In-situ fabrication of metal oxide nanocaps based on biphasic reactions with surface nanodroplets

Wei, Zixiang; Dabodiya, Tulsi Satyavir; Chen, Jian; Lu, Qiuyun; Qian, Jiasheng; Meng, Jia; Zeng, Hongbo; Qian, Hui; Zhang, Xuehua

doi:10.1016/j.jcis.2021.10.093

Cited by 9 publications

(8 citation statements)

References 62 publications

(57 reference statements)

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“…[42] The final structure consisted of clusters of silver nanoparticles on the droplet base area. In contrast, from droplet reaction, porous metal oxides took the shape of nanocaps with spatial arrangement and surface coverage predetermined by droplets, [43] resembling a superparticle assembly from evaporation of multicomponent droplets [44]. In the case of polymeric microdents with a crater shape, droplet liquid dissolved the superficial polymer layer, and then the dissolved polymer was deposited preferentially along the rim during droplet dissolution [45].…”

Section: Au Ion Absorption At Dt Droplet Surfacementioning

confidence: 99%

Sequential droplet reactions for surface-bound gold nanocrater array

Dabodiya

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Section: Au Ion Absorption At Dt Droplet Surfacementioning

confidence: 99%

Sequential droplet reactions for surface-bound gold nanocrater array

Dabodiya

et al. 2022

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…Furthermore, the immobilization process plays a crucial role in determining the properties of the resulting photocatalyst on the glass surface. Recently, our research has developed a novel method for fabricating metal oxide nanocaps with high stability, utilizing a solvent exchange process (SEP) as a droplet-based synthesis approach for immobilizing photocatalysts on substrates. − The SEP relies on dilution-induced liquid–liquid phase separation, where a good solvent for a solute is displaced by a poor solvent, leading to the oversaturation of the solute and subsequent nucleation and growth of immobilized droplets at the solid–liquid interface . After the reaction with metal ions, the precursor of the surface-bound metal oxide is formed on the substrate.…”

Section: Introductionmentioning

confidence: 99%

“…After the reaction with metal ions, the precursor of the surface-bound metal oxide is formed on the substrate. Wei et al demonstrated that the size distribution, surface coverage, porosity, and location of the final products can be finely tuned by adjusting the solution components and flow conditions in the SEP, which have significant implications for the photocatalytic applications of the material. ,− …”

Section: Introductionmentioning

confidence: 99%

Immobilization of Photocatalytic ZnO Nanocaps on Planar and Curved Surfaces for the Photodegradation of Organic Contaminants in Water

Li,

Lu,

Gamal EI-Din

et al. 2023

ACS EST Water

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Nanoparticles are widely used as photocatalysts to effectively remove organic contaminants in water. However, additional separation steps are needed to recycle the dispersed photocatalysts from the treated water. This study demonstrates a simple strategy to fabricate surface-bound catalytic nanoparticles for water treatment. In our approach, catalytic zinc oxide (ZnO) nanocaps were immobilized on planar and curved substrates by in-situ fabrication from surface nanodroplets using a newly established solvent exchange process (SEP). The size distribution, surface coverage, and porosity of the nanocaps can be controlled by changing the solution composition during the SEP on both planar and curved surfaces. The photocatalytic performance of ZnO nanocaps under solar light was evaluated by comparing the degradation of three model compounds (methyl orange (MO) and two antibiotics norfloxacin (NFX) and sulfamethoxazole (SMX)). Nonporous ZnO nanocaps immobilized on a curved glass surface showed good performance for contaminants degradation, achieving over 90% removal of MO, NFX and SMX in 20 h under solar irradiation of 1 sun intensity, compared to the negligible degradation percentages (except for NFX) without nanocaps. Our results suggest that nonporous ZnO nanocaps immobilized on the inner surface of a transparent container are a promising and sustainable approach for solar-driven water treatment.

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“…The literature reported the applications of reacting surface nanodroplets in the fabrication of surface-bound nanomaterials and surface-enhanced Raman spectroscopy (SERS). 36,37 Because chemical acceleration is mainly attributed to the important impact of the physical and chemical properties of the interface, the enhancement may be expected to decay to a certain extent with the distance from the droplet surface. A remaining question is whether the reaction rate inside the droplets is spatially uniform.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In particular, the bubble growth rates scaled with the droplet radius R with a power law of R – n with n = 0.7 to 2.4. The literature reported the applications of reacting surface nanodroplets in the fabrication of surface-bound nanomaterials and surface-enhanced Raman spectroscopy (SERS). , …”

Section: Introductionmentioning

confidence: 99%

Growth Rates of Hydrogen Microbubbles in Reacting Femtoliter Droplets

Zeng

Zhang

2022

Langmuir

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Chemical reactions in small droplets are extensively explored to accelerate the discovery of new materials and increase the efficiency and specificity in catalytic biphasic conversion and high-throughput analytics. In this work, we investigate the local rate of the gas-evolution reaction within femtoliter droplets immobilized on a solid surface. The growth rate of hydrogen microbubbles (≥500 nm in radius) produced from the reaction was measured online with high-resolution confocal microscopic images. The growth rate of bubbles was faster in smaller droplets and near the droplet rim in the same droplet. The results were consistent for both pure and binary reacting droplets and on substrates of different wettability. Our theoretical analysis based on diffusion, chemical reaction, and bubble growth predicted that the concentration of the reactant depended on the droplet size and the bubble location inside the droplet, in good agreement with experimental results. Our results reveal that the reaction rate may be spatially nonuniform in the reacting microdroplets. The findings may have implications for formulating the chemical properties and uses of these droplets.

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In-situ fabrication of metal oxide nanocaps based on biphasic reactions with surface nanodroplets

Cited by 9 publications

References 62 publications

Sequential droplet reactions for surface-bound gold nanocrater array

Sequential droplet reactions for surface-bound gold nanocrater array

Immobilization of Photocatalytic ZnO Nanocaps on Planar and Curved Surfaces for the Photodegradation of Organic Contaminants in Water

Growth Rates of Hydrogen Microbubbles in Reacting Femtoliter Droplets

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