Document Detail

Dynamic surface tension of surfactant TA: experiments and theory.
MedLine Citation:
PMID:  7896607     Owner:  NLM     Status:  MEDLINE    
A bubble surfactometer was used to measure the surface tension of an aqueous suspension of surfactant TA as a function of bubble area over a range of cycling rates and surfactant bulk concentrations. Results of the surface tension-interfacial area loops exhibited a rich variety of phenomena, the character of which varied systematically with frequency and bulk concentration. A model was developed to interpret and explain these data and for use in describing the dynamics of surface layers under more general circumstances. Surfactant was modeled as a single component with surface tension taken to depend on only the interfacial surfactant concentration. Two distinct mechanisms were considered for the exchange of surfactant between the bulk phase and interface. The first is described by a simple kinetic relationship for adsorption and desorption that pertains only when the interfacial concentration is below its maximum equilibrium value. The second mechanism is "squeeze-out" by which surfactant molecules are expelled from an interface compressed past a maximum packing state. The model provided good agreement with experimental measurements for cycling rates from 1 to 100 cycles/min and for bulk concentrations between 0.0073 and 7.3 mg/ml.
D R Otis; E P Ingenito; R D Kamm; M Johnson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of applied physiology (Bethesda, Md. : 1985)     Volume:  77     ISSN:  8750-7587     ISO Abbreviation:  J. Appl. Physiol.     Publication Date:  1994 Dec 
Date Detail:
Created Date:  1995-04-21     Completed Date:  1995-04-21     Revised Date:  2013-09-26    
Medline Journal Info:
Nlm Unique ID:  8502536     Medline TA:  J Appl Physiol (1985)     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  2681-8     Citation Subset:  IM    
Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge 02139.
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MeSH Terms
Biological Agents*
Chemistry, Physical
Models, Chemical*
Physicochemical Phenomena
Pulmonary Surfactants / chemistry*
Surface Tension
Grant Support
Reg. No./Substance:
0/Biological Agents; 0/Pulmonary Surfactants; 108778-82-1/beractant

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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