Adsorption characteristics of octadecylsilyl‐silica gel in gaseous systems

Miyabe, Kanji; Suzuki, Motoyuki

doi:10.1002/aic.690391107

Cited by 24 publications

(30 citation statements)

References 36 publications

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“…On the other hand, the ratios of activation energy of surface diffusion to isosteric heat of adsorption are ranging from 0.4 to 0.6 in gaseous systems. These values agree with other experimental results reported for surface diffusion (Awum et al, 1988;Chihara et al, 1978;Gilliland et al, 1974;Kawazoe et al, 1974;Ruthven and Doetsch, 1976;Schneider and Smith, 1968;Sladek et al, 1974;Miyabe and Suzuki, 1993b). In previous articles Suzuki, 1992, 1993a1, we reported properties of adsorption of p-tert-octylphenol onto the surface of ODS in a reversed-phase liquid chromatographic system.…”

Section: Experimental Data: Gas-us Liquid-phase Adsorptionsupporting

confidence: 94%

Solvent effect on adsorption phenomena in reversed‐phase liquid chromatography

Miyabe

Suzuki

1995

AIChE Journal

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Section: Experimental Data: Gas-us Liquid-phase Adsorptionsupporting

confidence: 94%

Solvent effect on adsorption phenomena in reversed‐phase liquid chromatography

Miyabe

Suzuki

1995

AIChE Journal

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“…It is indicated that the ratio of E s to (-Q st ) in RP-LC ranges from about 0.6 to 0.7. This result is consistent with the experimental data in a gaseous system 29 and with the results obtained by analyzing the relationship between ln D s and the ratio T b /T in Fig. 5.…”

Section: Linear Free-energy Relationsupporting

confidence: 82%

“…5, it is indicated that E s is about 0.25-times (-Q st ). This result is consistent with the ratio E s /(-Q st ), experimentally determined in gas phase adsorption using ODS-silica gel particles 29 , i.e., 0.3 -0.6. It is concluded by analyzing the correlation between ln D s and T b /T that E s is essentially smaller than (-Q st ) in RP-LC as well as gaseous systems.…”

Section: Correlation Of D S and The Molar Volume At The Normal Boilinsupporting

confidence: 79%

Effect of the Type of Organic Modifiers on Mass Transfer in Reversed-Phase Liquid Chromatography

Miyabe

Takeuchi

1998

ANAL. SCI.

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Methanol/water and acetonitrile/water mixtures have generally been used as a mobile phase in reversedphase liquid chromatography (RP-LC). Chromatographic separations are significantly affected by the mobile-phase conditions, such as the type and composition of the organic modifiers. A number of studies have been made on the influence of the mobile-phase conditions on the retention behavior in RP-LC in connection with the specification of the separation mechanism and with the establishment of optimization strategies for chromatographic conditions.It is also essential to analyze the chromatographic processes from the viewpoints of mass-transfer kinetics and the thermodynamic properties as well as the retention behavior in order to understand the separation mechanism in RP-LC. However, there have not been very many kinetic studies on mass-transfer phenomena in RP packing materials [1][2][3][4] , in contrast to the extremely extensive studies on chromatographic retention. The authors have studied mass-transfer phenomena in RP-LC using mainly methanol/water and octadecylsilyl (ODS)-silica gel as mobile and stationary phases. 5-8Pulse-response experiments were made under various conditions of the solutes as well as the stationary and mobile phases. Their type, composition, and concentration were changed. Some items of information about the retention behavior, mass-transfer rates, and thermodynamic properties in RP-LC were obtained.This paper is concerned with the influence of the type of organic modifiers in the mobile phases on the chromatographic properties in RP-LC. The information about the retention behavior, mass-transfer rates, and thermodynamic properties were determined by using a mixture of acetonitrile and water (70/30, v/v) and an ODS-silica gel as a mobile and stationary phase. In a previous paper 9 , the authors reported on results of a similar study using alkylbenzenes and p-alkylphenols as solutes. In this study, the characteristics of the RP-LC system were analyzed in more detail using more solutes than before. In particular, it was attempted to correlate the surface diffusion coefficient (D s ) with various physical parameters of the solutes. The results in 70 vol% acetonitrile were compared with those in 70 vol% methanol. On the basis of the results, a few estimation procedures of D s have been proposed. In this paper, the mass-transfer and concentration phenomena of solutes from a bulk mobile phase to the surface of ODS-silica gel is represented by the word "adsorption" in a wide sense. The mechanism of the mass transfer, i.e., "partition or adsorption", is not defined. Experimental Column and reagentsSeveral properties of an ODS column (YMC) and the experimental conditions are given in Table 1. An ODS column packed with relatively large ODS-silica gel particles was used in order to make it easy to quantitatively analyze the influence of the mass-transfer rates on the peak spreading. The volumetric composition of acetonitrile was 70%, which was selected as a typical value of mobile-phase compositio...

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“…The ratio of isosteric heat of adsorption to heat of vaporization, a , was found to range from 1.0 to 1.4 (Miyabe and Suzuki, 1993b). Isosteric heat of adsorption can also be related to Th:…”

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confidence: 93%

“…Energetical uniformity of the surface of ODS was also confirmed from analyses of adsorption equilibrium and thermodynamic parameters. Moreover, we determined adsorption rates and thermodynamic parameters in a gaseous system (Miyabe and Suzuki, 1993b). It was concluded that the contribution of intraparticle diffusion to the overall mass transport resistance in ODS column was dominant and the role of surface diffusion was significant for the intraparticle diffusion.…”

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confidence: 99%