Hofmann, Matthias J. and Motschmann, Hubert (2017) Surface rheology and its relation to foam stability in solutions of sodium decyl sulfate. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 532. pp. 472-475. ISSN 0927-7757, 1873-4359
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The anionic surfactant sodium decyl sulfate (SDeS) at concentrations below its critical micellar concentration (cmc) was studied in a surface chemically purified state at the air-water interface in terms of its static and dynamic interfacial properties. Equilibrium surface tension was determined using a pendant drop tensiometer. An oscillating bubble capillary pressure tensiometer allowed accessing the surface dilatational properties of the surfactant's adsorption layers in a frequency range from 2 to 500 Hz. The estimation of single foam lamella stability was obtained from visual observation of films formed within a rectangular glass frame in a saturated atmosphere. Upon increasing surfactant concentration, the foam lamellae were found to rupture at prolonged lifetimes. The dramatic difference in foam stability goes along with a pronounced transition from a surface elastic to a surface visco-elastic state of the adsorption layers. These findings were indicative for a correlation between foam lamella stability and surface viscoelasticity also for this model surfactant. These results may be of importance to further shed light on the processes governing foam and foam lamella stability.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | AIR-WATER-INTERFACE; ALKYL SULFATES; CHAIN-LENGTH; IDEAL BEHAVIOR; ADSORPTION; THERMODYNAMICS; MECHANISM; TENSION; Sodium decyl sulfate (SDeS); Oscillating bubble capillary pressure tensiometry; Foam lamella stability; Dilatational rheology |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry VI - Physical Chemistry (Solution Chemistry) > Prof. Dr. Hubert Motschmann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:19 |
| Last Modified: | 13 Dec 2019 14:07 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1866 |
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