کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
231020 1427410 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Fabrication and characterization of titania inverse opals using supercritical carbon dioxide
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Fabrication and characterization of titania inverse opals using supercritical carbon dioxide
چکیده انگلیسی

Titania inverse opals (TIO) with macropores were synthesized via hydrolysis of titanium tetra-isopropoxide (TTIP) in supercritical carbon dioxide (scCO2). Colloidal polystyrene (PS) particles packed in a regular arrangement were used as a template. A mixture of scCO2, TTIP along with ethanol (EtOH) and distilled water was used as an impregnation medium to the voids of PS template. After the sol–gel coating reaction of the titania precursor in the voids and a subsequent thermal treatment, an inverted titania opal structure with high periodicity was obtained. The TIO was characterized by field emission scanning electron microscopy (FE-SEM), Raman spectroscopy and X-ray diffractometry (XRD). From the results of analysis, we conclude that the TIO synthesized in this study have anatase crystalline structure and have mean pore size diameter of 670–700 nm. The change in particle sizes is equivalent to only 2–5% shrinkage from the original PS latex spheres (715 nm). This represents much improved result compared to the products made by other methods where 20–30% shrinkage is common.

Figure optionsDownload as PowerPoint slideHighlights
► Titania inverse opals (TIO) synthesis by using scCO2 investigated.
► Colloidal PS particle was used as a template, titanium tetra-isopropoxide (TTIP), ethanol and water acted as infiltrating reaction materials.
► After the sol–gel coating reaction and subsequent thermal treatment, TIO structure obtained.
► The synthesized TIO have anatase crystalline structure and have mean pore size diameter of 670–700 nm showing only 2–5% shrinkage from the original PS latex spheres (715 nm).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 67, July 2012, Pages 71–75
نویسندگان
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