Thermodynamic characterization of the interaction behavior of a hydrophobically modified polelectrolyte and oppositely charged surfactants in aqueous solution: Effect of surfactant alkyl chain length

Article Abstract:

The study used a precision isothermal titration microcalorimeter (ITC) to measure the enthalpy curves for the interaction of a hydrophobically modified polyelectroclyte (D40OCT30) with oppositely charged surfactants (SCnS) in aqueous solution. D40OCT30 is a newly synthesized polymer based on dextran having pendant N-(2-hydroxypropyl-N,N-dimethyl-N-octylammonium chloride groups randomly distributed along the polymer backbone with degree of substitution of 28.1%.

Analysis, Volumetric analysis

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A thermodynamic interpretation of the 'excluded-volume effect' in coupled diffusion

Article Abstract:

Thermodynamics is employed to understand the coupled diffusion of solution components caused by differences in the molecular size. The thermodynamic model of coupled diffusion, though limited in scope to ideal or nearly-ideal nonelectrolyte solutions, can be used to more complicated systems by including terms for hydration, association, activity coefficients, ionic migration in diffusion-induced electric fields and polydisperity.

Chemical compounds

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Thermodynamic of macroscopic and microscopic proton ionization from protonated 4-aminobenzoic acid in aqueous solution from 298.15 to 393.15 K

Article Abstract:

Macroscopic and microscopic thermodynamic quantities for proton ionization from protonated 4-aminobenzoic acid in aqueous solutions are determined by a combination of NMR, potentiometric, and calorimetric methods. Mathematical relationships are found between the thermodynamic quantities associated with the macroscopic and microscopic reactions.

Usage, Observations, Nuclear magnetic resonance, Aminobenzoic acid

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