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231223s2007 xx ||||| 00| ||eng c |
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|a pubmed24n0567.xml
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|a (DE-627)NLM169995933
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|a (NLM)17469857
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|a DE-627
|b ger
|c DE-627
|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Deo, Puspendu
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Interactions of a hydrophobically modified polymer with oppositely charged surfactants
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| 264 |
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1 |
|c 2007
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| 336 |
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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| 338 |
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|a Band
|b nc
|2 rdacarrier
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| 500 |
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|a Date Completed 11.07.2007
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|a Date Revised 15.05.2007
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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| 520 |
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|a The interaction of a hydrophobically modified anionic polymer (PMAOVE) with a cationic surfactant (DTAB) was studied using a multi-technique approach: turbidity, surface tension, and viscosity measurements, as well as EPR (5-doxyl stearic acid) and fluorescence (pyrene) probe techniques were used. In the investigated pH range (4-10), the cationic surfactant headgroups interact with the anionic carboxylic groups of the polymer backbone. In addition, nonpolar interactions of the surfactant chains with the n-octyl chains of PMAOVE stabilize the PMAOVE-DTAB complexes. Charge neutralization of the anionic polymer by the cationic surfactant leads to precipitation of the PMAOVE-DTAB complex at a certain DTAB concentration range. Further addition of DTAB causes a charge reversal of the complex and, subsequently, resolubilization of the precipitate. At an acidic pH (pH = 4), a second precipitation was observed, which is probably caused by conformational changes in the PMAOVE-DTAB complex. This second precipitate can be resolubilized by further addition of surfactant. At a neutral and basic pH, this second precipitation is absent. EPR analysis indicates that the surfactants form an ordered structure at the extended polymer chain at a neutral and basic pH, whereas at an acidic pH, a less ordered surfactant layer is formed on the coiled polymer with more hydrophobic microdomains
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|a Journal Article
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1 |
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|a Deo, Namita
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Somasundaran, P
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Moscatelli, Alberto
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Jockusch, Steffen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Turro, Nicholas J
|e verfasserin
|4 aut
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| 700 |
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|a Ananthapadmanabhan, K P
|e verfasserin
|4 aut
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| 700 |
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|a Ottaviani, M Francesca
|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 23(2007), 11 vom: 22. Mai, Seite 5906-13
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
1 |
8 |
|g volume:23
|g year:2007
|g number:11
|g day:22
|g month:05
|g pages:5906-13
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|d 23
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