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  • 02월 28일 19시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제111회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Interlayer structure study on amino acid intercalated layered double hydroxide depending on the structure of amino acid

등록일
2013년 2월 28일 10시 34분 41초
접수번호
1475
발표코드
MAT.P-1075 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 17일 (수요일) 16:00~19:00
발표형식
포스터
발표분야
재료화학
저자 및
공동저자
박가영, 양재훈, 최진호*
이화여자대학교 화학.나노과학과, Korea
We have successfully prepared two different kinds of Amino Acid such as Phenylalanine (Phe) and Glutamic acid (Glu) into layered double hydroxide (LDH) via ion exchange reaction. At first, we synthesized Mg2Al-(NO3)-LDH at pH10 via coprecipitation. Since amino acids have different charge depending on the pH of the reaction solution, we carried out the ion-exchange reaction in the pH range of deprotonating the carboxylic acid group of amino acid, 7 ~ 10 for Phe and 7 ~ 11 for Glu. According to X-ray diffraction analysis, Phe is not intercalated into LDH at pH7, but Phe is successfully intercalated into LDH at pH 10, which is higher than pKa2 of Phe (9.32) and the basal spacing was expanded to 1.8 nm compared to that of the pristine LDH (0.88 nm), indicating that Phe lattice with bilayer structure. On the other hand, Glu is intercalated into LDH at the range of pH 7 ~ 11, and the basal spacing is ~0.95 nm regardless of pH, since dicarboxylic acid group in Glu were completely deprotonated above pH 6 to be negatively charged. The difference of basal spacing between Phe-LDH and Glu-LDH nanohybrid was caused by the different interlayer structure of amino acid through the different total net charge,indicating that Phe is incorporated into LDH with paraffin-type interdigited bi-layer structure, but Glu is intercalated into LDH with parallel mono layer structure to the ab plane of LDH.

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