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    Leveraging Arylboronic Acid-Cellulose Binding as a Versatile and Scalable Approach to Hydrophobic Patterning

    Year: 2022

    Journal: Adv. Mater. Technol., Volume 7, JUL

    Authors: Beard, Jeffrey W.; Murty, Shannon; Caulkins, Christina; Strenk, Amanda R.; Luta, Ethan P.; Hunt, Samuel L.; Yates, Matthew Z.; Miller, Benjamin L.

    Organizations: NSF Graduate Research Fellowship; National Institutes of Health, via the Center for Innovation in Point of Care Technologies for HIV/AIDS at Northwestern [60058448]; University of Rochester

    Keywords: mu PADs; hydrophobic patterning; paper-based microfluidics; assay manufacturing

    Paper-based analytical devices, or mu PADs, have proven to be valuable bio-analytical tools for a broad range of applications. New methods for mu PAD fabrication are needed, however, to facilitate their mass production at a competitive cost. To address this need, the use of a boronic acid-containing siloxane polymer (BorSilOx) has been reported for patterning hydrophobic barriers for mu PADs. This material functions by covalently binding to hydroxyl groups in the paper substrate. It is compatible with inkjet printing or roll-to-roll (stamping) processes, as demonstrated here using three different deposition methods. BorSilOx is able to render a broad range of cellulosic materials (from paper towels to wood) hydrophobic, with contact angle measurements demonstrating superhydrophobicity in many cases.The utility of the polymer in mu PADs via assays for pH and glucose is further demonstrated.
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