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Wettability of Psoralen Powders: Influence of Bile Salts on Their Contact Angles and Surface Free Energy Components by A. Saïd; A. Mavon; S. Makki; Ph. Humbert; J. Millet is a Materials Science article available to read on EtoBox.

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The purpose of this work was to assess the surface free energy (SFE) of bare and bile-salt-precontacted pellet surfaces of psoralens (lipophilic molecules). This study was carried out according to the approach of van Oss et al. to the solid-liquid interfacial free energy using the Lifshitz-van der Waals component, electron acceptor and electron donor parameters of the SFE. With the help of a hydraulic press, powders of 8-methoxypsoralen (8-MOP), 5-methoxypsoralen (5-MOP) and 4,5',8-trimethylpsoralen (TMP) were compacted sufficiently to obtain smooth and glossy disc surfaces. One set of pressed discs was used directly after preparation and another set was treated with a bile salt (sodium cholate/sodium deoxycholate mixture) aqueous solution of 0.1 mol 1-1 for 2 h at 37 °C before droplet deposition. The surface free energies of bare and bile-salt-treated discs were determined by advancing contact angles using polar (water and formamide) and apolar (diiodomethane) standard liquids. The measurements were carried out at 21.5 + 1.5°C using a surgical microscope fitted with a slanted mirror and equipped with a video camera linked to a computer. In addition, the surface and interfacial ten

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Author

A. Saïd; A. Mavon; S. Makki; Ph. Humbert; J. Millet

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0927-7765)

Published

1997

Language

EN

Field

Materials Science (Physical Sciences)