Tulaja Shrestha

University of Delaware

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Laure V. Kayser

University of Delaware

Vidhika S. Damani

University of Delaware

Yuhang Wu

University of Delaware

Chun‐Yuan Lo

University of Delaware

Dan My Nguyen

University of Delaware

Kayla Otero

University of Delaware

Xinran Xie

Sixth Affiliated Hospital of Sun Yat-sen University

Khushboo Suman

University of Delaware

Abigail Nolin

University of Delaware

David C. Martin

University of Delaware

Cooperative Institutions

University of Delaware

Newark Hospital

University of California, San Diego

Northwestern University

DuPont (United States)

University of California System

Argonne National Laboratory

Materials Science & Engineering

Centre National de la Recherche Scientifique

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Thermo-reversible gelation of self-assembled conducting polymer colloids

Vidhika S. Damani Xinran Xie Rachel E. Daso Khushboo Suman Masoud Ghasemi

Electrically conductive hydrogels based on conducting polymers have found increased use in bioelectronics due to their low moduli that mimic biological tissues, their ability to transport both ionic and electronic charges, and their ease of processing in various form factors via printing or injection. Current approaches towards conductive hydrogels, however, rely on covalent and therefore irreversible crosslinking mechanisms. Here, we report a thermo-responsive conducting polymer (TR-CP) that undergoes a fully reversible non-covalent crosslinking at 35 °C within less than a minute to form conductive hydrogels. The TR-CP is based on a block polyelectrolyte complex, that self-assembles into well-defined colloidal particles in water which undergo an isovolumetric sol-gel transition just below physiological temperature. The hydrogels have tunable mechanical properties in the 20 to 200 Pa range, are stable at various pH and salt conditions, self-healing, injectable, and biocompatible in vitro and in vivo. We demonstrate that the TR-CPs can be used to fabricate sensitive, conformal and reusable electrodes for surface electromyography. This unique material provides exciting opportunities for stimuli-responsive and adaptive bioelectronics.

10.26434/chemrxiv-2024-g900w

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Self-Assembled Thin Films as Alternative Surface Textures in Assistive Aids with Users Who are Blind

Journal of Materials Chemistry B (2024)

Zachary R. Swain Maryanne Derkaloustian Kayla A. Hepler Abigail Nolin Vidhika S. Damani

Current tactile graphics primarily render tactile information for blind users through physical features, such as raised bumps or lines. However, the variety of distinctive physical features that can be created is effectively saturated, and alternatives to these physical features are not currently available for static tactile aids. Here, we explored the use of chemical modification through self-assembled thin films to generate distinctive textures in tactile aids. We used two silane precursors,

10.1039/d4tb01646g

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Imidazolium-Based Sulfonating Agent to Control the Degree of Sulfonation of Aromatic Polymers and Enable Plastics-to-Electronics Upgrading

JACS Au (2024)

Chun‐Yuan Lo Kelsey P. Koutsoukos Dan My Nguyen Yuhang Wu David Alejandro Angel Trujillo

The accumulation of plastic waste in the environment is a growing environmental, economic, and societal challenge. Plastic upgrading, the conversion of low-value polymers to high-value materials, could address this challenge. Among upgrading strategies, the sulfonation of aromatic polymers is a powerful approach to access high-value materials for a range of applications, such as ion-exchange resins and membranes, electronic materials, and pharmaceuticals. While many sulfonation methods have been reported, achieving high degrees of sulfonation while minimizing side reactions that lead to defects in the polymer chains remains challenging. Additionally, sulfonating agents are most often used in large excess, which prevents precise control over the degree of sulfonation of aromatic polymers and their functionality. Herein, we address these challenges using 1,3-disulfonic acid imidazolium chloride ([Dsim]Cl), a sulfonic acid-based ionic liquid, to sulfonate aromatic polymers and upgrade plastic waste to electronic materials. We show that stoichiometric [Dsim]Cl can effectively sulfonate model polystyrene up to 92% in high yields, with minimal defects and high regioselectivity for the

Polystyrene sulfonate

Sulfonic acid

10.1021/jacsau.4c00355

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