Growth Mechanism and Crystal Ordering of Spherulitic Patterns in a Belousov-Zhabotinsky Type Reaction System

Abstract

Three types of spherulitic morphologies have been investigated in dual substrate mode of BelousovZhabotinsky (BZ) type reaction system. Prior to growth of spherulites, three distinct patterning behaviors have been observed sequentially during the reaction process. Initial and the early-phase of reaction showed the emergence of concentric ring-like wave patterns. A colloidal-state of reaction consists of numerous fine solid particles, which forms primarily some nucleation centers of dendritic characters. The nucleation centers were found to grow in sizes and shapes with the progress of reaction. It leads to growth of dendritic-like spherulitic crystal patterns. The resultant spherulites showed transitions in their morphologies, including sea-weeds and rhythmic spherulitic crystal patterns, by the effects substituted organic substrate and in the higher concentration of bromate-initiator respectively. The branching mechanism and crystal ordering of spherulitic textures were studied with help of optical microscope (OPM) and scanning electron microscope (SEM). Characteristics of crystal phases were also evaluated using X-ray diffraction (XRD) and differential thermal analysis (DTA). Results indicated that the compositions of reactants and crystal orderings were interrelated with morphological transitions of spherulites as illustrated and described.

Morphological orders of spherulitic crystal textures in Belousov–Zhabotinsky-type oscillatory reaction system

“…The fine solid particles observed during the colloidal phase may be individual products of A, B, and C or their complexes (Gómez et al, 2005). A similar study was also performed in our Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/26/15 4:41 AM previous work (Yadav et al, 2012). The presence of Ce-ions and Fe-ions in the structural materials was confirmed by EDS analysis, as reported previously (Yadav & Srivastava, 2011), the product in Fig.…”

Nanostructured diffusion-limited-aggregation crystal pattern formation in a reactive microemulsion system

“…The Laplacian growth model is consistent with the DLA model [23]. DLA methods have been used to describe the growth behaviour and fractal complexity during pattern formation in a BZ-type reaction system [24,25]. This method involves a very simple algorithm which can produce highly intricate structures by random aggregation of particles.…”