Synthesis of nano-sized Al doped TiO2 powders using thermal plasma

Lee, Ji Eun; Oh, Seung-Min; Park, Dong-Wha

doi:10.1016/j.tsf.2003.12.027

Cited by 90 publications

(59 citation statements)

References 18 publications

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“…Based on these results and weight measurements of the synthesized powder, the production rates of nanopowder were estimated as more than 400 g h −1 under g pow = 12 g min −1 condition (80%SCL and 70%SCL), for example, using the 20-kW PMITP. This production rate value is 10-20 times higher than those obtained using the conventional thermal plasma method reported in the literature [6,14]. This important benefit of our developed method, large-scale synthesis of nanopowder, must be emphasized.…”

Section: Sem Images and Particle Size Distribution Of Synthesized Powdermentioning

confidence: 67%

“…These powder feeding rates are much higher than those in other conventional nanoparticle synthesis methods described in the literature. They used induction thermal plasmas of several tens of kilowatts [6,14]. The feedstock was fed intermittently with a high-speed solenoid valve that was synchronized with the coil current modulation with delay time t d of 6 ms.…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…Several studies have examined the synthesis of TiO 2 nanoparticles using a steady-state type of inductively coupled thermal plasma (ICTP). They have mainly investigated control of its particle size and phase constituent [13,14,18]. However, some issues persist: the difficulty in controlling the synthesized particle size, and also the lower production rate from the instability of ICTP sustainability during heavy-load feeding of feedstock.…”

Section: Introductionmentioning

confidence: 99%

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A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Kodama¹,

Tanaka²,

Kita³

et al. 2014

J. Phys. D: Appl. Phys.

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Abstract.A unique large-scale synthesis method for Al-doped TiO 2 nanopowder was developed using 20-kW Ar-O 2 pulse-modulated induction thermal plasmas (PMITP) with time-controlled feedstock feeding (TCFF). This PMITP-TCFF method is characterized by intermittent feedstock powder feeding synchronized with modulated power of the PMITP. The method enables heavy-load feeding of raw material powder to the thermal plasmas for complete evaporation. Synthesized nanopowder was analyzed using different methods including FE-SEM, XRD, BF-TEM, TEM/EDX mapping, XPS, and spectrophotometry. Results showed that Al-doped TiO 2 nanopowder can be synthesized with mean diameters of 50-60 nm. The Al doping in TiO 2 was confirmed from the constituent structure in XRD spectra, the uniform presence of Al on the nanopowder in TEM/EDX mapping, the chemical shift in XPS spectra, and the absorption edge shift in the optical property. The production rate of Al-doped TiO 2 nanopowder was estimated as 400 g h −1 .

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Section: Sem Images and Particle Size Distribution Of Synthesized Powdermentioning

confidence: 67%

Section: Experimental Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Kodama¹,

Tanaka²,

Kita³

et al. 2014

J. Phys. D: Appl. Phys.

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“…Meanwhile, anatase type and rutile type TiO 2 , shown in Fig. 2, are a photocatalyst, and the photocatalysis has been carried out under ultraviolet light (UV) irradiation because of its high energy band gap (3.2 eV for anatase and 3.0 eV for rutile) [6]. The anatase type TiO 2 particles are commonly used as photocatalyst, since it is known that the anatase type TiO 2 shows more effective for photocatalytic reaction than rutile type.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of TiO<sub>2</sub> Coated Cotton-Yarn as High-Dielectric-Constant Fiber for 3-D Photonic Crystal Application

Furukawa

Sato

Watanabe

2012

Trans. Mat. Res. Soc. Japan

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Photonic crystal is a new type of optical material in which a refractive index or dielectric constant is periodically changed. It is easy to fabricate 3-D periodic structures using textile technology. The main goal of our study has been, therefore, to fabricate the flexible photonic crystals by using high-dielectric-constant fibrous material. For this purpose, in this study, the high-dielectric-constant fiber was fabricated by coating of TiO 2 particles onto the cotton-yarn by irradiation of ultraviolet light (UV), since the TiO 2 is a photocatalytic material.

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“…Recently, high-pressure high-power inductively coupled plasmas have become effective heat and chemical species sources for various materials processing such as syntheses of nanopowders [1][2][3][4] diamond films, 5 and thermal barrier coatings. 6 This has occurred because they can provide advantages of remarkably higher enthalpy and higher radical density than cold plasmas.…”

mentioning

confidence: 99%

Generation of high-power arbitrary-wave-form modulated inductively coupled plasmas for materials processing

Tanaka

Morishita

Fushie

et al. 2007

Applied Physics Letters

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An arbitrary-wave-form modulated induction thermal plasma ͑AMITP͒ system was developed using a high-power semiconductor high-frequency power supply. The modulated high-power plasma is a breakthrough technique for controlling the temperature and the radical density in high-density plasmas. The arbitrary-wave-form modulation of the coil current enables more detailed control of the temperature of the high-density plasmas than the pulse-amplitude modulation that has already been developed. The Ar AMITP with intentionally modulated coil current could be generated at a power of 10-15 kW. Results showed that the Ar excitation temperature between the specified excitation levels was changed intentionally according to the modulation control signal.

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Synthesis of nano-sized Al doped TiO2 powders using thermal plasma

Cited by 90 publications

References 18 publications

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Fabrication of TiO<sub>2</sub> Coated Cotton-Yarn as High-Dielectric-Constant Fiber for 3-D Photonic Crystal Application

Generation of high-power arbitrary-wave-form modulated inductively coupled plasmas for materials processing

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Synthesis of nano-sized Al doped TiO2 powders using thermal plasma

Cited by 90 publications

References 18 publications

A method for large-scale synthesis of Al-doped TiO2nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

A method for large-scale synthesis of Al-doped TiO2nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

Fabrication of TiO<sub>2</sub> Coated Cotton-Yarn as High-Dielectric-Constant Fiber for 3-D Photonic Crystal Application

Generation of high-power arbitrary-wave-form modulated inductively coupled plasmas for materials processing

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A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding

A method for large-scale synthesis of Al-doped TiO₂nanopowder using pulse-modulated induction thermal plasmas with time-controlled feedstock feeding