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Surface properties and cell response of fluoridated hydroxyapatite/TiO2 coated on Ti substrate
이현욱,Y.S. Jeong,S.Y. Park,정세영,H.G. Kim,조채용 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Dense and well-crystallized TiO2 and fluoridated hydroxyapatite (FHAp) films with TiO2 as a buffer layer were deposited on Ti substrates using a sol–gel spin-coating technique. X-ray diffraction showed a positive correlation between the level of F- incorporation into the HAp structure and the crystallinity of the HAp phase and the concentration of the FHAp phase. The decrease in water contact angle was attributed mainly to the increase in total surface energy of the FHAp/Ti and FHAp/TiO2/Ti as well as the increased polar component in FHAp. The FTIR spectra of the FHAp coated samples showed a weak absorption band at PO3- 4 (1040 and 1092 cm-1) and P–O (875 cm-1), and several strong absorption bands between 3450 and 3550 cm-1 due to F–OH and OH-. The critical load values measured by the scanning scratch tester showed that the adhesion strength of the FHAp/TiO2 coated Ti substrate was 1.2–1.7 times higher than that of the HAp and FHAp coated Ti substrate. The level of cell attachment on FHAp and FHAp/TiO2 coated Ti substrates were 1.4 and 1.7 times higher than that on the HAp coated Ti substrate, respectively. Dense and well-crystallized TiO2 and fluoridated hydroxyapatite (FHAp) films with TiO2 as a buffer layer were deposited on Ti substrates using a sol–gel spin-coating technique. X-ray diffraction showed a positive correlation between the level of F- incorporation into the HAp structure and the crystallinity of the HAp phase and the concentration of the FHAp phase. The decrease in water contact angle was attributed mainly to the increase in total surface energy of the FHAp/Ti and FHAp/TiO2/Ti as well as the increased polar component in FHAp. The FTIR spectra of the FHAp coated samples showed a weak absorption band at PO3- 4 (1040 and 1092 cm-1) and P–O (875 cm-1), and several strong absorption bands between 3450 and 3550 cm-1 due to F–OH and OH-. The critical load values measured by the scanning scratch tester showed that the adhesion strength of the FHAp/TiO2 coated Ti substrate was 1.2–1.7 times higher than that of the HAp and FHAp coated Ti substrate. The level of cell attachment on FHAp and FHAp/TiO2 coated Ti substrates were 1.4 and 1.7 times higher than that on the HAp coated Ti substrate, respectively.
형상기억합금을 이용한 초소형 기계의 척킹/클램핑 시스템 개발
김은영(E. Y Kim),박정우(J. W Park),정세영(S. Y Jeong),이득우(D. W Lee),박종권(J. K Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
SMA(Shape Memory Alloy) has unique properties compared to other metals and metallic alloys; shape memory effect, superelasticity, damping property etc. The research for the application of those unique properties of SMA to the industry have generated extraordinary interesting for the past a few years. In this study, a chucking/clamping system of micro-factory system using Ni-Ti SMA ring with one-way shape memory effect was developed. Ar of the SMA is 15℃. In order to evaluate the tool chucking/clamping system, three kinds of SMA rings with different diameter (Φ7, Φ8.5, Φ10㎜) were tested about recovery property and position accuracy. Stress and displacement on the collet caused by SMA's shape memory effect were analysed using FEM(Finite Element Method). Finally, we found the SMA has great potential for the mechanical chucking/clamping applications in micro-factory tool holder system.
윤두협,유용구,곽민한,류한철,이승권,정세영,Yoon, D.H.,Yoo, Y.G.,Kwak, M.H.,Ryu, H.C.,Lee, S.K.,Jeong, S.Y. 한국전자통신연구원 2006 전자통신동향분석 Vol.21 No.6
종래의 서브-밀리미터파 또는 원적외선 대역까지 이르는 THz파는 지금까지 발생 및 검출이 어려웠기 때문에 과학연구 및 산업 분야로의 응용연구가 제대로 진행되지 못했다. 그러나 최근 레이저 기술의 발전에 힘입어 발생법과 분광법의 개발연구가 진척되고, THz파가 새로운 센싱통로(sensing through)로서 각광을 받게 되었다. 따라서 본 고에서는 THz 기술개발 및 이를 이용한 응용연구 관련 주요 기술들을 소개하고자 한다.
고온용 Nitinol 형상기억합금의 열적/동역학적 특성평가
차수영,박상언,조채룡,박종권,정세영 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
In the resent years, as the research and the development of micro and precision machinery become active, the interest of micro actuators using SMA(Shape Memory Alloy) has been increased. But, no detailed researches between the thermo-dynamic property in Nitinol alloy have been done yet. In this study, the thermal property of high temperature Nitinol shape memory alloy were evaluated using differential scanning calorimeter(DSC). The structure property was investigated using X-ray diffraction(XRD). A dynamic mechanical analyzer(DMA) with three point bending mode was used to study storage and loss modulus of shape memory alloy according to the thirteen frequencies in the temperature range between 30 and 200℃. The effects of the temperature heating/cooling rate, the frequency on the damping capacity have been systematically investigated. Such a frequency and temperature changes also influenced significantly to the damping behavior of the shape memory alloy. It was also found that Nitinol exhibited high damping capacity during phase transformation.