DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Jong-Duk | - |
dc.contributor.advisor | 김종득 | - |
dc.contributor.author | Song, Myung-Geun | - |
dc.contributor.author | 송명근 | - |
dc.date.accessioned | 2011-12-13T01:35:54Z | - |
dc.date.available | 2011-12-13T01:35:54Z | - |
dc.date.issued | 2003 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=181128&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/28900 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2003.2, [ xiii, 140 p. ] | - |
dc.description.abstract | The pore size of mesoporous silica has been controlled by mixed surfactant systems of cationic CTAB and nonionic $C_{16}EO_{10}$, which have the same length of hydrophobic chain. The pore size can be increased maintaining the characteristics of an ordered array of pores by CTAB with small ratios of $C_{16}EO_{10}$ and moderate amount of acid, since the EO chains of $C_{16}EO_{10}$ can be embedded into silica matrix to create micropores. At high ratios of $C_{16}EO_{10}$, a different structure based on $C_{16}EO_{10}$ templates exhibiting high d spacing was observed by X-ray diffraction pattern and the large pore could be attributed to the dense layer of EO chain in addition to the hydrophobic core. At high concentrations of HCl in reactant gel mixtures, separated mesophases were observed, mainly attributed to the preferential strong hydrogen bonding between $C_{16}EO_{10}$ and hydrolyzed product of TEOS compared with the charge coupling interaction between CTAB and silicate species. Mesoporous silica with 2D-hexagonal mesophase via $(S^+I^-)$ and $(S^+X^-I^+)$ synthetic routes was successfully synthesized within ca. 2hrs of reaction time under microwave-hydrothermal conditions at 373K. The cubic mesophase, MCM-48, was also synthesized successfully by using microwave method within ca. 2hrs at 373K without the addition of ethanol, but prolonged microwave radiation had a negative effect on the structural ordering, resulting in disordered network structure consisting of short wormlike channels. Several nonionic surfactants such as $C_{16}EO_{10}$, $C_{18}EO_{10}$ and $C_{18}H_{35}EO_20}$ were used as structure-directing agents via $(S0H^+)(X^-I^+)$ synthetic route under microwave radiation. Therefore, the ordered mesophases were synthesized successfully within very short crystallization time compared with the conventional hydrothermal heating. In addition to the uniform and fast dielectric heating of water, the microwave activates water molecules resulting in th... | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | mesoporous titania thin film | - |
dc.subject | microwave | - |
dc.subject | mixed cationic-nonionic surfactant | - |
dc.subject | mesoporous silica | - |
dc.subject | photovoltaic cell | - |
dc.subject | 광전지 | - |
dc.subject | 메조포러스 티타니아 박막 | - |
dc.subject | 마이크로웨이브 | - |
dc.subject | 혼합 양이온-비이온 계면활성제 | - |
dc.subject | 메조포러스 실리카 | - |
dc.title | Synthesis of mesoporous materials by supramolecular templating approach and its application | - |
dc.title.alternative | 초분자 겹집체를 이용한 메조포러스 물질의 합성과 그 응용 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 181128/325007 | - |
dc.description.department | 한국과학기술원 : 생명화학공학과, | - |
dc.identifier.uid | 000985184 | - |
dc.contributor.localauthor | Kim, Jong-Duk | - |
dc.contributor.localauthor | 김종득 | - |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.