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Incorporation of Acrylate Based Spiropyran Monoliths in Micro-Fluidic Devices for Photo-Controlled Electroosmotic Flow

Citation

Scarmagnani, S and Walsh, Z and Benito-Lopez, F and Macka, M and Paull, B and Diamond, D, Incorporation of Acrylate Based Spiropyran Monoliths in Micro-Fluidic Devices for Photo-Controlled Electroosmotic Flow, Medical applications of novel biomaterials and nano-biotechnology : 5th Forum on New Materials, Part E : proceedings of the 5th Forum on New Materials, part of CIMTEC 2010, 13-18 June 2010, Montecatini Terme, Italy, pp. 100-105. ISBN 9783908158592 (2010) [Refereed Conference Paper]

DOI: doi:10.4028/www.scientific.net/AST.76.100

Abstract

Spiropyran photochromic compounds can be switched using light exposure between a non-polar spiro form (SP) and a zwitterionic merocyanine form (MC) that is subject to protonation (MC-H+). It has recently been demonstrated by Walsh et al. that, under acidic conditions, electroosmotic flow (EOF) generated in vinyl based spiropyran monoliths can be modulated using light irradiation [1]. In this paper, we report a spiropyran-modified acrylate based monolith which is particularly sensitive to protonation in the MC form, producing a positively charged surface that converts to the unpolar SP form by exposure to white light. When the MC-H+ form is dominant, it produces a charged surface which enables a relatively high flow rate (up to 1.6 μl/min) to be generated under electroosmotic conditions. Upon exposure to white light, the concentration of MC-H+ decreases due to the photo-conversion to the uncharged SP form, with up to 20% reduction of the EOF. The process is reversible, and removal of the light source results in a flow increase back to the original rate. The ability to alter flow rates in micro-fluidic channels using light has very significant implications, as it could dramatically simplify the manner in which micro-flow systems are controlled.

Item Details

Item Type:Refereed Conference Paper
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Flow Analysis
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Macka, M (Professor Mirek Macka)
Author:Paull, B (Professor Brett Paull)
ID Code:72040
Year Published:2010
Deposited By:Research Division
Deposited On:2011-08-18
Last Modified:2015-01-21
Downloads:0

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