Abstract:

We characterized the sequential adsorption behavior of Aerosol-OT (AOT) on squalane/aqueous interfaces that were precoated with Tween 80. This dataset reports dynamic interfacial tension for Tween 80 solutions and at the squalane/aqueous interface during the sequential adsorption of surfactant from solution. Surface pressure as a function of surface area is reported for Tween 80 coated interfaces and for surfaces precoated with Tween 80 at several AOT concentrations. Surface pressure measurements are also provided for several AOT concentrations in a 0.5 M NaCl solution on squalene interfaces precoated with Tween 80. Dynamic interfacial tension of oil/water systems was measured using a microtensiometer.

Suggested Citation:

Kirby, Stephanie. 2016. Dataset for: Sequential adsorption of an irreversibly adsorbed nonionic surfactant and an anionic surfactant at an oil/aqueous interface. Distributed by: GRIIDC, Harte Research Institute, Texas A&M University–Corpus Christi. doi:10.7266/N7HH6H2M

Publications:

Kirby, S. M., Anna, S. L., & Walker, L. M. (2015). Sequential Adsorption of an Irreversibly Adsorbed Nonionic Surfactant and an Anionic Surfactant at an Oil/Aqueous Interface. Langmuir, 31(14), 4063–4071. doi:10.1021/la504969v

Purpose:

Characterize the interfacial behavior of a model dispersant system for improved understanding and future dispersant design.

Data Parameters and Units:

rawdata_compiled.xlsx: Figure 1: Capillary radius (um); Cell temperature (degrees C); Outer phase; Inner phase; Rinse phase; Pump setting; Hydrostatic pressure of solution at capillary (Pa); RMS fit error; Time (sec); interfacial tension (γ, mN/m); Pressure (Pa), Radius (um). Figure 2: Outer phase Tween 80 concentration (uM); Surface pressure before DI rinse (mN/m); Surface pressure after DI rinse (mN/m); Hydrostatic pressure (Pa); Inner phase; Capillary radius (um); Temperature (degrees C); Rinse phase; Pump setting. Figure 3: Capillary radius (um); Initial outer phase; Inner phase; Rinse phase; Surface pressure after rinse (mN/m); Hydrostatic pressure (Pa); horizontal shift factor (χ, /molecules); Surface area (um^2); Surf. Press. (mN/m); Area error. Figure 4: Capillary radius (um); Cell temperature (degrees C); Outer phase; Inner phase; Rinse phase; Pump setting; Hydrostatic pressure(Pa); time (sec); interfacial tension (γ, mN/m); Pressure (Pa); Radius (um); RMS fit error. Figure 5: Tween 80 surface tension after DI rinse (γ, mN/m); AOT concentration (mM); Surface pressure after AOT exposure (mN/m); Capillary radius (um); Cell temperature (degrees C); Inner phase; Rinse phase; Pump setting; Hydrostatic pressure (Pa); a (mM); a error (mM); maximum AOT coverage (Γ∞, µmol/m^2); Γ∞ Error (µmol/m^2). Figure 6: Tween 80 surface tension after DI rinse (γ, mN/m); AOT concentration in 0.5 M NaCl solution (mM); Surface pressure after AOT exposure (mN/m); Capillary radius (um); Cell temperature (degrees C); Inner phase; Rinse phase; Pump setting; Hydrostatic pressure (Pa); a (mM); a error (mM); maximum AOT coverage (Γ∞, µmol/m^2); Γ∞ Error (µmol/m^2). Figure 7: Tween 80 surface tension after DI rinse (γ, mN/m); maximum Tween coverage (Tween 80 Γ, µmol/m^2); maximum AOT coverage(AOT Γ∞, µmol/m^2); Γ∞ Error (µmol/m^2); Capillary radius (um); Cell temperature (degrees C); Inner phase; Outer phase; Hydrostatic pressure (Pa). Figure 8: Tween 80 surface tension after 1st DI rinse (γ, mN/m); AOT concentration (mM); Surface pressure after 2nd DI rinse (mN/m); Capillary radius (um); Cell temperature (degrees C); Inner phase; Rinse phase; Pump setting; Hydrostatic pressure (Pa). Figure S1: Tween 80 surface tension after DI rinse (γ, mN/m); Tween 80 Γ (µmol/m^2). Figure S2: Capillary radius (um); Cell temperature (degrees C); Outer phase; Inner phase; Rinse phase; Pump setting; Hydrostatic pressure(Pa); RMS fit error; Time (sec); interfacial tension (γ, mN/m); Pressure (Pa); Radius (um); RMS fit error. Figure S3: Tween 80 surface tension after DI rinse (γ, mN/m); AOT concentration (mM); Surface pressure after AOT exposure (mN/m); Capillary radius (um); Cell temperature (degrees C); Inner phase; Rinse phase; Pump setting; Hydrostatic pressure (Pa); AOT adsorption type.

Methods:

Interfacial behavior characterized using interfacial tension measurements, performed on a microtensiometer.

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