Growth of spherulitic crystal patterns in a Belousov–Zhabotinski type reaction system
作者:Narendra Yadav、P. K. Srivastava
DOI:10.1039/c0nj00798f
日期:——
The growth of spherulitic crystal patterns in a BelousovâZhabotinski (BZ) type reaction system by using acetyl acetone (AA)âsuccinic acid (SA) as dual organic substrates has been reported. The reaction system in the liquid phase has been found to show concentric ring-like wave patterns. A colloidal phase composed of numerous fine particles has also been observed during reaction. The solid phase nucleation has been found to occur in the colloidal phase, which leads to the formation of some stable nucleus centers. The solid phase nucleus has been found to grow in symmetric crystal patterns, with the progress of reaction, exhibiting spherulitic morphology. The possible growth behavior of spherulites has also been discussed. The spherulitic structure composed of fine crystal fibrils diverging from a common center have been observed by a scanning electron microscopy (SEM) technique. The polymorphic crystalline phase, found in spherulites has been supported by thermal characterization (TGA/DTA) and X-ray diffraction (XRD) patterns of crystal materials.
据报道,以乙酰丙酮(AA)-丁二酸(SA)为双有机基质,在贝洛索夫-扎博金斯基(BZ)型反应体系中生长出了球状晶体图案。研究发现,液相中的反应体系呈现出同心环状波纹。在反应过程中还观察到由无数细小颗粒组成的胶体相。在胶体相中发现了固相成核现象,从而形成了一些稳定的核中心。随着反应的进行,固相核以对称的晶体模式生长,呈现球状形态。此外,还讨论了球晶的可能生长行为。通过扫描电子显微镜(SEM)技术,观察到了由从共同中心发散的细小晶体纤维组成的球状结构。晶体材料的热表征(TGA/DTA)和 X 射线衍射(XRD)图也证实了球晶中发现的多晶体相。