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首页> 外文会议>International Conference on "Times of Polymers and Composites" >Bulk and confined non-polar and polar chain-like organics by external probing ESR technique
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Bulk and confined non-polar and polar chain-like organics by external probing ESR technique

机译：通过外部探测ESR技术散装和密闭的非极性和极性链状的有机物

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摘要

A comparative investigation of the bulk vs. confinement state in two representative organic molecular chain-like media in a series of inorganic SiO_2 matrices via external probing method with molecular probe TEMPO using electron spin resonance (ESR) technique is reported. N-hexadecane (n-HXD) and n-propanol (n-PrOH) are used as prototypical non-polar medium-sized or polar and protic short-sized chain-like substances, respectively. Both, differences and similarities in the TEMPO dynamics in both the organic compounds are mentioned. In particular, in the case of n-HXD, the TEMPO mobility is dramatically slowed down with respect to the bulk state with the relatively small sensitivity to the mean pore size of the silicagel (SG) matrix due to the preferential localization at the surfaces of the pores. On the other hand, in the case of n-PrOH, the reduction of the TEMPO dynamics is significantly milder but with the essentially larger sensitivity to the pore size of the SG matrix. The dynamic heterogeneity of molecular probe TEMPO in both confined media of the different origin is observed. Finally, implications concerning the characterization potential using the spin probe ESR technique for the confined organic systems are considered.
机译：报道了通过使用电子自旋共振（ESR）技术的一系列外部探测方法在一系列无机SiO_2矩阵中的两种代表性有机分子链状介质中散装与分子样培养基的对比研究。 N-十六烷（N-HXD）和N-丙醇（N-PROH）分别用作原型非极性介质或极性和质子短尺寸的链状物质。提及两种有机化合物中的节奏动力学中的差异和相似性。特别地，在N-HXD的情况下，由于硅蛋白（SG）矩阵的平均孔径（SG）矩阵的平均孔径而显着减慢了散装状态的速度迁移性。毛孔。另一方面，在N-PROH的情况下，节奏动力学的减少显着更温和，但对SG矩阵的孔径的敏感性基本较大。观察到不同来源的两个受限介质中分子探针速度的动态异质性。最后，考虑了使用用于限制有机系统的旋转探针ESR技术的表征电位的含义。

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