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공기/유체 계면의 바이오 템플릿을 이용한 실버 나노시트 제작에 관한 연구
강기호(Giho Kang),성백훈(Baekhoon Seong),이형동(Hyungdong Lee),변도영(Doyoung Byun) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
2D nanomaterials were widely studied due to their excellent physical and chemical properties. However, growth and fabrication strategies to large and high quality 2D nanomaterials were still challenging. In this study, we showed the noble synthesis and fabrication method for large-scale and high-quality 2D silver nanosheet using interface assembly with hydrogel and peptides bio-templates. We studied from the physical phenomena of hydrogel assembly process at the air/solvent interface to applied method of silver 2D crystal growth with multilayering hydrogel and silver assembly process. Furthermore, we used peptide assembly to assist 2D growth of metal ions at interface. We expect our methods could applied to various 2D nanomaterial-based applications.
황상연(Sangyeon Hwang),성백훈(Baekhoon Seong),변도영(Doyoung Byun) 한국가시화정보학회 2014 한국가시화정보학회지 Vol.12 No.2
Conventional electrospray and air spray methods have the vulnerabilities of limited flow rate (throughput) and droplet size, respectively. Since high throughput with uniform size of droplet is required for various applications, an improved technique should be adopted. Here, we report a combined system of an air pressure and an electric field and evaluate the atomization performance of it. The air flow allowed applying high flow rate range and the electric field reinforced the atomization process to generate fine droplets. A correlation between two forces was investigated by comparing the droplet produced by each method. The atomized droplets were measured and visualized by image processing and a particle image velocimetry (PIV). The quantitative results were achieved from the parametric space and the effect of both forces was analyzed. The motion of charged droplets followed the outer electric field rather than the complex vortex in the shear layer so that the droplets accelerated directly toward the grounded collector.
은 나노와이어 특성에 따른 커피 링 현상에 대한 실험적 연구
강기호(Giho Kang),Xiaofeng Wang,성백훈(Baekhoon Seong),이형동(Hyungdong Lee),변도영(Doyoung Byun) 한국가시화정보학회 2017 한국가시화정보학회지 Vol.15 No.2
A coffee-ring effect is from capillary flow by different evaporation rate across the droplet. The capillary flow tends particles to accumulate at the edges of the droplet and makes the ring-shaped stain pattern. These coffee-ring formation and suppression of coffee-ring have been a critical role in printing and coating technologies. In this study, we present the experimental study on coffee-ring effect of silver nanowire inside the evaporating sessile droplet. Size and concentration effect of nanowires at coffee-ring effect has been investigated. From the coffee-ring, we observed the regimes of connected rings and disconnected ones and measure the resistivity of single ring pattern with different nanowire length.