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알지네이트를 이용한 셀룰로오스 하이드로겔의 투과 특성 제어
정은수(Eunsue Jeong),신성철(Sungchul Shin),박민성(Minsung Park),현진호(Jinho Hyun) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.2
Natural cellulose hydrogel membrane cannot be directly used for cell encapsulation because it has many large pores on the surface that immune biomolecules are able to penetrate into easily. For the reason, alginate was used for the control of pore size of the cellulose hydrogel membrane. The surface morphology of cellulose/alginate nanocomposite confirmed the successful control of the porosity of the membrane. The permeability of the cellulose/alginate nanocomposite was decreased but mechanical properties were increased compared with the bacterial cellulose membrane. The cellulose/alginate nanocomposite could be used for the functional membrane as a promising biomedical material in the future.
Co-base 분말을 적용한 SCM440과 GC250의 레이저 클래딩 가공성 평가
최병주(Byungjoo Choi),이문구(Moon G. Lee),홍민성(Minsung Hong),안병민(Byungmin Ahn),정도현(Do-Hyun Jung),이광재(Kwangjae Lee),이충근(Chunggeun Lee),전용호(Yongho Jeon) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.3
The laser cladding process on structural steel (SCM440) and gray cast iron (GC250) substrates with Co-based powder (Stellite 12) was studied. A diode laser (2 kW) was used as a heat source, and the powder was supplied by a disc rotary powder feeder. The relationship between the laser cladding process and the cross-sectional analysis of coating was examined based on coating shape and microstructure. Additionally, the microhardness was measured to confirm the mechanical property improvements. As a result, proper laser cladding conditions were selected through this study and verified by cross-sectional analysis. In addition, the evaluation process for laser cladding feasibility was conducted on the selected materials.