成核
材料科学
结晶
纳米颗粒
差示扫描量热法
胶体金
化学工程
形态学(生物学)
纳米晶
粒子(生态学)
纳米技术
结晶学
化学
热力学
有机化学
地质学
工程类
物理
海洋学
生物
遗传学
作者
Miroslav Šlouf,Taťana Vacková,Alexander Zhigunov,Antonín Sikora,Ewa Piórkowska
标识
DOI:10.1080/00222348.2016.1153402
摘要
The influence of gold nanoparticle morphology on nucleation of isotactic polypropylene (PP) crystallization was investigated. Previous experiments indicated certain nucleation activity of gold nanoparticles, varying with their size. In this work, eight types of gold micro/nanoparticles were used: vacuum-sputtered nanostructures (nanoparticles, nanoislands, and nanolayers), chemically prepared isometric gold nanocrystals (5, 20, and 100 nm diameters), and two types of gold microcrystals with well-developed crystal facets [with (100) and (111) facets, respectively]. To minimize the effect of particle agglomeration, we used our recently introduced sandwich method, in which the nucleating agent was deposited between thin PP films and the nucleation was evaluated by polarized light microscopy (PLM), X-ray scattering (WAXS), and differential scanning calorimetry (DSC). The nucleation activity of Au particles in PP was lower than it might be expected from the previous studies and depended on their morphology. The nucleation activity of Au microcrystals with well-developed facets was higher than the activity of non-faceted Au nanocrystals.
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