Surfactant-Free Emulsions with Erasable Triggered Phase Inversions

Chen, Yi‐Wen; Wang, Zhen; Wang, Dingguan; Ma, Ning; Li, Cancan; Wang, Yapei

doi:10.1021/acs.langmuir.6b03189

Cited by 25 publications

(20 citation statements)

References 28 publications

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“…Based on the adopted molecular model 4,12 given in Scheme 1, HA is biomass with a high molecular weight (usually above 1000 Da) and numerous polar groups such as phenolic hydroxyl and carboxyl groups, which contributes to the sensitivity to environmental changes at the oil/water interface. 20 Herein, to the best of our knowledge, we demonstrate for the first time the effect of pH or metal ions on the oil/water interfacial behavior of HA-based surfactant. The sodium salt of HA, sodium humate (denoted as SH), is significantly enriched toward the oil/water interface at either low pH or high metal-ion concentration.…”

Section: ■ Introductionmentioning

confidence: 80%

“…However, the oil/water interfacial behavior of HA is rarely discovered and investigated up to now. Based on the adopted molecular model , given in Scheme , HA is biomass with a high molecular weight (usually above 1000 Da) and numerous polar groups such as phenolic hydroxyl and carboxyl groups, which contributes to the sensitivity to environmental changes at the oil/water interface . Herein, to the best of our knowledge, we demonstrate for the first time the effect of pH or metal ions on the oil/water interfacial behavior of HA-based surfactant.…”

Section: Introductionmentioning

confidence: 91%

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Effect of pH or Metal Ions on the Oil/Water Interfacial Behavior of Humic Acid Based Surfactant

et al. 2020

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Humic acid, a kind of widespread organic macromolecule on earth, is naturally formed through the microbial biodegradation of plant, animal, and microorganism residues. Because of the large number of active functional groups (phenolic hydroxyl and carboxyl), humic acid has been considered as a biocompatible, green, and low-cost biosurfactant recently. In this work, based on the sensitivity of humic acid to the external chemical environment, the oil/water interfacial behavior of sodium humate at different pH or in the presence of metal ions is closely investigated. Sodium humate is significantly enriched toward the oil/water interface at either low pH or high metal-ion concentration to adjust the properties of the prepared emulsion, but the mechanisms are proved to be different when considering the influence of pH and metal ions. Besides, to the best of our knowledge, humic acid based surfactant is proposed as a Pickering emulsifier for the first time, known as solid surfactant. This work promises the great potential of humic acid as a natural environment-responsive surfactant and has important implications for the application of humic acid based surfactant in industry and understanding of the role of humic acid in the natural environment.

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Section: ■ Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 91%

Effect of pH or Metal Ions on the Oil/Water Interfacial Behavior of Humic Acid Based Surfactant

et al. 2020

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“…[19] Through changing the physiochemical cues, such as osmotic pressure, pH, temperature or substance concentrations in the continuous phase, these copolymers demonstrated on-demand hydrophobicity and hydrophilicity switch to adjust the interfacial curvatures and thus triggered the phase inversion. [22] Figure 1. Copolymer, poly(dimethylsiloxane)-b-poly(2-(dimethylamino)ethyl methacrylate) (PDMS-b-PDMAEMA) could be tuned by varying either pH or ionic strength of the continuous phase.…”

Section: Phase Inversion For Multiple Emulsionsmentioning

confidence: 99%

The Horizon of the Emulsion Particulate Strategy: Engineering Hollow Particles for Biomedical Applications

Xia

et al. 2018

Advanced Materials

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With their hierarchical structures and the substantial surface areas, hollow particles have gained immense research interest in biomedical applications. For scalable fabrications, emulsion-based approaches have emerged as facile and versatile strategies. Here, the recent achievements in this field are unfolded via an "emulsion particulate strategy," which addresses the inherent relationship between the process control and the bioactive structures. As such, the interior architectures are manipulated by harnessing the intermediate state during the emulsion revolution (intrinsic strategy), whereas the external structures are dictated by tailoring the building blocks and solidification procedures of the Pickering emulsion (extrinsic strategy). Through integration of the intrinsic and extrinsic emulsion particulate strategy, multifunctional hollow particles demonstrate marked momentum for label-free multiplex detections, stimuli-responsive therapies, and stem cell therapies.

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“…The amphiphilicity of emulsifiers is another crucial factor that notably affects the emulsion stability and type [40,41,42,43]. In surfactant stabilized emulsion systems, the amphiphilicity of surfactants is defined as the relative balance between hydrophilic and hydrophobic properties of amphiphiles, which can be well described by the hydrophilic-lipophilic balance (HLB) value [2,8,44].…”

Section: Introductionmentioning

confidence: 99%

Tuning Amphiphilicity of Particles for Controllable Pickering Emulsion

Wang

2016

Materials

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Pickering emulsions with the use of particles as emulsifiers have been extensively used in scientific research and industrial production due to their edge in biocompatibility and stability compared with traditional emulsions. The control over Pickering emulsion stability and type plays a significant role in these applications. Among the present methods to build controllable Pickering emulsions, tuning the amphiphilicity of particles is comparatively effective and has attracted enormous attention. In this review, we highlight some recent advances in tuning the amphiphilicity of particles for controlling the stability and type of Pickering emulsions. The amphiphilicity of three types of particles including rigid particles, soft particles, and Janus particles are tailored by means of different mechanisms and discussed here in detail. The stabilization-destabilization interconversion and phase inversion of Pickering emulsions have been successfully achieved by changing the surface properties of these particles. This article provides a comprehensive review of controllable Pickering emulsions, which is expected to stimulate inspiration for designing and preparing novel Pickering emulsions, and ultimately directing the preparation of functional materials.

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Surfactant-Free Emulsions with Erasable Triggered Phase Inversions

Cited by 25 publications

References 28 publications

Effect of pH or Metal Ions on the Oil/Water Interfacial Behavior of Humic Acid Based Surfactant

Effect of pH or Metal Ions on the Oil/Water Interfacial Behavior of Humic Acid Based Surfactant

The Horizon of the Emulsion Particulate Strategy: Engineering Hollow Particles for Biomedical Applications

Tuning Amphiphilicity of Particles for Controllable Pickering Emulsion

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