Thermal conductivity and interface thermal conductance of amorphous and crystalline Zr47Cu31Al13Ni9 alloys with a Y2O3 coating

Shukla, Nitin; Liao, Hao-Hsiang; Abiade, Jeremiah T.; Liu, Fengxiao; Liaw, Peter K.; Huxtable, Scott T.

doi:10.1063/1.3090487

Cited by 20 publications

(13 citation statements)

References 22 publications

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“…Since the penetration depth of the modulated pump excitation is inversely proportional to the square root of the modulation frequency, the TDTR data taken at 11 MHz has minimal sensitivity to the buried GaSb/GaAs interface compared to 1.07 MHz data. Therefore, we use the two TDTR data sets ͑11 and 1.07 MHz͒ to determine h K at both the Al/GaSb and GaSb/GaAs interfaces in a similar procedure as outlined by Shukla et al 16 In our analysis, we use bulk literature values for the heat capacities of each layer and assume a bulk thermal conductivity of the GaAs substrate. [17][18][19] We estimate the reduced thermal conductivity of the Al transducer layer from electrical resistivity measurements on the Al film.…”

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confidence: 99%

Effect of dislocation density on thermal boundary conductance across GaSb/GaAs interfaces

Hopkins

Duda

Clark³

et al. 2011

Applied Physics Letters

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The structure of dislocations in (In,Al,Ga)N wurtzite films grown epitaxially on (0001) or (112) GaN or AlN substrates J. Appl. Phys. 112, 113507 (2012) Analysis of critical dimensions for axial double heterostructure nanowires J. Appl. Phys. 112, 114307 (2012) Dislocation-induced fields in piezoelectric AlGaN/GaN bimaterial heterostructuresWe report on the thermal boundary conductance across structurally-variant GaSb/GaAs interfaces characterized by different dislocations densities, as well as variably-rough Al/GaSb interfaces. The GaSb/GaAs structures are epitaxially grown using both interfacial misfit ͑IMF͒ and non-IMF techniques. We measure the thermal boundary conductance from 100 to 450 K with time-domain thermoreflectance. The thermal boundary conductance across the GaSb/GaAs interfaces decreases with increasing strain dislocation density. We develop a model for interfacial transport at structurally-variant interfaces in which phonon propagation and scattering parallels photon attenuation. We find that this model describes the measured thermal boundary conductances well.

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confidence: 99%

Effect of dislocation density on thermal boundary conductance across GaSb/GaAs interfaces

Hopkins

Duda

Clark³

et al. 2011

Applied Physics Letters

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“…The R bd is interpreted by an average phonon transmission probability at the interfaces in our approach, as described already above. It has been reported in the literature that the R bd in the nanoscale falls into the range of 1.0 × 10 −9 –1.0 × 10 −6 m 2 ·K/W [41,42,43,44], so the

R_{SWNT-PEEK}

was varied between 1.158 × 10 −9 and 1.158 × 10 −6 m 2 ·K/W, which corresponds to an average phonon transmission probability of 0.001–1.0. Similarly, the

R_{{WS}_{2} - PEEK}

ranged from 2.32 × 10 −10 to 2.32 × 10 −8 m 2 ·K/W, corresponding to an average phonon transmission probability from 0.005 to 0.5.…”

Section: Resultsmentioning

confidence: 99%

Review of Recent Developments on Using an Off-Lattice Monte Carlo Approach to Predict the Effective Thermal Conductivity of Composite Systems with Complex Structures

2016

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Here, we present a review of recent developments for an off-lattice Monte Carlo approach used to investigate the thermal transport properties of multiphase composites with complex structure. The thermal energy was quantified by a large number of randomly moving thermal walkers. Different modes of heat conduction were modeled in appropriate ways. The diffusive heat conduction in the polymer matrix was modeled with random Brownian motion of thermal walkers within the polymer, and the ballistic heat transfer within the carbon nanotubes (CNTs) was modeled by assigning infinite speed of thermal walkers in the CNTs. Three case studies were conducted to validate the developed approach, including three-phase single-walled CNTs/tungsten disulfide (WS2)/(poly(ether ether ketone) (PEEK) composites, single-walled CNT/WS2/PEEK composites with the CNTs clustered in bundles, and complex graphene/poly(methyl methacrylate) (PMMA) composites. In all cases, resistance to heat transfer due to nanoscale phenomena was also modeled. By quantitatively studying the influencing factors on the thermal transport properties of the multiphase composites, it was found that the orientation, aggregation and morphology of fillers, as well as the interfacial thermal resistance at filler-matrix interfaces would limit the transfer of heat in the composites. These quantitative findings may be applied in the design and synthesis of multiphase composites with specific thermal transport properties.

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“…Due to the close packing of the more adjacent laterally ordered regions, the number and size of the crystalline regions of Bombyx mori silk fibroin is increased by heat treatment. It is well known that the crystal phase is expected to have a higher thermal conductivity than the amorphous one . Based on the fact that how difficult it is to characterize the tiny structural change precisely and how dramatically the thermal property changes by even small structural change, it leads to an important point that, thermal property characterization can be used to reflect the overall structural change of the protein fibers under various treatments.…”

Section: Resultsmentioning

confidence: 99%

Thermally induced increase in energy transport capacity of silkworm silks

Liu

Cao

et al. 2014

Biopolymers

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This work reports on the first study of thermally induced effect on energy transport in single filaments of silkworm (Bombyx mori) fibroin degummed mild (type 1), moderate (type 2), to strong (type 3). After heat treatment from 140 to 220°C, the thermal diffusivity of silk fibroin type 1, 2, and 3 increases up to 37.9, 20.9, and 21.5%, respectively. Our detailed scanning electron microscopy study confirms that the sample diameter change is almost negligible before and after heat treatment. Raman analysis is performed on the original and heat-treated (at 147°C) samples. After heat treatment at 147°C, the Raman peaks at 1081, 1230, and 1665 cm(-1) become stronger and narrower, indicating structural transformation from amorphous to crystalline. A structure model composed of amorphous, crystalline, and laterally ordered regions is proposed to explain the structural change by heat treatment. Owing to the close packing of more adjacent laterally ordered regions, the number and size of the crystalline regions of Bombyx mori silk fibroin increase by heat treatment. This structure change gives the observed significant thermal diffusivity increase by heat treatment.

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Thermal conductivity and interface thermal conductance of amorphous and crystalline Zr47Cu31Al13Ni9 alloys with a Y2O3 coating

Abstract: Copyright by the AIP Publishing. Shukla, Nitin C.; Liao, Hao-Hsiang; Abiade, Jeremiah T.; et al., "Thermal conductivity and interface thermal conductance of amorphous and crystalline Zr47Cu31Al13Ni9 alloys with a Y2O3 coating," Appl. Phys. Lett. 94, 081912 (2009); http://dx

Cited by 20 publications

References 22 publications

Effect of dislocation density on thermal boundary conductance across GaSb/GaAs interfaces

Effect of dislocation density on thermal boundary conductance across GaSb/GaAs interfaces

Review of Recent Developments on Using an Off-Lattice Monte Carlo Approach to Predict the Effective Thermal Conductivity of Composite Systems with Complex Structures

Thermally induced increase in energy transport capacity of silkworm silks

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