다양한 메조 다공성 실리케이트의 합성과 특성 연구
Fabrication and characterization of various mesoporous silicates
- 발행기관 江陵大學校 大學院
- 지도교수 鄭鎭承
- 발행년도 2008
- 학위수여년월 2008. 2
- 학위명 석사
- 학과 및 전공 化學科
- 원문페이지 iv, 45 p.
- 본문언어 한국어
초록/요약
This study is about fabrication and characterization of a variety nanostructures such as nanowire, mesoporous silicate, and core/shell. In the first study, we synthesized anodic aluminum oxide (AAO) which in a mesoporous template for transforming monosized 10nm magnetite nanoparticles into nanowires. TEM and FESEM showed that the nanoparticles were changed to polycrystalline nanowire phase in AAO. Coercivity was 350 Oe at cryogenic temperature, and it increased to 8000 Oe after annealing. In the second study, mesoporous calcium silicate materials were proposed for biomedical application as drug delivery systems and bone tissue regeneration materials. The mesoporous calcium silicate proved that it had better vitro bioactivity than traditional bioactive materials. Calcium silicate is not only an important substance in the ceramic and cement industries but also a novel biomaterial due to its good bioactivity and degradability/resolvability. We synthesized well-ordered mesoporous calcium silicate by simple sol-gel method, which was investigated by TG, FESEM, XRD, and EDS. Catalytic activity was surveyed as conversion of methane and carbon dioxide after nickel-inserted mesoporous calcium silicate. In the third study, magnetic ferrite nanoparticles were the subject of intense research due to their potential application such as high density magnetic storage and drug delivery. Gold particles also are attractive materials that have been widely exploited in biology because of affinity for binding of biomoloecular ligands containing thiol or disulfide group. Also mesoporous silica have been one of the main topics of its porous materials because of its uniformity. We reported synthesis method and properties of three layer core/shell nanoparticles including properties of gold, silica and cobalt ferrite nanoparticles. The cobalt ferrite nanoparticles were produced by a wet chemical technique that involves organic solution-phase decomposition of the cobalt and iron precursor at high temperature. Synthesised cobalt ferrite nanoparticles were used as seeding materials for the reduction of gold precursors to produce gold-coating cobalt ferrite nanoparticles. And silica was coated at the gold-coating cobalt ferrite nanoparticles surface by water-in-oil process. The physical and chemical properties of these silica and gold-coated cobalt ferrite nanoparticles have been investigated by UV-visible spectrophotometer, XRD, TEM and SQUID.
more목차
Ⅰ. 서 론 = 1
1. 나노다공성 물질(Nanoporous materials) = 3
2. 나노 자성체 (Ferrite) = 7
3. 메탄과 이산화탄소의 개질변화 = 10
4. Core/Shell 나노구조 물질 = 12
Ⅱ. 실 험 = 14
1. 기구 및 시약 = 14
1) 알루미나 막 (AAO)제조 및 산화철 (Fe3O4)나노입자 합성 = 14
2) 메조포어 칼슘실리케이트 제조 및 촉매 합성 = 15
3) Core/Shell (CoFe2O4@Au@SiO2) 나노구조 합성 = 15
2. 측정 장치 = 17
3. 실험 방법 = 18
1) 산화철 (Fe3O4)나노입자의 형상 변화 = 18
2) 메조포어 칼슘실리케이트 촉매 합성 = 20
3) Core/Shell (CoFe2O4@Au@SiO2) 나노구조 합성 = 22
Ⅲ. 결과 및 고찰 = 24
1. 알루미나 막 (AAO)및 산화철 (Fe3O4)나노입자 구조 분석 = 24
2. 메조포어 칼슘실리케이트 형상분석 및 촉매활성 = 29
3. Core/Shell (CoFe2O4@Au@SiO2) 나노구조 분석 = 34
Ⅳ. 결 론 = 38
참고문헌 = 40
Abstract = 44
