Journal
MOLECULAR PHYSICS
Volume 109, Issue 7-10, Pages 1057-1066Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00268976.2010.542778
Keywords
nanoparticle monolayers; contact angle; surface rheology; foams
Funding
- Sino-French Doctor's Institutes from CSC (China Scholarship Council)
- Laboratoire de Physique des Solides
- CNES
- ESA
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We have studied the properties (surface pressure, compression and shear moduli, texture) of silica nanoparticle layers at the air-water interface. Particle hydrophobicity or, equivalently, the contact angle between particles, air and water, is the main factor that influences surface organization and surface elastic moduli. The surface layers are denser for particles of higher hydrophobicity. The compression and shear moduli, as well as the yield and melt strains, present a maximum for contact angles around 90 degrees. The dependence of the mechanical properties on particle hydrophobicity is closely related to the foamability and stability of the foams made from dispersions.
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