Application of the Extended Langmuir Model for the Determination of Lyophobicity of 1-Propanol in Acetonitrile

Abstract

Surface tensions (σ ) of binary liquid mixtures of acetonitrile (ACN) with 1-propanol (PrOH) were measured over the entire composition range at eight different temperatures, 278.15 K, 283.15 K, 288.15 K, 293.15 K, 298.15 K, 303.15 K, 308.15 K, and 313.15 K. The lyophobicities (β) of the surfactant PrOH relative to that of ACN as well as the surface mole fractions (x S 2 ) of PrOH at various temperatures were derived using the extended Langmuir model (Langmuir 17, 4261, 2001). The β values indicate the greater affinity of PrOH for the surface, and this trend slightly increases with rising temperature. The determined x S 2 values indicate that the surface concentration of PrOH is always higher than its bulk concentration and consequently confirm that the surface is enriched with PrOH.

Surface and Calorimetric Behavior of N,N-Dimethylacetamide with n-Alkanols or 2-Alkanols

“…The experimental values for the surface tension of pure components at working temperatures and atmospheric pressure are collected in Table 2. The surface tension values for the pure 24 22.19 43 20.88 20.9 25 20.89 43 ethanol 23.07 23.17 23 23.1 26 21.87 21.86 23 21.9 27 20.61 20.6 27 20.62 28 1-propanol 24.55 24.57 23 24.5 29 23.39 23.34 23 23.31 31 22.25 22.18 23 22.11 30 1-butanol 25.48 25.4 22 25.36 23 24.22 24.20 33 24.18 34 23.12 23.0 22 compounds found in the literature 21−45 are also included in this table. In general, the accordance between the experimental and literature data is good, particularly for the case of alcohols.…”

“…The experimental values for the surface tension of pure components at working temperatures and atmospheric pressure are collected in Table . The surface tension values for the pure compounds found in the literature − are also included in this table. In general, the accordance between the experimental and literature data is good, particularly for the case of alcohols.…”

Surface Tensions of Alkyl Lactates with n-Alkanols or Branched Alkanols

“…In Table , the experimental surface tensions of the pure compounds at T = 298.15 K and at p = 0.1 MPa are given. For comparison, surface tensions obtained from the literature ,− have been also included in this table. The agreement between both data sets is excellent.…”