• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Phase change materials of fatty amine-modified silicate clays of nano layered structures
【24h】

Phase change materials of fatty amine-modified silicate clays of nano layered structures

机译：纳米结构脂肪胺改性硅酸盐粘土的相变材料

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fatty-amine modified silicate clays of layered structure were prepared by conventional intercalation of n-octadecyl amine (n-C18H37NH2, ODA) into sodium montmorillonite clay (Na+-MMT). Organically modified clays are considered as a new type of phase change materials (PCM). At one equivalent ratio of ODA-HCl over Na+-MMT by an ionic exchange reaction, the interlayer galleries of the silicates' layered structure were expanded from 12 ? to 28 ? as measured by X-ray diffraction (XRD) analysis. As a result, the organoclay (ODA/MMT) became hydrophobic and spacing was accessible for incorporating a second organic compound, n-octadecane. Physical absorption of n-octadecane in ODA/MMT allowed interlayer spacing and further expansion from 28 ? to 30 ?. Absorption efficiency, defined as the weight of n-octadecane over ODA/MMT, ranged from 5.3 to 9.1 fold depending on the amount of ODA intercalation. Since n-octadecane is a kind of paraffin wax, a phase change temperature of 25–29 °C was observed. The n-octadecane was characterized by thermal gravimetric analysis (TGA) to study absorption efficiency of ODA/MMT. During the heating process, the ODA/MMT/n-octadecane powder remained in solid state without any liquid leakage at 80 °C (far beyond the phase change temperature). Thus, the organoclay (ODA/MMT) can be used as good thermal storage and phase change material.
机译：通过 n -十八烷基胺（ n -C 18 的常规嵌入）制备层状结构的脂肪胺改性硅酸盐粘土。 small> H 37 NH 2 ，ODA）制成钠蒙脱土（Na + -MMT）。有机改性的粘土被认为是一种新型的相变材料（PCM）。通过离子交换反应，ODA-HCl与Na + -MMT的当量比为1时，硅酸盐层状结构的层间画廊从12？扩大。到28？通过X射线衍射（XRD）分析测量。结果，有机粘土（ODA / MMT）变成疏水性，并且可以通过引入第二种有机化合物 n -十八碳烷获得间距。在ODA / MMT中对 n -十八烷的物理吸收允许层间间距和从28？进一步扩展。至30？。吸收效率（定义为 n -十八烷在ODA / MMT上的重量）在5.3到9.1倍之间，具体取决于ODA嵌入量。由于 n -十八烷是一种石蜡，因此观察到相变温度为25-29°C。通过热重量分析（TGA）对 n -十八烷进行表征，以研究ODA / MMT的吸收效率。在加热过程中，ODA / MMT / n -十八烷粉末在80°C（远超过相变温度）时保持固态，没有任何液体泄漏。因此，有机粘土（ODA / MMT）可以用作良好的储热和相变材料。

著录项

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