Surface Enhancement of Al2O3 Fiber With Nanosized Al2O3 Particles Using A Dry Mechanical Coating Process

Coowanitwong, Nowarat; Wu, Chang‐Yu; Nguyen, Judy; Cai, Mei; Ruthkosky, Martin S.; Rogers, Jerry D.; Lee, Feng; Watano, Satoru; Yoshida, Taizo

doi:10.1115/1.1555655

Cited by 3 publications

(3 citation statements)

References 15 publications

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“…Consisting of an elliptic rotor encased in an elliptical vessel, the dry particle coating system (Fig. 1) utilizes a dry coating technique to produce the powder composites [21][22][23][24][25] . The rotor operates at high revolution while the vessel rotates at low speeds in the opposite direction.…”

Section: Methodology Dr Y Particle Coating Systemmentioning

confidence: 99%

Hydrogen Storage Characteristics of Nickel Nanoparticle Coated Magnesium Prepared by Dry Particle Coating

Cooper

Yasensky

et al. 2005

KONA

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On-board hydrogen storage is an important obstacle to the development of a sustainable, ultra-low emission transportation system. A dry particle coating technique was used to coat micron-sized magnesium powders with Ni nanoparticles for hydrogen storage. Three parameters were explored in this study: powder size, nickel loading, and processing time. The composite materials were evaluated based upon a number of criteria, including the degree to which the nanoparticles were distributed over the Mg surface, the improvement in kinetics for hydrogen absorption, and the increased amount of hydrogen absorbed and desorbed. Comparisons were made between the bulk Mg powders and those coated with Ni. Due to the high shear forces it created, the dry particle coating system effectively distributed Ni nanoparticles onto the Mg powder surface. A coating process that required 48 hours using traditional ball milling was reduced to 90 minutes with the dry particle coating system. Magnesium powder with a mean diameter of 44 microns and a nickel loading of 2 atomic weight percent was the most kinetically active for hydrogen absorption under the conditions studied. Hydrogen absorption began at 150°C, and desorption started at 250°C. The dry particle coating system, however, did not alter the magnesium microstructure during 90 minutes of processing and did not produce the large surface areas generated by ball milling.

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Section: Methodology Dr Y Particle Coating Systemmentioning

confidence: 99%

Hydrogen Storage Characteristics of Nickel Nanoparticle Coated Magnesium Prepared by Dry Particle Coating

Cooper

Yasensky

et al. 2005

KONA

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“…Assuming the surface areas of the fiber and the nanoparticles are independent, the total surface area of the product can be considered as the sum of individuals (Coowanitwong et al, 2003a) as shown below:…”

Section: Set Iii: Effects Of Cuo and Al 2 O 3 Loadings And Temperaturementioning

confidence: 99%

“…This technique applies high shear and compression forces to adhere REMOVAL OF NITROGEN OXIDES BY DRY MECHANICAL COATING TECHNIQUE 139 guest materials onto a host substrate (Watano et al, 2000;Pfeffer et al, 2001). With intensive compression and shear forces, good dispersion and a high degree of mixing of the guest materials on the substrates can be achieved (Iwasaki et al, 2000;Coowanitwong et al, 2003a). The operation is simple (Iwasaki et al, 2002), and the process is economical and environmentally friendly by not producing organic or aqueous waste streams (Singh et al, 1997;Pfeffer et al, 2001).…”

Section: Introductionmentioning

confidence: 98%

Removal of Nitrogen Oxides Using Nanosized Catalysts Prepared by Dry Mechanical Coating Technique

Coowanitwong

Cai

et al. 2007

Environmental Engineering Science

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Nitrogen oxides (NO x ) are the key air pollutants emitted by mobile and stationary sources, and are a major cause of adverse health and environmental effects. One promising alternative material to conventional noble metal-based catalysts for NO x emission control is the group of transition metal oxides, in particular, CuO. In this study, well-dispersed CuO and CuO/Al 2 O 3 nanocatalysts coated onto durable Al 2 O 3 fiber substrates were assessed for NO conversion efficiency. The resultant composite materials had high surface area with good dispersion for enhanced NO conversion. Operating parameters, including nanocatalysts loading and temperature, were investigated for their effects on the catalytic performance for NO conversion. The experimental results showed that the activity of the catalysts is strongly related to the loading amount and the degree of dispersion of CuO nanoparticles. The binary CuO/Al 2 O 3 system yielded a higher NO conversion efficiency than the system consisting of CuO alone. Small amounts of Al 2 O 3 employed in the binary system resulted in better dispersion, and subsequently the achievement of higher NO conversion efficiency. The stability of the catalysts was demonstrated over a wide range of temperatures, and proved satisfactory for the harsh environment of the exhaust system. However, sintering and alloying effects that result in a decrease in surface area may potentially lower the catalytic activity at high temperatures.

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Coowanitwong

Cai

et al. 2003

Journal of Nanoparticle Research

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Surface Enhancement of Al2O3 Fiber With Nanosized Al2O3 Particles Using A Dry Mechanical Coating Process

Cited by 3 publications

References 15 publications

Hydrogen Storage Characteristics of Nickel Nanoparticle Coated Magnesium Prepared by Dry Particle Coating

Hydrogen Storage Characteristics of Nickel Nanoparticle Coated Magnesium Prepared by Dry Particle Coating

Removal of Nitrogen Oxides Using Nanosized Catalysts Prepared by Dry Mechanical Coating Technique

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