New Methodology to Study the Dispersive Component of the Surface Energy and Acid-Base Properties of Silica Particles by Inverse Gas Chromatography at Infinite Dilution

Tayssir Hamieh*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

A new methodology was proposed to determine the dispersive component of the surface energy ${\gamma}_s^d$ of a solid taking into account the effect of the temperature on the surface area of n-alkanes, methylene group (${a}_{- CH2-}$) and polar molecules, thus defeating the method used by Dorris-Gray Schultz et al. We determined the correct ${\gamma}_s^d$ of the surface energy, the specific free energy, enthalpy and entropy of adsorption of polar molecules as well as the acid base constants of silica particles with an excellent accuracy. We confirmed the dependence of the dispersive component of the surface energy on the variations of the surface areas of organic molecules used in IGC technique at infinite dilution. The specific properties of interactions of silica particles were determined. The new proposed model took into account this thermal effect. Obtained results proved that the other used IGC methods gave inaccurate values of the specific parameters of silica surface, except for the vapor pressure method that led to excellent results of the specific free energy, enthalpy and entropy of adsorption, and the acid-base constants of the silica particles.

Original languageEnglish
Article number066
Pages (from-to)126-142
Number of pages17
JournalJournal of Chromatographic Science
Volume60
Issue number2
Early online date7 Jun 2021
DOIs
Publication statusPublished - 16 Feb 2022
Externally publishedYes

Keywords

  • CHAIN-LENGTH
  • CHARACTERIZE PHYSICOCHEMICAL PROPERTIES
  • MOLECULE AREAS
  • N-ALKANES
  • PHARMACEUTICAL POWDERS
  • PYROGENIC SILICAS
  • SHORT GLASS-FIBERS
  • SOLID CHROMATOGRAPHY
  • TOPOLOGICAL INDEX
  • WATER SORPTION

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