کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
232335 | 1427482 | 2006 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Organic modification of nano-SiO2 particles in supercritical CO2
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Organic modification of nano-SiO2 particles was performed with supercritical CO2 as solvent and a titanate coupling reagent NDZ-201 as the modification reagent. The surface of the nano-SiO2 particles was changed after modification by the titanate coupling reagent from hydrophilic to hydrophobic. IR and thermo-gravimetric analyses indicate that the interaction between the titanate coupling reagent and the particle surface is mainly through chemical bonding. The influence of the apparent concentration of the titanate coupling reagent on the modification at 60 °C and 20.0 MPa was investigated, in which the apparent concentration is the weight percent of the titanate coupling reagent added in the supercritical solvent. The quantity of the titanate coupling reagent reacted on the particle surface reaches a maximum of 19.81 Ã 10â7 mol/m2, i.e. 1.19 molecule titanate coupling reagent/nm2, when the apparent concentration of titanate coupling reagent is 0.6% (wt).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 37, Issue 1, February 2006, Pages 125-130
Journal: The Journal of Supercritical Fluids - Volume 37, Issue 1, February 2006, Pages 125-130
نویسندگان
Zhi-Wen Wang, Ting-Jie Wang, Zhan-Wen Wang, Yong Jin,