Evolution of radius and light scattering properties of single drying microdroplets of colloidal suspension
| Autor: | G. Derkachov, Mariusz Woźniak, Maciej Kolwas, Daniel Jakubczyk, Krystyna Kolwas, J. Archer |
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| Rok vydání: | 2017 |
| Předmět: |
Radiation
Materials science 010504 meteorology & atmospheric sciences Scanning electron microscope business.industry Colloidal silica Evaporation Analytical chemistry 01 natural sciences Atomic and Molecular Physics and Optics Light scattering Suspension (chemistry) law.invention 010309 optics chemistry.chemical_compound Colloid Optics chemistry law 0103 physical sciences Sodium dodecyl sulfate Crystallization business Spectroscopy 0105 earth and related environmental sciences |
| Zdroj: | Journal of Quantitative Spectroscopy and Radiative Transfer. 202:168-175 |
| ISSN: | 0022-4073 |
| DOI: | 10.1016/j.jqsrt.2017.08.004 |
| Popis: | We report on observation of well-pronounced characteristic features of elastic light scattering of evaporating solution and suspension microdroplet of the anionic surfactant sodium dodecyl sulfate (SDS) and colloidal silica (SiO 2 ) nanospheres in diethylene glycol (DEG) during SDS surface layer and structure formation (crystallization). For pure DEG/SDS solution droplet evaporation process, characteristic evaporation transitions manifested in the evolution of the droplet radius, a ( t ) for all the SDS concentrations (C = 20 mM, 40 mM and 100 mM) studied as well as well-pronounced intensity signals characterizing SDS soft gel-solid transitions for initial SDS concentrations, C > 40 mM. In the case of microdroplets composed of DEG/SDS with controlled addition of colloidal silica, the intensity fluctuations were enhanced and had profiles dependent on the initial composition of the suspension. Exemplary wet droplets at the initial evaporation stages and final dry aggregates of SDS and SDS/SiO 2 were deposited on a substrate and observed with Scanning Electron Microscopy (SEM). Features of the deposited structures correlate well with the elastic scattered light measurements characterizing the drying processes. |
| Databáze: | OpenAIRE |
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