Viscosity and Density of Binary Mixtures of Ethanol + Igepal (CO-520, CO-630, CO-720, and CA-720)

Abstract

Surfactants are widely used for academic and industrial purposes. For this reason, thermodynamic and physical properties of surfactant and cosurfactant mixtures can provide important information about the nature of the molecular interactions present. In this work, volumetric and transport data of surfactant binary mixtures of the ethanol + Igepal series (Igepal CO-520, Igepal CO-630, Igepal CO-720, and Igepal CA-720) were determined experimentally within a range of temperature of T = 293.15− 323.15 K, at atmospheric pressure. From these data, the following derivative properties have been calculated: the excess molar volume, viscosity deviation, and coefficient of thermal expansion. All of these mixtures showed that attractive intermolecular forces are dominant.

Viscosity and Density of Binary Mixtures of Toluene + Igepal (CO-520, CO-630, CO-720, and CA-720) at T = 293.15–333.15 K and Atmospheric Pressure

“…Pollig, Prausnitz, and O’Connell state that the average kinetic energy increases by decreasing viscosity, that is, when IMF becomes weaker. A similar viscosity deviation behavior was reported in our previous paper . Toluene + Igepal systems behave as a typical liquid, especially for Tr below 0.7, that is, viscosity decreases by increasing temperature.…”

“…Notwithstanding the similar ethoxylate chain for Igepal CO-720 and Igepal CA-720, the latter behaves differently from the former, which could be attributed to the difference of the alkylic chain. From our previous paper, 13 the steric hindrance and hence is affected by the alkyl side chain changing (from branched to a linear one), for example, Igepal CA-720 to Igepal CO-720, reducing the excess molar volume. 24 Table 7 and Figure 3 show viscosity deviation for toluene + Igepal series (Igepal CO-520, Igepal CO-630, Igepal CO-720, or Igepal CA-720) at a temperature range of T = 293.15−333.15 K and at an atmospheric pressure of 101.3 kPa.…”

“…Notwithstanding the similar ethoxylate chain for Igepal CO-720 and Igepal CA-720, the latter behaves differently from the former, which could be attributed to the difference of the alkylic chain. From our previous paper, the steric hindrance and hence is affected by the alkyl side chain changing (from branched to a linear one), for example, Igepal CA-720 to Igepal CO-720, reducing the excess molar volume …”

“…Standard uncertainties are established as u : u ( x 1 ) = 0.003, u ( T ) = 0.01 K, u (η) = 0.02•η mPa•s, and u (ρ) = 0.0015 g•cm –3 . Binary mixture preparation has been described elsewhere . From these data, the following thermodynamic derivative properties have been calculated: excess molar volume ( V E ), viscosity deviation (Δη), thermal expansion coefficient (α), excess thermal expansion coefficients (α E ), and partial molar volumes ( V̅ i ).…”

“…Binary mixture preparation has been described elsewhere. 13 From these data, the following thermodynamic derivative properties have been calculated: excess molar volume (V E ), viscosity deviation (Δη), thermal expansion coefficient (α), excess thermal expansion coefficients (α E ), and partial molar volumes (V̅ i ). Excess properties (or deviation properties) have been used to evaluate ideal solution deviations.…”