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이진기(Jinkee Lee) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this presentation, I want to discuss about the fluid mechanical researches for Interdisciplinary applications. The topic is synthesis of monodispersed microparticles. Not only the complex particles with various shapes such as bullets, cylinders, discs, hearts, hexagons, and Janus particles but microspheres can be synthesized by the surface-tension-induced flow and Laplace pressure induced flows in micromolds. Along with the various shapes of the particles, a novel synthesis method shows the flexibility to synthesize particles using various reaction schemes, such as photopolymerization, sol-gel reactions, and colloidal assembly. This method can produce highly monodispersed particles, without the need to use complicated control. It allows high flexibility in choosing materials and size control.
Highly enhanced sensitivity of humidity-responsive PVP/PAA actuator containing MOF nanoparticles
Saebom Lee(이새봄),Minki Lee(이민기),Jinkee Lee(이진기) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
A humidity-responsive actuator expands or contracts in response to the ambient humidity. Bending performance of the actuator is determined by a variety of factors such as surface structures, materials and etc. In this study, we investigated the bending performances of the bilayer PVP/PAA actuators with different surface structures by changing the alignment of fibers and the thickness of the layer via electrospinning. First, we fabricated the PVP/PAA actuators electrospun at rotational speeds of 180, 1000, 1500 and 2000 rpm. The degree of the fiber alignment was improved as the rotational speed increased and the actuator with higher alignment showed the maximum curvature change when the relative humidity varied from 10% to 80 %. Furthermore, the layer thickness varied by controlling the electrospinning time and the result showed that the thicker actuator had larger curvature change but less sensitivity to humidity. Finally, we fabricated highly sensitive PVP/PAA actuator by adding metal-organic framework (MOF) nanoparticles. As a result, the MOF-actuator showed larger curvature change than the bare PVP/PAA actuator and higher sensitivity to humidity even though they had the same thickness because the MOF nanoparticles adsorbed the water molecules at even low humidity and reduced the adhesion between the layers.