The effect of electric field intensification at interparticle contacts in microwave sintering

Qiao, Xiuchen; Xie, Xiaolin

doi:10.1038/srep32163

Cited by 27 publications

(3 citation statements)

References 35 publications

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“…Said field intensification at the interparticle contact point can also generate plasma formation. Glow formation was theorized in several field-assisted sintering process like spark plasma sintering [190] and microwave sintering [191,192], although no evidences of the typical emission lines associated with air glow have been provided so far in flash sintering experiments [41,44,45].…”

Section: Grain Boundary Overheatingmentioning

confidence: 99%

Flash sintering of ceramics

Biesuz

Sglavo

2019

Journal of the European Ceramic Society

338

208

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Section: Grain Boundary Overheatingmentioning

confidence: 99%

Flash sintering of ceramics

Biesuz

Sglavo

2019

Journal of the European Ceramic Society

338

208

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“…This phenomenon is referred to as photonic communications between microspheres. [ 85 ] The smooth surface of PDMS microspheres can be confirmed by both the bright reflection spots at the center of microspheres [ 86 ] (brown arrow in Figure 3d) and scanning electron microscope (SEM) images (Figure 3f), providing the origin of such photonic communication. [ 87 ] In addition, such hexagonally packed assemblies (Figure 3d) in turn confirmed the size uniformity of PDMS microspheres.…”

Section: Resultsmentioning

confidence: 99%

Parallelization of Microfluidic Droplet Junctions for Ultraviscous Fluids

Kim

Cho

Baek

et al. 2022

Small

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The parallelization of multiple microfluidic droplet junctions has been successfully achieved so that the production throughput of the uniform microemulsions/particles has witnessed considerable progress. However, these advancements have been observed only in the case of a low viscous fluid (viscosity of 10−2–10−3 Pa s). This study designs and fabricates a microfluidic device, enabling a uniform micro‐emulsification of an ultraviscous fluid (viscosity of 3.5 Pa s) with a throughput of ≈330 000 droplets per hour. Multiple T‐junctions of a dispersed oil phase, split from a single inlet, are connected into the single post‐crossflow channel of a continuous water phase. In the proposed device, the continuous water phase undergoes a series circuit, wherein the resistances are continuously accumulated. The independent corrugations of the dispersed oil phase channel, under the theoretical guidance, compromise such increased resistances; the ratio of water to oil flow rates at each junction becomes consistent across T‐junctions. Owing to the design being based on a fully 2D interconnection, single‐step soft lithography is sufficient for developing the full device. This easy‐to‐craft architecture contrasts with the previous approach, wherein complicated 3D interconnections of the multiple junctions are involved, thereby facilitating the rapid uptake of high throughput droplet microfluidics for experts and newcomers alike.

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“…Microwave irradiation has the potential to decrease the amount of carbonaceous materials required for eco-friendly chemistry owing to its specific characteristics such as non-thermal effect (catalytic effect) 1 – 4 , volumetric heating, rapid and selective heating 3 and high-efficiency heating 5 . For example, the theoretical carbon consumption in conventional heating such as blast furnace is ~380 kg per t of pig iron production, where ~230 kg is used for iron oxide reduction, and the remainder (150 kg) is used for heating and preparing the reaction energy 6 .…”

Section: Introductionmentioning

confidence: 99%

Effect of the Ratio of Magnetite Particle Size to Microwave Penetration Depth on Reduction Reaction Behaviour by H2

Amini

Ohno

Maeda

et al. 2018

Sci Rep

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In this study, we investigated reduction of magnetite by H2 during microwave irradiation. This process combines the advantages of microwave irradiation and using H2 as a reducing agent to mitigate CO2 emissions during the ironmaking process. Weight change measurements showed that a reduction of 75% was achieved after treatment under H2 for 60 min. For better understanding of the effective parameters in microwave chemistry, scanning electron microscopy, combined with energy-dispersive X-ray spectroscopy (SEM-EDX), was performed, which demonstrated a greater reduction of large particles (>40 μm) than small particles. This behaviour could be attributed to the higher microwave absorption capability of large particles with a higher ratio of particle size to penetration depth (d/δ). Small particles behave as transparent material and are heated via conduction and/or convection; thus, there is no contribution from the catalytic effect of microwaves to the reduction reaction. Moreover, the reduction of Fe3O4 to Fe0.94O, followed by transformation to Fe, seems to proceed from the surface toward the centre of the particle despite the volumetric microwave heating. This could be due to the higher gas accessibility of iron oxide on the particle surface than in the particle centre.

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The effect of electric field intensification at interparticle contacts in microwave sintering

Cited by 27 publications

References 35 publications

Flash sintering of ceramics

Flash sintering of ceramics

Parallelization of Microfluidic Droplet Junctions for Ultraviscous Fluids

Effect of the Ratio of Magnetite Particle Size to Microwave Penetration Depth on Reduction Reaction Behaviour by H2

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