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The impact of the hydrophobicity of oppositely charged additives on the stability of C(14)TAB foam films has been studied using a thin film pressure balance (TFPB). Disjoining pressure isotherms of 10(-4)M C(14)TAB solutions containing negatively charged sodium alkanoates CnOONa with increasing chain length from n = 4 to n = 12 are measured. The results of disjoining pressure measurements are presented as maximum possible pressure Pi(max) applied to a stable film as a function of the alkanoate concentration. Furthermore, the surface properties of the mixed systems are described to gain a general understanding about the surface characteristics. Since C14TAB and alkanoates are oppositely charged, the question arises whether charge reversal at the film surfaces occurs and how it depends on the chain length of the alkanoate. The presented results indicate that C(14)TAB/alkanoate systems can be divided into three groups. Depending on the chain length, alkanoates act as organic salts (n = 4), co-surfactant (n = 6) or anionic surfactant(8 <= n <= 12). In case of alkanoates acting as anionic surfactant, the simulation of the isotherms by solving the non-linearized Poisson-Boltzmann equation under assumption of constant potential actually indicates that charge reversal occurs close to the nominal IEP. The film stabilities are markedly affected by the hydrophobicity and the amount of alkanoate. (C) 2014 Elsevier B.V. All rights reserved.

@article{ ISI:000341880200022, Author = {Schelero, Natascha and Miller, Reinhard and von Klitzing, Regine}, Title = {{Effect of oppositely charged hydrophobic additives (alkanoates) on the stability of C(14)TAB foam films}}, Journal = {{COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS}}, Year = {{2014}}, Volume = {{460}}, Pages = {{158-167}}, Month = {{OCT 20}}, Note = {{Colloids and Surfaces a Physicochemical and Engineering Aspects Conference, European Cooperat Sci \& Technol, Sofia, BULGARIA, SEP 01-06, 2013}}, Organization = {{BAS, Inst Phys Chem, Dept Interfaces \& Colloids; SU, Fac Chem \& Pharm, Dept Phys Chem}}, Abstract = {{The impact of the hydrophobicity of oppositely charged additives on the stability of C(14)TAB foam films has been studied using a thin film pressure balance (TFPB). Disjoining pressure isotherms of 10(-4)M C(14)TAB solutions containing negatively charged sodium alkanoates CnOONa with increasing chain length from n = 4 to n = 12 are measured. The results of disjoining pressure measurements are presented as maximum possible pressure Pi(max) applied to a stable film as a function of the alkanoate concentration. Furthermore, the surface properties of the mixed systems are described to gain a general understanding about the surface characteristics. Since C14TAB and alkanoates are oppositely charged, the question arises whether charge reversal at the film surfaces occurs and how it depends on the chain length of the alkanoate. The presented results indicate that C(14)TAB/alkanoate systems can be divided into three groups. Depending on the chain length, alkanoates act as organic salts (n = 4), co-surfactant (n = 6) or anionic surfactant(8 <= n <= 12). In case of alkanoates acting as anionic surfactant, the simulation of the isotherms by solving the non-linearized Poisson-Boltzmann equation under assumption of constant potential actually indicates that charge reversal occurs close to the nominal IEP. The film stabilities are markedly affected by the hydrophobicity and the amount of alkanoate. (C) 2014 Elsevier B.V. All rights reserved.}}, DOI = {{10.1016/j.colsurfa.2014.03.091}}, ISSN = {{0927-7757}}, EISSN = {{1873-4359}}, ORCID-Numbers = {{Miller, Reinhard/0000-0001-8943-7521}}, Unique-ID = {{ISI:000341880200022}}, }

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