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Incorporation of Acrylate Based Spiropyran Monoliths in Micro-Fluidic Devices for Photo-Controlled Electroosmotic Flow
conference contribution
posted on 2023-05-23, 05:30 authored by Scarmagnani, S, Walsh, Z, Benito-Lopez, F, Miroslav MackaMiroslav Macka, Brett PaullBrett Paull, Diamond, DSpiropyran 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.
History
Publication title
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 2010Volume
Advances in science and technology v. 76Editors
P VIincenzini, JA Jansen, K Ishihara and TJ WebsterPagination
100-105ISBN
9783908158592Department/School
School of Natural SciencesPublisher
Trans Tech Publications, Ltd.Place of publication
SwitzerlandEvent title
International Ceramics Congress and Forum on New MaterialsEvent Venue
Montecatini Terme, ItalyDate of Event (Start Date)
2010-06-13Date of Event (End Date)
2010-06-18Repository Status
- Restricted