Critical and wetting transitional adsorption behaviour in a liquid system against vapour and other walls

Huruguen, J. P.; Amara, Mongi Ben; Méar, Anne-Marie; Hamraoui, H; Olier, R.; Privat, Mireille

doi:10.1088/0953-8984/13/21/320

Cited by 3 publications

(2 citation statements)

References 26 publications

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“…While the Langmuir technique and BAM yielded information about the behavior of LC spread on aqueous NaCl solution used as a model polar surface, DSC made it possible to determine characteristic parameters of phase transitions and multilayer formation in LC adsorbed on silica and on diatomit (Chromosorb WHP). Analogies between water and silica surfaces in the interactions with organic probe molecules were showed recently . Indeed, while the anchoring of LC molecules on the water and silica is different due to a different structure of the two surfaces, it can be proposed that the effect of the polar surface on the molecule orientation and ordering is very similar.…”

Section: Introductionmentioning

confidence: 93%

Organization of Four Thermotropic Liquid Crystals of Different Polarities on Model Liquid and Solid Surfaces

Badis¹,

Guermouche²,

Bayle³

et al. 2004

Langmuir

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The thermodynamic and surface properties of four structurally related thermotropic liquid crystals (LC) were investigated to understand their organization at gas-liquid and gas-solid interfaces. In this study, LC with a benzoyloxy azobenzene mesogenic core substituted with heptyloxy and/or dioxyethylene ether groups were used. The propensity of the LC to form self-assembled multilayers was demonstrated in the films spread at the air/aqueous interface using the Langmuir technique and Brewster angle microscopy and on the solid surfaces of Chromosorb WHP and silica, using differential scanning calorimetry. On the basis of the results obtained, a molecular recognition mechanism underlying separation processes using LC as selectors in gas chromatography is proposed.

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Section: Introductionmentioning

confidence: 93%

Organization of Four Thermotropic Liquid Crystals of Different Polarities on Model Liquid and Solid Surfaces

Badis¹,

Guermouche²,

Bayle³

et al. 2004

Langmuir

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show abstract

“…First, surface changes governed by interactions with a wall can be evidenced only on homogeneous surfaces; in the case of heterogeneity, the influence of the several surface microdomains with different properties leads to a mean effect which suppresses any observation of a first-order transition. The second key feature about the wall is its chemical nature . In material systems, chemistry mainly rules the molecular interactions and, among them, those between the wall and the adsorbed particles of concern.…”

Section: Resultsmentioning

confidence: 99%

Surface Phase Diagrams: Evidence of Molecular Arrangements at the Aqueous-Solution/Solid Interface

et al. 2004

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Surface state changes described as phase transitions or simple molecular rearrangements have become a key issue in modern science. Indeed, they have an impact on the development of numerous (nano)technologies; they are also involved in biochemical and chemical mechanisms at the molecular level and also in environmental phenomena. At last, they have been at the origin of flourishing statistical descriptions that have illuminated new and very interesting aspects of surface behaviors. Here, to obtain still lacking coherent sets of experimental data on systems in which molecular interactions and thermodynamic properties are different, the adsorption behaviors of three aqueous mixtures in contact with a dense and homogeneous silica were studied versus concentrations and temperatures. Of course, these mixtures displayed very different bulk phase properties. Their stairlike isotherms are interpreted through surface phase diagrams; each of them is very similar to the corresponding bulk phase diagram. Their comparison gives new insights into the different surface states, the role of solvent in the surface, and the probable molecular mobility.

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Coadsorption at the air/water interface likely explains some pollutants transfer to the atmosphere: benzene and lead case

Sadiki

Quentel

Elléouet

et al. 2003

Atmospheric Environment

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Critical and wetting transitional adsorption behaviour in a liquid system against vapour and other walls

Cited by 3 publications

References 26 publications

Organization of Four Thermotropic Liquid Crystals of Different Polarities on Model Liquid and Solid Surfaces

Organization of Four Thermotropic Liquid Crystals of Different Polarities on Model Liquid and Solid Surfaces

Surface Phase Diagrams: Evidence of Molecular Arrangements at the Aqueous-Solution/Solid Interface

Coadsorption at the air/water interface likely explains some pollutants transfer to the atmosphere: benzene and lead case

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