ISSN 0914-4935

Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Sulfobetaine Polymers toward Application of Polydimethylsiloxane (PDMS) Surface Modification

Mutsuo Tanaka, Yoshikatsu Ogawa, Yoshiki Hirata, Takahiro Sawaguchi, and Shigeru Kurosawa

(Received June 29, 2018; Accepted August 22, 2018)

Keywords: surface modification, sulfobetaine, polymer, polydimethylsiloxane

The surface modification of the polydimethylsiloxane (PDMS) elastomer was studied to obtain a durable hydrophilic surface leading to the reduction in surface tension with an aqueous solution for micro flow channel application. Among hydrophilic polymers, it was found that a zwitterionic polymer, sulfobetaine polymer, was adsorbed strongly on the PDMS surface treated with air plasma to afford a durable hydrophilic surface. The PDMS surface treated with air plasma is known to be a silica-like surface with negative charge, and electrostatic interaction, namely, polyion complex interaction between the sulfobetaine polymer and the treated PDMS surface, was sufficiently strong to maintain hydrophilicity even after heat treatment. Furthermore, cell culture experiments showed that the influence of the sulfobetaine polymer on cell growth was negligible, similar to 2-methacryloyloxyethyl phophoryl choline (MPC) polymer, which is a common polymer for biomedical application. The observation of the PDMS surface modified with the sulfobetaine polymer by AFM suggested that the thickness of the sulfobetaine polymer film was very thin with nm-order, therefore, this modification method can hold a micro flow channel in its form. These results demonstrated that the sulfobetaine polymer could be a promising material for the surface modification of the PDMS micro flow channel for biomedical applications.

Corresponding author: Mutsuo Tanaka




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