کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7610230 | 1493488 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Size determination and quantification of engineered cerium oxide nanoparticles by flow field-flow fractionation coupled to inductively coupled plasma mass spectrometry
ترجمه فارسی عنوان
تعیین اندازه و اندازه گیری نانوذرات اکسید سریم مهندسی توسط تقسیم بندی جریانی جریان جوی به همراه اسپکترومتر جرم پلاسما همراه با القایی
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کلمات کلیدی
نانوذرات اکسید سریم، مشخصه اندازه، کوانتومی، جابجایی میدان جریان-تقسیم، اسپکترومتر جرم پلاسما همراه با انعکاس، پایداری تعلیق،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
چکیده انگلیسی
Facing the lack of studies on characterization and quantification of cerium oxide nanoparticles (CeO2 NPs), whose consumption and release is greatly increasing, this work proposes a method for their sizing and quantification by Flow Field-flow Fractionation (FFFF) coupled to Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). Two modalities of FFFF (Asymmetric Flow- and Hollow Fiber-Flow Field Flow Fractionation, AF4 and HF5, respectively) are compared, and their advantages and limitations discussed. Experimental conditions (carrier composition, pH, ionic strength, crossflow and carrier flow rates) are studied in detail in terms of NP separation, recovery, and repeatability. Size characterization of CeO2 NPs was addressed by different approaches. In the absence of feasible size standards of CeO2 NPs, suspensions of Ag, Au, and SiO2 NPs of known size were investigated. Ag and Au NPs failed to show a comparable behavior to that of the CeO2 NPs, whereas the use of SiO2 NPs provided size estimations in agreement to those predicted by the theory. The latter approach was thus used for characterizing the size of CeO2 NPs in a commercial suspension. Results were in adequate concordance with those achieved by transmission electron microscopy, X-ray diffraction and dynamic light scattering. The quantification of CeO2 NPs in the commercial suspension by AF4-ICP-MS required the use of a CeO2 NPs standards, since the use of ionic cerium resulted in low recoveries (99 ± 9% vs. 73 ± 7%, respectively). A limit of detection of 0.9 μg Lâ1 CeO2 corresponding to a number concentration of 1.8 Ã 1012 Lâ1 for NPs of 5 nm was achieved for an injection volume of 100 μL.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1438, 18 March 2016, Pages 205-215
Journal: Journal of Chromatography A - Volume 1438, 18 March 2016, Pages 205-215
نویسندگان
L. Sánchez-GarcÃa, E. Bolea, F. Laborda, C. Cubel, P. Ferrer, D. Gianolio, I. da Silva, J.R. Castillo,