Homogeneous nucleation kinetics of polymorphic phases in solution

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F17%3A00483457" target="_blank" >RIV/68378271:_____/17:00483457 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Homogeneous nucleation kinetics of polymorphic phases in solution

Popis výsledku v původním jazyce

In our model, which includes nucleation, growth, and Ostwald ripening, the number density of nuclei of polymorphic phases is determined by numerical solution of kinetic equations. As a model system the L-glutamic acid (LGlu), which exhibits two monotropic polymorphs: a LGlu and b LGlu, was considered. Decrease of supersaturation during phase transition, due to formation of polymorphic phases, was taken into account. The critical sizes of nuclei of both phases increase with time as supersaturation decreases. Consequently, supercritical nuclei become undercritical and have tendency to diminish. The number of subcrictical clusters decreases, i.e. nucleation rate reaches negative values.nSuch a behavior is in coincidence with Ostwald rule of stages, when large particles growt at the expense of small particles. Numerical results reflects well known experimental data at temperatures T=5, 20 and 40 oC.

Název v anglickém jazyce

Homogeneous nucleation kinetics of polymorphic phases in solution

Popis výsledku anglicky

In our model, which includes nucleation, growth, and Ostwald ripening, the number density of nuclei of polymorphic phases is determined by numerical solution of kinetic equations. As a model system the L-glutamic acid (LGlu), which exhibits two monotropic polymorphs: a LGlu and b LGlu, was considered. Decrease of supersaturation during phase transition, due to formation of polymorphic phases, was taken into account. The critical sizes of nuclei of both phases increase with time as supersaturation decreases. Consequently, supercritical nuclei become undercritical and have tendency to diminish. The number of subcrictical clusters decreases, i.e. nucleation rate reaches negative values.nSuch a behavior is in coincidence with Ostwald rule of stages, when large particles growt at the expense of small particles. Numerical results reflects well known experimental data at temperatures T=5, 20 and 40 oC.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

<a href="/cs/project/LD15004" target="_blank" >LD15004: Kinetika nukleace krystalů v uzavřených systémech</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů