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Valve based on novel hydrogels: from synthesis to application


Romero, MR and Arrua, RD and Alvarez Igarzabal, CI and Hilder, EF, Valve based on novel hydrogels: from synthesis to application, Sensors and Actuators B: Chemical: international journal devoted to research and development of physical and chemical transducers, 188 pp. 176-184. ISSN 0925-4005 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier B.V

DOI: doi:10.1016/j.snb.2013.06.086


New hydrogels as materials with potential application in the area of actuators have been developed.Hydrogel synthesis was performed using tris[(hydroxymethyl) methyl]acrylamide (NAT) and itaconicacid (ITA) as monomers and (+)N,N'-diallyltartradiamide (DAT) as crosslinker. The hydrogels NAT–ITAwere prepared using different molar fraction of monomers and characterized by FTIR-ATR, rheology,swelling properties and mechanical force. The hydrogel prepared with 80% and 20% of NAT and ITA,respectively, has the lowest equilibrium swelling ratio (ESR = 16) in water but the highest elastic modulus(10 ± 1 kPa) and strength (2.2 ± 0.1 N h−1). The gel strength increased 0.5 N in a half hour, while the volumeincreased 4 times when passed from an acid medium to a basic medium. This hydrogel was chosen toprepare a pH-sensitive valve to control the flux in a capillary tube. The valve was tested using a systemto control the formation of Fe3+–EDTA complex. The response time was 3 and 15 min to open and closethe valve, respectively. The flow of the solution through the valve was 11 μL min−1. The pressure of the solution during the closing of the valve was 10 kPa. The continuous opening and closing of the valveinvolves repetitive expansion and collapse of the network that could damage the structure of the network.However, the valve produced a reproducible and stable response. The dynamic hydrogen bonding existingin the polymeric chains of NAT–ITA products could assist in the reversible process when the hydrogelswere subjected to repetitive work. The mechanical properties of the gels and self-healing capacity of thenetworks indicated that the products could be applicable in the development of systems for controlleddrug release.

Item Details

Item Type:Refereed Article
Keywords:actuator, microfluidic valve, pH sensitive hydrogel, new materials, itaconic acid
Research Division:Chemical Sciences
Research Group:Analytical chemistry
Research Field:Separation science
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the chemical sciences
UTAS Author:Romero, MR (Dr Marcelo Romero)
UTAS Author:Arrua, RD (Dr Dario Arrua)
UTAS Author:Hilder, EF (Professor Emily Hilder)
ID Code:86952
Year Published:2013
Web of Science® Times Cited:9
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2013-11-04
Last Modified:2017-11-03

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