초록문의 abstract@kcsnet.or.kr

결제문의 member@kcsnet.or.kr

현재 가능한 작업은 아래와 같습니다.
  • 02월 22일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Mesoporous Silicas by Self-assembling of Lipid Molecule: Ribbon, Hollow Sphere and Chiral materials

2008년 2월 15일 18시 25분 18초
27P23포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
목 <발표Ⅱ>
저자 및
Haiying Jin, Huibin Qiu, Yasuhiro Sakamoto, Peng Shu, Osamu Terasaki, Shunai Che
Department of Chemistry, School of Chemistry and Chemical Technology,Shanghai Jiao Tong University,
Using lipids (N-acyl amino acid) and 3-aminopropyltriethoxysilane (APES) as structure and co-structure directing agents, mesoporous silicas with four different morphologies, that is helical ribbon (HR), hollow sphere, circular disc and helical hexagonal rod were synthesized only by changing synthesis temperature from 0 to 10, 15 and to 20 °C. Their structures were studied by electron microscopy. It has been found that (i) they have structures double-layer disordered mesopores in HR and radially oriented mesopores in the hollow sphere, and highly ordered straight and chiral 2d-hexagonal mesopores in the disk-like and helical rod, respectively; (ii) these four types mesoporous silicas were transformed from the flat bilayered lipid ribbon with the chain-interdigitated layer phase through solid-solid transformation for HR formation and dissolving procedure transformation for hollow sphere, circular disc and twisted morphologies, respectively; (iii) the mesoporous silica helical ribbon was exclusively right-handed and the 2d-hexagonal chiral mesoporous silica was left-handed excess when L form N-acyl amino acid has been used as lipid template; (iv) the HR has been formed only by the chiral lipid molecules and the 2d-hexagonal chiral mesoporous silicas have been formed chiral, achiral and racemic lipids. Our findings give important information for the understanding of the formation of chiral materials at the molecular level and will facilitate a more efficient and systematic approach to generating rationalized chiral libraries.