کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7609444 1493398 2017 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Explicit role of ionic strength in retention behavior of polystyrene latex particles in sedimentation field-flow fractionation: Slip boundary model
ترجمه فارسی عنوان
نقش صریح قدرت یونی در رفتار نگهداری ذرات لاتکس پلی استایرن در تقسیم بندی جریانی جریان رسوب: مدل مرزی لغزش
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
We investigate an explicit role of the ionic strength in the retention behaviors of polystyrene (PS) latex particles in sedimentation field-flow fractionation (SdFFF) by hinging upon the retention theory recently developed [1] asR=(Ro+vb*)/(1+vb*). Here R is an experimental retention ratio, and Ro is the analytical expression of the standard retention theory based on the parabolic flow velocity. The reduced boundary velocityvb* is expressed in terms of the ionic strength I of the carrier liquid as vb*=vb,o*/(1+εI), where vb,o*=0.070and ε = 60 mM−1 for all the PS latex systems under investigation. We then apply this to study the explicit ionic strength effect on the retention behaviors of PS beads of 200, 300, 400, and 500 nm, respectively. As a primary result, the strong dependence of the retention ratio on the ionic strength can be quantitatively accounted for in an excellent accuracy: The slip effect at the channel surface is significant, particularly when I ≲ 0.5 mM, without showing any distinguishable dependence on the specific additives to control I, such as FL-70, SDS, NaNO3, and NaN3. Based on the present study, we put forward an experimental means to estimate the ionic strength of an aqueous solution using an FFF technique.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1528, 15 December 2017, Pages 75-82
نویسندگان
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