Reversible Chemo‐Topographic Control of Adhesion in Polydopamine Nanomembranes
Abstract
The use of polydopamine nanomembranes as a conformal coating with reversible adhesion is demonstrated. Here, two approaches to achieve reversible adhesion in polydopamine nanomembranes are reported: 1) controlling the surface chemistry using pH and 2) altering the texture through mechanical strain. pH‐dependent reversible adhesion in an aqueous environment can achieve differential pull‐off force of ≈0 and 1.93 ± 0.39 mN. Strain‐dependent adhesion in dry environments can produce between 0.26 ± 0.04 and 1.48 ± 0.06 mN, a range of 5.7 times difference. A theoretical framework based on elliptical Johnson–Kendall–Roberts theory to describe the relation between adhesion and the sinusoidal microtexture geometry is proposed. This model is in good agreement with experimentally determined values for interfacial adhesion in dry environments.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 13, 2018
- Source ID
- 10.1002/mame.201800258
Entities
People
- Christopher J. Bettinger
- Guannan Tang
- Ik Soo Kwon
- Po‐ju Chiang
- Sophia Eristoff
Organizations
- Carnegie Mellon University
- Defense Advanced Research Projects Agency
- National Institutes of Health
- National Science Foundation