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제108회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Intercalation of bio-functional molecules into calcium containing layered metal hydroxides

2011년 8월 1일 16시 43분 24초
Ⅱ-MAT.P-311 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 <발표Ⅱ>
저자 및
김태현, 최애진1, 최진호2, 오제민3, 박충범1
연세대학교 화학과, Korea
1농촌진흥청 약용작물과, Korea
2이화여자대학교 화학.나노과학과, Korea
3연세대학교 화학및의화학과, Korea
We prepared layered metal hydroxides (LMHs), which consisted of mixed metal hydroxide layers and interlayer anions, via coprecipitation method by titrating mixed metal solutions (Ca/Al = or Ca/Fe = 2/1) with sodium hydroxide solution until pH of ~11.5 and ~13.0 for CaAl- and CaFe-LMHs, respectively. From X-ray diffraction (XRD) patterns, both LMHs are determined to have hydrocalumite (JCPDS No.19-0902)-like structures with space group of C2/c and cell parameters of a = 5.76 Å, c = 17.22 Å and a = 5.87 Å, c = 17.23 Å for CaAl- and CaFe-LMHs. X-ray absorption spectroscopy (XAS) were applied to analyze the local symmetry and structure around metal ions; X-ray absorption near edge structure (XANES) spectra exhibited that the calcium in both LMHs has 7 coodination with oxygen, which well corresponds to the hepta-coordination of calcium in hydrocalumite structure. For the intercalation of bio-functional molecules like ascorbic acid, folic acid and taurine into the interlayer space of LMHs, two different intercalative routes, exfoliation-reassembly (ER) and solid-phase (SP) intercalation were utilized. The ER intercalates were obtained by delaminating LMHs into nanosheets in formamide solution and restacking them under the existence of bio-functional molecules, while SP intercalates were obtained by grinding LMHs powders with bio-functional molecule salts in mortar. From the fourrier transform infrared (FT-IR) spectra, both intercalates, ER and SP ones are determined to have electrostatic interaction between bio-functional molecules and positively charged layers. Meanwhile, it was proven from XRD patterns that the ER intercalates have amorphous structures and the SP ones have crystalline layer-by-layer stacking.