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231223s2010 xx |||||o 00| ||eng c |
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|a 10.1021/la101870m
|2 doi
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|a pubmed24n0667.xml
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|a eng
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1 |
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|a Alvarez, Nicolas J
|e verfasserin
|4 aut
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|a A microtensiometer to probe the effect of radius of curvature on surfactant transport to a spherical interface
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|c 2010
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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| 500 |
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|a Date Completed 22.11.2010
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|a Date Revised 10.08.2010
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Diffusion of surfactant to a spherical interface depends on the radius of curvature of the interface; the smaller the radius of curvature is, the faster the dynamics. This paper presents and validates an experimental apparatus, denoted a "microtensiometer", to study the dependence of surfactant dynamics on radius of curvature. Dynamic surface tension is monitored for a range of bubble radii from 17 to 150 microm, and the dynamics are compared with those obtained using the classic pendant drop experiment for a nonionic surfactant at the air-water interface. Experiments reveal that dynamic surface tension follows a diffusion-limited scaling, in which radius of curvature is a key parameter. Despite the clear scaling behavior of the experimental equilibration time, the full dynamic curve for an initially clean interface cannot be predicted by a diffusion-limited transport model using the molecular diffusion coefficient and a single isotherm. However, the same model is shown to correctly predict compression-expansion experiments. Aside from elucidation of surfactant transport, this device provides a tool for rapid measurements of interfacial properties using a significantly lower volume of sample than current methods
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|a Journal Article
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|a Walker, Lynn M
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Anna, Shelley L
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 26(2010), 16 vom: 17. Aug., Seite 13310-9
|w (DE-627)NLM098181009
|x 1520-5827
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|g volume:26
|g year:2010
|g number:16
|g day:17
|g month:08
|g pages:13310-9
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|u http://dx.doi.org/10.1021/la101870m
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