School of Engineering Department of Chemical and Biological Engineering 71 Rational Design of Wearable Device for Stress Assessment via Perspiration Analysis Supervisor: NYEIN Hnin Yin Yin / CBE Co-supervisor: HSING I-ming / CBE Student: ZISENGWE Vimbai Norraine / CENG Course: UROP 1000, Summer This report investigates the optimization of Janus membranes for use in wearable sweat-collecting devices. Janus membranes have two sides with different hydrophilic and hydrophobic properties, creating a one-way valve that allows unidirectional sweat flow. The principles of hydrophilicity, hydrophobicity, and capillary action are discussed. An experiment fabricated VLD membranes using nylon and cotton with varying hole sizes. The materials were treated to create a hydrophobic gradient, enabling sweat permeation while maintaining user comfort. The goal is to advance noninvasive, decentralized healthcare technologies that leverage sweat biomarkers. The findings can contribute to the development of efficient one-way valves for wearable medical devices that monitor physiological conditions through continuous sweat analysis. Advanced Catalysts for Water Splitting and Hydrogen Production Supervisor: SHAO Minhua / CBE Student: CHEUNG Tsz Ying / CHEM ZHU Yihan / CHEM Course: UROP 1100, Summer UROP 1000, Summer In order to reduce the use of fossil fuels, hydrogen fuel cells serve as a promising alternative. Catalysts for hydrogen oxidation and oxygen reduction are required in the hydrogen fuel cell. In this project, Ru-MnO/C and Pt-MnO/C catalysts will be prepared and compared to determine which one will have better effectiveness in the hydrogen oxidation reaction. X-ray diffraction technology is carried out to define the crystalline structure of the product. Then, data on the current density of these catalysts against potential will be collected. As a result, Pt-MnO/C has a better performance in hydrogen oxidation reactions. Advanced Catalysts for Water Splitting and Hydrogen Production Supervisor: SHAO Minhua / CBE Student: NG Hin Ngai / CEEV Course: UROP 1000, Summer In this report, the synthesis processes of two metal-organic frameworks (MOFs) (i.e. nickel ferrocene (NiFc) and nickel ferrocene vanadium (Ni0.7FcV0.3)) are presented as oxygen evolution reaction (OER) electrocatalysts via hydrothermal reaction using nickel chloride hydrate, 1,1’-Ferrocenedicarbonxylic acid, and vanadium chloride hydrate. The morphologies of these two catalysts exhibit nanosheet structure, providing excellent electrolyte penetration and gas transportation. The obtained Ni0.7FcV0.3-MOF/NF performs excellent OER activity in the linear sweep voltammetry (LSV) measurements, with an overpotential of 266 mV and 410 mV at 100 mA cm-2 and 1000 mA cm-2 respectively. Moreover, we also find that Ni 0.7 FcV0.3-MOF gives lower overpotentials than NiFc-MOF/NF by introducing V elements.
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