Sodium dodecyl sulfate microaggregates with diversely developed surfaces: Formation from free microdroplets of colloidal suspension

Justice Archer, Maciej Kolwas, Mariusz Wozniak, Daniel Jakubczyk, Krystyna Kolwas, Gennadiy Derkachov, Tomasz Wojciechowski

Research output: Contribution to journalArticle (Academic Journal)peer-review

2 Citations (Scopus)
148 Downloads (Pure)

Abstract

Unsupported drying of microdroplets of colloidal suspension can lead to the formation of complex micro-morphologies with quasi-spherical symmetry. Herein, drying of levitating microdroplets of suspension of SiO2 nanospheres in diethylene glycol (DEG) with sodium dodecyl sulfate (SDS) is reported as a method for producing such microstructures with diversely developed surfaces. Dried products are “soft-landed” on a substrate and studied with scanning electron microscopy (SEM). The smallest SDS/SiO2 composites with the surface formed of crystallised SDS and interior filled with SiO2 nanospheres preserve the spherical symmetry. Larger microdroplets with higher initial mass fractions of SDS dry up to developed microstructures with SiO2 nanospheres arranged in-between the crystallised SDS flakes which are similar to curved lobe cabbage leaves or “desert rose”-like structures with radially directed SDS crystals. Largest microdroplets with highest initial mass fractions of SDS formed doughnut-shaped micro-containers filled with aggregated SiO2 nanospheres. In all these, SiO2 nanospheres served as a frame for the SDS crystallisation.
Original languageEnglish
Article number39
Number of pages12
JournalEuropean Physical Journal Plus
Volume134
Issue number1
Early online date28 Jan 2019
DOIs
Publication statusE-pub ahead of print - 28 Jan 2019

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