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실리콘 이온이 첨가된 biphasic calcium phosphate의 합성 및 특성평가
송창원,김태완,김동현,박홍채,윤석영,Song, Chang-Weon,Kim, Tae-Wan,Kim, Dong-Hyun,Park, Hong-Chae,Yoon, Seog-Young 한국결정성장학회 2010 韓國結晶成長學會誌 Vol.20 No.5
Si-BCP(si-substituted biphasic calcium phosphate)를 제조하기 위하여 $Ca(NO_3)_2{\cdot}4H_2O$, $(NH_4)_2HPO_4$, $Si(OC_2H_5)_4$을 출발 물질로 공침법(co-precipitation process)을 이용하여 합성하였다. 합성된 분말의 HAp/${\beta}$-TCP 결정상 비율 및 Si-P 치환 거동은 X-선 회절 상 분석을 이용하여 측정하였고, silicon ion 첨가 시 나타나는 BCP의 화학적 결합거동을 측정하기 위하여 FT-IR를 사용하여 분석하였다. 또한 Si-BCP 분말의 in-vitro 생분해거동 및 생체활성도를 측정하기 위하여 제조된 분말을 SBF(simulated body fluid) solution에 침적시킨 뒤 분말의 형상과 구성 성분은 SEM과 EDS를 통하여 확인하였다. Si-substituted biphasic calcium phosphates (Si-BCP) were prepared by co-precipitation method. X-ray diffraction and fourier transform infrared spectroscopy were used to characterize the structure of Si-BCP powders. The Si-BCP powders with various Ca/(P+Si) molar ratio were carried out on structural change of hydroxyapatite (HAp) and ${\beta}$-tricalcium phosphate ($\ss$-TCP). The in-vitro bioactivity of the Si-BCP powders was determined by immersing the powders in SBF solution, after that observing the chemical composition and morphology change by X-ray diffraction, scanning electron microscope and energy dispersive spectroscopy.
실리카를 함유하지 않는 생체활성 칼슘인산염 글라스-세라믹스의 합성 및 특성
송창원,이주혁,양태영,윤석영,박홍채 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.3
Glass-ceramic materials, which consist of glass matrix phase containing crystalline β-Ca_3(PO_4)_2 and β-Ca_2P_2O_7, have been prepared by heating at 750-900℃ of calcium phosphate invert glasses in the silica-free CaO-P_2O_5-TiO_2-Na_2O system. With increasing heating temperature from 750 to 900℃, the crystallite size of precipitated β-Ca_3(PO_4)_2 in glass with 55CaO·35P_2O_5·3TiO_2·7Na_2O (mol%) composition increased from 48 to 91 nm. With the extension of the immersion time in dilute acetic acid solution (pH = 5) to ≥200 min, the degree of dissolution of Ca^(2+) and P^(5+) ions in the glass-ceramics was linearly increased and the solution was constantly maintained at pH = ~7. Biomimetic nanostructured (62-88 nm in average dia.), sphere-shaped hydroxyapatite was homogeneously formed on the surface of the glass-ceramics when socked for 7-14 days in a Hanks' solution, indicating bioactivity of the prepared glass-ceramics.