کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9749133 | 1493802 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Characterization of a new stationary phase based on microwave immobilized polybutadiene on titanium oxide-modified silica
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Titanium oxide-modified silica was prepared by reaction of silica with titanium tetrabutoxide and then was used as support in the preparation of stationary phases with self-immobilized polybutadiene (PBD) and PBD immobilized through microwave radiation. Chromatographic performance of the stationary phases was evaluated in terms of the efficiency (plates/m), asymmetry (As), retention factor (k) and resolution (Rs) of two standard sample mixtures, one of then containing the basic compound N,N-dimethylaniline. A microwave irradiation of 30Â min at 520Â W gave the best efficiency (86,500Â NÂ mâ1), greater than that of a 6-day self immobilized phase (69,500Â NÂ mâ1). Self-immobilized stationary phases prepared with bare silica were also studied for comparison. These resulted in lower chromatographic performance, 43,800Â NÂ mâ1, when compared to the self-immobilized phase prepared with titanized silica.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1073, Issues 1â2, 6 May 2005, Pages 127-135
Journal: Journal of Chromatography A - Volume 1073, Issues 1â2, 6 May 2005, Pages 127-135
نویسندگان
Lais S.R. Morais, Isabel C.S.F. Jardim,