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Micromachines 2014, 5(3), 515-527; doi:10.3390/mi5030515

A Contact Angle Study of the Interaction between Embedded Amphiphilic Molecules and the PDMS Matrix in an Aqueous Environment

1
Department of Engineering Sciences, The Angstrom Laboratory, Uppsala University, S-75105 Uppsala, Sweden
2
School of Mechanical & Electronic Engineering, Wuhan University of Technology, Wuhan 430070, China
*
Author to whom correspondence should be addressed.
Received: 16 April 2014 / Revised: 3 August 2014 / Accepted: 4 August 2014 / Published: 7 August 2014
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Abstract

Poly(dimethylsiloxane) (PDMS) surface modification via gradient-induced transport of embedded amphiphilic molecules is a novel, easy, flexible, and environmentally friendly approach for reducing protein adsorption on PDMS in microfluidic applications. To better understand the processing and the potential use in the viability-sensitive applications such as manipulation and culturing of primary neural cells, we systematically investigate how embedded molecules interact with a PDMS matrix and its surface in aqueous environments by studying the wetting angle over time under various processing conditions, including water exposure time, water exposure temperature, curing master materials, in addition to comparing different embedded amphiphilic molecules. The results indicate that the water exposure time clearly plays an important role in the surface properties. Our interpretation is that molecular rearrangement of the surface-embedded molecules improves surface coverage in the short term; while over a longer period, the transport of molecules embedded in the bulk enhance its coverage. However, this improvement finally terminates when molecules transported from the bulk to the surface are not sufficient to replace the molecules leaching into the water. View Full-Text
Keywords: gradient-induced transport; PDMS surface modification; embedded amphiphilic molecules gradient-induced transport; PDMS surface modification; embedded amphiphilic molecules
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Qiu, W.; Sun, X.; Wu, C.; Hjort, K.; Wu, Z. A Contact Angle Study of the Interaction between Embedded Amphiphilic Molecules and the PDMS Matrix in an Aqueous Environment. Micromachines 2014, 5, 515-527.

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