Results 241 to 250 of about 304,137 (289)
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Seeded isothermal batch crystallization of lysozyme
Biotechnology and Bioengineering, 2006AbstractThe kinetics of lysozyme crystallization under seeded isothermal batch conditions was followed by measurement of the decline in solution concentration versus time. Kinetics were measured for five different values of the seed crystal mass. The data were analyzed using a recently proposed mathematical model.
Martina N, Carbone, Mark R, Etzel
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Non-isothermal crystallization of fluoropolymers
Journal of Fluorine Chemistry, 1992Abstract Crystallization kinetics of polymers has received increasing attention since the pioneering work on isothermal crystallization by Avrami in 1939 [M. Avrami, J. Chem. Phys. 7 (1939) 1103.]. More recently the need to understand crystallization phenomena under non-isothermal conditions has forced many researchers to propose modifications of the
M. Fontelos, C. Pizzi, G. Crafa
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Isothermal etching of calomel crystals
Journal of Crystal Growth, 1981The process of isothermal etching of calomel (mercurous chloride) crystals in vacuo in the temperature range 80–180°C was studied. The sublimation rate depends not only on temperature but also on the crystallographic orientation. The ratio of the sublimation rate from (001) to that from (110) being roughly 5:1. The relation between chemical bonding and
J. Trnka, J. Žemlička
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Non-isothermal Crystallization of UHMWPE
Journal of Thermal Analysis and Calorimetry, 1999Processing of Ultra High Molecular Weight Polyethylene (UHMWPE) parts involves non-isothermal cooling leading to crystallinity variations, which cause variations in the mechanical properties. Study of non-isothermal crystallization kinetics of UHMWPE forms the basis for process modelling.
N. C. Parasnis, K. Ramani
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Isothermal and nonisothermal crystallization of polyethylene
Polymer Engineering & Science, 1983AbstractDifferential scanning calorimetry is employed to study the crystallization kinetics of two commercial injection‐molding high‐density polyethylene resins. Also, polarized light microscopy has been used to elucidate the morphological structures formed at various crystallization conditions.
Musa R. Kamal, Edward Chu
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Comparison of crystallization kinetics determined by isothermal and non-isothermal methods
Thermochimica Acta, 1987Abstract Theoretical results for nucleation and growth controlled transformations indicate that a non-isothermal generalization is only possible along the lines of the isokinetic hypothesis, i.e., the invariance of the rate equation under any thermal conditions.
T. Kemény, J. Šesták
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The crystallization kinetics of polyethylene under isothermal and non-isothermal conditions
Polymer, 1989Abstract The work presented here is concerned with relationships between isothermal and non-isothermal crystallization kinetics in high-density polyethylene. First, information on the nucleation, growth and transformation rates during isothermal crystallization is presented and a time-temperature-transformation diagram is produced.
S. Chew, J.R. Griffiths, Z.H. Stachurski
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Size of a crystal nucleus in the isothermal crystallization of supercooled liquid
The Journal of Chemical Physics, 2013We present an alternative to classical nucleation theory (CNT). We introduce a size-dependent surface energy into the total Gibbs free-energy of formation of a crystal (ΔG). We consider the free-energy in the core part of the total volume of crystal and the free-energy in the surface-layer part of it, separately, for the evaluation of ΔG.
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Isothermal and non-isothermal crystallization kinetics of zinc-aluminosilicate glasses
Thermochimica Acta, 2001Isothermal and non-isothermal differential thermal analysis (DTA), and X-ray diffraction (XRD) were used to study the nucleation and crystallization behavior of multicomponent Li2O-ZnO-Al2O3-B2O3-SiO2 glasses with ZrO2 and TiO2 as nucleating agents. The temperature of maximum nucleation rate for investigated glasses was found to be 1028 K.
Tkalčec-Čižmek, Emilija +2 more
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Thermochimica Acta, 1991
Abstract The alloy Co33Zr67 crystallizing from the amorphous state was examined calorimetrically. The theory used for the description of the energy release is based on a Markov process that allows the description of static and dynamic (re-)crystallization.
I.R. Göbel, M.M. Nicolaus
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Abstract The alloy Co33Zr67 crystallizing from the amorphous state was examined calorimetrically. The theory used for the description of the energy release is based on a Markov process that allows the description of static and dynamic (re-)crystallization.
I.R. Göbel, M.M. Nicolaus
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