On the origin of surface imposed anisotropic growth of salicylic and acetylsalicylic acids crystals during droplet evaporation - Publikacja - MOST Wiedzy

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On the origin of surface imposed anisotropic growth of salicylic and acetylsalicylic acids crystals during droplet evaporation

Abstrakt

In this paper droplet evaporative crystallization of salicylic acid (SA) and acetylsalicylic acid (ASA) crystals on different surfaces, such as glass, polyvinyl alcohol (PVA), and paraffin was studied. The obtained crystals were analyzed using powder X-ray diffraction (PXRD) technique. In order to better understand the effect of the surface on evaporative crystallization, crystals deposited on glass were scraped off. Moreover, evaporative crystallization of a large volume of solution was performed. As we found, paraffin which is non-polar surface promotes formation of crystals morphologically similar to those obtained via bulk evaporative crystallization. On the other hand, when crystallization is carried out on the polar surfaces (glass and PVA), there is a significant orientation effect. This phenomenon is manifested by the reduction of the number of peaks in PXRD spectrum recorded for deposited on the surface crystals. Noteworthy, reduction of PXRD signals is not observed for powder samples obtained after scraping crystals off the glass. In order to explain the mechanism of carboxylic crystals growth on the polar surfaces, quantum-chemical computations were performed. It has been found that crystal faces of the strongest orientation effect can be characterized by the highest surface densities of intermolecular interactions energy (IIE). In case of SA and ASA crystals formed on the polar surfaces the most dominant faces are characterized by the highest adhesive and cohesive properties. This suggests that the selection rules of the orientation effect comes directly from surface IIE densities.

Cytowania

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Autorzy (5)

  • Zdjęcie użytkownika  Piotr Cysewski

    Piotr Cysewski

  • Zdjęcie użytkownika  Maciej Pawelec

    Maciej Pawelec

  • Zdjęcie użytkownika  Dorota Ziółkowska

    Dorota Ziółkowska

  • Zdjęcie użytkownika  Mirosław Kobierski

    Mirosław Kobierski

Informacje szczegółowe

Kategoria:
Publikacja w czasopiśmie
Typ:
Publikacja w czasopiśmie
Opublikowano w:
JOURNAL OF MOLECULAR MODELING nr 21, wydanie 3,
ISSN: 1610-2940
Rok wydania:
2015
DOI:
Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.1007/s00894-015-2599-z
Weryfikacja:

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