Tailoring the size of silver nanoparticles by controlling mixing in microreactors

Gao, Yunhu; Pinho, Bruno; Torrente‐Murciano, Laura

doi:10.1016/j.cej.2021.134112

Cited by 29 publications

(28 citation statements)

References 38 publications

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“…Gao et al. [ 310 ] compared several coiled reactors and demonstrated that the alternating‐axes reactor can minimize the size and distribution of Ag NPs (4.3 nm with 25% standard deviation) in comparison to other coiled reactors. Using fluid dynamic simulations, they demonstrated that the decrease in size is directly related to the degree of mixing in the reactors.…”

Section: Synthesis Of Materials In Flow (Micro)reactors With Ex Situ ...mentioning

confidence: 99%

“…In particular, the alternating‐axes reactor enhances radial mixing by not only promoting the formation of Dean vortices but also by breaking the stagnant volume within the vortices by frequent and periodic changes in the coil, which therefore changes the direction of the Dean vortices. [ 310 ]…”

Section: Synthesis Of Materials In Flow (Micro)reactors With Ex Situ ...mentioning

confidence: 99%

“…quantified the mixing at the entrance of microreactors using mixing index (MI), finding out a direct relationship between MI and particle size for the synthesis of Ag nanoparticles. [ 310 ] The size of Ag NPs was reduced from 6.5 to 4.6 nm when the MI was increased from ≈0.19 to 0.5–0.6. In a different study, Au NPs with sizes of 1.0 ± 0.4 nm were achieved, thanks to the fast reduction of Au(III) precursor to Au(0) within 10 ms with additional growth for a further 10 ms. [ 144 ] Such kinetic data were enabled using a flow reactor equipped with in situ XAS characterization with t r0 of 6 ms.…”

Section: Synthesis Of Materials In Flow (Micro)reactors With Ex Situ ...mentioning

confidence: 99%

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Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Pinho

Zhang

Hoye

et al. 2022

Advanced Optical Materials

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Reducing the dimensionality of materials from bulk thin films and single crystals to nanocrystals (NCs) and quantum dots This review paper analyzes the importance of monitoring the synthesis of plasmonic and optoelectronic materials to provide a mechanistic understanding of their nucleatiçon and growth, as well as crucial kinetic insights to enable their future development. Light-interacting nanoparticles present strong size-property relationships, such that size control is at the core of any synthetic development. However, conventional ex situ characterization of these materials has heavily limited their development to simple trial-and-error approaches. Over the last decade, the development of in situ and online characterization capabilities has transformed the understanding of mechanistic models. In addition, time-resolved data are able to reveal the step rate, even for phenomena taking place in the microsecond timescale (i.e., nucleation), thanks to the use of micro-flow-reactors. However, the literature contains a few disagreements and inaccuracies, which are considered to be due to the general lack of attention and control on mixing (relevant when mixing time is comparable to the reaction time), and the presence of additives during synthesis (e.g., stabilizers). Finally, it is believed that recent in situ monitoring development coupled with reactor design brings unique opportunities to not only synthesize nanoparticles in a reproducible and controllable manner, but also gives data-rich approaches for self-regulated and automated systems.

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Section: Synthesis Of Materials In Flow (Micro)reactors With Ex Situ ...mentioning

confidence: 99%

Section: Synthesis Of Materials In Flow (Micro)reactors With Ex Situ ...mentioning

confidence: 99%

Section: Synthesis Of Materials In Flow (Micro)reactors With Ex Situ ...mentioning

confidence: 99%

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Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Pinho

Zhang

Hoye

et al. 2022

Advanced Optical Materials

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“…Reactor designs and fluid flow inside the microreactors can enhance and regulate the mixing that would allow controlled synthesis and assembly of nanomaterials. Gao et al 182 extensively investigated tuning the size of silver particles by holding the mixing of precursors in different reactor designs and presented a detailed comparison of these reactive designs. The mixing efficiencies of reactors are enhanced by curvature, segmentation by Taylor flow, or static mixers.…”

