Journal article
Interfacial Dynamics and Rheology of Polymer-Grafted Nanoparticles at Air-Water and Xylene-Water Interfaces
Langmuir, v 28(21), pp 8052-8063
29 May 2012
PMID: 22548709
Abstract
Particle-stabilized emulsions and foams offer a number of advantages over traditional surfactant-stabilized systems, most notably a greater stability against coalescence and coarsening. Nanoparticles are often less effective than micrometer-scale colloidal particles as stabilizers, but nanoparticles grafted with polymers can be particularly effective emulsifiers, stabilizing emulsions for long times at very low concentrations. In this work, we characterize the long-time and dynamic interfacial tension reduction by polymer-grafted nanoparticles adsorbing from suspension and the corresponding dilatational moduli for both xylene-water and air-water interfaces. The dilatational moduli at both types of interfaces are measured by a forced sinusoidal oscillation of the interface. Surface tension measurements at the air-water interface are interpreted with the aid of independent ellipsometry measurements of surface excess concentrations. The results suggest that the ability of polymer-grafted nanoparticles to produce significant surface and interfacial tension reductions and dilatational moduli at very low surface coverage is a key factor underlying their ability to stabilize Pickering emulsions at extremely low concentrations.
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Details
- Title
- Interfacial Dynamics and Rheology of Polymer-Grafted Nanoparticles at Air-Water and Xylene-Water Interfaces
- Creators
- Nicolas J. Alvarez - Carnegie Mellon UniversityShelley L. Anna - Carnegie Mellon UniversityTrishna Saigal - Carnegie Mellon UniversityRobert D. Tilton - Carnegie Mellon UniversityLynn M. Walker - Carnegie Mellon University
- Publication Details
- Langmuir, v 28(21), pp 8052-8063
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 12
- Grant note
- CBET-1033814; CBET-0729967 / National Science Foundation; National Science Foundation (NSF) 17430AC7 / American Chemical Society
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000304492700014
- Scopus ID
- 2-s2.0-84861616168
- Other Identifier
- 991019292134304721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary