧后，通过N2吸附BET、XRD、傅里叶变换红外光谱（FT-IR）、紫外可见漫反射和扫描电子显微镜（SEM）测量对二氧化钛样品进行表征。根据实验结果，一般来说，增加Triton-X极性尾部的长度会导致固体的比表面积、体积和平均孔径增加。此外，增加极性尾部的长度与材料较小的微晶尺寸和较高的热稳定性有关。最后，提出了反胶束水相中二氧化钛颗粒的成核机制。
