• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >High-pressure salt templating strategy toward intact isochoric hierarchically porous carbon monoliths from ionic liquids
【24h】

High-pressure salt templating strategy toward intact isochoric hierarchically porous carbon monoliths from ionic liquids

机译：来自离子液体的高压盐模板策略朝向完整的等载性分层多孔碳整料

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Through a facile and novel high-pressure salt templating approach, a crack-free hierarchically porous carbon monolith without visible volume changes was prepared using 1-ethyl-3-methyl-imidazolium dicyanamide (Emim-dca) as a carbon precursor. TG-DSC and FT-IR measurements revealed that Emim-dca pyrolysis, decomposition, crosslinking and carbonization reactions occurred in turn at temperatures of 234-350 degrees C, 350-520 degrees C and 520-1000 degrees C, respectively, which provides a guide for the preparation of an intact porous carbon monolith. The porous carbon monolith prepared at 4 MPa is amorphous and composed of small, uniform carbon particles with interconnected interstitial pores. Its bulk density is 0.072 g cm(-3). Besides the advantages of well monolithic formability and integrity derived from high pressure strategy, interestingly, the obtained porous carbon monolith possesses a higher specific surface area compared to the porous carbon powders fabricated through ambient pressure salt templating. The meso and macro specific surface area of the resultant porous carbon monolith is nearly three times higher (314.0 versus 106.7 m(2) g(-1)) with the content of 4 nm mesopore increasing dramatically compared to that of porous carbon powders prepared under ambient pressure, while the architecture of micropores keeps unchanged. These results might be explained as follows. The high pressure compresses gas molecules from the decomposition reaction into the carbon skeleton to form super-mesopores and macropores and simultaneously disperses salt clusters, generating small (similar to 4 nm) mesopores. As a solution to volume expansion in powders obtained via salt templating, the high pressure results in a porous carbon with an intact monolithic shape without volume expansion or shrinkage. Thus, fiber-reinforced porous carbon composites can be prepared for ultra-high-temperature insulation using the high-pressure salt templating method.
机译：通过容易和新的高压盐模板方法，使用1-乙基-3-甲基 - 咪唑鎓二氰胺（eMIM-DCA）作为碳前体制备不具有可见体积变化的无裂缝分层多孔碳整体。 TG-DSC和FT-IR测量显示，eMIM-DCA热解，分解，交联和碳化反应分别发生在234-350℃，350-520摄氏度和520-1000摄氏度的温度下，提供a制备完整多孔碳整体的指南。在4MPa制备的多孔碳整料是无定形的，并且由小，均匀的碳颗粒组成，均匀的间质孔隙。其堆积密度为0.072g cm（-3）。除了井的单片可成形性和源自高压策略的完整性的优点外，有趣的是，与通过环境压力盐模板制造的多孔碳粉末相比，所获得的多孔碳整向性具有更高的比表面积。所得多孔碳整料的Meso和宏观比表面积接近三倍（314.0与106.7μm（2 )g（2）g（-1）），其含量为4nm的中孔，与在下面制备的多孔碳粉末相比，血液急剧增加环境压力，而微孔的架构保持不变。这些结果可能如下所述。高压将气体分子从分解反应压缩到碳骨架中以形成超级孔和大孔，同时分散盐簇，产生小（类似于4nm）的中孔。作为通过盐模板获得的粉末体积膨胀的溶液，高压导致多孔碳，其具有不容易膨胀或收缩的完整整体形状。因此，可以使用高压盐模板方法制备纤维增强多孔碳复合材料以进行超高温绝缘。

著录项

  • 来源
    《RSC Advances》 |2017年第81期|共8页
  • 作者

    Zhang Zhen; Feng Junzong; Jiang Yonggang; Feng Jian;

  • 作者单位

    Natl Univ Def Technol Sci &

    Technol Adv Ceram Fibers &

    Composites Lab 109 De Ya Rd Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Sci &

    Technol Adv Ceram Fibers &

    Composites Lab 109 De Ya Rd Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Sci &

    Technol Adv Ceram Fibers &

    Composites Lab 109 De Ya Rd Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Sci &

    Technol Adv Ceram Fibers &

    Composites Lab 109 De Ya Rd Changsha 410073 Hunan Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号