Issue 10, 2024

Using cryo-SEM and EDS to investigate the stabilisation of oil–water interfaces in mixed aqueous-and-oil foams

Abstract

For multi-phase soft matter systems, optical microscopy is frequently employed to distinguish the different phases. Unfortunately, optical microscopy does not succeed in all cases. Consequently, researchers sometimes require more advanced imaging techniques with superior resolution or sample penetration capabilities. One such complex system is a mixed aqueous-and-oil foam stabilised by colloidal particles, which is composed of two immiscible foams organised as the dispersed and continuous phases of an emulsion. While its morphology has been extensively studied using fluorescence confocal microscopy, not all questions have been answered. While the aqueous phase bubble interfaces are stabilised by silica particles and the oil phase bubble interfaces are stabilised by fluorinated particles, it remains to be seen how the aqueous–oil interfaces are stabilised. Hence, to gain insights into the role of the different particles at the interfaces, we employ cryogenic scanning electron microscopy (Cryo-SEM) and energy-dispersive X-ray spectroscopy (EDS). We find that the hydrophobic silica particles reside at both the aqueous–air and aqueous–oil interfaces. In contrast, the fluorinated particles, which exhibit hydrophobic and oleophobic properties simultaneously, are exclusively found at the oil–air interfaces.

Graphical abstract: Using cryo-SEM and EDS to investigate the stabilisation of oil–water interfaces in mixed aqueous-and-oil foams

Supplementary files

Article information

Article type
Communication
Submitted
14 Dec 2023
Accepted
07 Feb 2024
First published
08 Feb 2024
This article is Open Access
Creative Commons BY license

Soft Matter, 2024,20, 2212-2217

Using cryo-SEM and EDS to investigate the stabilisation of oil–water interfaces in mixed aqueous-and-oil foams

Y. Si, F. H. J. Laidlaw, T. Li and P. S. Clegg, Soft Matter, 2024, 20, 2212 DOI: 10.1039/D3SM01699D

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