Synthesis of Nanoscale Metal Oxide Particles Using Laser Vaporization/Condensation in a Diffusion Cloud Chamber

El‐Shall, M. Samy; Slack, W.; Vann, W. D.; Kane, David B.; Hanley, D.

doi:10.1021/j100063a001

Cited by 111 publications

(45 citation statements)

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“…The production rate varies with helium gas pressure and laser pulse energy [93]. Several workers then employed the laser ablation and gas condensation to produce nanoparticles of metals, metal oxides and metal carbides [94][95][96][97][98][99].…”

Section: Physical Vapor Depositionmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

832

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Section: Physical Vapor Depositionmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

832

345

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“…[8] A novel method, which combines laser vaporization of metals with controlled condensation in a diffusion cloud chamber, is used to synthesize nanoscale MgO nanoparticles of homogeneous size and well-defined composition. [9] Nanocrystalline Mg(OH) 2 has been synthesized by a hydrothermal reaction using different magnesium precursors and solvents as the reactants. Subsequent thermal decomposition at 450 C gave nanometer-sized MgO.…”

Section: Introductionmentioning

confidence: 99%

Microwave‐Assisted Synthesis of Nanocrystalline MgO and Its Use as a Bacteriocide

Makhluf

Dror

Nitzan

et al. 2005

Adv Funct Materials

519

293

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Nanocrystalline particles of MgO were synthesized using microwave radiation in an ethylene glycol solution. The antibacterial activities of the MgO nanoparticles were tested by treating Escherichia coli (Gram negative) and Staphylococcus aureus (Gram positive) cultures with 1 mg mL–1 of the nanoparticles. We have examined the importance of the size effect, pH, and the form of the active MgO species as a bactericidal agent. A clear size dependence of the nanoparticles is observed where the amount of eradicated bacteria was strongly dependent on the particle size.

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“…1-Chloro-1,2-difluoro-2-methoxy-ethene is the further decomposed to yield carbon particles, and possibly some organic small molecules (2) and hydrogen fluoride, hydrogen chloride and water in the vapor or supercritical state (3). From the vapor phase, carbon-nucleating particles are condensed (4). Depending on the specific experimental conditions prevailing, either a protective carbon film is formed in the capillary (5), or the particles diffuse and adsorb onto the capillary wall at a (suitable) particle density (6).…”

Section: Growth Mechanism Of the Nanowiresmentioning

confidence: 99%

“…Nano-structured silica has a vast number of possible applications, e.g., in micro-electronics, microfluidics, optics, biosensors as well as in particle technology. Often, the methodology used in synthesizing nanostructured silica entities requires advanced instrumentation, such as excimer laser ablation technology [4][5][6] or complex templateassisted polymerizations/condensations [7][8][9][10][11]. Also attempts to mimic biosilicification have been performed [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Nanowires for surface enlargement of narrow‐bore fused‐silica tubing

Woldegiorgis¹,

Jansson²,

Curcio³

et al. 2004

Electrophoresis

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A method for preparation of silica nanowires with dimensions of d = 10-100 nm, l = 5-500 nm, is described. The nanostructured material is an integral part of the inner surface of narrow bore fused-silica capillary tubing. The wire preparation method is based on a decomposition of 2-chloro-1,1,2-trifluoroethyl methyl ether at elevated temperature and pressure. The silica bulk material is rearranged via a sustained silica-hydrogen fluoride chemistry, and reaction mechanisms for this process are proposed. The method is suitable for preparing long lengths of tubing with the modified surface. It is our belief that the texture of the capillary wall with its increased surface area is useful for applications such as microreactions, catalysis, and high-resolution pressure and/or electrodriven open-tubular liquid chromatography.

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Synthesis of Nanoscale Metal Oxide Particles Using Laser Vaporization/Condensation in a Diffusion Cloud Chamber

Cited by 111 publications

References 0 publications

Nanocrystalline materials and coatings

Nanocrystalline materials and coatings

Microwave‐Assisted Synthesis of Nanocrystalline MgO and Its Use as a Bacteriocide

Nanowires for surface enlargement of narrow‐bore fused‐silica tubing

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