Self-assembly of TiO2/Fe3O4/SiO2 microbeads: A green approach to produce magnetic photocatalysts

Brossault, David F.F.; McCoy, Thomas M.; Routh, Alexander F.

doi:10.1016/j.jcis.2020.10.001

Cited by 29 publications

(19 citation statements)

References 47 publications

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“…5,7 However, it has a wide energy band gap (3.0-3.2 eV, which means it only reacts to UV) and a high carrier recombination rate. 21,22 So far, much effort has been made to make up for these shortcomings, such as metal doping, 23 non-metal doping, 24,25 and building a heterogeneous semiconductor composite. [26][27][28] However, there are some problems in metal doping, such as thermal instability, toxicity, and high cost.…”

Section: Introductionmentioning

confidence: 99%

The preparation of three-dimensional flower-like TiO₂/TiOF₂ photocatalyst and its efficient degradation of tetracycline hydrochloride

Hou

Liu

2021

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

The preparation of three-dimensional flower-like TiO₂/TiOF₂ photocatalyst and its efficient degradation of tetracycline hydrochloride

Hou

Liu

2021

RSC Adv.

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“…This aggregation approach has recently been reported in reverse emulsions for room-temperature production of magnetic silica microparticles (Fe 3 O 4 /SiO 2 ) 46 and magnetic photocatalysts (TiO 2 /Fe 3 O 4 /SiO 2 ). 47 Here, formation of an O/W/O emulsions serves to structurally template the assembly of capsules, with multiple oil cores embedded within their structure.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Multicore Colloidosomes: Nanoparticle-Assembled Capsules with Adjustable Size, Internal Structure, and Functionalities for Oil Encapsulation

Brossault

McCoy

Routh

2021

ACS Appl. Mater. Interfaces

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Colloidosomes, also known as Pickering emulsion capsules, have attracted attention for encapsulation of hydrophilic and hydrophobic actives. However, current preparation methods are limited to single core structures and require the use of modified/engineered nanoparticles for forming the shell. Here, we report a fast, simple, and versatile method for producing multi-oil core silica colloidosomes via salt-driven assembly of purely hydrophilic commercial nanoparticles dispersed within an oil-inwater-in-oil (O/W/O) double emulsion template. The internal structure and overall diameter of the capsules can be adjusted by altering the primary and secondary emulsification conditions. With this approach, 7−35 μm diameter multicore colloidosomes containing 0.9−4.2 μm large oil cores were produced. The capsules can easily be functionalized depending on the type of nanoparticles used in the preparation process. Here, metal oxide nanoparticles, such as Fe 3 O 4 , TiO 2 , and ZnO, were successfully incorporated within the structure, conferring specific functional properties (i.e., magnetism and photocatalysis) to the final microcapsules. These capsules can also be ruptured by using ultrasound, enabling easy access to the internal core environments. Therefore, we believe this work offers a promising approach for producing multicore colloidosomes with adjustable structure and functionalities for the encapsulation of hydrophobic actives.

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“…Addition of calcium chloride induces surface charge screening and subsequent nanoparticle agglomeration. This hetero-coagulation approach has recently been reported in reverse emulsions for room-temperature production of magnetic silica microparticles (Fe3O4/SiO2) [46] and magnetic photocatalysts (TiO2/Fe3O4/SiO2) [47] . Here, formation of an O/W/O emulsion serves to structurally template assembly of the capsules, with multiple oil cores embedded within their structure.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Multicore Colloidosomes: Nanoparticle-Assembled Capsules with Adjustable Size, Internal Structure, and Functionalities for Oil Encapsulation

Brossault

McCoy

Routh

2021

Preprint

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View full text Add to dashboard Cite

Colloidosomes, also known as Pickering emulsion capsules, have attracted attention for encapsulation of hydrophilic and hydrophobic actives. However, current preparation methods are limited to single core structures and require the use of modified/engineered nanoparticles for forming the shell. Here, we report a fast, simple, and versatile method for producing multi-oil core silica colloidosomes via salt-driven assembly of purely hydrophilic commercial nanoparticles dispersed within an Oil-In-Water-In-Oil (O/W/O) double emulsion template. The internal structure and overall diameter of the capsules can be adjusted by altering the primary and secondary emulsification conditions. With this approach, 7 to 35 µm diameter multicore colloidosomes containing 0.9 to 4.2 µm large oil cores were produced. The capsules can easily be functionalized depending on the type of nanoparticles used in the preparation process. Here, metal oxide nanoparticles, such as Fe3O4, TiO2 and ZnO, were successfully incorporated within the structure, conferring specific functional properties (i.e. magnetism, photocatalysis) to the final microcapsules. These capsules can also be ruptured using ultrasound, enabling easy access to the internal core environments. Therefore, we believe this work offers a promising approach for producing multicore colloidosomes with adjustable structure and functionalities for the encapsulation of hydrophobic actives.

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Self-assembly of TiO2/Fe3O4/SiO2 microbeads: A green approach to produce magnetic photocatalysts

Cited by 29 publications

References 47 publications

The preparation of three-dimensional flower-like TiO₂/TiOF₂ photocatalyst and its efficient degradation of tetracycline hydrochloride

The preparation of three-dimensional flower-like TiO₂/TiOF₂ photocatalyst and its efficient degradation of tetracycline hydrochloride

Preparation of Multicore Colloidosomes: Nanoparticle-Assembled Capsules with Adjustable Size, Internal Structure, and Functionalities for Oil Encapsulation

Preparation of Multicore Colloidosomes: Nanoparticle-Assembled Capsules with Adjustable Size, Internal Structure, and Functionalities for Oil Encapsulation

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Self-assembly of TiO2/Fe3O4/SiO2 microbeads: A green approach to produce magnetic photocatalysts

Cited by 29 publications

References 47 publications

The preparation of three-dimensional flower-like TiO2/TiOF2 photocatalyst and its efficient degradation of tetracycline hydrochloride

The preparation of three-dimensional flower-like TiO2/TiOF2 photocatalyst and its efficient degradation of tetracycline hydrochloride

Preparation of Multicore Colloidosomes: Nanoparticle-Assembled Capsules with Adjustable Size, Internal Structure, and Functionalities for Oil Encapsulation

Preparation of Multicore Colloidosomes: Nanoparticle-Assembled Capsules with Adjustable Size, Internal Structure, and Functionalities for Oil Encapsulation

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Product

Resources

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The preparation of three-dimensional flower-like TiO₂/TiOF₂ photocatalyst and its efficient degradation of tetracycline hydrochloride

The preparation of three-dimensional flower-like TiO₂/TiOF₂ photocatalyst and its efficient degradation of tetracycline hydrochloride