Fabrication of thermoelectric CuAlO2 and performance enhancement by high density

Lu, Yun; Nozue, Takahiro; Feng, Ningbo; Sagara, Katsuhiro; Yoshida, Hiroyuki; Jin, Yang

doi:10.1016/j.jallcom.2015.08.013

Cited by 24 publications

(11 citation statements)

References 12 publications

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“…The increase in the ZT value could be assorted to the rapid increase in the conductivity of the sample. Compared to the ZT values reported by Chang, et al (4.0 × 10 −3 at 750 K) and Lu, et al (5.0 × 10 −3 at 823 K), the ZT value of CAO ceramics with 9.5% glass added is about two times larger at the similar temperature range. In brief, the addition of aluminosilicate glass improves the thermoelectric behavior of CAO ceramics due to the enhanced conductivity.…”

Section: Resultscontrasting

confidence: 54%

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Zhu

Zheng

et al. 2018

Int J Applied Ceramic Tech

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Delafossite CuAlO2 (CAO) ceramics were fabricated by the solid‐state route, using aluminosilicate glass powders as a sintering aid to improve the sintering ability and electrical conductivity, at 1473 K for 3 hours. The CAO ceramics with glass addition obviously enhanced bulk density, grain size, and electrical conductivity. It is found that the conductivity of CAO ceramics increased with the increase in glass content under 9.5%, whereas it was over 9.5%, the conductivity went down. The glass coming up to 9.5% increased the sintering ability and the electrical conductivity which was increased by one order of magnitude, thus increasing the figure of merit ZT for thermoelectric performance of our CAO added with 9.5% glass up to 9.82 × 10−3 at 773 K, which is a high value among the CAO ceramics. Besides, the impedance analysis shows that the impedance of the CAO ceramic was controlled by its grain boundary.

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Section: Resultscontrasting

confidence: 54%

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Zhu

Zheng

et al. 2018

Int J Applied Ceramic Tech

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“…Journal of Nanomaterials In fluid mechanics, Reynolds number is an important factor to predict the behavior of liquids on a larger scale [8]. These predictions can be used to measure turbulence as well as calculate the effects of scaling.…”

Section: Thermal Conductivity Of Nanofluidmentioning

confidence: 99%

“…Recent studies reveal that nanofluids have excellent thermal properties, thermal diffusivity, thermal conductivity, viscosity, specific heat capacity, and heat transfer coefficients [5][6][7]. However, liquids consisting of particles manifest many issues in terms of particle deposition, blockage of flow paths, corrosion of pipelines, and low pressure [8,9]. Recent advances in material technology allow the synthesis of innovative heat transfer fluids with enhanced transport and thermal properties by suspending nanoparticles in base fluids [9].…”

Section: Introductionmentioning

confidence: 99%

“…Nanofluids can be synthesized by either one-or two-step methods. In the one-step technique, nanoparticles and nanofluids are prepared together; hence, this route can reduce the aggregation of nanoparticles during drying, storage, transport, and dispersion of nanoparticles [8]. Therefore, it is impractical to implement the one-step technique on a wide manufacturing scale [10].…”

Section: Introductionmentioning

confidence: 99%

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Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

Alhummiany

2018

Journal of Nanomaterials

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Ultra-high cooling performance is a crucial requirement of many thermomechanical systems, such as microelectronic devices, engine cooling systems, nuclear power systems, chemical reactors, and refrigeration systems. Recent experimental results reveal the potential thermal properties of suspended nanometallics in conventional fluids. In this study, the facile synthesis of one-dimensional delafossite CuAlO 2 nanowires by microwave hydrothermal treatment was presented. A novel type of nanofluid consisting of CuAlO 2 nanowires suspended in distilled water at various volume fractions (0.0, 0.2, 0.4, and 0.6 wt%) was successfully synthesized using an easily scalable sonication method. The microstructures of as-synthesized CuAlO 2 were investigated by adopting X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and field-emission scanning electron microscopy (FESEM). Furthermore, the thermal conductivity and specific heat capacity of water-loaded nanofluid were measured at different volume fractions and temperatures. The results reveal a significant increase in thermal conductivity with increasing CuAlO 2 loading levels and temperatures. The obtained results propound the fact that water-loaded delafossite CuAlO 2 nanowires-based nanofluid is a promising candidate for future industrial applications.

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“…As for the surface area, calculated by the BET equation, the sol gel samples are 8 times larger than the samples by impregnation, see Table . This event indicates that metal interactions with active sites of alumina favor high surface areas . Figure presents the results of the X‐ray diffraction.…”

Section: Resultsmentioning

confidence: 96%

Effect of the CuAl₂O₄and CuAlO₂Phases in Catalytic Wet Air Oxidation of ETBE and TAME using CuO/γ‐Al₂O₃catalysts

et al. 2019

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This paper studies Cu/Al 2 O 3 catalysts, synthesized in two ways: copper deposit in the synthesis of alumina (sol gel) and incipient impregnation stabilized at 400 °C. The materials were characterized by X‐ray diffraction studies, nitrogen physisorption, temperature programmed reduction of H 2 , dehydration of isopropanol, scanning electronic microscopy, transmission electronic microscopy, which were evaluated in the liquid phase oxidation reaction of ethyl tert‐butyl ether and tert‐amyl methyl ether. The formation of CuAl 2 O 4 and CuAlO 2 in the samples synthesized by sol gel, led to a modification of the texture, thus resulting in an expansion of the specific area of the materials. CuAl 2 O 4 and CuAlO 2 have been identified by DRX from a content of 10 % Copper, the first showed the highest intensity with this technique. In the same way, these species favor the presence of Lewis acid sites; this is reflected in the materials with (Di‐isopropyl Ether) DIPE of 96.7 % and 91.1 % for the samples SAlCu5 and SAlCu15 respectively. The catalytic activity of the materials prepared by sol gel is in the function of the number of surface acid sites, the smaller particle size of the Cu and the surface of the contact, in the case of the ETBE meanwhile for TAME the activity was based mainly on the strength of the present acid sites. With impregnated materials, the activity is attributed to the smaller particle size of the Cu and the greater strength of the surface acid sites in the solid. The formation of spinel species inhibits the leaching phenomenon in the reaction milieu.

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Fabrication of thermoelectric CuAlO2 and performance enhancement by high density

Cited by 24 publications

References 12 publications

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

Effect of the CuAl₂O₄and CuAlO₂Phases in Catalytic Wet Air Oxidation of ETBE and TAME using CuO/γ‐Al₂O₃catalysts

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Fabrication of thermoelectric CuAlO2 and performance enhancement by high density

Cited by 24 publications

References 12 publications

Improvement in electrical properties of thermoelectric CuAlO2 ceramics aided by aluminosilicate glass

Improvement in electrical properties of thermoelectric CuAlO2 ceramics aided by aluminosilicate glass

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO2 Nanowires: Structural and Thermal Properties

Effect of the CuAl2O4and CuAlO2Phases in Catalytic Wet Air Oxidation of ETBE and TAME using CuO/γ‐Al2O3catalysts

Contact Info

Product

Resources

About

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Improvement in electrical properties of thermoelectric CuAlO₂ ceramics aided by aluminosilicate glass

Novel Nanofluid Based on Water-Loaded Delafossite CuAlO₂ Nanowires: Structural and Thermal Properties

Effect of the CuAl₂O₄and CuAlO₂Phases in Catalytic Wet Air Oxidation of ETBE and TAME using CuO/γ‐Al₂O₃catalysts