...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Langmuir: The ACS Journal of Surfaces and Colloids >Spherulitic Crystallization in Langmuir-Blodgett Films of the Ditetradecyldimethylammonium-Au(dmit)(2) Salt
【24h】

Spherulitic Crystallization in Langmuir-Blodgett Films of the Ditetradecyldimethylammonium-Au(dmit)(2) Salt

机译：DitetradeCyldimethylium-Au（DMIT）（2）盐的兰姆脲 - Blodgett薄膜中的嗜球素结晶

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

Spherulitic crystallization in Langmuir-Blodgett (LB) films of the ditetradecyldimethylammonium-Au-(dmit)(2) [2C(14)N(+)Me(2)-Au(dmit)(2)] salt has been characterized by polarized light microscopy, Fourier-transform infrared (FT-IR) spectroscopy, and X-ray diffraction (XRD) analyses. Analyses by differential scanning calorimetry (DSC) for the bulk crystals indicate that annealing in the temperature range of 58-100 degrees C may be appropriate to improve the order in the LB film. The polarized light microscopy measurement further revealed that a spherulite structure was formed after the film was annealed at 80 degrees C for 60 min. FT-IR spectroscopy measurements demonstrated that the order of the principal hydrocarbon chains was improved and that the rotation of CH3 groups was hindered by the annealing. Out-of-plane XRD analyses revealed that the d-spacing of the 2C(14)N(+)Me(2)-Au(dmit)(2) LB film changed from 3.1 to 2.5 nm upon annealing. We hypothesize that a layered structure with interdigitated hydrocarbon chains, which is equivalent to or close to that of the corresponding bulk crystal, has been realized in the LB film by annealing. We consider that two different kinds of one-dimensional (1D) interactions along the a-axis are the driving forces to realize the spherulite structure in the LB system; one is an extended 1D contact due to the pronounced interdigitation of the alkyl chains of the ammonium ion, which plays a role similar to that of the folding of chains in the lamellar structures of polymers, and the other is a 1D extended sulfur sulfur contact between Au(dmit)(2) dimer pairs. So far, spherulite formation in LB films has been reported almost exclusively for polymerized materials. Here, we demonstrate that a spherulite texture can also be formed in LB films based on nonpolymerized materials via the interdigitation of hydrocarbon chains, leading to a new well-ordered state.
机译：二立丁二甲基二甲基铵-α-（DMIT）（2）（2）（2）（2C（14）N（+）Me（2）-Au（DMIT）（2）]盐的偏振，Zherum uir-Blodgett（1b）膜中结晶光学显微镜，傅立叶变换红外（FT-IR）光谱和X射线衍射（XRD）分析。通过差示扫描量热法（DSC）对散装晶体的分析表明，在58-100℃的温度范围内的退火可能适合于改善LB膜中的顺序。偏振光显微镜测量进一步揭示了在80℃下以80℃退火60分钟后形成的球晶结构。 FT-IR光谱学测量证明了主要烃链的顺序得到改善，通过退火阻碍了CH3基团的旋转。外平面外XRD分析显示，2C（14）N（+）ME（2）-U（DMIT）（DMIT）（2）LB膜在退火时从3.1到2.5nm变为3.1至2.5nm。通过退火，我们假设具有相同或接近相应的散装晶体的碳氢化合物链的分层结构已经在LB膜中实现了通过退火在LB膜中实现。我们认为，沿着A轴的两种不同类型的一维（1D）相互作用是实现LB系统中的球晶结构的驱动力;由于铵离子的烷基链的烷基链的切口，一个是延伸的1D接触，这起到了与聚合物的层状结构中链中的链中的折叠相似的作用，另一个是延伸的硫硫接触AU（DMIT）（2）二聚体对。到目前为止，LB薄膜中的球晶形成几乎专门用于聚合材料。在这里，我们证明了基于烃链的间断的非聚合材料在LB膜中形成了球晶素织物，导致新的有序状态。

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