https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/251 Fri, 03 Jul 2026 14:18:18 GMT 2026-07-03T14:18:18Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212739 Title: Low-frequency ionic-electronic coupling for energy-efficient noise-resilient wireless bioelectronics Authors: Kim, Ji Hong; Kim, Haerim; Rhee, Jaewon; Kim, Joo Sung; Choi, Hanbin; Choi, Won Hyuk; Park, Yoseph; Kim, Jong Hwi; Kim, So Young; Ahn, Seungyoung; Kim, Do Hwan Abstract: Wireless bioelectronics demand transduction strategies that are simultaneously sensitive, noise-resilient, and biologically safe. Conventional wireless sensors typically rely on dielectric capacitors with inherently low capacitance, necessitating operation at MHz frequencies. Such high-frequency coupling often introduces electromagnetic interference, tissue heating, and degraded signal fidelity in biological environments. Here we present a wireless low-frequency electrochemical sensing (WiLECS) platform that couples ionic dynamics with low-frequency LC resonant circuits. The device combines a biocompatible ion gel, composed of a choline-malate ionic liquid embedded in a chitosan matrix with functionalized Au nanoparticles, with a miniaturized LC antenna. Unlike conventional capacitive sensors, WiLECS employs piezo-driven ion redistribution to modulate the dielectric environment of the circuit, enabling sustainable wireless transduction below 1 MHz with high sensitivity and reliability. This approach directly bridges ionic dynamics and electronic resonance, allowing mechanical stimuli to be transduced into biologically safe low-frequency electronic signals. As proof of concept, we demonstrate real-time wireless blood-pressure monitoring in artificial arteries with atherosclerotic plaque, showing resolution of subtle pressure variations under clinically relevant conditions. Tue, 01 Dec 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212739 2026-12-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/217616 Title: A dual-function chromium-trapping current collector enabling poisoning-free and durable high-temperature fuel cells Authors: Park, Sun-Young; Jo, Kanghee; Hwang, Seongyeon; Kang, HeeChan; Park, Mi Young; Kim, Hyo-Jin; Park, Jinhong; Lee, Insung; Ko, Min Jae; Kim, Jun Hyuk; Kim, Kyeounghak; Kim, Jae Jin; Yoon, Kyung Joong Abstract: High-temperature degradation remains a critical barrier to solid oxide fuel cell (SOFC) commercialization, with Cr vapor–induced electrode poisoning representing one of the most persistent challenges. Here, we present a Co–Ni spinel oxide as a dual-function current collector that actively scavenges Cr vapor while maintaining efficient electrical coupling between the cell and interconnects. Upon Cr exposure, the spinel incorporates Cr via preferential substitution at octahedral Co sites, assisted by Ni acting as a redox-flexible mediator, thereby enabling effective Cr interception without compromising electrical conductivity. Foam- and porous-layer-type Cr-trapping current collectors were developed for practical implementation in realistic SOFC systems. Under severe Cr exposure, reference cells exhibited a 17.6% performance loss over 200 h, whereas cells incorporating the Cr-trapping collector showed complete suppression of degradation, demonstrating robust and sustained electrode protection. This strategy provides a simple, scalable, and effective route to enhancing SOFC durability and extending system lifetime. Thu, 01 Oct 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/217616 2026-10-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212783 Title: Highly sensitive electrospun ammonia sensor using polydiacetylene incorporating hemi-protonated cytosine Authors: Park, Sumin; Jo, Hyeonjeong; Khazi, Mohammed Iqbal; Hwang, Hyemin; Lee, Dong Geol; Kim, Jong-Man Abstract: Polydiacetylenes (PDAs) have attracted significant attention as promising materials for sensor development due to their unique colorimetric and fluorescent responses to external stimuli. In this study, we propose a PDA-based sensor structure capable of selectively detecting ammonia, developed from a diacetylene monomer functionalized with a cytosine moiety (CyDA). By inducing hemi-protonation, we established a CyDA-H platform that enables colorimetric ammonia sensing. Furthermore, instead of conventional film-casting or drop-casting methods, we employed an electrospinning technique to overcome the limitation of low sensitivity. CyPDA-H was immobilized within a three-dimensional porous polyethylene oxide (PEO) nanofibrous matrix via electrospinning, enhancing reactivity with ammonia molecules. The resulting sensor exhibited a low detection limit of 17 ppm and demonstrated excellent selectivity for ammonia over various amines and basic compounds. Additionally, real-time monitoring of raw chicken spoilage at 4 °C and 25 ℃ revealed a gradual color change from blue to red due to the accumulation of ammonia released during decomposition, which was clearly visible to the naked eye. This study successfully demonstrates the fabrication of a highly sensitive electrospun-type CyPDA-H sensor and highlights its strong potential for commercial application as a simple and easy-to-use food freshness indicator. Tue, 01 Sep 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/212783 2026-09-01T00:00:00Z https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/213291 Title: Integrated screening and intensified process evaluation of DETA/AMP/PZ blended solvents for energy-efficient CO2 capture in a rotating packed bed Authors: Min, Gwan Hong; Jang, Jaesu; Lee, Chanwool; Kim, Jin-Kuk; Hwang, Yuntae; Nam, Sung Chan; Lee, Sunghoon Abstract: The development of energy-efficient CO2 absorbents suitable for intensified operation remains a critical challenge in advancing post-combustion carbon capture technologies. In this study, nine ternary amine blends (DAP-1 to DAP-9) composed of diethylenetriamine (DETA), 2-amino-2-methyl-1-propanol (AMP), and piperazine (PZ) were systematically screened to identify a high-performance solvent for rotating packed bed (RPB) operation. Vapor–liquid equilibrium (VLE), wetted-wall column (WWC), and differential reaction calorimeter (DRC) experiments were conducted, and regeneration energies were estimated using a thermodynamic model. All blends exhibited higher CO2 solubility and mass-transfer performance than 30 wt% MEA, with CO2 loading mainly governed by DETA content and absorption kinetics promoted by PZ. Among the screened formulations, DAP-3 provided the most favorable balance of cyclic capacity, reaction heat, and regeneration demand, achieving the highest cyclic capacity (0.24 mol-CO2/mol-amine) and the lowest theoretical energy requirement, primarily due to its significantly reduced sensible-heat contribution. DAP-3 was subsequently evaluated in an RPB-based CO2 capture process and consistently required less regeneration energy than MEA across variations in reboiler temperature, gas and liquid flow rates, and rotational speed, exhibiting 13–20% reductions at optimal conditions. Regeneration energy decreased under lower reboiler temperatures, intensified gas throughput, and higher rotational speeds, while a characteristic V-shaped dependence on liquid flow rate revealed an optimal circulation level that minimized heat duty. These findings demonstrate that DAP-3 effectively balances absorption kinetics and energy consumption, establishing it as a promising solvent for intensified CO2 capture in RPB-based post-combustion applications. Sat, 01 Aug 2026 00:00:00 GMT https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/213291 2026-08-01T00:00:00Z