Mechanical Stability of Polystyrene and Janus Particle Monolayers at the Air/Water Interface
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- 作者：Jessica Lenis ; Sepideh Razavi ; Kathleen D. Cao ; Binhua Lin ; Ka Yee C. Lee ; Raymond S. Tu ; Ilona Kretzschmar
- 刊名：Journal of the American Chemical Society
- 出版年：2015
- 出版时间：December 16, 2015
- 年：2015
- 卷：137
- 期：49
- 页码：15370-15373
- 全文大小：317K
- ISSN：1520-5126
文摘
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鈥損article and particle鈥搃nterface 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.