Surface Properties of Dilute Solutions of Alkanes in Benzyl Alcohol

Abstract

Surface tensions of dilute solutions of cyclohexane, hexane, heptane, and nonane in benzyl alcohol were measured at various temperatures. Surface mole fractions were obtained from an extended Langmuir model. The results show that all of alkanes are surface active in benzyl alcohol and that their surface mole fractions are higher than their bulk mole fractions. The lyophobicity of solutes decreases with increasing temperature.

Refractive Index, Surface Tension, and Density of Aqueous Mixtures of Carboxylic Acids at 298.15 K

“…The EL model was applied to these mixtures in order to interpret the results obtained. The EL model allows for the behavior analysis of binary systems that deviate either positively or negatively from ideality. − Briefly, it considers the surface of a binary liquid mixture as a thin but finite layer and starts by developing the following expression for the relationship between the volume fractions of component B in the surface and the bulk, and φ B , respectively: where the parameter β = ( /φ B )/( /φ A ) is a measure of the lyophobicity of B relative to A. The second ingredient of the EL model is a mixing rule with a Margules-type term: where σ A and σ B are the surface tensions of the pure components A and B, π 0 is the positive difference between them (A is the component of higher surface tension), and λ is a parameter that represents the effect of unlike-pair interactions on the surface tension of the mixture and is zero when this effect is negligible.…”

“…The EL model allows for the behavior analysis of binary systems that deviate either positively or negatively from ideality. [24][25][26] Briefly, it considers the surface of a binary liquid mixture as a thin but finite layer and starts by developing the following expression for the relationship between the volume fractions of component B in the surface where the parameter β ) (φ B S /φ B )/(φ A S /φ A ) is a measure of the lyophobicity of B relative to A. The second ingredient of the EL model is a mixing rule with a Margules-type term:…”

Vapor-liquid interfacial properties of the system cyclohexane + CO2: Experiments, molecular simulation and density gradient theory

“…Azizian & Bashavard [136] 293.15 -323. 15 Azizian et al [137] 293.15 -313. 15 Campbell & Anand [138] 298.15 -323.…”

Refractive Indices, Molar Refractions, Surface Tension and Polarizability For Binary Mixtures of Benzyl Alcohol with Glycols and Their Deviations Sahar M. Tawfik and Farid M. Farag Refining division, Egyptian Petroleum Research Institute Nasr City, Cairo, 11727 Egypt E-mail: sahartawfikepri@yahoo.com

“…Benzyl alcohol and glycols are a very interesting class of the solvents, due to the simultaneous presence of the hydroxyl groups SAHAR M. TAWFIK AND FARID M. FARAG in the same molecule, which allows their selfassociation via intra-and/or intermolecular hydrogen bonds [8][9]. The excess properties of binary liquid mixtures containing BA have been studied previously [10,11]. We use a variety of glycols which represents different types and degrees of association between unlike molecules to study more systematically the benzyl alcohol with glycols interaction.…”