Fabrication of solvent transfer-induced phase separation bijels with mixtures of hydrophilic and hydrophobic nanoparticles

Vitantonio, Giuseppe Di; Lee, Daeyeon; Stebe, Kathleen J.

doi:10.1039/d0sm00071j

Cited by 11 publications

(6 citation statements)

References 28 publications

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“…reported a pioneering work on the preparation of bijel-structured droplets by TIPS using a specific emulsion system of nitromethane/ethanediol in the presence of silica particles with neutral wetting properties . Haase et al extended applicable emulsion systems to bijel by introducing a ternary emulsion system and in situ surface modification method for nanoparticles using microfluidics. ,, They demonstrated the continuous preparation of bijel fibers based on solvent transfer-induced phase separation (STRIPS). In STRIPS, phase separation is induced by the diffusion of a cosolvent from a homogeneously dispersed phase composed of a ternary system of water, oil, and cosolvent into a continuous aqueous phase in the microchannel.…”

Section: Introductionmentioning

confidence: 99%

Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates

Masaoka,

Ishida,

Watanabe

et al. 2024

Langmuir

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Designing porous structures is key in materials science, particularly for separation, catalysis, and cell culture systems. Bicontinuous interfacially jammed emulsion gels represent a unique class of soft matter formed by kinetically arresting the separation of the spinodal decomposition phase, which is stabilized by colloidal particles with neutral wetting. This study introduces a microfluidic technique to create highly interconnected open-porous particles using bijel droplets stabilized with hexadecyltrimethylammonium bromide (CTAB)-modified silica particles. Monodisperse droplets comprising a hydrophobic monomer, water, ethanol, silica particles, and CTAB were initially formed in the microfluidic device. The diffusion of ethanol from these droplets into the continuous cyclohexane phase triggered spinodal decomposition within the droplets. The phase-separated structure within the droplets was stabilized by the CTAB-modified silica particles, and subsequent photopolymerization yielded microparticles with highly interconnected, open pores. Moreover, the influence of the ratio of the CTAB and silica particles, fluid composition, and microchannel direction on the final structure of the microparticles was explored. Our findings indicated that the phase-separated structure of the particles transitioned from oil-in-water to water-in-oil as the CTAB/silica ratio was increased. At intermediate CTAB/silica ratios, microparticles with bicontinuous structures were formed. Regardless of the fluid composition, the pore size of the particles increased with time after phase separation. However, this coarsening was arrested 15 s after droplet formation in the CTAB-modified silica particles, accompanied by a change in the particle shape from spherical to ellipsoidal. In situ observations of the bijel droplet formation revealed that the particle shape deformation is caused by the rolling of elastic bijel droplets at the bottom of the microchannel. As such, the channel setup was altered from horizontal to vertical to prevent the deformation of bijel droplets, resulting in spherical particles with open pores.

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Section: Introductionmentioning

confidence: 99%

Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates

Masaoka,

Ishida,

Watanabe

et al. 2024

Langmuir

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“…In recent years, although extensive progress has been made in bionic preparation of rough surface structures, the existing research results are far from being truly applied. This is because the bionic preparation of rough surface structures usually adopts electrospinning, [12] phase separation, [13] layer by layer self-assembly, [14] template method, [15][16][17] photolithography, [18][19] 3D printing [20][21] and other technologies. [22][23][24][25] These technologies have flexible design advantages in constructing uniform and regular microstructure on the surface.…”

Section: Introductionmentioning

confidence: 99%

AlPO₄ film with rose surface structure: One‐step coating process, superhydrophilic and rapid super‐spreading

Wang¹,

Xu²,

Wang³

et al. 2022

Nano Select

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The construction of superhydrophilic surface structure usually requires auxiliary means with the aid of equipment or templates, and so on, which leads to the disadvantages of complicated production processes and high production costs. Here, we report a simple and rapid sol‐gel process to prepare large‐area, rose‐like AlPO4 arrays through precise control of the low‐temperature self‐assembly process. The innovative application of AlPO4 array membrane to the superhydrophilic field, achieves a contact angle of less than 5° with 4 μL of water in 10 ms. The prepared AlPO4 superhydrophilic coated glass has good visible light transmittance, good wear resistance and durability. In addition, the morphology and size of AlPO4 array depend on the low temperature process and the composition of the sol, which can be adjusted by controlling the process. The study of this wet chemical route will provide useful information for the design and preparation of biomimetic micro‐nano structures.

