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김수룡,권우택,김영희,김종일,이윤주,이현재,오세천,Kim, Soo Ryong,Kwon, Woo Teck,Kim, Younghee,Kim, Jong Il,Lee, Yoon Joo,Lee, Hyun Jae,Oh, Sea Cheon 한국재료학회 2012 한국재료학회지 Vol.22 No.12
The effects of clay, aluminum hydroxide, and carbon powder on the sintering of a Si/SiC mixture from photovoltaic silicon-wafer production were investigated. Sintering temperature was fixed at $1,350^{\circ}C$ and the sintered bodies were characterized by SEM and XRD to analyze the microstructure and to measure the apparent porosity, absorptivity, and apparent density. The XRD peak intensity of SiC in the sintered body was increased by adding 5% carbon to the Si/SiC mixture. From this result, it is confirmed that Si in the Si/SiC mixture had reacted with the added carbon. Addition of aluminum hydroxide decreased the cristobalite phase and increased the stable mullite phase. The measurement of the physical properties indicates that adding carbon to the Si/SiC mixture enables us to obtain a dense sintered body that has high apparent density and low absorptivity. The sintered body produced from the Si/SiC mixture with aluminum hydroxide and carbon powder as sintering additives can be applied to diesel particulate filters or to heat storage materials, etc., since it possesses high thermal conductivity, and anticorrosion and antioxidation properties.
삼차원 매쉬 구조 기반 유체 패터닝 및 하이브리드 바이오 프린팅 기술 개발
김수룡,전누리 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
Bio-printing has been widely used in fabricating tissue engineering scaffolds, drug/toxicity screening and developing in-vitro tissue/tumor models. Bio-printing enables fabrication of complex 3D structures using different polymers and hydrogels. However, relatively low resolution and long fabrication time due to extrusion process results in limited practices for cell-based applications. Here, we present a 3D Hybrid Micromesh Assisted bio-Printing (Hy-MAP) method that combine 3D printed micromesh scaffold structures and sequential hydrogel patterning. This approach enables construction of meso-scale complex 3D hydrogel structures by extending micropost-based patterning demonstrated in 2D microfluidic channels to 3D channel networks. We established the design rules for the Hy-MAP through both analytical and experiment investigation of capillary bursting pressure (CBP) dependence on the size and geometry of the mesh as well as other physical parameters. Liquid and hydrogels can be sequentially patterned at desired locations by introducing liquids using pipette or by immersion into cell-laden ECM solutions. Vascularized tumor spheroids were formed in Hy-MAP by culturing endothelial cell, stromal cell mixtures and tumor spheroid inside separate but adjacent compartments. The novel approach described in this work will provide an alternative method for fabricating meso-scale tissue implantable engineering constructs and organ-on-a-chip applications.
김수룡,이병민,박용갑 한국세라믹학회 1991 한국세라믹학회지 Vol.28 No.11
Calcium hydroxyapatite have been synthesized by a direct precipitation reaction between 0.05 M calcium hydroxide suspension and 0.3 M orthophosphoric acid solution. 0.01 M calcium hydroxide solution was added during the reaction in order to increase the total Ca/P mol ration and reaction pH of the solution. The stoichiometric hydroxyapatite was synthesized over 1.75 as total Ca/P mol ratio, but the calcium-deficient hydroxyapatite was prepared under 1.725 as total Ca/P mol ratio. The nonstoichiometry of the precipitates were interpreted in terms of the pH change during the reaction.
Si을 함유하는 Hydroxyapatite의 합성 및 특성 분석
김수룡,김영희,정상진,류도형 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.12
생체친화성이 증진된 생체재료를 얻기 위하여 실리콘 원료로 tetraethyl orthosilicate를 사용하여 실리콘이 치환된 hydroxyapatite를 합성하였다. XRD 분석결과 규산이나 다른 인산칼슘염을 포함하지 않는 순수한 hydroxyapatite상 만이 존재하는 것을 확인할 수 있었다. 성분분석 결과 3.32wt% 까지의 실리콘을 함유하였다. $^{29}$ Si MAS NMR 데이터 분석결과 실리콘은 수산화아파타이트의 결정 내에서 규산염 사면체구조를 가지는 것으로 확인할 수 있었다. FT-IR 분석결과 Si 치환 수산화아파타이트에서 수산기가 감소되는 것은 silicate group의 음전하를 보상하기위한 것으로 사료되었다. A silicon-substituted hydroxyapatite was prepared using tetraethylorthosilicate as a silicon source to obtain a biomaterial having an improved biocompatibility. From the XRD analysis, it was confirmed that a single-phase hydroxyapatite containing silicon was formed without revealing the presence of extra phases related to silicon oxide or other calcium phosphate species. Silicon content was up to 3.32% by weight. Through $\^$29/Si MAS NMR investigation we could confirm the presence of tetrahedral silicate in the framework of hydroxyapatite structure. Substitution of silicon into the hydroxyapatite framework (Ca$\_$10/(PO$_4$)$\_$6-x/(SiO$_4$)$\_$x/(OH)$\_$2-x/ reduced the amount of hydroxyl group to compensate for the extra negative charge of the silicate group, which is confirmed by FT-IR.
산호 유래 실리콘 함유 다공성 수산화아파타이트의 합성 및 특성 분석
김수룡,이윤주,송희,이종헌,이강식,김해중,김영희,Kim, Soo-Ryong,Lee, Yoon-Joo,Song, Hee,Lee, Jong-Heon,Lee, Kang-Sik,Kim, Hae-Joong,Kim, Young-Hee 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.8
생체친화성 인공골 개발을 위하여 해면골과 매우 유사한 기공구조를 갖는 천연 산호(CaCO$_3$, aragonite phase)를 수열처리하여 수산화아파타이트 다공체를 제조하였다. 생체 친화성을 증진시키기 위하여 산호를 수열 처리하는 과정에서 실리콘을 치환시키는 실험을 하였다. 수열합성과 solvothermal 방법을 반복적으로 사용하여 실리콘이 치환된 수산화아파타이트를 합성하였으며 이들의 각 온도에 따른 상변화 및 실리콘 농도를 XRD, ICP, EDS 등을 통하여 분석하였다. 분석결과로부터 실리콘이 수산화아파타이트 골격 내에 균일하게 분산되어 있음을 확인하였다. A porous hydroxyapatite has been prepared using natural coral which resembles human cancellous bone in microstructure. To obtain a biomaterial having a good biocompatibility, substitution of silicon into the hydroxyapatite framework has been attempted. Si substituted hydroxyapatite has been prepared by hydrothermal treatment and solvothermal treatment of the natural coral repeatedly. Si concentration and phase of the Si substituted hydroxyapatite derived from coral have been characterized using a XRD, ICP, and EDS etc. EDS investigation confirmed the presence of silicon in the framework of hydroxyapatite structure.