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Interfacial rheology of an ultrathin nanocrystalline film formed at the liquid/liquid interface.
- Source :
-
Langmuir : the ACS journal of surfaces and colloids [Langmuir] 2007 Mar 13; Vol. 23 (6), pp. 3084-7. Date of Electronic Publication: 2007 Feb 15. - Publication Year :
- 2007
-
Abstract
- We report the interfacial properties of monolayers of Ag nanoparticles 10-50 nm in diameter formed at the toluene-water interface under steady as well as oscillatory shear. Strain amplitude sweep measurements carried out on the film reveal a shear thickening peak in the loss moduli (G") at large amplitudes followed by a power law decay of the storage (G') and loss moduli with exponents in the ratio 2:1. In the frequency sweep measurements at low frequencies, the storage modulus remains nearly independent of the angular frequency, whereas G" reveals a power law dependence with a negative slope, a behavior reminiscent of soft glassy systems. Under steady shear, a finite yield stress is observed in the limit of shear rate .gamma going to zero. However, for .gamma > 1 s-1, the shear stress increases gradually. In addition, a significant deviation from the Cox-Merz rule confirms that the monolayer of Ag nanoparticles at the toluene-water interface forms a soft two-dimensional colloidal glass.
Details
- Language :
- English
- ISSN :
- 0743-7463
- Volume :
- 23
- Issue :
- 6
- Database :
- MEDLINE
- Journal :
- Langmuir : the ACS journal of surfaces and colloids
- Publication Type :
- Academic Journal
- Accession number :
- 17300211
- Full Text :
- https://doi.org/10.1021/la063236a