title: Thermodynamics of organic molecule adsorption on sorbents modified with 5-hydroxy-6-methyluracil by inverse gas chromatography.
abstract: The thermodynamic features of organic molecule adsorption from the gaseous phase of sorbents modified with 5-hydroxy-6-methyluracil (HMU) were studied. Molar internal energy and entropy of adsorption variation analyses showed that with every type surface, except for silica gel, layers of supramolecular structure have cavities equal in size with the ones revealed in HMU crystals by X-ray diffraction. Adsorption thermodynamics on HMU-modified sorbents depended on the amount of impregnated HMU and on the polarity, but not the porosity, of the initial sorbent. Polarity of the modified surface increased as a function of HMU quantity and initial sorbent mean pore size, but become appreciably lower if the initial surface is capable of hydrogen bonding.
authors.affiliation: Bashkir State University, Zaki Validi Str., Ufa, Russia. Electronic address: guscov@mail.ru.
authors.forename: Vladimir Yu
authors.initials: VY
authors.lastname: Gus'kov
authors.affiliation: Bashkir State University, Zaki Validi Str., Ufa, Russia.
authors.forename: Yulia Yu
authors.initials: YY
authors.lastname: Gainullina
authors.affiliation: Bashkir State University, Zaki Validi Str., Ufa, Russia.
authors.forename: Sergey P
authors.initials: SP
authors.lastname: Ivanov
authors.affiliation: Bashkir State University, Zaki Validi Str., Ufa, Russia.
authors.forename: Florida Kh
authors.initials: FKh
authors.lastname: Kudasheva
mesh_terms: D000327:Adsorption; D000438:Alcohols / Q000737:chemistry; D000473:Alkanes / Q000737:chemistry; D002849:Chromatography, Gas; D018360:Crystallography, X-Ray; D019277:Entropy; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D010432:Pentoxyl / Q000031:analogs & derivatives* / Q000737:chemistry; D016062:Porosity; D013499:Surface Properties
chemical_list: D000438:Alcohols; D000473:Alkanes; C008055:5-hydroxymethyluracil; D010432:Pentoxyl
keywords: 5-Hydroxy-6-methyluracil; Cavity; Inverse gas chromatography; Supramolecular structure; Thermodynamic function of adsorption