crystal height increased rapidly in the first 5 min of crystallization time, then proceeded more slowly. Approximately 40% of the height attained in 10rain was reached in l min; 75% of this height was reached in 5 min. The width of the lamellae did not vary with crystallization time. These results are in accordance with previous data obtained for epitaxial crystallization of polyethylene [1], a...

The enzyme lysozyme served as a prototype to study the early stages of protein crystallization or precipitation. The crystallization and precipitation aggregates reactions were initiated by supersaturating the lysozyme solutions through addition of NaCI and (NH4)2S04 respectively and monitored via photon correlation spectroscopy. Laplace inversion of the spectra revealed in general bimodal part...

We employ dielectric spectroscopy to monitor the relaxation dynamics and crystallization kinetics of the Biclotymol antiseptic in its amorphous phase. The glass transition temperature of the material as determined by dielectric spectroscopy is Tg = 290 ± 1K. The primary (α) relaxation dynamics is observed to follow a Vogel-Fulcher-Tammann temperature dependence, with a kinetic fragility index m...

Isothermal crystallization studies were performed on the bulk glass forming alloy Pd40Cu30Ni10P20 in the undercooled liquid region between the glass transition and liquidus temperature, resulting in a complete time–temperature–transformation ~TTT! diagram for crystallization. The TTT diagram shows a typical ‘‘C’’ shape with the nose at 50 s and 680 K. Assuming steady state nucleation and a diff...

A bulk metallic glass forming alloy is subjected to shear flow in its supercooled state by compression of a short rod to produce a flat disk. The resulting material exhibits enhanced crystallization kinetics during isothermal annealing as reflected in the decrease of the crystallization time relative to the nondeformed case. The transition from quiescent to shear-accelerated crystallization is ...

High temperature high vacuum electrostatic levitation was used to determine the complete time– temperature–transformation ~TTT! diagram of the Zr41.2Ti13.8Cu12.5Ni10.0Be22.5 bulk metallic glass forming alloy in the undercooled liquid state. This is the first report of experimental data on the crystallization kinetics of a metallic system covering the entire temperature range of the undercooled ...

in this study, the effect of recrystallization of naproxen in the presence of hydroxypropyl cellulose (hpc) on the release rate of drug was investigated. crystals were generated by the anti-solvent approach using the hpc solution in water as the anti-solvent. the samples were subjected to various physicochemical evaluations such as crystal size, scanning electron microscopy, fourier transform i...

The problem of crystal sizes is one of the central problems of differentiation of a terrestrial magma ocean and it has been an arbitrary parameter in previous models. The crystal sizes are controlled by kinetics of nucleation and crystal growth in a convective magma ocean. In contrast with crystallization in magma chambers, volcanic lavas, dikes, and other relatively well studied systems, nucle...

[1] Abstract: Analysis of crystal size distributions (CSD) of plagioclase in gabbros from the Oman ophiolite indicates that cooling rates in the lower crust beneath a mediumto fast-spreading oceanic ridge did not vary smoothly with depth. Cooling rates in the upper half of the gabbro section were approximately 1.5–2 times faster than in the lower half of the gabbro section during igneous crysta...