Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 137, Issue 49, Pages 15370-15373Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.5b10183
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Funding
- National Science Foundation [CBET-1067501]
- MRSEC program at the University of Chicago [DMR-0820054, DMR-1420709]
- NSF PREM program [DMR-0934206]
- NSF [MCB-1413613]
- AFOSR [FA9550-14-1-0263]
- ChemMat CARS - NSF [CHE-1346572]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1346572] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0934206] Funding Source: National Science Foundation
- Div Of Molecular and Cellular Bioscience
- Direct For Biological Sciences [1413613] Funding Source: National Science Foundation
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The compressional instability of particle-laden air/water interfaces is investigated with plain and surface-anisotropic (Janus) particles. We hypothesize that the amphiphilic nature of Janus particles leads to both anisotropic particle particle and particle interface interactions that can yield particle films with unique collapse mechanisms. Analysis of Langmuir isotherms and microstructural characterization of the homogeneous polystyrene particle films during compression reveal an interfacial buckling instability followed by folding, which is in good agreement with predictions from classical elasticity theory. In contrast, Janus particle films exhibit a different behavior during compression, where the collapse mode occurs through the subduction of the Janus particle film. Our results suggest that particle-laden films comprised of surface-anisotropic particles can be engineered to evolve new material properties.
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