title: Nanomechanics of Poly(catecholamine) Coatings in Aqueous Solutions.
abstract: Mussel-inspired self-polymerized catecholamine coatings have been widely utilized as a versatile coating strategy that can be applied to a variety of substrates. For the first time, nanomechanical measurements and an evaluation of the contribution of primary amine groups to poly(catecholamine) coatings have been conducted using a surface-forces apparatus. The adhesive strength between the poly(catecholamine) layers is 30-times higher than that of a poly(catechol) coating. The origin of the strong attraction between the poly(catecholamine) layers is probably due to surface salt displacement by the primary amine, π-π stacking (the quadrupole-quadrupole interaction of indolic crosslinks), and cation-π interactions (the monopole-quadrupole interaction between positively charged amine groups and the indolic crosslinks). The contribution of the primary amine group to the catecholamine coating is vital for the design and development of mussel-inspired catechol-based coating materials.
authors.affiliation: School of Interdisciplinary Bioscience and Bioengineering, Division of Integrative Biosciences and Biotechnology, School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea.
authors.forename: Chanoong
authors.initials: C
authors.lastname: Lim
authors.affiliation: Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada.
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.affiliation: Department of Chemistry, Graduate School of Nanoscience and Technology (WCU) and KAIST institute NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea.
authors.forename: Sunjin
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Chemistry, Graduate School of Nanoscience and Technology (WCU) and KAIST institute NanoCentury, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea. haeshin@kaist.ac.kr.
authors.forename: Haeshin
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2V4, Canada. hongbo.zeng@ualberta.ca.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Zeng
authors.affiliation: School of Interdisciplinary Bioscience and Bioengineering, Division of Integrative Biosciences and Biotechnology, School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea. dshwang@postech.ac.kr.
authors.forename: Dong Soo
authors.identifier: http://orcid.org/0000-0002-2487-2255
authors.initials: DS
authors.lastname: Hwang
mesh_terms: D020099:Coated Materials, Biocompatible; D056951:Photoelectron Spectroscopy; D012996:Solutions; D013499:Surface Properties; D014867:Water
chemical_list: D020099:Coated Materials, Biocompatible; D012996:Solutions; D014867:Water
keywords: adhesive strength; catecholamine; cation-π interaction; coatings; π interactions