Linked Life Data

5075503

Source:http://linkedlifedata.com/resource/pubmed/id/5075503

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1972-11-29
pubmed:abstractText
Force-area isotherms of stearic acid and stearic acid-stearyl alcohol mixtures were investigated on alkaline subphases that contained Tris, Na(+), or K(+) cations and that varied in pH and ionic strength. The monolayer behaved as though ionization was effectively complete in the expanded region of the force-area isotherm. Surface pressure in this region was independent of pH and varied inversely with ionic strength as predicted by the Davies equation. The monolayer behaved as a partially ionized film in the plateau region of the force-area isotherm. Surface pressure in this region varied directly with pH and ionic strength as predicted by a modified Davies equation for partially ionized monolayers. The neutral molecule, stearyl alcohol, exerted a large condensing effect on the ionized film at pH 12.8, and this condensing effect also supported the concept that a partially ionized stearic acid film existed in the plateau region of the force-area isotherm. A greater binding affinity for Na(+) than for K(+) showed that the stearate anion surface behaved as a strong field at pH 10 and above, and a greater binding affinity for K(+) than for Na(+) showed that the stearate anion surface behaved as a weak field at pH 9. The weak field explained in part the anomalous binding affinity of the large Tris cation for the stearate monolayer at pH 9.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0022-2275
pubmed:author
pubmed:issnType
Print
pubmed:volume
13
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
574-9
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
1972
pubmed:articleTitle
Effect of ionization and cation selectivity on the expansion of stearic acid monolayers.
pubmed:publicationType
Journal Article