Spherulitic crystallization
WebNov 1, 2024 · The method presented here can be a useful technique to construct the spherulitic morphology based on crystallization conversion curves and predict properties dependent on the spherulite size, size ... WebMar 18, 2016 · A method of gradient cooling-down isothermal crystallization was used to prepare layered spherulites. The polyester was dissolved in chloroform to obtain a uniform solution (3 wt% for PLLA and 2 wt% for PHB). A drop of the solution was cast and uniformly spread on a clean glass slide.
Spherulitic crystallization
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Artificial glass sometimes crystallizes and contains spherulites that may be as large as a marble. As the glass has little similarity in chemical composition to volcanic obsidians, these spherulites when analyzed throw little light on the mineral nature of spherulites in rocks. They show, however, that in viscous semi … See more In petrology, spherulites are small, rounded bodies that commonly occur in vitreous igneous rocks. They are often visible in specimens of obsidian, pitchstone, and rhyolite as globules about the size of millet seed or rice grain, … See more Under the microscope the spherulites are of circular outline and are composed of thin divergent fibers that are crystalline as verified with polarized light. Between crossed See more Occasionally spherulites are found that are many centimeters and, even more rarely, up to two or three meters in diameter. Those spherulites, which are more than 20 centimeters in … See more Variolites are a type of radiate fibrous growth, resembling spherulites in many respects, consisting of minute feathery crystals spreading … See more Spherulites are most common in silica-rich glassy rocks. Sometimes they compose the whole mass; more usually they are surrounded by a glassy or felsitic base. When obsidians are devitrified, the spherulites are often traceable, though they may be more or … See more Very large and cavernous spherulites are called lithophysae; they are found in obsidians at Lipari, in Yellowstone Park and other places. The characteristic radiate fibrous structure is … See more WebThe growth of spherulitic crystal patterns in a Belousov–Zhabotinski (BZ) type reaction system by using acetyl acetone (AA)– succinic acid (SA) as dual organic substrates has …
WebSubsequent DSC scans of isothermally crystallized PBS and PBSR exhibited two melting endotherms, respectively, which was due to the melt-recrystallization process occurring … WebJan 1, 2004 · The spherulitic aggregate is too fine grained to be determined directly of what minerals it is composed. Bigger spherulites have a much more complicated inner structure. The alkali feldspar is...
WebThese results provide quantitative support for the mechanism of spherulitic growth proposed by Keith and Padden. AB - I show that diffusion-controlled growth can account … WebJul 5, 2024 · Spherulitic devitrification is a post-eruptive process affecting many rhyolitic lavas of the Taupo region. The spherulites consist of cryptocrystalline intergrowths of α -cristobalite and alkali feldspar (calcic anorthoclase), with minute granules of magnetite, hematite, and secondary (?)goethite.
WebJul 20, 2004 · (III) A discussion is given concerning the shape of the bulk‐crystallization isotherms associated with spherulitic growth, including stage‐1 and stage‐2 crystallization, and the presence of amorphous material in the spherulites. REFERENCES 1. P. H. Geil, J. Appl. Phys. 33, 642 (1962). Google Scholar Scitation 2. J. D.
WebMar 23, 2014 · The crystal growth proceeds as the stacks of lamellar crystals and amorphous layers in between. (c, e, f) When polymers are crystallized from the melt, … spills database searchWebJan 28, 1999 · Chitosan crystallization, performed by simple drying of an oligomer or polymer solution on a glass or mica surface, was studied at room temperature. Polarizing … spills database texasWebFeb 1, 2011 · Spherulitic crystallization of β‐In2Te3 by physical vapour deposition. Different morphologies of indium telluride (In2Te3) including novel spherulites were crystallized … spills hotline ontarioWebJun 16, 2004 · A survey has been made of spherulites formed by the isothermal crystallization of polypropylene from the melt in the temperature range 110°–148°C. Four … spills constructionWebSpherulite is a spheriform aggregate of chain-folded fibrillar or lamellar primary crystallites. According to a simplified model, crystallites start from a central, pin-point type nucleus … spills in ohioWebNov 4, 2024 · Spherulites are the most common crystalline morphology and thus the visual expression of crystal structures for polymers. The diversified patterns have provided intuitive morphology probes for various crystallization behaviors, while the correlations between them are still needed to be enriched. spills computerWebNov 4, 2010 · Spherulitic crystals are found in association with many materials and diseases, but the fundamental formation mechanism is not well understood. Using maleic … spills golf balls in parking lot