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Lee, Byeonghun,Lee, Saebom,Kim, Hyeonsoo,Jeong, Kijun,Park, Jinbyung,Lee, Eunyeol,Lee, Jinwon Kluwer Academic Publishers 2015 Biotechnology letters Vol.37 No.5
<P>To produce 10-ketostearic acid from oleic acid.</P>
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.
Saebom Lee,Seung Tae Choi,Youn Young Earmme,Dae Youl Chung 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
A problem of a circular elastic inhomogeneity interacting with a crack under uniform loadings (mechanical tension and heat flux at infinity) is solved. The singular integral equations for edge and temperature dislocation distribution functions are constructed and solved numerically. to obtain the stress intensity factors. The effects of the material property ratio on the stress intensity factor (SlF) are investigated. The computed SIFs are used to predict the kink angle of the crack when the crack grows.
Lee, Saebom,Park, Seung-Tae,Earmme, Youn-Young,Chung, Dae-Youl The Korean Society of Mechanical Engineers 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.8
A problem of a circular elastic inhomogeneity interacting with a crack under uniform loadings (mechanical tension and heat flux at infinity) is solved. The singular. integral equations for edge and temperature dislocation distribution functions are constructed and solved numeric-ally, to obtain the stress intensity factors. The effects of the material property ratio on the stress intensity factor (SIF) are investigated. The computed SIFs are used to predict the kink angle of the crack when the crack grows.