Méthodes et appareils employés au Bureau des étalons physico‐chimiques. XII Recherches sur les germes de cristallisation

Rooster, J. De

doi:10.1002/bscb.19480570411

Cited by 3 publications

(1 citation statement)

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“…Differences in the melting temperatures in the same material are associated with the existence of two polymorphic forms. One can remind that the first, stable, phase is characterized by orthorhombic crystal system ( T m I = 315 K) and second, metastable, is monoclinic with T m II = 302 K. ,− The form II is unstable and readily undergoes solid–solid monotropic transition to the stable phase during spontaneous transformation. , …”

Section: Resultsmentioning

confidence: 99%

Crystallization Kinetics under Confinement. Manipulation of the Crystalline Form of Salol by Varying Pore Diameter

Kołodziejczyk

Tarnacka

Kamińska

et al. 2016

Crystal Growth & Design

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The crystallization and melting behavior of phenyl salicylate under confinement were studied by means of dielectric spectroscopy (BDS) and differential scanning calorimetry (DSC). From the analysis of the kinetics of crystallization we established that crystals formed in bulk and under confinement are characterized by varying the rate of growth, dimensionality, and crystal lattice. It was shown that depending on the degree of confinement the crystallization can be accelerated or suppressed completely. Interestingly, we also found that the activation barrier for the crystallization either increases or decreases with respect to the bulk conditions. Further investigation of the melting temperature of the formed crystals indicated unequivocally that it is connected to the formation of different polymorphic forms of salol. Additional FTIR measurements confirmed that thesis. Based on calorimetric data obtained for the confined samples, we concluded that at pores of higher diameter the unstable (monoclinic) form is preferred, while at lower pores the original stable (orthorhombic) crystal is formed.

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