Section: Reactor Design Fluid Flow and Mixingmentioning

confidence: 99%

“…183 Diffusion-limited mixing in single-phase flow reactors is enhanced by 3D reactor designs by creating dean vortices inside the reactor or with another mixing condition depending on the application. 182,[184][185][186] For example, helical, planar serpentine, alternating axis, and straight tube reactors (Fig. 9a) are examined to control the size of the Ag nanoparticles.…”

Section: Reactor Design Fluid Flow and Mixingmentioning

confidence: 99%

Transformation, reaction and organization of functional nanostructures using solution-based microreactor-assisted nanomaterial deposition for solar photovoltaics

Doddapaneni

Dhas

Chang

et al. 2022

MRS Energy & Sustainability

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Microreactor-Assisted Nanomaterial Deposition (MAND) process offers unique capabilities in achieving large size and shape control levels while providing a more rapid path for scaling via process intensification for nanomaterial production. This review highlights the application of continuous flow microreactors to synthesize, assemble, transform, and deposit nanostructured materials for Solar Photovoltaics, the capabilities of MAND in the field, and the potential outlook of MAND.Microreactor-Assisted Nanomaterial Deposition (MAND) is a promising technology that synthesizes reactive fluxes and nanomaterials to deposit nanostructured materials at the point of use. MAND offers precise control over reaction, organization, and transformation processes to manufacture nanostructured materials with distinct morphologies, structures, and properties. In synthesis, microreactor technology offers large surface-area-to-volume ratios within microchannel structures to accelerate heat and mass transport. This accelerated transport allows for rapid changes in reaction temperatures and concentrations, leading to more uniform heating and mixing in the deposition process. The possibility of synthesizing nanomaterials in the required volumes at the point of application eliminates the need to store and transport potentially hazardous materials. Further, MAND provides new opportunities for tailoring novel nanostructures and nano-shaped features, opening the opportunity to assemble unique nanostructures and nanostructured thin films. MAND processes control the heat transfer, mass transfer, and reaction kinetics using well-defined microstructures of the active unit reactor cell that can be replicated at larger scales to produce higher chemical production volumes. This critical feature opens a promising avenue in developing scalable nanomanufacturing. This paper reviews advances in microreactor-assisted nanomaterial deposition of nanostructured materials for solar photovoltaics. The discussions review the use of microreactors to tailor the reacting flux, transporting to substrate surfaces via controlling process parameters such as flow rates, pH of the precursor solutions, and seed layers on the formation and/or transformation of intermediary reactive molecules, nanoclusters, nanoparticles, and structured assemblies. In the end, the review discusses the use of an industrial scale MAND to apply anti-reflective and anti-soiling coatings on the solar modules in the field and details future outlooks of MAND reactors. Graphical abstract

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Integrated Microsystem Toward High‐Throughput Automated Green Synthesis and Raman Enhancement Performance Screening of Noble‐Metal@Cu‐MOF

Fan

Luo

Tian

et al. 2023

Adv Funct Materials

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Green Synthesis" has been broadly applied in drug synthesis and nanomaterial preparation. The integration of automated micro-synthesis and high-throughput screening systems is a key way to achieve the goal of green manufacturing. Here, a one-click green synthesis platform is designed that integrates droplets arrays-based micro-synthesis for Raman enhancement performance high-throughput screening of MNPs

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Tailoring the size of silver nanoparticles by controlling mixing in microreactors

Cited by 29 publications

References 38 publications

Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Importance of Monitoring the Synthesis of Light‐Interacting Nanoparticles – A Review on In Situ, Ex Situ, and Online Time‐Resolved Studies

Transformation, reaction and organization of functional nanostructures using solution-based microreactor-assisted nanomaterial deposition for solar photovoltaics

Integrated Microsystem Toward High‐Throughput Automated Green Synthesis and Raman Enhancement Performance Screening of Noble‐Metal@Cu‐MOF

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