Influence of flow parameters of the mobile phase on the retention and thermodynamic characteristics of sorption in gas-liquid chromatography

Onuchak, L. A.; Kudryashov, S. Yu.; Arutyunov, Yu. I.; Davankov, V. A.

doi:10.1134/s0036024406080267

Cited by 9 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Standard thermodynamic functions (enthalpy and entropy ) of sorption of organic com pounds under conditions of a distributive mechanism of sorption are characterized by a change in these functions upon transition of 1 mol of gaseous sorbate under ideal gas conditions at P st = 1 atm and column temperature to an infinitely dilute solution in the sta tionary liquid phase [6]. The calculated values of and for mesophase N* and isotropic phase I of the binary sorbent are presented in Table 4.…”

Section: Resultsmentioning

confidence: 99%

“…Dimensionless con stants of sorption ( = 1 atm, = ) [6], activity coefficients (a symmetric reference system) characterizing deviation from Raoult's law when small samples of sorbate are dis solved in a stationary liquid phase, and the standard and excess thermodynamic characteristics of sorption along with factors of isomer separation,…”

Section: Sorption and Selective Properties Of Binary Liquid Crystallimentioning

confidence: 99%

See 1 more Smart Citation

Sorption and selective properties of binary liquid-crystalline sorbent based on 4-Methoxy-4′-ethoxyazoxybenzene and a cetylated β-Cyclodextrin

Onuchak¹,

Burmatnova²,

Spiryaeva³

et al. 2012

Russ. J. Phys. Chem.

Self Cite

View full text Add to dashboard Cite

The mesomorphous, sorption, and selective properties of a binary sorbent based on achiral liquid crystal 4 methoxy 4' ethoxyazoxybenzene and macrocyclic heptakis(2,3,6 tri O acetyl) β cyclodextrin (10.25 wt %) are investigated. Macrocyclic additive was found to induce the formation of a helically twisted nematic phase (N*). The standard and excess thermodynamic functions of sorption by binary sorbent from gaseous phase are determined for 29 organic compounds (n alkanes, cycloalkanes, arenes, monoatomic alco hols, heterocycles, optical isomers of camphene, limonene, and butanediol 2,3). The investigated sorbent is found to have high structural selectivity over the wide temperature range of the N* mesophase (α p/m = 1.11-1.06, 95-120°C) and moderately expressed enantioselectivity within the narrow region of transition from the solid crystalline state to the N* mesophase (α +/-= 1.024-1.088, 91-100°C).

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Sorption and Selective Properties Of Binary Liquid Crystallimentioning

confidence: 99%

Sorption and selective properties of binary liquid-crystalline sorbent based on 4-Methoxy-4′-ethoxyazoxybenzene and a cetylated β-Cyclodextrin

Onuchak¹,

Burmatnova²,

Spiryaeva³

et al. 2012

Russ. J. Phys. Chem.

Self Cite

View full text Add to dashboard Cite

show abstract

“…). Взаимосвязь K H с V g T в условиях линейной равновесной модели ГЖХ дана в работе [23]: Для оценки влияния добавки Ас-Ts-β-CD в ЖК на стандартные термодинамические функции сорбции рассчитывали разности этих величин, полученных на колонках с бинарной (LC-CD) и исходной (LC) неподвижными фазами:…”

Section: экспериментunclassified

Sorption and Selective Properties of the "Supramolecular Liquid Crystal – Acetyltosilized β-Cyclodextrin" Binary Sorbent in Gas Chromatography Conditions

Tugareva¹,

Onuchak²,

Kuraeva³

et al. 2017

Liq. Cryst. and their Appl.

Self Cite

View full text Add to dashboard Cite

Изучены мезоморфные и сорбционные свойства бинарной системы, содержащей супрамолекулярный смектико-нематический жидкий кристалл 4-(3-гидроксипропилокси)-4'-формилазобензол (ГПОФАБ) и добавку (10 мас. %) гептакис-(2,3-ди-О-ацетил-6-О-тозил)-β-циклодекстрина (Ас-Ts-β-CD). Установлено, что внесение в ГПОФАБ хирального макроциклического Ас-Ts-β-CD не изменяет типа мезофаз (S A , N), но приводит к искажению текстуры вследствие сильно выраженной сольватации «ЖКмакроцикл». Термодинамические характеристики сорбции из газовой фазы 25 немезогенных сорбатов (углеводородов и спиртов с ациклическим и циклическим строением) изучены методом обращенной газожидкостной хроматографии. Установлено, что вследствие сольватации связывание молекул сорбатов с макроциклом происходит за счет инклюзионного комплексообразования, в большей степени выраженного для углеводородов. Исследованная бинарная система обладает высокой селективностью по отношению к пара-и мета-ксилолам (α п/м = 1,18, Т = 110 °С) и умеренно выраженной энантиоселективностью по отношению к изомерам камфена и бутандиола-2,3. Ключевые слова: супрамолекулярный жидкий кристалл, бифункциональное производное β-циклодекстрина, бинарный сорбент, газо-жидкостная хроматография, термодинамика сорбции, структурная селективность, энантиоселективность, комплексы включения «гость-хозяин».

show abstract

“…The temperature dependence of the specific retention volume V g allows one to calculate the enthalpy of sorption Δ H S : Some researchers proposed to consider the changes of inner energy U 1 S instead of enthalpy of sorption Δ H S . Since Δ H S = U 1 S + RT , at typical temperature of chromatographic experiment about 400 K, the correction RT is about 3 kJ/mol, i.e., small in comparison with the reported Δ H S values.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Polymers by Inverse Gas Chromatography

Yampolskii

Белов

2015

Macromolecules

View full text Add to dashboard Cite

This Perspective conveys to the general reader of Macromolecules the basic ideas and possibilities of inverse gas chromatography (IGC). This method which appeared about 50 years ago is now a versatile tool for investigation of the interactions of polymers with vapors and study of polymer properties. The focus of this Perspective is on the study of bulk sorption of low molecular weight compounds in polymers. The results of chromatographic determination of solubility coefficients and sorption isotherms as well as the diffusion coefficients of vapors in polymers are discussed. Special attention is paid to the thermodynamic properties of glassy polymers on the phenomena in the vicinity of the glass transition. Information on IGC as a probe method for the determination of free volume in polymers is also presented.

show abstract

Influence of flow parameters of the mobile phase on the retention and thermodynamic characteristics of sorption in gas-liquid chromatography

Cited by 9 publications

References 4 publications

Sorption and selective properties of binary liquid-crystalline sorbent based on 4-Methoxy-4′-ethoxyazoxybenzene and a cetylated β-Cyclodextrin

Sorption and selective properties of binary liquid-crystalline sorbent based on 4-Methoxy-4′-ethoxyazoxybenzene and a cetylated β-Cyclodextrin

Sorption and Selective Properties of the "Supramolecular Liquid Crystal – Acetyltosilized β-Cyclodextrin" Binary Sorbent in Gas Chromatography Conditions

Investigation of Polymers by Inverse Gas Chromatography

Contact Info

Product

Resources

About