Template Synthesis of Mesoporous Carbons with Regular Pore Structure

规则孔结构介孔碳的模板合成

基本信息

批准号：
11650791
负责人：
KYOTANI Takashi
金额：
$ 2.24万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

The importance of mesopores in porous carbons has been pointed out not only for giant molecule adsorption, but also for new application such as electric double layer capacitors. Thus, the design and control of carbon mesoporosity is very desirable both for the improvement of adsorption performance and for the development of new application fields. A precision technique for controlling mesopores was already established in the production of mesoporous silica such as MCM-41 and FMS-16, which contain hexagonally arranged one-dimensional pores of tunable diameter from 1.5 to 10 nm. These mesoporous silica materials were prepared through a liquid crystal templating mechanism where organic surfactant molecules are self-assembled into hexagonal arrangement of rod-like micelles and these organic rods function as a template during the formation of silica network structure. Final heat-treatment of the silica complexes at a high temperature converts the rod-like micelles into the one-dimensional p … More ores.In the present study, such structurally regulated micelles of organic surfactants have been utilized as a template in synthesizing mesoporous carbons with regular pore structure. Cetyltrimethylammonium bromide (CTAB) and sucrose were used as organic surfactant and carbon precursor, respectively. When they were dissolved in water under proper conditions, rod-like micelles were formed from the surfactant into hexagonal arrangement and sucrose molecules were moved outside the micelles as a result. Then, some amount of sulfuric acid was added, thereby polymerizing sucrose due to its dehydration reaction. The polymerization was further promoted by heat treatment at 200 C.Through these processes, we could obtain micelle/sucrose polymer composite, in which the hexagonal structure of the micelles still remained. Such ordered structure in this composite was experimentally confirmed with an X-ray diffractometer. It is expected that, if the resultant composite is further heat-treated at a high temperature to remove the micelles, mesoporous carbon with regular pore structure would be formed by a templating mechanism similar to that described above. Less

多孔碳中介孔的重要性已被指出，不仅对于大分子吸附，而且对于双电层电容器等新应用来说，碳介孔的设计和控制对于提高吸附性能和性能都是非常必要的。为了开发新的应用领域，已经在介孔二氧化硅（例如含有六方排列的MCM-41和FMS-16）的生产中建立了精确的介孔控制技术。这些介孔二氧化硅材料是通过液晶模板机制制备的一维孔径可调的，其中有机表面活性剂分子自组装成棒状胶束的六边形排列，并且这些有机棒在过程中充当模板。二氧化硅络合物在高温下的最终热处理将棒状胶束转化为一维 p … 更多在本研究中，这种结构调控的有机表面活性剂胶束已被用作合成具有规则孔结构的介孔碳的模板，十六烷基三甲基溴化铵（CTAB）和蔗糖分别用作有机表面活性剂和碳前体。在适当的条件下溶于水，表面活性剂形成六角形排列的棒状胶束，蔗糖分子移出胶束外然后加入一定量的硫酸，通过200℃的热处理进一步促进蔗糖的聚合，得到胶束/蔗糖聚合物复合材料。通过X射线衍射仪实验证实，如果对所得复合材料进行进一步热处理，则胶束的六方结构仍然保留。在高温下去除胶束，通过类似于上述的模板机制形成具有规则孔结构的介孔碳。