@article{jamalzadegan_kim_mohammad_koduri_hetzler_lee_dickey_wei_2024, title={Liquid Metal-Based Biosensors: Fundamentals and Applications}, volume={1}, ISSN={["1616-3028"]}, url={https://doi.org/10.1002/adfm.202308173}, DOI={10.1002/adfm.202308173}, abstractNote={Abstract}, journal={ADVANCED FUNCTIONAL MATERIALS}, author={Jamalzadegan, Sina and Kim, Sooyoung and Mohammad, Noor and Koduri, Harshita and Hetzler, Zach and Lee, Giwon and Dickey, Michael D. and Wei, Qingshan}, year={2024}, month={Jan} }
 @article{choi_lee_kim_kim_choi_so_koo_2022, title={A fully textile-based skin pH sensor}, volume={3}, ISSN={["1530-8057"]}, DOI={10.1177/15280837211073361}, abstractNote={ This paper presents a textile-based pH sensor with high flexibility fabricated by printing a polymer composite as a working electrode and Ag/AgCl/solid electrolyte as a reference electrode on a textile substrate. The textile working electrode is composed of polyaniline, carbon nanotubes, and agarose printed on the textile. A thermoplastic polyurethane overlayer hot-pressed on the textile substrates provides a smooth hydrophobic surface, enabling a more stable formation of the composite films with a reliable output signal. The textile reference electrode is fabricated by printing Ag/AgCl paste and solid electrolyte. The fully textile-based pH sensor, by integrating the textile working and reference electrodes, exhibits a good sensitivity of 45.9 mV/pH with high linearity. The textile pH sensor maintains excellent performance and repeatability with 93% retention even in a bent state and after 1000 bending cycles. Finally, it is demonstrated that the textile pH sensor can detect the pH change on a piece of porcine skin. }, journal={JOURNAL OF INDUSTRIAL TEXTILES}, author={Choi, Min-Young and Lee, Minji and Kim, Ji-Hye and Kim, Sooyoung and Choi, Jonghoon and So, Ju-Hee and Koo, Hyung-Jun}, year={2022}, month={Mar} }
 @article{kim_park_kim_so_koo_2022, title={Effect of Surrounding Solvents on Interfacial Behavior of Gallium-Based Liquid Metal Droplets}, volume={15}, ISSN={["1996-1944"]}, DOI={10.3390/ma15030706}, abstractNote={Gallium-based liquid metal (GaLM) alloys have been extensively used in applications ranging from electronics to drug delivery systems. To broaden the understanding and applications of GaLMs, this paper discusses the interfacial behavior of eutectic gallium-indium liquid metal (EGaIn) droplets in various solvents. No significant difference in contact angles of EGaIn is observed regardless of the solvent types. However, the presence or absence of a conical tip on EGaIn droplets after dispensing could indirectly support that the interfacial energy of EGaIn is relatively low in non-polar solvents. Furthermore, in the impact experiments, the EGaIn droplet bounces off in the polar solvents of water and dimethyl sulfoxide (DMSO), whereas it spreads and adheres to the substrate in the non-polar solvents of hexane and benzene. Based on the dimensionless We number, it can be stated that the different impact behavior depending on the solvent types is closely related to the interfacial energy of EGaIn in each solvent. Finally, the contact angles and shapes of EGaIn droplets in aqueous buffer solutions with different pH values (4, 7, and 10) are compared. In the pH 10 buffer solution, the EGaIn droplet forms a spherical shape without the conical tip, representing the high surface energy. This is associated with the dissolution of the “interfacial energy-reducing” surface layer on EGaIn, which is supported by the enhanced concentration of gallium ion released from EGaIn in the buffer solution.}, number={3}, journal={MATERIALS}, author={Kim, Ji-Hye and Park, Ye-Jin and Kim, Sooyoung and So, Ju-Hee and Koo, Hyung-Jun}, year={2022}, month={Feb} }