Growth of spherulitic crystal patterns in a Belousov–Zhabotinski type reaction system

Yadav, Narendra; Srivastava, Priyanka

doi:10.1039/c0nj00798f

Cited by 3 publications

(6 citation statements)

References 34 publications

(80 reference statements)

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“…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. 3 was confirmed by GC-MS analysis as shown in Fig.…”

Section: Solid-state Nucleationsupporting

confidence: 80%

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

et al. 2015

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The morphological orders of spherulitic crystal patterns in a Belousov-Zhabotinsky-type oscillatory reaction system were studied. The experiments showed that the morphology of crystal patterns were highly dependent on the reaction temperature. The reaction was initially carried out at 30 • C, leading to the growth of multi-centred spherulitic patterns. The single-centred spherulitic patterns with fairly large crystal fibrils were obtained at 35 • C. A number of undersized crystal assemblies with fractal geometry were also investigated at 25 • C. The gross morphology of the crystal patterns was examined using optical microscopy and a scanning electron microscope which revealed the fibrous organisations. A particle-mediated self-assembly scheme was proposed for the growth of the spherulitic patterns. The insight into the nucleation mechanism, growth behaviour, and morphological orders of the growing patterns is discussed in detail. The crystal phases, ordering of textures, and composition of the crystals were characterised by thermal and X-ray diffraction techniques.

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Section: Solid-state Nucleationsupporting

confidence: 80%

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

et al. 2015

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“…Depending upon characteristics and size of these particles, the diffusion coefficients allow aggregation with much higher or lower mobility towards the nucleation sites. Under diffusion conditions, this aggregation mechanism is similar to cycles of oscillations or periodic routes [34]. It results in a fine-tuned ordered structure of dendritic patterns, as observed during the experiment.…”

Section: Growth Phenomenon Of Nanostructured Dla Crystal Pattern Formmentioning

confidence: 73%

“…The formation of ordered dendritic crystal structure can be favoured by two factors relating to conventional BZ reaction systems [34]. Firstly, the dynamic instability generates a concentration gradient between nucleation centres and fine solid particles.…”

Section: Growth Phenomenon Of Nanostructured Dla Crystal Pattern Formmentioning

confidence: 99%

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

Srivastava

2014

Adv. Nat. Sci: Nanosci. Nanotechnol.

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Nanostructured diffusion-limited-aggregation (DLA) crystal pattern formation in microemulsion consisting of water, styrene, cetyltrimethylammonium chloride (CTACl), potassium persulphate and an oscillating Belousov-Zhabotinsky (BZ) reactant is reported. A variety of spatiotemporal patterns like concentric wave, spatial (stripe) and chaotic patterns appear. A colloidal phase composed of numerous nano-sized particles has been observed. The solid phase nucleation has been found to occur in the colloidal phase and has been found to grow in a symmetric crystal pattern with the progress of the reaction finally exhibiting DLA structures. We show that the formation of a nanostructured DLA crystal pattern is governed by spatial structures emerging in the BZ microemulsion system. Without any spatial structure in the microemulsion system only hydrogel of high viscosity is formed. A nano-sized branched crystal pattern was formed with a particle diameter in the range of 60-100 nm, as evident by transmission electron microscope, powder x-ray diffraction and particle size analyser studies.

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“…as discussed. 25,26 Based on the reaction behaviors, the oscillatory cycles of the present reaction has been are summarized as; the AA is initially oxidized, the concentration of product A and B increases significantly. It confirmed by red-colored (reduced state) solution.…”

Section: +mentioning

confidence: 99%

“…Instead, the qualitative aspects of patterns formation and chemistry of the present studies have been summarized in our earlier report. 24,25 Based on this, three stable products have been proposed through Scheme-I, in the Figure 2, which served as precursor for spherulitic crystal growths.…”

Section: +mentioning

confidence: 99%

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

Yadav¹,

Majhi²,

Srivastava³

2012

Bulletin of the Korean Chemical Society

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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.

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Growth of spherulitic crystal patterns in a Belousov–Zhabotinski type reaction system

Cited by 3 publications

References 34 publications

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

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

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

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

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