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  Polydopamine layer formation at the liquid-gas interface

Milyaeva, O., Bykov, A., Campbell, R., Loglio, G., Miller, R., & Noskov, B. (2019). Polydopamine layer formation at the liquid-gas interface. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 579: 123637. doi:10.1016/j.colsurfa.2019.123637.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-C813-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-C814-4
Genre: Journal Article

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 Creators:
Milyaeva, O.Yu., Author
Bykov, A.G., Author
Campbell, R.A., Author
Loglio, G., Author
Miller, Reinhard1, Author              
Noskov, B.A., Author
Affiliations:
1Reinhard Miller, Biomaterialien, Max Planck Institute of Colloids and Interfaces, Max Planck Society, ou_1863501              

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Free keywords: Polydopamine, Polymerization, Air-water interface, Dilatational surface visco-elasticity, BAM, Surface ellipsometry
 Abstract: The surface properties of a polydopamine layer at the air-water interface were studied by dilatational surface rheology, ellipsometry and Brewster angle microscopy (BAM). A significant increase of the dynamic surface elasticity was discovered when the concentration changed from 0.75 g/l to 2 g/l with the maximum value of about 60 mN/m at a concentration of 1 g/l. The obtained results indicate that the surface film consists of separate domains and the high surface elasticity is a consequence of the interactions between relatively rigid domains of the polymer film. This conclusion was confirmed by Brewster angle microscopy, which demonstrated different steps of the polydopamine film growth. Separate domains appeared at the first step while one can observe a continuous film close to equilibrium. An increase of the initial concentration led to faster polymerization and to the formation of a thicker film. The dynamic surface elasticity decreased in the concentration range from 2 g/l to 5 g/l when the thickness of the polymer film reached about 80 nm. In this case the film could be destroyed in the course of deformation. The cracks in the film resulted in a decrease of the dynamic surface elasticity.

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 Dates: 2019-07-032019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Degree: -

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Title: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 579 Sequence Number: 123637 Start / End Page: - Identifier: ISSN: 0927-7757