Correlation between film properties and the purity of surfactants

Schlarmann, Judith; Stubenrauch, Cosima; Strey, R.

doi:10.1039/b208899c

Cited by 49 publications

(37 citation statements)

References 35 publications

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“…However, systematic studies are rare. We know of four studies only where the properties of foam films stabilized with unpurified ("as received") and purified surfactants, respectively, were investigated more or less systematically [6,[22][23][24] and of one systematic study on properties of foams stabilized with unpurified and purified surfactants [8]. The latter study also contains surface tension isotherms of the unpurified and the purified (threefold recrystallized) surfactants according to which a minimum is only observed for the unpurified surfactant.…”

Section: Influence Of Surfactant Puritymentioning

confidence: 97%

Properties of aqueous foams stabilized by dodecyltrimethylammonium bromide

Carey

Stubenrauch

2009

Journal of Colloid and Interface Science

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Section: Influence Of Surfactant Puritymentioning

confidence: 97%

Properties of aqueous foams stabilized by dodecyltrimethylammonium bromide

Carey

Stubenrauch

2009

Journal of Colloid and Interface Science

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“…[36] It is known that the frequency-dependent dilational (or compression) elasticity is the appropriate parameters to quantify or characterize the stability of monolayers. [17][18][19][20] As the monolayer is directly connected with the bulk phase, the dilational parameters depend strongly on adsorption and desorption processes. Compressing (expanding) the monolayer leads to desorption (adsorption) of the surfactant molecules into (from) the bulk to restore the equilibrium surface concentration.…”

Section: Resultsmentioning

confidence: 99%

“…[3] Therefore, the dynamic dilational properties on the adsorption layer of surfactant have been set store by many investigators in recent years. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] Amphiphilic block copolymers have attracted widespread interest for both scientific and practical reasons. [21] These macromolecules adsorb at various interfaces and play a significant role in dispersion stabilization, foaming, and emulsification.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Surface Dilational Properties of Block Copolymers and Sodium Oleate Using the Oscillating Bubble Method

Xin

et al. 2010

Journal of Dispersion Science and Technology

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The surface dilational modulus of the star-like block copolymer AP432 and linear block copolymer L64 was studied using the oscillating bubble method at an accessible frequency range of 0.05 to 2 Hz, which was compared with anionic surfactant sodium oleate (C 17 H 33 COONa) and the influence of inorganic salt NaNO 3 on the surface dilational modulus of AP432 and L64 was also studied. The results indicate that for AP432 and L64 the dilational modulus varies slightly, just decrease gradually with concentrations increasing and never reaches high values with the dilational frequency increasing, but the dilational modulus of C 17 H 33 COONa increases gradually with the increase of dilational frequency and pass through the maximum values with increasing concentration. The properties of AP432, L64, and C 17 H 33 COONa at the air/water interface were also observed by surface tension measurement. Based on these experimental results, a simple possible adsorption model of these molecules at air/water interface is proposed.

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“…For that purpose a system had to be found that can be compared to the foam film and whose phase diagram is known. Indeed, a thorough analysis of the results published so far reveals that the P-h curves of nonionic foam films measured at different surfactant concentrations [16][17][18][19][20][21][22][23][24] resemble p-V m isotherms of a real gas measured at different temperatures (p is the pressure and V m is the molar volume of the gas). When one replaces the film thickness h by the molar volume V m , the CBF by the gaseous phase, and the NBF by the liquid phase, the similarities between p-V m isotherms and P-h curves become obvious.…”

Section: Experimental P-h Curves Compared To P-v M Isothermsmentioning

confidence: 99%

What Do a Foam Film and a Real Gas Have In Common?

Stubenrauch

2005

ChemPhysChem

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The stability of well-drained quasistatic foam films (thickness <100 nm) is usually discussed in terms of surface forces, which create an excess pressure normal to the film interfaces, called the disjoining pressure pi The disjoining pressure is the sum of repulsive electrostatic (pi(elec)), attractive van der Waals (pi(vdW)), and repulsive steric (pi(sr)) forces on the assumption that structural forces can be neglected. On the basis of these forces two different types of thin foam films are distinguished, namely common black films (CBF), which are mainly stabilized by pi(elec), and Newton black films (NBF), the stability of which is determined by pi(sr),With a thin-film pressure balance (TFPB) the thickness h of a foam film can be measured as a function of the applied pressure from which the disjoining pressure pi can be calculated. A thorough analysis of the results published so far reveals that the pi-h curves of nonionic surfactants measured at different surfactant concentrations resemble p-V(m) isotherms of a real gas measured at different temperatures. On the basis of these observations the van der Waals description of a real gas can be applied to foam films and a phase diagram for a foam film was constructed using the Maxwell construction.

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Correlation between film properties and the purity of surfactants

Cited by 49 publications

References 35 publications

Properties of aqueous foams stabilized by dodecyltrimethylammonium bromide

Properties of aqueous foams stabilized by dodecyltrimethylammonium bromide

Comparison of the Surface Dilational Properties of Block Copolymers and Sodium Oleate Using the Oscillating Bubble Method

What Do a Foam Film and a Real Gas Have In Common?

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