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231223s2008 xx |||||o 00| ||eng c |
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|a 10.1021/la801683q
|2 doi
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|a pubmed25n0607.xml
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|a DE-627
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|a eng
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|a Saad, Sameh M I
|e verfasserin
|4 aut
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|a Axisymmetric drop shape analysis-constrained sessile drop (ADSA-CSD)
|b a film balance technique for high collapse pressures
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|c 2008
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 28.10.2008
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|a Date Revised 03.10.2008
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Collapse pressure of insoluble monolayers is a property determined from surface pressure/area isotherms. Such isotherms are commonly measured by a Langmuir film balance or a drop shape technique using a pendant drop constellation (ADSA-PD). Here, a different embodiment of a drop shape analysis, called axisymmetric drop shape analysis-constrained sessile drop (ADSA-CSD) is used as a film balance. It is shown that ADSA-CSD has certain advantages over conventional methods. The ability to measure very low surface tension values (e.g., <2 mJ/m2), an easier deposition procedure than in a pendant drop setup, and leak-proof design make the constrained sessile drop constellation a better choice than the pendant drop constellation in many situations. Results of compression isotherms are obtained on three different monolayers: octadecanol, dipalmitoyl-phosphatidyl-choline (DPPC), and dipalmitoyl-phosphatidyl-glycerol (DPPG). The collapse pressures are found to be reproducible and in agreement with previous methods. For example, the collapse pressure of DPPC is found to be 70.2 mJ/m2. Such values are not achievable with a pendant drop. The collapse pressure of octadecanol is found to be 61.3 mJ/m2, while that of DPPG is 59.0 mJ/m2. The physical reasons for these differences are discussed. The results also show a distinctive difference between the onset of collapse and the ultimate collapse pressure (ultimate strength) of these films. ADSA-CSD allows detailed study of this collapse region
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Solutions
|2 NLM
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|a Policova, Zdenka
|e verfasserin
|4 aut
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|a Acosta, Edgar J
|e verfasserin
|4 aut
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|a Neumann, A Wilhelm
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1991
|g 24(2008), 19 vom: 07. Okt., Seite 10843-50
|w (DE-627)NLM098181009
|x 0743-7463
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|g volume:24
|g year:2008
|g number:19
|g day:07
|g month:10
|g pages:10843-50
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|u http://dx.doi.org/10.1021/la801683q
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