Synthesis of mono-dispersed nanofluids using solution plasma

Heo, YongKang; Bratescu, Maria Antoaneta; Ueno, Tomonaga; Saito, Nagahiro

doi:10.1063/1.4887806

Cited by 29 publications

(34 citation statements)

References 32 publications

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“…Several types of liquid-phase plasma, e.g., streamer, spark, arc, and glow discharge plasmas, and their various formation methods have been reported11121314. We have already demonstrated a spark–glow transition plasma in aqueous solution and have used it to fabricate gold nanoparticles in the absence of a reducing agent15161718192021222324. This plasma is named solution plasma.…”

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confidence: 99%

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Morishita

Ueno

Panomsuwan

et al. 2016

Sci Rep

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Although solution-plasma processing enables room-temperature synthesis of nanocarbons, the underlying mechanisms are not well understood. We investigated the routes of solution-plasma-induced nanocarbon formation from hexane, hexadecane, cyclohexane, and benzene. The synthesis rate from benzene was the highest. However, the nanocarbons from linear molecules were more crystalline than those from ring molecules. Linear molecules decomposed into shorter olefins, whereas ring molecules were reconstructed in the plasma. In the saturated ring molecules, C–H dissociation proceeded, followed by conversion into unsaturated ring molecules. However, unsaturated ring molecules were directly polymerized through cation radicals, such as benzene radical cation, and were converted into two- and three-ring molecules at the plasma–solution interface. The nanocarbons from linear molecules were synthesized in plasma from small molecules such as C2 under heat; the obtained products were the same as those obtained via pyrolysis synthesis. Conversely, the nanocarbons obtained from ring molecules were directly synthesized through an intermediate, such as benzene radical cation, at the interface between plasma and solution, resulting in the same products as those obtained via polymerization. These two different reaction fields provide a reasonable explanation for the fastest synthesis rate observed in the case of benzene.

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confidence: 99%

Fastest Formation Routes of Nanocarbons in Solution Plasma Processes

Morishita

Ueno

Panomsuwan

et al. 2016

Sci Rep

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“…The conventional circuit consists of a bipolar pulsed power supply and pin‐to‐pin discharge device, as shown in Figure (a) and Supplementary Information Figure S1 . The modified circuit consists of a low‐pass filter part, denoted as the oscillation filter part, with a parallel capacitor of 2 nF and a resistor of 50 Ω and discharge device part with the addition of a resistor of 100 Ω in series, as shown in Figure (b).…”

Section: Methodsmentioning

confidence: 99%

“…In the discharge of liquids, plasma can be produced starting from a liquid where different solid compounds can be dissolved, or various gases can be introduced. In this plasma, gases, liquids, and solid compounds can be processed, and new possibilities for material synthesis are open . The electrode material can be combined with the species from the liquid phase to produce new materials with new properties …”

Section: Introductionmentioning

confidence: 99%

Generation of non‐equilibrium condition in solution plasma discharge using low‐pass filter circuit

Heo

Lee

Bratescu

et al. 2016

Plasma Processes & Polymers

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Solution plasma process has been researched as one of the synthetic methods of nano‐ and functional materials using plasma discharge in liquids. In this study, a low‐pass filter circuit was introduced to increase the density and temperature of electrons involved in a non‐equilibrium condition. The discharge properties of the solution plasma generated by conventional and low‐pass filter circuits were characterized and comparatively analyzed. Filtration of the MHz range current oscillations, an increase in the maximum discharge current, and a higher stability of solution plasma were obtained by simply inserting a resistor‐capacitor (RC) component in the circuit, which leads to the increases in the density and temperature of electrons.

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“…Solution Plasma (SP), a non-equilibrium discharge in liquids at atmospheric pressure and room temperature, has emerged as a useful synthetic method for various nanomaterials such as nanoparticles, [35][36][37] nanocarbons, 38 heterogeneous nanocarbons, [39][40][41] and transition metal-carbon composites. 40 Among these nanomaterials, the most interesting achievement is the formation of heterogeneous nanocarbons.…”

Section: Introductionmentioning

confidence: 99%