Please use this identifier to cite or link to this item: https://doi.org/10.1039/c6lc01264g
Title: In situ formation of leak-free polyethylene glycol (PEG) membranes in microfluidic fuel cells
Authors: Ho, W.F 
Lim, K.M 
Yang, K.-L 
Keywords: electrolyte
glucose
ion
macrogol
monomer
trypan blue
Article
cross linking
diffusion
electric potential
energy resource
flow rate
hydrogel
membrane
microfluidic fuel cell
microfluidics
molecular weight
priority journal
simulation
Issue Date: 2016
Publisher: Royal Society of Chemistry
Citation: Ho, W.F, Lim, K.M, Yang, K.-L (2016). In situ formation of leak-free polyethylene glycol (PEG) membranes in microfluidic fuel cells. Lab on a Chip 16 (24) : 4725-4731. ScholarBank@NUS Repository. https://doi.org/10.1039/c6lc01264g
Abstract: Membraneless microfluidic fuel cells operated under two co-laminar flows often face serious fuel cross-over problems, especially when flow rates are close to zero. In this study, we show that polyethylene glycol (PEG) monomers can be cross-linked inside microfluidic channels to form leak-free PEG membranes, which prevent mixing of two incompatible electrolyte solutions while allowing diffusion of certain molecules (e.g. glucose) and ions. By using PEG monomers of different molecular weights and cross-linking conditions, we are able to tailor selectivity of the membrane to allow passage of glucose while blocking larger molecules such as trypan blue. As a proof of principle, a microfluidic fuel cell with a PEG membrane and two incompatible electrolytes (acid and base) is demonstrated. Thanks to the leak-free nature of the PEG membrane, these two electrolytes do not mix together even at very slow flow rates. This microfluidic fuel cell is able to generate a voltage up to ∼450 mV from 10 mM of glucose with a flow rate of 20 μL min-1. This microfluidic fuel cell is potentially useful as a miniature power source for many applications. © 2016 The Royal Society of Chemistry.
Source Title: Lab on a Chip
URI: https://scholarbank.nus.edu.sg/handle/10635/174265
ISSN: 14730197
DOI: 10.1039/c6lc01264g
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