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Salt-induced stability and modified interfacial energetics in self-faceting emulsion droplets.

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Title: Salt-induced stability and modified interfacial energetics in self-faceting emulsion droplets.
Authors: Nanikashvili, Pilkhaz M.1,2 (AUTHOR), Butenko, Alexander V.1,2 (AUTHOR), Deutsch, Moshe1,2 (AUTHOR), Lee, Daeyeon3 (AUTHOR), Sloutskin, Eli1,2 (AUTHOR) eli.sloutskin@biu.ac.il
Source: Journal of Colloid & Interface Science. Sep2022, Vol. 621, p131-138. 8p.
Subjects: Emulsions, Interfacial tension, Surface tension, Phase diagrams, Phase transitions, Microscopy, Smart materials
Abstract: [Display omitted] The counterintuitive temperature-controlled self-faceting of water-suspended, surfactant-stabilized, liquid oil droplets provides new opportunities in engineering of smart liquids, the properties of which are controllable by external stimuli. However, many emulsions exhibiting self-faceting phenomena have limited stability due to surfactant precipitation. The emulsions' stability may be enhanced, and their inter-droplet electrostatic repulsion tuned, through controlled charge screening driven by varying-concentration added salts. Moreover, in many technologically-relevant situations, salts may already exist in the emulsion's aqueous phase. Yet, salts' impact on self-faceting effects has never been explored. We hypothesize that the self-faceting transitions' temperatures, and stability against surfactant precipitation, of ionic-surfactants-stabilized emulsions are significantly modified by salt introduction. We explore the temperature-dependent impact of NaCl and CsCl salt concentration on the emulsions' phase diagrams, employing optical microscopy of emulsion droplet shapes and interfacial tension measurements, both sensitive to interfacial phase transitions. A salt concentration dependent increase in the self-faceting transition temperatures is found, and its mechanism elucidated. Our findings allow for a significant enhancement of the emulsions' stability, and provide the physical understanding necessary for future progress in research and applications of self-faceting phenomena in salt-containing emulsions. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Colloid & Interface Science is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 156843929
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Data: Salt-induced stability and modified interfacial energetics in self-faceting emulsion droplets.
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  Data: <searchLink fieldCode="AR" term="%22Nanikashvili%2C+Pilkhaz+M%2E%22">Nanikashvili, Pilkhaz M.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Butenko%2C+Alexander+V%2E%22">Butenko, Alexander V.</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Deutsch%2C+Moshe%22">Deutsch, Moshe</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lee%2C+Daeyeon%22">Lee, Daeyeon</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Sloutskin%2C+Eli%22">Sloutskin, Eli</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> eli.sloutskin@biu.ac.il</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Colloid+%26+Interface+Science%22">Journal of Colloid & Interface Science</searchLink>. Sep2022, Vol. 621, p131-138. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Emulsions%22">Emulsions</searchLink><br /><searchLink fieldCode="DE" term="%22Interfacial+tension%22">Interfacial tension</searchLink><br /><searchLink fieldCode="DE" term="%22Surface+tension%22">Surface tension</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+diagrams%22">Phase diagrams</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Microscopy%22">Microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Smart+materials%22">Smart materials</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: [Display omitted] The counterintuitive temperature-controlled self-faceting of water-suspended, surfactant-stabilized, liquid oil droplets provides new opportunities in engineering of smart liquids, the properties of which are controllable by external stimuli. However, many emulsions exhibiting self-faceting phenomena have limited stability due to surfactant precipitation. The emulsions' stability may be enhanced, and their inter-droplet electrostatic repulsion tuned, through controlled charge screening driven by varying-concentration added salts. Moreover, in many technologically-relevant situations, salts may already exist in the emulsion's aqueous phase. Yet, salts' impact on self-faceting effects has never been explored. We hypothesize that the self-faceting transitions' temperatures, and stability against surfactant precipitation, of ionic-surfactants-stabilized emulsions are significantly modified by salt introduction. We explore the temperature-dependent impact of NaCl and CsCl salt concentration on the emulsions' phase diagrams, employing optical microscopy of emulsion droplet shapes and interfacial tension measurements, both sensitive to interfacial phase transitions. A salt concentration dependent increase in the self-faceting transition temperatures is found, and its mechanism elucidated. Our findings allow for a significant enhancement of the emulsions' stability, and provide the physical understanding necessary for future progress in research and applications of self-faceting phenomena in salt-containing emulsions. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Colloid & Interface Science is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jcis.2022.03.146
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      – Code: eng
        Text: English
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        PageCount: 8
        StartPage: 131
    Subjects:
      – SubjectFull: Emulsions
        Type: general
      – SubjectFull: Interfacial tension
        Type: general
      – SubjectFull: Surface tension
        Type: general
      – SubjectFull: Phase diagrams
        Type: general
      – SubjectFull: Phase transitions
        Type: general
      – SubjectFull: Microscopy
        Type: general
      – SubjectFull: Smart materials
        Type: general
    Titles:
      – TitleFull: Salt-induced stability and modified interfacial energetics in self-faceting emulsion droplets.
        Type: main
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            NameFull: Nanikashvili, Pilkhaz M.
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            NameFull: Butenko, Alexander V.
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            NameFull: Deutsch, Moshe
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            NameFull: Lee, Daeyeon
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            NameFull: Sloutskin, Eli
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            – D: 01
              M: 09
              Text: Sep2022
              Type: published
              Y: 2022
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              Value: 621
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            – TitleFull: Journal of Colloid & Interface Science
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