From homogeneous to heterogeneous nucleation of chain molecules under nanoscopic cylindrical confinement.
From homogeneous to heterogeneous nucleation of chain molecules under nanoscopic cylindrical confinement.
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DOI：
10.1103/physrevlett.98.136103
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发表时间：
2007-03
影响因子：
8.6
通讯作者：
Euntaek Woo;J. Huh;Y. Jeong;Kyusoon Shin
中科院分区：
文献类型：
--
作者：
Euntaek Woo;J. Huh;Y. Jeong;Kyusoon Shin
用量热法研究了单分散线性聚乙烯在纳米多孔氧化铝中的结晶过程。我们观察到结晶行为的剧烈变化，特别是成核，孔径减小。在直径为62和110 nm的较大孔隙中，结晶发生在较低的温度范围内，而在直径为15-48 nm的较小孔隙中，结晶发生在较高的温度范围内。基于经典成核理论和Avrami理论，讨论了纳米孔中的成核和结晶动力学。
The crystallization of monodisperse linear polyethylene confined in nanoporous alumina is investigated with the calorimetric measurements. We observe a drastic change in crystallization behavior, specifically nucleation, with a decrease in the pore diameter. Crystallization in relatively larger pores with the diameters of 62 and 110 nm occurs at lower temperatures within a very narrow range, whereas crystallization in smaller pores with diameters of 15-48 nm occurs at a higher and broad range of temperatures. Nucleation and crystallization kinetics in nanopores is discussed based on classical nucleation theory as well as the Avrami theory.