Determination of surface hydroxyl groups on silanized silica gels for reversed-phase liquid chromatography

Nondek, L.; Vyskočil, Vlastimil

doi:10.1016/s0021-9673(00)88928-1

Cited by 50 publications

(12 citation statements)

References 11 publications

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“…The unreacted Si-CI or SiOR bonds will hydrolyse to Si-OH when the sample is exposed to moisture and, depending on the distance of the grafted groups, condensation between neighbouring -Si(OHhR or = Si(OH)R groups might be possible. It was shown that commercial silanized silicas contain more active hydrogen than the parent silicas [621]. Various authors suggested an after-treatment with trimethylchlorosilane or hexamethyldisilazane in order to minimize the concentration of silanol groups.…”

Section: B) Surface Esters and Surface Amidesmentioning

confidence: 99%

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Nature and Estimation of Functional Groups on Solid Surfaces

1983

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Section: B) Surface Esters and Surface Amidesmentioning

confidence: 99%

“…The surface area of a fine particle size silica will be significantly changed by the binding of a layer of a thickness which is not insignificant with respect to the particle radii [621,647]. Obviously, the pore structure of mesoor microporous substances will be influenced, too [647].…”

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confidence: 99%

Nature and Estimation of Functional Groups on Solid Surfaces

1983

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“…При взаимодействии ценосфер с водными растворами на их поверхности увеличивается содержание гидроксильных групп, по-видимому, связанных с атомами кремния и алюминия (полоса 3600-3760 см -1 в ИКспектре). К такому же заключению пришли авторы работ [11,12], которые обрабатывали ценосферы водяным паром, кипячением в воде и в 0,1 н. растворе HCl. По их расчетам концентрация силанольных групп, образующихся на поверхности ценосфер при соответствующих видах обработки, составляла 6,07, 2,49 и 2,19 групп/нм 2 .…”

Section: результаты экспериментов и обсуждениеunclassified

Investigation of Interactions in the Cenospheres- Electrolyte System

Fedyaeva¹,

Poshelyuzhnaya²

2019

DSMM

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A comparative study on the dissolution and solubility of hydroxylapatite and fluorapatite at 25 °C and 45 °C // Chemical Geology. 2009. Vol. 268. P. 89-96. 9. Солоненко А. П., Блесман А. И., Полонянкин Д. А. Нанокомпозиты на основе плохоокристаллизованного апатита, гидросиликата кальция и кальцита, полученные осаждением в водных растворах // Россия молодая: передовые технологии в промышленность. 2019. № 1. С. 165-169. 10. Titorenkova R., Dyulgerova E., Petkova V., Ilieva R. Carbonation and dehydroxylation of apatite during high energy milling of biphasic Ca-phosphate ceramics // Ceramics international. 2019. Vol. 45. P. 7025-7033. 11. Yu P., Kirkpatrick R. J., Poe B., McMillan P. F., Cong X. Structure of calcium silicate hydrate (C-S-H): near-, mid-, and far-infrared spectroscopy // J. Am. Ceram. Аннотация. Изучен химический состав ценосфер. Определены продукты их взаимодействия с водой, растворами соляной кислоты, гидроксида натрия и хлорида натрия. Установлено, что ценосферы растворяются в водных растворах независимо от pH. Предварительная обработка ценосфер в воде, растворах соляной кислоты и гидроксида натрия уменьшает их растворение в растворе хлорида натрия. Ионы кальция, гидрокарбонат ионы, силанольные и алюминольные группы поверхности участвуют в ионном обмене. Ключевые слова: ценосферы, растворение, тепловые эффекты, ионный обмен.

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“…The porosity parameters of bare Nucleosil 100 (S BET = specific surface area; V p = pore volume; D = mean pore [17] based on the GC determination of methane formed during the reaction of the dimethylzinc-tetrahydrofuran complex with accessible groups. The apparent density (q app ) was determined by modified pycnometric method [15,18,19].…”

Section: Apparatus and Physicochemical Measurementsmentioning

confidence: 99%

A comparative study of hydrophobicity of octadecyl and alkylamide bonded phases based on methylene selectivity

Gadzała‐Kopciuch

Buszewski²

2003

J of Separation Science

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A comparative study of hydrophobicity of octadecyl and alkylamide bonded phases based on methylene selectivityThe conformational dynamics of home-made monomeric and polymeric (octadecyl -C18 and alkylamide -AP) stationary phases have been investigated by analyzing the dependence of retention on the reciprocal temperature for different organic compounds. Theoretical considerations were based on the results of methylene selectivity determination. Two selected PAHs -naphthacene and benzo [a]anthracene, whose structures differ in the position of the ring -were chosen as solutes to study the thermodynamics of retention behavior. Standard enthalpies (DH 0 ) were obtained from the slope of the plots of the capacity factor logarithm (ln k) against the reciprocal temperature (1/T), i. e. van't Hoff plots, in a temperature range from 285 to 315 K. The conformation of the stationary phase (monomeric and polymeric) structure and the length of bonded ligands with their specific functional (N-acylamide) groups had a significant effect on retention.

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Determination of surface hydroxyl groups on silanized silica gels for reversed-phase liquid chromatography

Cited by 50 publications

References 11 publications

Nature and Estimation of Functional Groups on Solid Surfaces

Nature and Estimation of Functional Groups on Solid Surfaces

Investigation of Interactions in the Cenospheres- Electrolyte System

A comparative study of hydrophobicity of octadecyl and alkylamide bonded phases based on methylene selectivity

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