Quantification of the Structure of Colloidal Gas–Liquid Interfaces

We have quantified the structure of the colloidal gas–liquid interface using synchrotron X-ray reflectivity measurements on a model colloid–polymer mixture. The interfacial width shows mean-field scaling with the colloid density difference, and the density profiles appear to be monotonic. Furthermor...

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Bibliographic Details
Published in:The journal of physical chemistry letters 2020-10, Vol.11 (19), p.8372-8377
Main Authors: Vis, Mark, Brouwer, Kelly J. H, González García, Álvaro, Petukhov, Andrei V, Konovalov, Oleg, Tuinier, Remco
Format: Article
Language:English
Subjects:
Chemical Sciences
Letter
Physical Insights into Chemistry, Catalysis, and Interfaces
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Summary:We have quantified the structure of the colloidal gas–liquid interface using synchrotron X-ray reflectivity measurements on a model colloid–polymer mixture. The interfacial width shows mean-field scaling with the colloid density difference, and the density profiles appear to be monotonic. Furthermore, our measurements allow us to distinguish between different theoretical polymer descriptions commonly used to model colloid–polymer mixtures. Our results highlight the importance of capturing the correct polymer physics in obtaining a quantitative theoretical description of the colloidal gas–liquid interface.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.0c02464