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나노-마이크로 정밀 분사 시스템을 이용한 하이브리드 인공지지체의 제작 및 평가
하성우,김종영 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.8
최근에, 3 차원 인공지지체와 나노섬유는 골 조직 재생을 위해 개발되고 있다. 본 연구에서는, 나노-마이크로 정밀 분사 시스템을 이용하여 하이브리드 인공지지체를 제작하였다. 하이브리드 인공지지체는 마이크로 인공지지체와 나노섬유가 결합하여 제작되었으며, 마이크로 인공지지체와 나노섬유를 얻기 위해 자유 형상 제작 기술과 전기방사 기법이 사용되었다. 마이크로 인공지지체는 정밀한 공극을 고려하여 CAD/CAM 데이터 따라 자유 형상 제작 기술에 의해 제작되었으며, 제작 공정은 100 °C 의 온도, 평균 650 kPa 의 압력, 그리고 250 mm/sec 의 Z 축 이송속도가 적용되었다. 그리고 전기방사법을 통하여 나노섬유를 제작함에 있어서 본 시스템에 적용한 공정 조건은, 5 kV 의 전압, 0.1 ml/min 의 유량, 그리고 1 mm 의 노즐 팁과 콜렉터와의 거리로 설정하였다. 제작된 하이브리드 인공지지체는 MG-63 세포를 이용하여 세포 증식 실험을 진행하였다. Recently, three-dimensional scaffolds and nanofibers are being developed for bone tissue regeneration. In this study, we fabricated a hybrid scaffold using a nano-micro precision deposition system. The fabrication process involved the application of the solid freeform fabrication (SFF) technology and electrospinning. The hybrid scaffolds were combined using micro scaffolds and nanofibers. The nanofibers were deposited on each layer of the micro scaffolding using the electrospinning process. The micro scaffolds were fabricated using the SFF technology at a temperature of 100 °C, pressure of 650 kPa, and scan velocity of 250 mm/s. Nanofiber fabrication was conducted by means of electrospinning using the flow rate, solution concentration, distance from the tip to the collector (TCD), and voltage. The nanofibers were fabricated using a flow rate of 0.1 ml/min, voltage of 5 kV, TCD of 1 mm, and 10 wt% of solution concentration. MG-63 cells were seeded into the hybrid scaffold for the purpose of its evaluation.
하성우(Sung-Woo Ha),김대현(Daehyeon Kim),박경호(Kyeong-Ho Park),정신규(Sin-Kyu Jung),전상주(Sang-Joo Jeon) 한국지반신소재학회 2012 한국지반신소재학회 학술발표회 Vol.2012 No.11
In this study, large direct shear tests on two types of coarse grained soils were performed to understand the effects of particle size on the shear behavior of coarse grained soils with/without geogrid reinforcements. In the case of coarse grained soil without geogrid, the maximum shear stress increased with an increase in normal stress for medium and large particle size.
나노-마이크로 정밀 분사 시스템을 이용한 3차원 하이브리드 인공지지체 제작에 관한 연구
하성우(Seong-Woo Ha),김종영(Jong Young Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In the last 10 years, nanofiber structures fabricated by electrospinning technology have received a lot of attentions as a scaffold for tissue engineering. Electrospinning is a technique for the nanofiber production with diameters of nanomicro scale. In this study, three-dimensional hybrid scaffold was fabricated by nano-micro precision deposition system. Hybrid scaffold was combined in micro scaffold using solid freeform fabrication technology and nanofiber using electrospinning. In the process, micro scaffold was fabricated by 200 mm/sec of scan velocity, 110˚C of temperature and 650 kPa of pressure using solid freeform fabrication technology. For the electrospinning process, nanofibers were obtained from the flow rate of 0.1 ml/min, the voltage of 5 kV, and the needle tip and grounded collector of 1 cm. Polycaprolactone (PCL) is mixed with 10 wt% in chloroform solvent. Hybrid scaffold was observed by scanning electron microscopy (SEM, Tescan VEGA II LMU, Czech) for the observation of successful fabrication result. In near future, we will proceed with cell experiments and compressive test machine for the hybrid scaffold.