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    A low-cost, composite collagen-PDMS material for extended fluid retention in the skin-interfaced microfluidic devices

    Year: 2020

    Journal: Colloid Interface Sci. Commun., Volume 38, SEP

    Authors: Heo, Benjamin; Fiola, Michael; Yang, Ji Hyun; Koh, Ahyeon

    Organizations: Small-Scale Systems Integration and Packaging (S3IP) Center of Excellence; SUNY Binghamton Start-Up funds; Air Force Research Laboratory [FA8650-18-2-5402]

    Keywords: Collagen microparticle; PDMS composite; Water permeability; Sweat collection

    The advancement of soft, wearable microfluidic devices relies on the microfabrication of polydimethylsiloxane (PDMS) using soft lithography techniques. However, thin 3D microstructures made of PDMS limit long-term storage of aqueous samples and reduce the accuracy of onboard sensing modalities within the platform because of the material's high permeation of water vapor. We studied a composite material of collagen microparticles and PDMS that greatly reduces water evaporation while maintaining the properties of a soft elastomer required for skin-interfaced microfluidics. The collagen-PDMS material is biocompatible, affordable, and non-toxic. We re-duced permeability by 80.2% by building a film containing 30 wt% collagen microparticles. Mechanical prop-erties, such as elastic modulus and bonding efficacy, can vary as a function of particle concentration in the films. The skin-interfaced collagen-PDMS microfluidic devices increase sweat retention by 45% through 9 h compared with pure PDMS. This material can greatly improve the long-term sample storage of epidermal devices.
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