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research-article

Effects of chemical composition on the electromechanical properties of microfluidically synthesized hydrogel beads

[+] Author and Article Information
Kaushik Kudtarkar

Mechanical Engineering, Rochester Institute of Technology
kak6039@rit.edu

Michael Johnson

Mechanical Engineering, Rochester Institute of Technology
mxj5897@rit.edu

Patricia Iglesias

Member of the ASME, Mechanical Engineering, Rochester Institute of Technology
pxieme@rit.edu

Thomas W. Smith

School of Chemistry and Materials Science, Rochester Institute of Technology
twssch@rit.edu

Michael Schertzer

Member of the ASME, Mechanical Engineering, Rochester Institute of Technology
mjseme@rit.edu

1Corresponding author.

ASME doi:10.1115/1.4039946 History: Received November 21, 2017; Revised April 09, 2018

Abstract

This investigation demonstrates microfluidic synthesis of monodisperse hydrogel beads with controllable electromechanical properties. Hydrogel beads were synthesized using aqueous monomer solutions containing difunctional macromer, ionic liquid monomer, and photoinitiator. Electromechanical properties of these beads were measured at compression ratios up to 20% to examine their potential use in vibrational energy harvesters. Bead stiffness decreased dramatically as water content increased from 19% to 60%. As water content and compression ratio increased, electrical permittivity of beads increased, while resistivity decreased. As ionic liquid monomer concentration increased from 0% to 4%, relative permittivity increased by 30% - 45% and resistivity decreased by 70% - 80%.

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