Synthesis of Functional Oxide Nanoparticles Through RF Thermal Plasma Processing

Ishigaki, Takamasa

doi:10.1007/s11090-017-9788-8

Cited by 20 publications

(7 citation statements)

References 65 publications

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“…no anatase/rutile composite particle was observed, and that particles consist of single or a few grains. The observed condition reflects the homogeneous nucleation from a vapour phase to form particles of individual phases, as reported in the vapour phase synthesis of TiO 2 nano-size particles via thermal plasma processing, which involves a plasma flame of tremendously high temperature, greater than 10 000 K. Nucleation from a vapour phase and the particle growth take place in the plasma tail region [23]. High-resolution images (figure 4e) taken on the square area in figure 4b shows the stack of single-crystal anatase and rutile particles, i.e.…”

Section: Grain Growth and Phase Transformationsupporting

confidence: 67%

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

et al. 2020

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Nano-size EVONIK AEROXIDE ® P25 titanium dioxide, TiO 2 , powder was heat-treated at temperatures, 700–900°C, in air. An X-ray diffraction study showed that the P25 powder is composed of approximately 20 and approximately 80 mass% of rutile and anatase phases, respectively. It was also shown that the transformation from anatase to rutile induced by high-temperature heat treatment was almost completed at 750°C, whereas a small amount (less than 3 mass%) of anatase phase was still left even in the powder heat-treated at 900°C. The transformation behaviour was consistent with results obtained by Raman scattering spectroscopy. Raman experiments also indicated that high-temperature heating induced the formation of oxide ion vacancies. Powders were dispersed in methyl orange (MO) aqueous solution, and the bleach rate of MO was measured to evaluate photocatalytic activity under ultraviolet (UV)- and visible-light irradiation. After the heat treatment, the UV-light photocatalytic performance sharply deteriorated. Interestingly, visible-light photocatalytic activity was enhanced by high-temperature heating and reached the highest performance for an 800°C-heated sample, indicating that the P25 powder obtained high visible-light photocatalytic performance after heat treatment. Even after 900°C heat treatment, the photocatalytic performance was higher than that of as-received powder. Enhancement of photocatalytic activities was discussed in relation to visible light absorption and charge carrier transfer.

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Section: Grain Growth and Phase Transformationsupporting

confidence: 67%

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

et al. 2020

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“…A large number of publications, including a set of our previous papers, pointed out that due to its unique properties, thermal plasma processes offer an appealing route for preparing nanosized oxide, nitride, carbide and boride ceramic nanopowders [20][21][22][23][24][25][26]. Thermal plasmas possess extremely high temperatures (up to 15,000 K in the flame), large plasma volume, high enthalpy and high concentrations of chemically reactive species, enhancing the reactivity of the precursors injected in the plasmas [27][28][29]. Besides, the typically fast cooling rate (10 4 Ks -1 ) inhibits grain growth of the small molecular clusters thus promotes the formation of nanopowder.…”

Section: Introductionmentioning

confidence: 99%

In-flight Synthesis of Nanosized ZrC Particles from Various Precursors in RF Thermal Plasma

Martiz

Károly

Bódis

et al. 2021

Period. Polytech. Chem. Eng.

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Synthesis of zirconium carbide (ZrC) powder was investigated applying a non-conventional atmospheric radiofrequency (RF) thermal plasma process. In one case, zirconium dioxide (ZrO2) was reacted with solid carbon or with methane with varying molar ratio. In the other, zirconium-propoxide (NZP), containing both constituents, was thermally decomposed in the Ar plasma. Temperature-dependent thermodynamic analysis was performed in the 500-5500 K temperature range to estimate the formation of possible equilibrium products for each reaction stoichiometry. Broad temperature range exists for the stability of solid ZrC for each explored reaction system. In accordance with this prediction, X-ray diffraction studies detected the ZrC as the major phase in all the prepared powders. The yield of particular runs ranged from 39 % to 98 %. Practically, full conversion was typical for the case of NZP precursor, however only partial conversion could be detected in ZrO2 reactions. The average particle size of the powders falls between 10 nm and 100 nm depending on the type of the reaction systems (either calculated from the specific surface area or derived from broadening the XRD reflections). The transmission electron micrographs indicated mostly globular shape of the nanosize particles. Quantitative analysis of the surface of the powders by X-ray photoelectron spectroscopy revealed the presence of oxygen and carbon. Evaluating the spectra of the powders prepared from NZP, and taking in the account its spherical shape, a ZrC core covered by a very thin (≈1.0 nm) ZrO2 layer may be accounted for the measured oxygen and a thicker carbonaceous layer.

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“…The use of chitosan as a carrier for curcumin has been suggested to improve its water solubility and, as a result, its oral bioavailability. Furthermore, curcumin can also lower oxidative stress and regulate the expression of genes linked to oxidative stress and inflammatory responses [19]. Thus, because of its low toxicity, few side effects, and general availability to a huge number of individuals, it is widely used to treat a variety of disorders.…”

Section: Curcuminmentioning

confidence: 99%

Curcumin Extract Loaded with Chitosan Nanocomposite for Cancer Treatment

Zulkifli

Yusefi

Shameli

2022

JRNN

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Cancer has become the root of problems in this era especially during this modern medicine time and because of that anticancer treatment had been developed to cure the patient suffering from this disease and for that an adoption of curcumin extract becomes a great deal of interest because of its anticancer properties. A recent study had been done aimed at determining the potential anticancer properties by chitosan in nanoparticle form. Furthermore, curcumin's weak water solubility enables it to accumulate in high concentrations, lowering its permeability to the cell. Curcumin is reduced via a variety of methods. With improving medicinal and research capabilities, nowadays the nano-pharmaceutics became an important field of science to develop an improve efficacy of different drugs specifically that target cancer diseases. In the present review, we focus on the plant extract of curcumin from Curcuma Longa plant and chitosan which derived from chitin in the exoskeletons of crustaceans which then be encapsulated into a nanocarrier formulation that can overcome this cancer. Thus, curcumin's potential preventative and therapeutic applications, as well as several forms of bio-nanocarriers that can be employed to effectively deliver curcumin to various target areas, will be reviewed.

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Synthesis of Functional Oxide Nanoparticles Through RF Thermal Plasma Processing

Cited by 20 publications

References 65 publications

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

Enhanced visible-light photocatalytic activity of anatase-rutile mixed-phase nano-size powder given by high-temperature heat treatment

In-flight Synthesis of Nanosized ZrC Particles from Various Precursors in RF Thermal Plasma

Curcumin Extract Loaded with Chitosan Nanocomposite for Cancer Treatment

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