New developments in spark production of nanoparticles

Pfeiffer, Tobias; Feng, Jicheng; Schmidt‐Ott, A.

doi:10.1016/j.apt.2013.12.005

Cited by 143 publications

(151 citation statements)

References 45 publications

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“…In this respect, the synthesis and the growth of controlled antimicrobial coating with bi-NPs in a single step are an open challenge. A feasible alternative to directly synthesize and deposit controlled nano-structured multielemental coatings is based on gas-phase synthesis techniques, [21][22][23] and in particular Supersonic Cluster Beam Deposition (SCBD). 22,23 Here, the synthesized NPs form a beam that allows the direct deposition of the coating on the substrate.…”

confidence: 99%

Direct synthesis of antimicrobial coatings based on tailored bi-elemental nanoparticles

et al. 2017

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Ultrathin coatings based on bi-elemental nanoparticles (NPs) are very promising to limit the surface-related spread of bacterial pathogens, particularly in nosocomial environments. However, tailoring the synthesis, composition, adhesion to substrate, and antimicrobial spectrum of the coating is an open challenge. Herein, we report on a radically new nanostructured coating, obtained by a one-step gas-phase deposition technique, and composed of bi-elemental Janus type Ag/Ti NPs. The NPs are characterized by a cluster-in-cluster mixing phase with metallic Ag nano-crystals embedded in amorphous TiO2 and present a promising antimicrobial activity including also multidrug resistant strains. We demonstrate the flexibility of the method to tune the embedded Ag nano-crystals dimension, the total relative composition of the coating, and the substrate type, opening the possibility of tailoring the dimension, composition, antimicrobial spectrum, and other physical/chemical properties of such multi-elemental systems. This work is expected to significantly spread the range of applications of NPs coatings, not only as an effective tool in the prevention of healthcare-associated infections but also in other technologically relevant fields like sensors or nano-/micro joining

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confidence: 99%

Direct synthesis of antimicrobial coatings based on tailored bi-elemental nanoparticles

et al. 2017

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“…Recently, the application of spark discharges for NP production has been steadily increasing, as it was realized that SDGs provide an exceptionally versatile, clean, and efficient method of NP production. Major contributions to the advancement of the field came from Schmidt-Ott, 1 as well as from Hwang, 2 Deppert, 3 and Kruis. 4 The most recent review of the area was published in Ref.…”

Section: Introductionmentioning

confidence: 99%

“…4 The most recent review of the area was published in Ref. 1. It is also worth mentioning that pulsed or condensed arc discharges can also be used to generate nanomaterials.…”

Section: Introductionmentioning

confidence: 99%

A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

Palomares

Kohut

Galbács

et al. 2015

Journal of Applied Physics

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A time-resolved laser induced fluorescence study on the ion velocity distribution function in a Hall thruster after a fast current disruption Phys. Plasmas 16, 043504 (2009) We present a time-resolved imaging and electrical study of an atmospheric pressure spark discharge. The conditions of the present study are those used for nanoparticle generation in spark discharge generator setups. The oscillatory bipolar spark discharge was generated between two identical Cu electrodes in different configurations (cylindrical flat-end or tipped-end geometries, electrode gap from 0.5 to 4 mm), in a controlled co-axial N 2 flow, and was supplied by a high voltage capacitor. Imaging data with nanosecond time resolution were collected using an intensified CCD camera. This data were used to study the time evolution of plasma morphology, total light emission intensity, and the rate of plasma expansion. High voltage and high current probes were employed to collect electrical data about the discharge. The electrical data recorded allowed, among others, the calculation of the equivalent resistance and inductance of the circuit, estimations for the energy dissipated in the spark gap. By combining imaging and electrical data, observations could be made about the correlation of the evolution of total emitted light and the dissipated power. It was also observed that the distribution of light emission of the plasma in the spark gap is uneven, as it exhibits a "hot spot" with an oscillating position in the axial direction, in correlation with the high voltage waveform. The initial expansion rate of the cylindrical plasma front was found to be supersonic; thus, the discharge releases a strong shockwave. Finally, the results on equivalent resistance and channel expansion are comparable to those of unipolar arcs. This shows the spark discharge has a similar behavior to the arc regime during the conductive phase and until the current oscillations stop. V C 2015 AIP Publishing LLC. [http://dx

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“…It has been found that two types of electrical discharges, namely spark discharge and arc discharge, are most suitable for that aim. A newly developed electrical circuit enables the reach of spark frequencies of up to 20 kHz, resulting in production rates higher by a factor of 10 2 -10 3 than those achieved by using low frequency spark discharge (<1 kHz), while keeping the primary particle size below 10 nm [2]. Also, the latest advancements in transferred arc nanoparticle synthesis allow for achieving production rates of a few grams per hour with adjustable primary particle size, in general, above 50 nm [3,4].…”

Section: Introductionmentioning

confidence: 99%

Influence of the inter-electrode distance on the production of nanoparticles by means of atmospheric pressure inert gas dc glow discharge

Hontañón

Palomares

Guo

et al. 2014

J. Phys. D: Appl. Phys.

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Hontanõn, E.; Palomares Linares, J.M.; Guo, C.; Engeln, R.A.H.; Nirschi, H.; Kruis, F. Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Hontanõn, E., Palomares Linares, J. M., Guo, C., Engeln, R. A. H., Nirschi, H., & Kruis, F. (2014). Influence of the interelectrode distance on the production of nanoparticles by means of atmospheric pressure inert gas DC glow discharge. Journal of Physics D: Applied Physics, 47, 415201-1/12. DOI: 10.1088/0022-3727/47/41/415201 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. AbstractThis work is aimed at investigating the influence of the inter-electrode spacing on the production rate and size of nanoparticles generated by evaporating a cathode on an atmospheric pressure dc glow discharge. Experiments are conducted in the configuration of two vertically aligned cylindrical electrodes in upward coaxial flow with copper as a consumable cathode and nitrogen as a carrier gas. A constant current of 0.5 A is delivered to the electrodes and the inter-electrode distance spanned from 0.5 to 10 mm. Continuous stable nanoparticle production is attained by optimal coaxial flow convection cooling of the cathode. Both the particle production rate and the primary particle size increase with the inter-electrode spacing up to nearly 5 mm and strongly decrease with an increasing inter-electrode distance beyond 5 mm. Production rates in the range of 1 mg h −1 of very small nanoparticles (<10 nm) are attained by a micro glow discharge (<1 mm); while glow discharges of intermediate sizes (<5 mm) result in production rates ...

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New developments in spark production of nanoparticles

Cited by 143 publications

References 45 publications

Direct synthesis of antimicrobial coatings based on tailored bi-elemental nanoparticles

Direct synthesis of antimicrobial coatings based on tailored bi-elemental nanoparticles

A time-resolved imaging and electrical study on a high current atmospheric pressure spark discharge

Influence of the inter-electrode distance on the production of nanoparticles by means of atmospheric pressure inert gas dc glow discharge

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