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231225s2018 xx |||||o 00| ||eng c |
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|a 10.1021/acs.langmuir.7b03614
|2 doi
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|a pubmed24n0929.xml
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|a (DE-627)NLM278936210
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|a (NLM)29228778
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|a DE-627
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|e rakwb
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|a eng
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| 100 |
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|a Ji, Xiuling
|e verfasserin
|4 aut
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|a Effects of Calcium Ions on the Solubility and Rheological Behavior of a C22-Tailed Hydroxyl Sulfobetaine Surfactant in Aqueous Solution
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|c 2018
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|a Text
|b txt
|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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|a Date Completed 11.04.2018
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|a Date Revised 11.04.2018
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Effects of calcium ions (Ca2+) on the solubility, aggregate structure, and rheological behavior of a C22-tailed zwitterionic surfactant, erucyl dimethyl amidopropyl hydroxyl sulfobetaine (EHSB), have been investigated in aqueous solution. In comparison with sodium ions (Na+), Ca2+ ions exhibit a much higher efficiency in decreasing the Krafft temperature (TK) of EHSB. Specifically, contrary to Na+ ions which have no obvious effect on the rheological properties of the EHSB solution, Ca2+ ions increase the viscosity of the EHSB solution at lower EHSB concentration, and enhance its elasticity at higher EHSB concentration. Moreover, Ca2+ ions raise the temperature needed for the elastic-to-viscous transition of the EHSB solution at higher concentration. At lower EHSB concentration, the hydrophobic interaction between the ultralong hydrocarbon chains induces a tighter packing of the hydrophobic chains by forming a more stretched configuration, while at higher EHSB concentration, the electrostatic attraction between Ca2+ ions and the sulfonate groups of EHSB induces a tighter packing of the headgroups by forming Ca2+-mediated bridges among the EHSB headgroups. Besides, the above interactions may strengthen the hydrogen bonding of OH groups and/or of C═O amide groups, which in turn facilitates the compact packing of the surfactant molecules in aggregates and promotes the growth and entanglement of wormlike micelles. Thus, the EHSB solution shows Ca2+-dependent rheological behaviors. The solubility and rheological properties of the ultralong chain surfactant solution can be simultaneously improved with the addition of divalent Ca2+ ions
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Tian, Maozhang
|e verfasserin
|4 aut
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|a Ma, Desheng
|e verfasserin
|4 aut
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| 700 |
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|a Zhu, Youyi
|e verfasserin
|4 aut
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|a Zhou, Zhao-Hui
|e verfasserin
|4 aut
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|a Zhang, Qun
|e verfasserin
|4 aut
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| 700 |
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|a Wang, Yilin
|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 34(2018), 1 vom: 09. Jan., Seite 291-301
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:34
|g year:2018
|g number:1
|g day:09
|g month:01
|g pages:291-301
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|u http://dx.doi.org/10.1021/acs.langmuir.7b03614
|3 Volltext
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