Evaluation of specific interactions of solid surfaces by inverse gas chromatography

Donnet, Jean‐Baptiste; Park, Soo‐Jin; Balard, H.

doi:10.1007/bf02262385

Cited by 193 publications

(172 citation statements)

References 7 publications

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“…In this study, we used the model of Donnet et al, because the injected probe is in the gas state. 4) In this model, ÁG A is given by the following expressions:…”

Section: Theory Of Inverse Gas Chromatography (Igc) Atmentioning

confidence: 99%

Determination of Dispersive Properties of Silicas by Inverse Gas Chromatography: Variation with Surface Treatment

Yang

Yoon

2007

Mater. Trans.

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The application of inverse gas chromatography (IGC) to the examination of the surface properties of untreated crystalline and fused silica and surface-treated silicas with silane coupling agents is discussed. The carbon content of the silane coupling agents adsorbed on the surface of the silicas was determined by means of a Carbon Determinator. If the assumption is made that each silane coupling agent molecule occupies an area of 0:5$1 nm 2 , the adsorption amounts show that multilayers are generally adsorbed onto the silica surfaces. This paper presents and discusses the dispersive properties expressed by D S , the dispersive component of the surface free energy, as determined at various temperatures. At the same temperature of IGC measurement, the values of D S determined by IGC were lower for the crystalline silica than for the fused silica. This means that crystalline silica is more stable than fused silica. The silica surface-treated with -methacryloxy propyl trimethoxy silane (MTMS) shows a relatively high D S value(42.75 mJÁm À2 at 160 C). This means that this sample should be compatible with polyester(27 AE 3 mJÁm À2 at 290 C) at high temperature. The silicas that were surface-treated with -glycidoxy propyl trimethoxy silane (GMS) and -mercapto propyl trimethoxy silane (MCMS) exhibit IntroductionSilica has a broad variety of applications in industry. Silica has been treated with surface-modifying agents to obtain improved dispersibility, mechanical and electrical properties, water resistance and reinforcement in plastics systems.1) In this study, we used silane coupling agents as surfacemodifying agents for silica.The mechanical performance of a composite material strongly depends on the properties of the filler-matrix interface and, in particular, on the level of adhesion between the matrix and the reinforcing filler. The level of adhesion is determined by the surface energies of both adherents. The surface free energy, which describes the interaction potential of a given surface, has two components: the dispersive component originating from dispersive or London interactions, and the specific component due to all other types of interactions.Inverse gas chromatography (IGC) at infinite dilution conditions may be successfully applied to the determination of the surface properties of various solids.2) IGC allows the detection of the solid surface properties, using molecules of known properties, or probes, which are injected into a chromatographic column filled with the solid of interest.In this study, we chose IGC for the detection of the possible differences in the D S values of untreated crystalline and fused silica and silicas surface-treated with silane coupling agents. The IGC results are reported in this paper. Theory of inverse gas chromatography (IGC) atinfinite dilution In IGC under infinite dilution conditions, the retention volume V N is computed from the following expression (1):where t R is the retention time of the probes, t 0 the zero retention time measured with a nonadsorbing probe such a...

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“…In this study, we used the model of Donnet et al, because the injected probe is in the gas state. 4) In this model, ÁG A is given by the following expressions:…”

Section: Theory Of Inverse Gas Chromatography (Igc) Atmentioning

confidence: 99%

Determination of Dispersive Properties of Silicas by Inverse Gas Chromatography: Variation with Surface Treatment

Yang

Yoon

2007

Mater. Trans.

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“…Se ha elegido la representación de dichos volúmenes frente a la polarizabilidad molecular, ya que esta propiedad es independiente de la temperatura y, por ello, se puede usar en un amplio intervalo de temperaturas (desde -100 a unos 300 ºC) (20). Ambas figuras muestran una línea recta para los n-alcanos y una desviación de cada uno de los vapores específicos respecto a dicha línea.…”

Section: Energía Específica áCido-baseunclassified

“…The graphs for the other materials were similar, with the exception of the position of the specific vapour retention volumes. These volumes were plotted against molecular polarizability, for this property is independent of temperature and can therefore be used across a wide range of values (from -100 to around 300 ºC) (20). Both figures show a straight line for n-alkanes and the deviations for each of the specific vapours.…”

Section: Energía Específica áCido-basementioning

confidence: 99%

Caracterización superficial de distintos materiales de construcción

Rubio¹,

Sánchez²,

Elvira³

et al. 2006

Mater. construcc.

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RESUMENEn este trabajo se ha realizado la caracterización de la superficie de diferentes materiales de construcción (már-mol, arenisca, granito y ladrillo) mediante cromatografía inversa gas-sólido a dilución infinita. La energía superficial se puede dividir en dos componentes: dispersiva y ácido-base. Los valores obtenidos para la energía dispersiva son bastante parecidas para mármol, granito y ladrillo, mientras que el valor más alto corresponde a la arenisca. Además, este material presenta una menor variación de la energía dispersiva con la temperatura lo que indica que la interacción de cualquier sustancia con su superficie se dará a cualquier temperatura. Por lo que respecta a las componentes ácido-base, se ha observado que todos los materiales poseen ambas componentes lo que indica un carácter anfótero, sin embargo, la acidez es mayor en el granito y en el ladrillo, mientras que la basicidad es mayor en la arenisca y en el mármol.

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“…For the analysis, the method of Dorris and Gray was employed for the dispersive surface energy component (17). For the specific free energies of desorption, the Polarization approach was employed (18). Acid-base surface energy components were determined using the Good-van Oss-Chaudhury (GvOC) model (19,20) where the acid-base g À Á : The Gutmann acid-base theory was used to determine K b (base, electron donor) and K a (acid, electron acceptor) values (21).…”

Section: Characterization Techniquesmentioning

confidence: 99%

Effect of Processing Route on the Surface Properties of Amorphous Indomethacin Measured by Inverse Gas Chromatography

et al. 2012

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Abstract. The aim of this study was to investigate the effect of processing route (i.e., quench cooling and ball milling) on the surface energy heterogeneity and surface chemistry of indomethacin (IMC). Recently developed inverse gas chromatography (IGC) methodology at finite concentrations was employed to determine the surface energy distributions of crystalline, quench cooled and milled IMC samples. Surface properties of crystalline and processed IMC were measurably different as determined by the IGC and other conventional characterization techniques: differential scanning calorimetry and powder X-ray diffraction. Quench cooled IMC was in fully amorphous form. Milled IMC showed no amorphous character by calorimetric or X-ray diffraction studies. It was demonstrated that both processed IMC samples were energetically more active than the crystalline IMC. In particular, milled IMC exhibited a relatively higher dispersive surface energy and higher surface basicity (electron donor capability). This may be attributed to the creation of surface defect sites or exposure of higher energy crystal facets during the milling process. This study confirms that processing route has notable influence on the surface energy distribution and surface acid-base character. IGC was demonstrated as a powerful technique for investigating surface properties of real-world, heterogeneous pharmaceutical materials.

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Evaluation of specific interactions of solid surfaces by inverse gas chromatography

Cited by 193 publications

References 7 publications

Determination of Dispersive Properties of Silicas by Inverse Gas Chromatography: Variation with Surface Treatment

Determination of Dispersive Properties of Silicas by Inverse Gas Chromatography: Variation with Surface Treatment

Caracterización superficial de distintos materiales de construcción

Effect of Processing Route on the Surface Properties of Amorphous Indomethacin Measured by Inverse Gas Chromatography

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