한국재료학회지 · 한국재료학회

Research Paper

Hydrogen Uptake and Diffusivity Measurement Technology in Sulfur-Crosslinked Nitrile Butadiene Rubber Polymer Composites
황가교 NBR 고분자 복합체의 수소 장입량 및 확산도 측정 기술

Ji Hun Lee, Myung Chan Choi
이지훈, 최명찬

A technology was developed to measure the hydrogen uptake and diffusivity of polymer materials used in high-pressure hydrogen tanks and pipelines at … + READ MORE

A technology was developed to measure the hydrogen uptake and diffusivity of polymer materials used in high-pressure hydrogen tanks and pipelines at hydrogen refueling stations. This technology involves charging hydrogen into polymer under a maximum pressure of 90 MPa, followed by depressurization. The polymer material is then placed in a cylinder partially submerged in water, and hydrogen is released from the material. The increase in volume of the released hydrogen causes a decrease in the water level in the cylinder. To track this in real-time, an image analysis algorithm based on the brightness of a crescent-shaped water level image is used to accurately measure the water level and change in hydrogen amount at the same time. This data is then used in a self-developed diffusivity analysis program to evaluate hydrogen uptake and diffusivity. Using this technology, the hydrogen uptake and diffusivity of sulfur-crosslinked nitrile butadiene rubber (NBR) composites containing carbon black and silica fillers were measured from 2 to 90 MPa. Additionally, the relationship between the physical stability of the NBR composites and their hydrogen uptake and diffusivity was investigated. To validate the effectiveness of the technology, an uncertainty analysis of the measurements was conducted, with all results showing an uncertainty within 8 %. - COLLAPSE

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27 April 2025
Research Paper

Effect of Rapid Thermal Annealing on the Electrical and Optical Properties of TiO₂/Ag/TiO₂ Thin Films
급속열처리에 따른 TiO₂/Ag/TiO₂ 박막의 전기적, 광학적 특성

Daeil Kim, Jiho Kim, Byeong-Geun Park, Heon-Jo Lee, Young-Min Kong
김대일, 김지호, 박병근, 이헌조, 공영민

TiO₂/Ag/TiO₂ (TAT) tri-layer films were deposited using radio frequency (RF) magnetron sputtering and direct current (DC) magnetron sputtering on … + READ MORE

TiO₂/Ag/TiO₂ (TAT) tri-layer films were deposited using radio frequency (RF) magnetron sputtering and direct current (DC) magnetron sputtering on a glass substrate, and then rapid thermal annealed at 150 and 300 °C for 10 minutes. The influence of annealing temperature on the optical and electrical properties of the films was investigated. As annealing temperature was rapidly increased from room temperature to 300 °C, the grain size of the TiO₂ (004), (204) and Ag (200) increased from 36.8, 14.3, 22.1 nm to 43.2, 16.6, 23.4 nm, respectively and the electrical resistivity decreased from 4.64 × 10^-5 Ω cm to 2.79 × 10^-5 Ω cm. Also, the average visible transmittance increased from 82.7 % to 84.9 %. In addition, the electromagnetic interference shielding effectiveness of TAT films was also increased to 31.7 db after annealing at 300 °C. These results demonstrate that post-deposition rapid thermal annealing is an effective method for enhancing the electrical and optical properties of TAT films. - COLLAPSE

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27 April 2025