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“…The nanometer pores greatly increase the specific surface area of STRIPS-formed fibers, which boosts their potential applications in filtration . In addition, pores on the surface and also inside STRIPS-formed bijels fibers may be tailored. , Owing to the possibility of large-scale fabrication and tunable surface and internal microstructures, STRIPS-formed bijels have the potential in applications such as separation, catalysis, and microreaction. , Currently, bijels via STRIPS have also been made by using a mixture of hydrophilic and hydrophobic nanoparticles to stabilize the interface . However, further developments in STRIPS are needed to overcome its shortcomings such as poor mechanical properties of bijels.…”

Section: Introductionmentioning

confidence: 99%

“…13,15 Currently, bijels via STRIPS have also been made by using a mixture of hydrophilic and hydrophobic nanoparticles to stabilize the interface. 16 However, further developments in STRIPS are needed to overcome its shortcomings such as poor mechanical properties of bijels. One way is to produce composite bijels with high-tensile strength using a microfluidic twisting process.…”

Section: Introductionmentioning

confidence: 99%

Phase Inversion-Based Technique for Fabricating Bijels and Bijels-Derived Structures with Tunable Microstructures

Sun

Wang

2020

Langmuir

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Bicontinuous interfacially jammed emulsion gels ("bijels") are a new class of soft matter containing two interpenetrating continuous phases. They have great potential for applications in many areas. However, difficulties in fabricating bijels and controlling structural features of interest have posed severe barriers to their wide applications. In this study, a phase inversion-based technique was developed for fabricating bijels and bijels-derived structures. The effects of varying the composition of casting solutions for the fabrication of bijels on the porosity, oil-towater percentage, and domain size of bijels were investigated. Composite bijels prepared from two organic monomers were also made, demonstrating the flexibility of the phase inversion-based technique for the fabrication of bijels. Interestingly, the incorporation of a second monomer into the casting solution also affected the porosity and domain size of bijels formed, which may provide a new strategy for the controlled fabrication of bijels. Doxorubicin hydrochloride (DOX, as a model drug)-loaded bijels-derived hybrid hydrogels comprising two continuous phases were successfully made, with one phase being cross-linked alginate that carried the drug. Controlled release of DOX from the bijels-derived structures could be achieved. In vitro degradation study indicated that cross-linking of alginate in bijels-derived hybrid hydrogels controlled alginate degradation, thereby affecting the DOX release behavior. Our current work has provided a facile and reproducible protocol for the controlled fabrication of bijels and bijels-derived structures, which facilitates expanding their applications in the biomedical field.

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Fabrication of solvent transfer-induced phase separation bijels with mixtures of hydrophilic and hydrophobic nanoparticles

Abstract:
Solvent transfer-induced phase separation bijels with oils of different polarity are fabricated by using a mixture of hydrophilic and hydrophobic silica nanoparticles, further expanding their potential applications in separation and catalysis.

Cited by 11 publications

References 28 publications

Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates

Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates

AlPO₄ film with rose surface structure: One‐step coating process, superhydrophilic and rapid super‐spreading

Phase Inversion-Based Technique for Fabricating Bijels and Bijels-Derived Structures with Tunable Microstructures

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Fabrication of solvent transfer-induced phase separation bijels with mixtures of hydrophilic and hydrophobic nanoparticles

Abstract: Solvent transfer-induced phase separation bijels with oils of different polarity are fabricated by using a mixture of hydrophilic and hydrophobic silica nanoparticles, further expanding their potential applications in separation and catalysis.

Cited by 11 publications

References 28 publications

Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates

Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates

AlPO4 film with rose surface structure: One‐step coating process, superhydrophilic and rapid super‐spreading

Phase Inversion-Based Technique for Fabricating Bijels and Bijels-Derived Structures with Tunable Microstructures

Contact Info

Product

Resources

About

Abstract:
Solvent transfer-induced phase separation bijels with oils of different polarity are fabricated by using a mixture of hydrophilic and hydrophobic silica nanoparticles, further expanding their potential applications in separation and catalysis.

AlPO₄ film with rose surface structure: One‐step coating process, superhydrophilic and rapid super‐spreading