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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la403582y
|2 doi
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|a pubmed24n0774.xml
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|a (DE-627)NLM232432376
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|a (NLM)24205784
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
1 |
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|a Wang, Meina
|e verfasserin
|4 aut
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| 245 |
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|a Coacervation of cationic gemini surfactant with N-benzoylglutamic acid in aqueous solution
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|c 2013
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 25.09.2014
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|a Date Revised 11.12.2018
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Coacervation of cationic gemini surfactant hexamethylene-1,6-bis(dodecyldimethylammonium bromide) (12-6-12) with pH-sensitive N-benzoylglutamic acid (H2Bzglu) has been investigated by potentiometric pH-titration, turbidity titration, dynamic light scattering (DLS), isothermal titration calorimetry (ITC), TEM, (1)H NMR, and light microscopy. Phase boundaries of the 12-6-12/H2Bzglu mixture were obtained over the pH range from 2 to 9 and in the H2Bzglu concentration range from 30.0 to 50.0 mM at pH 4.5. When the H2Bzglu concentration is beyond 30.0 mM, the 12-6-12/H2Bzglu mixed solution undergoes the phase transitions from soluble aggregate, to precipitate, coacervate, and soluble aggregate again as pH increases. The results indicate that coacervation occurs at extremely low 12-6-12 concentration and lasts over a wide surfactant range, and can be enhanced or suppressed by changing pH, 12-6-12/H2Bzglu molar ratio and H2Bzglu concentration. The coacervates present a disorderly connected lay structure. Coacervation only takes place at pH 4-5, where the aggregates are nearly charge neutralized, and a minimum H2Bzglu concentration of 30.0 mM is required for coacervation. In this pH range, H2Bzglu mainly exist as HBzglu(-). The investigations on intermolecular interactions indicate that the aggregation of 12-6-12 is greatly promoted by the strong electrostatic and hydrophobic interactions with the HBzglu(-) molecules, and the interaction also promotes the formation of dimers, trimers, and tetramers of HBzglu(-) through hydrogen bonds. The double chains of 12-6-12 and the HBzglu(-) oligomers can play the bridging roles connecting aggregates. These factors endow the mixed system with a very high efficiency in generating coacervation
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Alkenes
|2 NLM
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|a Cations
|2 NLM
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|a Glutamates
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|a Quaternary Ammonium Compounds
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|a Solutions
|2 NLM
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|a Surface-Active Agents
|2 NLM
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|a hexamethylene-1,6-bis(dodecyldimethylammonium bromide)
|2 NLM
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|a Water
|2 NLM
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|a 059QF0KO0R
|2 NLM
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|a N-benzoylglutamic acid
|2 NLM
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| 650 |
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|a 3591D74MXP
|2 NLM
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| 700 |
1 |
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|a Fan, Yaxun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Han, Yuchun
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Nie, Zongxiu
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Wang, Yilin
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 29(2013), 48 vom: 03. Dez., Seite 14839-47
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:29
|g year:2013
|g number:48
|g day:03
|g month:12
|g pages:14839-47
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|u http://dx.doi.org/10.1021/la403582y
|3 Volltext
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