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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la400615j
|2 doi
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|a pubmed24n0755.xml
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|a DE-627
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|e rakwb
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|a eng
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|a Kumar, Naveen
|e verfasserin
|4 aut
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|a Salt dependent stability of stearic acid Langmuir-Blodgett films exposed to aqueous electrolytes
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|c 2013
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|a Text
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|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 11.11.2013
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a We use contact angle goniometry, imaging ellipsometry, and atomic force microscopy to study the stability and wettability of Langmuir-Blodgett (LB) monolayers of stearic acid on silica substrates, upon drying and exposure to aqueous solutions of varying salinity. The influences of Ca(2+) and Na(+) ions are compared by varying their concentrations, both in the subphase before the LB transfer, and in the droplets to which the dried LB layers are exposed. Ca(2+) ions in the subphase are found to enhance the stability, leading to contact angles up to 100°, as compared to less than 5° for Na(+). Consistent with the macroscopic wettability, AFM images show almost intact films with few holes exposing bare substrate when prepared in the presence of Ca(2+), while subphases containing Na(+) result in large areas of bare substrate after exposure to aqueous drops. The observations on varying the composition of the droplets corroborate the stabilizing effect of Ca(2+). We attribute these findings to the cation-bridging ability of Ca(2+) ions, which can bind the negatively charged stearate groups to the negatively charged substrates. We discuss the relevance of our findings in the context of enhanced oil recovery
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Electrolytes
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|a Salts
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|a Stearic Acids
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|a Water
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|a 059QF0KO0R
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|a stearic acid
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|a Silicon Dioxide
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|a 7631-86-9
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|a Sodium
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|a 9NEZ333N27
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|a Calcium
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|a SY7Q814VUP
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|a Wang, Lei
|e verfasserin
|4 aut
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|a Siretanu, Igor
|e verfasserin
|4 aut
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|a Duits, Michel
|e verfasserin
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|a Mugele, Frieder
|e verfasserin
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 29(2013), 17 vom: 30. Apr., Seite 5150-9
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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|g volume:29
|g year:2013
|g number:17
|g day:30
|g month:04
|g pages:5150-9
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|u http://dx.doi.org/10.1021/la400615j
|3 Volltext
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