Vapor-phase production of nanomaterials

Malekzadeh, Mohammad; Swihart, Mark T.

doi:10.1039/d0cs01212b

Cited by 40 publications

(14 citation statements)

References 804 publications

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“…The formation of agglomerates during VPS is typical due to the high process temperature and absence of surfactants. − Agglomerated particles are preferred in applications, such as catalysts and sensors, because they have a large surface area . However, such particles are undesirable for use in MLCC electrodes, as they cause various problems such as low packing density and electric shorts.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapor Synthesis of Nonagglomerated Nickel Nanoparticles by In-Flight Coating

Lee

Park

et al. 2021

ACS Omega

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Nickel (Ni) nanoparticles (NPs) prepared through vapor-phase synthesis (VPS) are preferred for multilayer ceramic capacitor electrodes due to their high purity and crystallinity advantages. Agglomerated Ni NPs are usually generated using VPS but are undesirable because they cause various problems such as low packing density and electrical shorts. This study proposes the use of coating-assisted chemical vapor synthesis (CVS) for agglomerate inhibition using NaCl or KCl as a coating agent. We have found that the agglomeration ratio, 34.40%, for conventional CVS, can be reduced to 4.80% in the proposed method by in-flight coating with KCl at 900 °C by image analysis using field-emission scanning electron microscopy. Furthermore, the X-ray diffraction and X-ray fluorescence analyses confirm that the NaCl and KCl coating agent can be removed by washing with distilled water. We believe that this coating process can be used to inhibit the formation of agglomerates during the CVS of Ni NPs.

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Section: Introductionmentioning

confidence: 99%

Chemical Vapor Synthesis of Nonagglomerated Nickel Nanoparticles by In-Flight Coating

Lee

Park

et al. 2021

ACS Omega

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“…However, this approach often encounters barriers to commercial implementation due to time-consuming batch processing and undesirable variations of physicochemical properties upon scale-up. [15][16][17] Flame aerosol processing, the most common method for industrial production of low-cost nanomaterials (e.g. carbon black and fumed silica), has attracted broad interest for preparing advanced nanomaterials over the past twenty years.…”

Section: Introductionmentioning

confidence: 99%

A General Route to Flame Aerosol Synthesis and In Situ Functionalization of Mesoporous Silica

et al. 2022

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Mesoporous silica is a versatile material for use in catalysis and adsorption in energy, environmental, and medical applications. Here, for the first time, we report a flame aerosol synthesis method for a class of mesoporous silica materials with hollow, amorphous structure, low density, and specific surface area exceeding 1000 m 2 /g. We show its superior performance vs. MCM-41 in properties relevant to water purification, drug carrier, and thermal insulation applications. Moreover, we produced several types of mesoporous silica-supported nano-catalysts by in situ incorporation of active metals. The generality of this method is demonstrated by decorating mesoporous supports with noble metal, transition metal, and metal oxide nanoclusters, including Pt/SiO 2 , Ni/SiO 2 , CrO 3 /SiO 2 , and Co/Al 2 O 3 . As a prototypical application, we demonstrate dry reforming of methane using Ni/SiO 2 , achieving constant 97% CH 4 and CO 2 conversions for more than 200 hours, dramatically outperforming a corresponding MCM-41 supported Ni catalyst. Thus, this work provides a continuous and scalable strategy to produce mesoporous silica nanoshells, and the proposed in situ functionalization mechanism may pave the way to flexible catalysts for a diverse range of reactions.

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“…However, a large number of agglomerated particles are generated by the active collision between particles, which are undesirable for MLCC electrodes because of several factors, including electrical shorts and low packing density. However, inhibiting the formation of agglomerates [14][15][16] is difficult in VPS because surfactants cannot be used in this method owing to the high process temperature. Therefore, Cu NPs prepared by VPS must undergo a classication process, resulting in a low yield.…”

Section: Introductionmentioning

confidence: 99%

Pure copper nanoparticles prepared by coating-assisted vapor phase synthesis without agglomeration

Park

Jin

et al. 2022

RSC Adv.

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Vapor-phase production of nanomaterials

Abstract: This review comprehensively treats aerosol synthesis of nanomaterials, highlighting advantages and disadvantages of different approaches with examples of materials produced.

Cited by 40 publications

References 804 publications

Chemical Vapor Synthesis of Nonagglomerated Nickel Nanoparticles by In-Flight Coating

Chemical Vapor Synthesis of Nonagglomerated Nickel Nanoparticles by In-Flight Coating

A General Route to Flame Aerosol Synthesis and In Situ Functionalization of Mesoporous Silica

Pure copper nanoparticles prepared by coating-assisted vapor phase synthesis without agglomeration

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