Microwave-induced electric discharges on metal particles for the synthesis of inorganic nanomaterials under solvent-free conditions

Tripathi, Vijay; Kumar, Harit; Agarwal, Anubhav; Panchakarla, Leela S.

doi:10.3762/bjnano.11.86

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…For the nanocomposite synthesized at 200 W, the reaction mixture in the vial is black at 0:00 min due to the presence of the Ag‐NPs. The melting of the monomer starts at 0:37 min, and at 1:17 min, sparks begin to form in the liquid caused by the heat generated by the Ag‐NPs ionizing the reaction medium 44 . Then, between 1:22 and 1:34 min, and an interval temperature of 124–151°C, the reaction mixture changes its appearance from black to white/translucent, followed by the precipitation of a very large agglomerate at minute 9:37.…”

Section: Resultsmentioning

confidence: 99%

Microwave dielectric heating affects the in‐situ polymerization process of Nylon‐6/Ag‐NPs hybrid polymer nanocomposite

Mendoza-Tolentino¹,

Romero-Zúñiga

Reyes³

et al. 2023

J of Applied Polymer Sci

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In this work, the microwave synthesis of Nylon-6 hybrid polymeric nanocomposite (HPNC) was studied by the polymerization of ε-caprolactam, 6-aminocaproic acid, and 2% wt of silver nanoparticles (Ag-NPs). It was determined that the dielectric heating (DH) of the Ag-NPs controls the thermal behavior of the HPNCs synthesis and triggers the chemical reaction between Ag-NPs and the Nylon-6 molecules. Such reaction promotes their coating with the polymer and their precipitation, which affects the agitation of the reaction mixture, and results in broader molecular weight distribution and three HPNC populations. Usually, the power output effect in these processes is thermal as it accelerates their heating rate. Still, for HPNCs, higher output reduces the agglomerate size of the Ag-NPs and accelerates their precipitation. At power up to 600 W, the DH of the Ag-NPs causes the explosion of the reaction vials.The antimicrobial activity of the HPNCs against P. aeruginosa is almost 100% effective at 180 min of exposure; therefore, this microwave synthesis process is suitable for producing antimicrobial HPNCs.

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Section: Resultsmentioning

confidence: 99%

Microwave dielectric heating affects the in‐situ polymerization process of Nylon‐6/Ag‐NPs hybrid polymer nanocomposite

Mendoza-Tolentino¹,

Romero-Zúñiga

Reyes³

et al. 2023

J of Applied Polymer Sci

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“…Recently, physical properties such as monodispersity and grain size of superparamagnetic magnetite NPs prepared by microwave-assisted synthesis were controlled by the injection of humate-polyanion at different stages of the synthesis [ 121 ]. Microwave-induced electric discharge was used also for the synthesis of Cu, Ni, und Zn nanoparticles from metal particles in the absence of solvents or surfactants [ 122 ].…”

Section: Current Trends In Nmnps Synthesismentioning

confidence: 99%

Current Strategies for Noble Metal Nanoparticle Synthesis

2021

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Noble metals have played an integral part in human history for centuries; however, their integration with recent advances in nanotechnology and material sciences have provided new research opportunities in both academia and industry, which has resulted in a new array of advanced applications, including medical ones. Noble metal nanoparticles (NMNPs) have been of great importance in the field of biomedicine over the past few decades due to their importance in personalized healthcare and diagnostics. In particular, platinum, gold and silver nanoparticles have achieved the most dominant spot in the list, thanks to a very diverse range of industrial applications, including biomedical ones such as antimicrobial and antiviral agents, diagnostics, drug carriers and imaging probes. In particular, their superior resistance to extreme conditions of corrosion and oxidation is highly appreciated. Notably, in the past two decades there has been a tremendous advancement in the development of new strategies of more cost-effective and robust NMNP synthesis methods that provide materials with highly tunable physicochemical, optical and thermal properties, and biochemical functionalities. As a result, new advanced hybrid NMNPs with polymer, graphene, carbon nanotubes, quantum dots and core–shell systems have been developed with even more enhanced physicochemical characteristics that has led to exceptional diagnostic and therapeutic applications. In this review, we aim to summarize current advances in the synthesis of NMNPs (Au, Ag and Pt).

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“…Recently, the microwave discharge method that applies the discharge effect of the conductor to fabricate metal/carbon composites under a microwave environment has drawn increasing attention. , Under microwave radiation, the free electrons on the surface of the conductor will move toward the tip and edge by the electromagnetic field. When the electrons accumulate to a certain degree, they will break away from the conductor and produce the discharge phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Loading Pt/C Electrocatalysts Using a Surfactant-Assisted Microwave Discharge Method for Oxygen Reduction Reactions

Sun

Zhou

et al. 2022

ACS Appl. Mater. Interfaces

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High-loading Pt/C catalysts play an important role in the practical application of metal–air batteries and fuel cells because of their superior activity, high conductivity, and commercial availability. It is well known that high loadings always lead to the agglomeration of Pt nanoparticles, resulting in a loss of catalytic activity and stability; thus, it still remains a challenge to prepare high-loading Pt/C catalysts with high dispersion and small particle sizes. Here, we introduce a surfactant-assisted microwave discharge method to prepare high-loading (>40 wt %) Pt/C electrocatalysts with ultrafine particle sizes (∼3.19 nm) and good dispersion. Benefitting from the high-temperature property and reducibility of carbon-induced-arc, the surfactant and Pt precursors undergo rapid decomposition, reduction, and carbonization, generating the structure of Pt@C on carbon black. The carbon derived from the surfactant can not only inhibit the agglomeration of Pt nanoparticles but also prevent the Pt core from toxication, ensuring high activity and stability of the high-loading Pt/C catalyst. When evaluated in the oxygen reduction reaction, the as-prepared Pt/C catalyst demonstrates a comparable activity and better methanol resistance to commercial Pt/C.

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Microwave-induced electric discharges on metal particles for the synthesis of inorganic nanomaterials under solvent-free conditions

Cited by 10 publications

References 21 publications

Microwave dielectric heating affects the in‐situ polymerization process of Nylon‐6/Ag‐NPs hybrid polymer nanocomposite

Microwave dielectric heating affects the in‐situ polymerization process of Nylon‐6/Ag‐NPs hybrid polymer nanocomposite

Current Strategies for Noble Metal Nanoparticle Synthesis

Synthesis of High-Loading Pt/C Electrocatalysts Using a Surfactant-Assisted Microwave Discharge Method for Oxygen Reduction Reactions

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