Development and Evaluation of Characteristics of Nanoporous Materials

Ohmura, Takahiro; Abe, Isami; Ito, Yasuo; Sato, Kazuyoshi; Abe, Hiroya; Naito, Makio

doi:10.4164/sptj.46.461

Cited by 14 publications

(7 citation statements)

References 9 publications

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“…Furthermore, the thermal conductivity of fumed silica compacts at higher temperature could also be kept at lower value by adding SiC powders as an opacifier. It was found that thermal insulation compacts made of powder mixture consisting of fumed silica: glass fiber: SiC at a mass ratio of 70:10:20 prepared by the particle bonding technique could achieve a thermal conductivity of 0.04 W/mK at 600°C [9]. By changing the kind of nanoparticle additives, it was expected that thermal conductivity of the compacts could be kept lower at even higher temperatures by particle bonding process in the future.…”

Section: Application Of Particle Bonding For Thermal Insulationmentioning

confidence: 99%

See 1 more Smart Citation

Smart powder processing for energy and environment

Naito¹,

Abe²,

Kondô³

2011

WIT Transactions on Ecology and the Environment

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Smart powder processing stands for novel powder processing techniques that create advanced materials with minimal energy consumption and environmental impacts. This process is also important from the viewpoint of sustainability. Particle bonding technology is a typical smart powder processing technique to make advanced composites. In this paper, its application examples for clean energy, energy-saving and novel recycling will be explained. For clean energy issues, the role of microstructure control of the electrodes for higher performance of Solid Oxide Fuel Cell (SOFC) by using particle bonding will be explained. From the viewpoint of energy-saving, a new method to produce fiber reinforced fumed silica compacts by making use of particle bonding will be introduced. It will be explained that the compacts have very low thermal conductivity with high porosity at high temperature. Furthermore, by carefully controlling the bonding between different kinds of materials, effective separation of elemental components can be achieved. It leads to the development of a novel technique for recycling advanced composite materials and turns them to high-functional applications. In this paper, its application for recycling of glass fiber reinforced plastics (FRP) will be explained.

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Section: Application Of Particle Bonding For Thermal Insulationmentioning

confidence: 99%

“…Fig. 5 shows the relationship between thermal conductivity and bulk density of the compact [9]. When fumed silica mass percentage increases, the bulk density decreases, thus leads to extremely lower thermal conductivity of the compact as shown in Fig.…”

Section: Processingmentioning

confidence: 99%

Smart powder processing for energy and environment

Naito¹,

Abe²,

Kondô³

2011

WIT Transactions on Ecology and the Environment

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“…The glass fiber reinforced nano-silica compacts have been successfully prepared using this technique [9][10][11][12][13]. By applying the mechanical stresses, the fiber's surface was coated with porous silica nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effect of mechanical processing on thermal and mechanical properties of fibrous fumed alumina compacts

Lian

Kondô

Kozawa

et al. 2018

Journal of Asian Ceramic Societies

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In the present study, the fibrous fumed alumina compact with low thermal conductivity is prepared with a mechanical processing technique. The thermal conductivity of the compact remains low up to a temperature of 350°C. For the fibrous compact, the mechanical processing parameters play important role on controlling the thermal insulation capability. The thermal conductivity of compact increases from 0.036 to 0.042 W/m•K by increasing the rotating speed of rotor. On the other hand, the value remains low by increasing processing time. The strength is decreased due to the increase of processing time. Thus, a lower rotating speed and a shorter processing time could result in a compact with favorable thermal insulation and strength. The results can be related to the surface structure of the coated alumina fibers and granulated structure within the compacts.

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“…Therefore, a highly uniform dispersion of fibers in the compact could be easily achieved 1 " 4 . Furthermore, the thermal conductivity of the fumed silica compacts at high temperature could also be kept at a low value by adding SiC powder as an opacifier 5 . However, the effect of the properties of the opacifiers on the thermal conductivity has not been fully determined.…”

Section: Introductionmentioning

confidence: 99%