Gold particle generation by spray pyrolysis

Majumdar, Diptarka; Kodas, Toivo T.; Glicksman, H. D.

doi:10.1002/adma.19960081219

Cited by 20 publications

(11 citation statements)

References 16 publications

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“…A number of examples of metals and their alloys (e.g., Ag, [145] Pd, [146] Au, [147] Cu, [148] Ni, [149] Co, [150] and Ag-Pd [151] ) production have been reported. Typical syntheses to produce metal or alloy particles involve a simple decomposition of aqueous metal salt (typically nitrate) solutions under an inert gas flow (e.g., N 2 or Ar).…”

Section: Preparation Of Fine Powders and Filmsmentioning

confidence: 98%

Applications of Ultrasound to the Synthesis of Nanostructured Materials

2010

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Recent advances in nanostructured materials have been led by the development of new synthetic methods that provide control over size, morphology, and nano/microstructure. The utilization of high intensity ultrasound offers a facile, versatile synthetic tool for nanostructured materials that are often unavailable by conventional methods. The primary physical phenomena associated with ultrasound that are relevant to materials synthesis are cavitation and nebulization. Acoustic cavitation (the formation, growth, and implosive collapse of bubbles in a liquid) creates extreme conditions inside the collapsing bubble and serves as the origin of most sonochemical phenomena in liquids or liquid-solid slurries. Nebulization (the creation of mist from ultrasound passing through a liquid and impinging on a liquid-gas interface) is the basis for ultrasonic spray pyrolysis (USP) with subsequent reactions occurring in the heated droplets of the mist. In both cases, we have examples of phase-separated attoliter microreactors: for sonochemistry, it is a hot gas inside bubbles isolated from one another in a liquid, while for USP it is hot droplets isolated from one another in a gas. Cavitation-induced sonochemistry provides a unique interaction between energy and matter, with hot spots inside the bubbles of approximately 5000 K, pressures of approximately 1000 bar, heating and cooling rates of >10(10) K s(-1); these extraordinary conditions permit access to a range of chemical reaction space normally not accessible, which allows for the synthesis of a wide variety of unusual nanostructured materials. Complementary to cavitational chemistry, the microdroplet reactors created by USP facilitate the formation of a wide range of nanocomposites. In this review, we summarize the fundamental principles of both synthetic methods and recent development in the applications of ultrasound in nanostructured materials synthesis.

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Section: Preparation Of Fine Powders and Filmsmentioning

confidence: 98%

Applications of Ultrasound to the Synthesis of Nanostructured Materials

2010

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“…The XRD pattern of the precipitate showed that it was well-crystallized Ni(HCOO) 2 ⅐2H 2 O. ‡ Clearly, NO 3 Ϫ decomposed to gas species such as NO x , followed by the precipitation of Ni(HCOO) 2 from the solution. The similar vigorous processes can also occur within ‡ Powder Diffraction File, No.…”

Section: July 2001mentioning

confidence: 99%

“…Metals, metal oxides, and non-oxides can be readily produced by spray pyrolysis. [3][4][5] For electronic products such as multilayer ceramics and batteries, nickel is used for electrodes. 6 Because of its good performance and lower cost, compared with noble metals such as palladium and silver, nickel is replacing them and becoming one of the most important electrode materials.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nickel Powders by Spray Pyrolysis of Nickel Formate

Xia¹,

Lenggoro²,

Okuyama³

2001

Journal of the American Ceramic Society

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The preparation of nickel powders by the ultrasonic spray pyrolysis of Ni(HCOO) 2 was studied. Phase-pure nickel powder was obtained at as low as 350°C. HCOOH was a reducing source for nickel formation. Moreover, metallic nickel was obtained at a residence time as short as 0.1 s at 600°C. A broad range of particle morphologies, which included agglomerated nanoparticles, nonagglomerated submicrometer particles, hollow particles, and spherical dense particles, were obtained from Ni(HCOO) 2 pyrolysis and were shown to depend on the precursor solution and the operating condition.

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“…45 46 USP has been applied for the preparation of micronsized fine powders of ceramic materials, metals and metal alloys (e.g., Ag, 47 Au, 48 Cu, 49 Ag-Pd 50 . Frequently, to synthesize a metal or alloy particles a simple decomposition method is used where an aqueous metal salt (e.g., nitrate) solutions (under an inert gas flow) are employed as metal precursors.…”

Section: Preparation Of Films and Fine Powdersmentioning

confidence: 99%

Ultrasound and Photochemical Procedures for Nanocatalysts Preparation: Application in Photocatalytic Biomass Valorization

Colmenares¹

2013

j. nanosci. nanotech.

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Nano-photocatalysis is becoming increasingly important due to its multiple applications and multidisciplinary aspects. Applications such as water/air purification, solar energy storage, chemicals production and optoelectronics are some of the most promising. In recent years, the development of novel environmental friendly and cost efficient methods for materials preparation that could replace the old ones is on demand. Unconventional and "soft" techniques such as sonication and photochemistry offer huge possibilities for the synthesis of a broad spectrum of nanostructured materials (e.g., nano-photocatalysts). In the present study, I focus on ultrasound and photochemical procedures for the preparation of nanostructured photocatalysts (e.g., supported metals, metal oxides) and their application in food organic wastes valorization.

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Gold particle generation by spray pyrolysis

Abstract: 1020 0 VCH Verlagsgeselkhaft mbH, 0-69469 Weinheini, I996 0935-9648/96/

Cited by 20 publications

References 16 publications

Applications of Ultrasound to the Synthesis of Nanostructured Materials

Applications of Ultrasound to the Synthesis of Nanostructured Materials

Preparation of Nickel Powders by Spray Pyrolysis of Nickel Formate

Ultrasound and Photochemical Procedures for Nanocatalysts Preparation: Application in Photocatalytic Biomass Valorization

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