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An investigation of dynamic surface tension, critical micelle concentration, and aggregation number of three nonionic surfactants using NMR, time-resolved fluorescence quenching, and maximum bubble pressure tensiometry
YKI – Ytkemiska institutet. KTH Royal Institute of Technology, Sweden.
Lund Universitet.
Uppsala Universitet.
2003 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 262, 506-515 p.Article in journal (Refereed)
Abstract [en]

Several physico-chemical properties have been determined for, N-dodecyllactobionamide (LABA), maltose 6'-O-dodecanoate (C12-maltose ester), and tetra(ethylene oxide) dodecyl amide (TEDAd). Attractive headgroup interactions due to the increase in the flexibility of the sugar headgroup reduces the area/molecule at the liquid-vapor interface both below and above the critical micelle concentration (cmc). The obtained cmc:s were 0.35 mM (LABA), 0.3 mM (C12-maltose ester) and 0.5 mM (TEDAd). The monomer diffusion coefficient decreased with the molecular weight, and increasing headgroup flexibility of the sugar headgroup, and values were in the range from 3.1¥10-10-3.6¥10-10 m2/s. The micelle diffusion coefficients (0.46¥10-10-0.68¥10-10 m2/s) indicated that the TEDAd micelles deviated most from spherical shape. The micelle aggregation numbers determined by TRFQ were estimated to be 120±10 (LABA), 90±10 (C12-maltose ester) and 130±10 (TEDAd). The dynamic surface tension measurements show that the adsorption of TEDAd to the liquid-vapor interface at short surface life-times is diffusion limited, whereas an adsorption barrier is present for the sugar surfactants. The analysis of the dynamic surface tension data above the cmc shows that the rate of demicellization is faster for TEDAd than for the two sugar-based surfactants.

Place, publisher, year, edition, pages
2003. Vol. 262, 506-515 p.
Keyword [en]
Nonionic surfactant, sugar surfactant, amide ethoxylate, dynamic surface tension, maximum bubble pressure, NMR self-diffusion, TRFQ
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26683OAI: oai:DiVA.org:ri-26683DiVA: diva2:1053686
Note
A1530Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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  • apa
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