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231223s2004 xx ||||| 00| ||eng c |
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|a pubmed24n0505.xml
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|a (DE-627)NLM151345759
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|a (NLM)15461475
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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|a Siriwatwechakul, Wanwipa
|e verfasserin
|4 aut
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|a Effects of organic solvents on the scission energy of rodlike micelles
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|c 2004
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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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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 25.04.2006
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|a Date Revised 21.11.2013
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|a published: Print
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|a Citation Status MEDLINE
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|a Copyright 2004 American Chemical Society
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|a The linear viscoelastic response of erucyl bis(hydroxyethyl) methylammonium chloride with added KCl has been studied as a function of temperature and nonpolar solvent addition. The plateau modulus is independent of temperature from 25 to 40 degrees C, in contrast to previous studies with salicylate counterions that showed a plateau modulus increasing with temperature over this range. The average micelle length, L, predicted by the model of Cates, depends experimentally on Escis/kBT, where Escis is the scission energy of the chain and kBT is the Boltzmann constant times the absolute temperature. With ethanol addition, the calculated average contour length, L, decreases by a factor of 4 as ethanol concentration varies from 0 to 1.3 M. This corresponds to an apparent energy for scission, Escis, decrease from 81 +/- 8 to 74 +/- 7 kJ/mol. On the other hand, only 80 mM of hexane is required to cause a decrease in Escis to the same level, and for hexane addition levels above 70 mM a disruption in the plateau modulus indicates the disruption of the rodlike structure. The correspondence between the effect of temperature and the effect of solvent addition allows the development of "solvent/temperature" superposition rules to predict the rheology of these viscoelastic fluids at elevated temperatures
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Erucic Acids
|2 NLM
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|a Hexanes
|2 NLM
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|a Micelles
|2 NLM
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|a Quaternary Ammonium Compounds
|2 NLM
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|a erucyl bis(hydroxyethyl) methylammonium chloride
|2 NLM
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|a Ethanol
|2 NLM
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|a 3K9958V90M
|2 NLM
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|a Lafleur, Terry
|e verfasserin
|4 aut
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|a Prud'homme, Robert K
|e verfasserin
|4 aut
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| 700 |
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|a Sullivan, Phillip
|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 20(2004), 21 vom: 12. Okt., Seite 8970-4
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:20
|g year:2004
|g number:21
|g day:12
|g month:10
|g pages:8970-4
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|a AR
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|d 20
|j 2004
|e 21
|b 12
|c 10
|h 8970-4
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