کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
592468 1453905 2015 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evidence of structural reorganization during aggregation of silica nanoparticles
ترجمه فارسی عنوان
شواهد سازماندهی مجدد ساختاری در طول جمع شدن نانوذرات سیلیکا
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
چکیده انگلیسی


• We monitored aggregation of silica particles thanks to turbidity and DLS analyses.
• We developed an optical model to quantitatively interpret the turbidity spectra.
• Analysis of the data evidenced aggregate restructuring.

Silica nanoparticles have been produced by neutralization of sodium silicate. The obtained suspension was unstable because of the high value of the ionic strength of the medium. Aggregation of the particles has been monitored thanks to a combination of in situ turbidity and dynamic light scattering (DLS) measurements. An optical model has been developed to extract both fractal dimension Df and primary particle radius rpp of the formed aggregates from these data. The obtained results clearly indicate a densification of the clusters as aggregation proceeds. A correlation between our experimental turbidity values and hydrodynamic radii was found. Comparison with calculated dimensionless numbers showed that a constant Df could not explain the observed trend. A fractal dimension dependent on the number of particles inside the aggregate Npp is thus suggested.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 468, 5 March 2015, Pages 49–55
نویسندگان
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