Interfacial stabilization by soft Janus nanoparticles

Schröder, Jan; Doroshenko, Mikheil; Pirner, Daniela; Mauer, Miriam E. J.; Förster, Beate; Boyko, Volodymyr; Reck, Bernd; Roschmann, Konrad J.; Müller, Axel H. E.; Förster, Stephan

doi:10.1016/j.polymer.2016.09.083

Cited by 25 publications

(16 citation statements)

References 14 publications

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“…37 The adsorption of Janus particles at interfaces has attracted increasing attention. 47,48 Solid Janus particles have been shown to be effective emulsifiers; for example, Pickering-type emulsions obtained using Janus particles were more stable than those obtained using solid particles with homogeneous surfaces. [32][33][34][35][36][37][38]49 In contrast to particles with uniform surface wettability, Janus particles can be fabricated with two distinct surface regions that exhibit different wettabilities.…”

Section: ■ Introductionmentioning

confidence: 99%

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Gas Bubbles Stabilized by Janus Particles with Varying Hydrophilic–Hydrophobic Surface Characteristics

Fujii¹,

Yokoyama²,

Nakayama³

et al. 2017

Langmuir

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Micrometer-sized polymer-grafted gold-silica (Au-SiO) Janus particles were fabricated by vacuum evaporation followed by polymer grafting. The Janus particle diameter, diameter distribution, morphology, surface chemistry, and water wettability were characterized by optical microscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, and contact angle measurements. The optical microscopy results showed that the polystyrene (PS)-grafted Au-SiO Janus particles exhibited monolayer adsorption at the air-water interface and could stabilize bubbles, preventing their coalescence for more than 1 month. The hydrophobic PS-grafted Au and hydrophilic SiO surfaces were exposed to the air and water phases, respectively. Bare Au-SiO and poly(2-(perfluorobutyl)ethyl methacrylate) (PPFBEM)-grafted Au-SiO Janus particles could also stabilize bubbles for up to 2 weeks. By contrast, bare silica particles did not stabilize bubbles and were dispersed in water. The bubbles that formed in the PS-grafted Janus particle system were more stable than those formed in the bare Au-SiO Janus particles, PPFBEM-grafted Au-SiO Janus particles, and SiO particle systems because of the high adsorption energy of the PS-grafted particles at the air-water interface.

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Section: ■ Introductionmentioning

confidence: 99%

“…al. 48 attempted to use surface-active Janus particles that can stabilize emulsions to stabilize bubbles in water; however, they did not obtain stable bubbles. In another study, Skelhon et al 52 indicated that Janus particles can stabilize bubbles but gave few/no experimental details or characterization results.…”

Section: ■ Introductionmentioning

confidence: 99%

Gas Bubbles Stabilized by Janus Particles with Varying Hydrophilic–Hydrophobic Surface Characteristics

Fujii¹,

Yokoyama²,

Nakayama³

et al. 2017

Langmuir

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“…Surfactant commonly refers to those where addition can significantly change the interface properties of the solution and is associated with substances that were dissolved in water to reduce its surface energy. The double-faced polymeric JNPs have been used as stabilizers of emulsions and could deliver functional species at the interface, which broadens the definition of surfactants than only agents consisting of anion and/or the cation due to their amphiphilicity. ,− …”

Section: Solid Surfactant Agentsmentioning

confidence: 99%

Janus Nanoparticles: From Fabrication to (Bio)Applications

et al. 2021

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Janus nanoparticles (JNPs) refer to the integration of two or more chemically discrepant composites into one structure system. Studies into JNPs have been of significant interest due to their interesting characteristics stemming from their asymmetric structures, which can integrate different functional properties and perform more synergetic functions simultaneously. Herein, we present recent progress of Janus particles, comprehensively detailing fabrication strategies and applications. First, the classification of JNPs is divided into three blocks, consisting of polymeric composites, inorganic composites, and hybrid polymeric/inorganic JNPs composites. Then, the fabrication strategies are alternately summarized, examining self-assembly strategy, phase separation strategy, seed-mediated polymerization, microfluidic preparation strategy, nucleation growth methods, and masking methods. Finally, various intriguing applications of JNPs are presented, including solid surfactants agents, micro/nanomotors, and biomedical applications such as biosensing, controlled drug delivery, bioimaging, cancer therapy, and combined theranostics. Furthermore, challenges and future works in this field are provided.

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“…Amphipathic particles can combine their anisotropic wettability and high interfacial activity with the Pickering character to irreversibly adsorb to the interface. Very recently, further progress has been made in the application of amphipathic particles as solid surfactants to effectively stabilize emulsions and achieve longer-term stability as compared to those stabilized by low molecular weight surfactants and homogeneous particles [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Nevertheless, the amphiphilic fluorinated silica nanoparticles are rarely synthesized for the stabilization of the air–water surface.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Investigation of Foaming Amphiphilic Fluorinated Nanoparticles for Enhanced Oil Recovery

Wang

et al. 2017

Materials

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Amphiphilic nanoparticles have attracted increasing interest as Pickering emulsifiers owing to the combined advantages of both traditional surfactants and homogeneous particles. Here, foaming amphiphilic fluorinated nanoparticles were prepared for enhanced oil recovery by the toposelective surface modification method. The structure and properties of amphiphilic nanoparticles were characterized using Fourier transform infrared spectroscopy, scanning electron microscopy, a laser diffraction method, fluorescence microscopy, a pendant drop tensiometer, and foamscan. It was found that the amphiphilic fluorinated nanoparticles exhibited significant interfacial activity at the air–water interface and generated stabilized aqueous foams against coalescence and drainage even in the absence of surfactants. When the particle concentration reached 0.6 wt %, the adsorption of the amphiphilic nanoparticles at the interface was saturated and the equilibrium surface tension dropped to around 32.7 mN/m. When the particle concentration reached 0.4 wt %, the Gibbs stability criterion was fulfilled. The amphiphilic nanoparticles foam system has a better plugging capacity and enhanced oil recovery capacity. The results obtained provide fundamental insights into the understanding of the self-assembly behavior and foam properties of amphiphilic fluorinated nanoparticles and further demonstrate the future potential of the amphiphilic nanoparticles used as colloid surfactants for enhanced oil recovery applications.

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Interfacial stabilization by soft Janus nanoparticles

Cited by 25 publications

References 14 publications

Gas Bubbles Stabilized by Janus Particles with Varying Hydrophilic–Hydrophobic Surface Characteristics

Gas Bubbles Stabilized by Janus Particles with Varying Hydrophilic–Hydrophobic Surface Characteristics

Janus Nanoparticles: From Fabrication to (Bio)Applications

Preparation and Investigation of Foaming Amphiphilic Fluorinated Nanoparticles for Enhanced Oil Recovery

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