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

中孔在多孔碳中的重要性不仅指出了巨型分子的吸附，而且还可以增加新应用，例如电动双层电容器。这是碳中孔的设计和控制，既可以提高吸附性能和开发新的应用领域。在介孔二氧化硅（例如MCM-41和FMS-16）的生产中已经建立了一种用于控制中孔的精确技术，该技术含有1.5至10 nm的六维孔的可调直径。这些介孔二氧化硅材料是通过液晶模板机制制备的，在这种机制中，将有机表面活性剂分子自组装成棒状胶束的六边形布置，这些有机棒在二氧化硅网络结构形成过程中起作用。在高温下二氧化硅配合物的最终热处理将类似杆状的胶束转化为一维p…更多的矿石。在本研究中，这种有机表面活性剂的结构调节的胶束已被用作模板，用于合成与常规孔结构的介孔碳。肉基三甲基铵（CTAB）和蔗糖分别用作有机表面活性剂和碳前体。当它们在适当条件下溶解在水中时，将表面活性剂形成棒状胶束到六边形排列中，结果将蔗糖分子移动到胶束外。然后，加入了一定量的硫酸，从而由于其脱水反应而导致的聚合蔗糖。通过在200个过程中进行热处理进一步促进了聚合。通过这些过程，我们可以获得胶束/蔗糖聚合物复合材料，其中胶束的六边形结构仍然保留。通过X射线衍射仪实验确认了该复合材料中的这种有序结构。预计，如果在高温下进一步对所得复合物进行进一步的热处理以去除胶束，则具有常规孔结构的介孔碳将由类似于上述的模板机制形成。较少的