Fabrication of oriented wrinkles on polydopamine/polystyrene bilayer films

Rong Wang; Yuhua Long; Tang Zhu; Jing Guo; Chao Cai; Ning Zhao; Jian Xu

doi:10.1016/j.jcis.2017.03.035

Fabrication of oriented wrinkles on polydopamine/polystyrene bilayer films

J Colloid Interface Sci. 2017 Jul 15:498:123-127. doi: 10.1016/j.jcis.2017.03.035. Epub 2017 Mar 6.

Authors

Rong Wang¹, Yuhua Long², Tang Zhu¹, Jing Guo¹, Chao Cai¹, Ning Zhao³, Jian Xu⁴

Affiliations

¹ Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China.
² Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
³ Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China. Electronic address: [email protected].
⁴ Beijing National Laboratory for Molecular Sciences, Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China. Electronic address: [email protected].

PMID: 28324717
DOI: 10.1016/j.jcis.2017.03.035

Abstract

Wrinkles exist widely in nature and our life. In this paper, wrinkles on polydopamine (PDA)/polystyrene (PS) bilayer films were formed by thermal annealing due to the different thermal coefficients of expansion of each layer. The factors that influenced the dimensions of wrinkles were studied. We found that oriented wrinkles could be formed if the bilayer films were patterned with micro-grooves, and the degree of the orientation depended on the thickness of the PDA and the dimensions of the grooves. Combined with the strong adhesion, biocompatibility and reactivity of PDA, the oriented wrinkles on PDA/PS patterned bilayers may find potential application in diffraction gratings, optical sensors and microfluidic devices.

Keywords: Orientation; Polydopamine; Polystyrene; Thermal anneal; Wrinkle.