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Bi-Continuous Emulsions Stabilized by pH-Responsive Self-Assembled Aggregates of Amphiphilic Random Copolymer with One-Step Emulsification.

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Title: Bi-Continuous Emulsions Stabilized by pH-Responsive Self-Assembled Aggregates of Amphiphilic Random Copolymer with One-Step Emulsification.
Authors: Du, Hao1 (AUTHOR), Zhang, Yun2 (AUTHOR), Yang, Yuyun1 (AUTHOR), Cao, Tongtong1,2 (AUTHOR), Li, Ming1 (AUTHOR), Cao, Yuhua1 (AUTHOR) yuhuacao64@gmail.com
Source: Polymers (20734360). Mar2026, Vol. 18 Issue 5, p619. 12p.
Subjects: Emulsions, Stabilizing agents, Random copolymers, Wetting, Rheology, Polymethacrylates
Abstract: We reported a simplified one-step emulsification strategy to prepare bi-continuous emulsions with a gel-like property using the pH-responsive self-assembled aggregates of an amphiphilic random copolymer poly (styrene-co-methacrylic acid) (P(St-co-MAA)) as the interfacial stabilizers. Using caprylic/capric triglyceride (GTCC) as the oil phase, 1.0% P(St-co-MAA) aqueous solution with a pH between 7.0 and 8.0 as the water phase, and an oil/water phase ratio of 6:4, bi-continuous emulsions could be formed directly through one-step emulsification. Systematic characterization with a fluorescence microscope, scanning electron microscope, and confocal laser scanning microscope confirmed the formation of the bi-continuous emulsions. The three-phase contact angle measurements confirmed that the surface wettability of the self-assembled aggregates changed with pH, and the three-phase contact angles of the bi-continuous emulsions formed at a pH between 7.0 and 8.0 were close to 90°. Furthermore, rheological analysis of the bi-continuous emulsion showed the storage modulus (G′) dominating over the loss modulus (G″), which verified that the bi-continuous emulsion was attributed to the existence of a three-dimensional elastic gel network. The pH-dependent wettability of the self-assembled aggregates as the stabilizers enabled pH to control the emulsion type from O/W to bi-continuous to W/O. The work provides a simple, rapid, and robust approach to preparing bi-continuous emulsions without intricate particle modifications and cumbersome procedures. [ABSTRACT FROM AUTHOR]
Copyright of Polymers (20734360) is the property of MDPI 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.)
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  Data: Bi-Continuous Emulsions Stabilized by pH-Responsive Self-Assembled Aggregates of Amphiphilic Random Copolymer with One-Step Emulsification.
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  Data: <searchLink fieldCode="JN" term="%22Polymers+%2820734360%29%22">Polymers (20734360)</searchLink>. Mar2026, Vol. 18 Issue 5, p619. 12p.
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  Data: <searchLink fieldCode="DE" term="%22Emulsions%22">Emulsions</searchLink><br /><searchLink fieldCode="DE" term="%22Stabilizing+agents%22">Stabilizing agents</searchLink><br /><searchLink fieldCode="DE" term="%22Random+copolymers%22">Random copolymers</searchLink><br /><searchLink fieldCode="DE" term="%22Wetting%22">Wetting</searchLink><br /><searchLink fieldCode="DE" term="%22Rheology%22">Rheology</searchLink><br /><searchLink fieldCode="DE" term="%22Polymethacrylates%22">Polymethacrylates</searchLink>
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  Label: Abstract
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  Data: We reported a simplified one-step emulsification strategy to prepare bi-continuous emulsions with a gel-like property using the pH-responsive self-assembled aggregates of an amphiphilic random copolymer poly (styrene-co-methacrylic acid) (P(St-co-MAA)) as the interfacial stabilizers. Using caprylic/capric triglyceride (GTCC) as the oil phase, 1.0% P(St-co-MAA) aqueous solution with a pH between 7.0 and 8.0 as the water phase, and an oil/water phase ratio of 6:4, bi-continuous emulsions could be formed directly through one-step emulsification. Systematic characterization with a fluorescence microscope, scanning electron microscope, and confocal laser scanning microscope confirmed the formation of the bi-continuous emulsions. The three-phase contact angle measurements confirmed that the surface wettability of the self-assembled aggregates changed with pH, and the three-phase contact angles of the bi-continuous emulsions formed at a pH between 7.0 and 8.0 were close to 90°. Furthermore, rheological analysis of the bi-continuous emulsion showed the storage modulus (G′) dominating over the loss modulus (G″), which verified that the bi-continuous emulsion was attributed to the existence of a three-dimensional elastic gel network. The pH-dependent wettability of the self-assembled aggregates as the stabilizers enabled pH to control the emulsion type from O/W to bi-continuous to W/O. The work provides a simple, rapid, and robust approach to preparing bi-continuous emulsions without intricate particle modifications and cumbersome procedures. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Polymers (20734360) is the property of MDPI 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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        Value: 10.3390/polym18050619
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        Text: English
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      – SubjectFull: Emulsions
        Type: general
      – SubjectFull: Stabilizing agents
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      – SubjectFull: Random copolymers
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      – SubjectFull: Wetting
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      – SubjectFull: Rheology
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      – SubjectFull: Polymethacrylates
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      – TitleFull: Bi-Continuous Emulsions Stabilized by pH-Responsive Self-Assembled Aggregates of Amphiphilic Random Copolymer with One-Step Emulsification.
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              M: 03
              Text: Mar2026
              Type: published
              Y: 2026
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