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https://hdl.handle.net/2440/75799
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Type: | Journal article |
Title: | Thermosensitive copolymer coatings with enhanced wettability switching |
Author: | Kurkuri, M. Nussio, M. Deslandes, A. Voelcker, N. |
Citation: | Langmuir: the ACS journal of surfaces and colloids, 2008; 24(8):4238-4244 |
Publisher: | Amer Chemical Soc |
Issue Date: | 2008 |
ISSN: | 0743-7463 1520-5827 |
Statement of Responsibility: | Mahaveer D. Kurkuri, Matthew R. Nussio, Alec Deslandes, and Nicolas H. Voelcker |
Abstract: | Expanded cross-linked copolymers of poly(N-isopropylacrylamide) (PNiPAAm) and poly(acrylic acid) (PAAc) of varying monomer ratios were grafted from a crystalline silicon surface. Surface-tethered polymerization was performed at a slightly basic pH, where electrostatic repulsion among acrylic acid monomer units forces the network into an expanded polymer conformation. The influence of this expanded conformation on switchability between a hydrophilic and a hydrophobic state was investigated. Characterization of the copolymer coating was carried out by means of X-ray photoelectron spectroscopy (XPS) ellipsometry, and diffuse reflectance IR. Lower critical solution temperatures (LCSTs) of the copolymer grafts on the silicon surfaces were determined by spectrophotometry. Temperature-induced wettability changes were studied using sessile drop contact angle measurements. The surface topography was investigated by atomic force microscopy (AFM) in Milli-Q water at 25 and 40 degrees C. The reversible attachment of a fluorescently labeled model protein was studied as a function of temperature using a fluorescence microscope and a fluorescence spectrometer. Maximum switching in terms of the contact angle change around the LCST was observed at a ratio of 36:1 PNiPAAm to PAAc. The enhanced control of biointerfaces achieved by these coatings may find applications in biomaterials, biochips, drug delivery, and microfluidics. |
Keywords: | Polymers Solutions Microscopy, Fluorescence Microscopy, Atomic Force Spectrum Analysis Temperature Wettability |
Rights: | © 2008 American Chemical Society |
DOI: | 10.1021/la703668s |
Published version: | http://dx.doi.org/10.1021/la703668s |
Appears in Collections: | Aurora harvest 4 Chemical Engineering publications |
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