Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 11, Issue 41, Pages 9522-9529Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b907903c
Keywords
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Funding
- China Scholarship Council
- Laboratoire de Physique des Solides
- Universite Paris XI and Northwestern Polytechnical University
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We have studied silica nanoparticle layers spread at the air/water interface. The surface pressure of the layers has been determined in a Langmuir trough via two orthogonal Wilhelmy plates. We observed significant differences in surface pressure according to the preparation protocol: layers spread then compressed or layers obtained after successive spreading steps. We also studied the two types of layers by multiple angle of incidence ellipsometry. We introduce a two-layer model which enables us to evaluate the radius of interfacial aggregates and their contact angle with the air/water interface.
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