Premium
Reversible Chemo‐Topographic Control of Adhesion in Polydopamine Nanomembranes
Author(s) -
Chiang PoJu,
Tang Guannan,
Kwon Ik Soo,
Eristoff Sophia,
Bettinger Christopher J.
Publication year - 2018
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201800258
Subject(s) - adhesion , materials science , aqueous solution , coating , nanotechnology , composite material , chemical engineering , chemistry , engineering
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.