Flash Thermal-Diffusivity Measurements Using a Laser

Deem, H.W.; Wood, W.D.

doi:10.1063/1.1717696

Cited by 61 publications

(14 citation statements)

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“…Time domain techniques for measuring the thermal transport of materials have proven invaluable for monitoring the thermal conductivity and thermal boundary conductance of multilayer structures due to the fact that the thermal effusivity or thermal diffusivity of a material responds differently than the thermal transport across an interfacial region in the time domain. Several time domain techniques have proven quite useful in measurement of these interfacial thermal properties, including laser �ash diffusivity [46], transient electrothermal techniques [47], and thermore�ectance techniques [48,49]. With recent progress in pulsed laser systems, thermore�ectance techniques employing short pulses have become a robust metrology to accurately determine the thermal transport in nanosystems, as I outline in the following.…”

Section: �� Time �Omain Thermore�ectance� An Effective Tool For Measumentioning

confidence: 99%

Thermal Transport across Solid Interfaces with Nanoscale Imperfections: Effects of Roughness, Disorder, Dislocations, and Bonding on Thermal Boundary Conductance

Hopkins

2013

ISRN Mechanical Engineering

253

203

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The efficiency in modern technologies and green energy solutions has boiled down to a thermal engineering problem on the nanoscale. Due to the magnitudes of the thermal mean free paths approaching or overpassing typical length scales in nanomaterials (i.e., materials with length scales less than one micrometer), the thermal transport across interfaces can dictate the overall thermal resistance in nanosystems. However, the fundamental mechanisms driving these electron and phonon interactions at nanoscale interfaces are difficult to predict and control since the thermal boundary conductance across interfaces is intimately related to the characteristics of the interface (structure, bonding, geometry, etc.) in addition to the fundamental atomistic properties of the materials comprising the interface itself. In this paper, I review the recent experimental progress in understanding the interplay between interfacial properties on the atomic scale and thermal transport across solid interfaces. I focus this discussion specifically on the role of interfacial nanoscale “imperfections,” such as surface roughness, compositional disorder, atomic dislocations, or interfacial bonding. Each type of interfacial imperfection leads to different scattering mechanisms that can be used to control the thermal boundary conductance. This offers a unique avenue for controlling scattering and thermal transport in nanotechnology.

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Section: �� Time �Omain Thermore�ectance� An Effective Tool For Measumentioning

confidence: 99%

Thermal Transport across Solid Interfaces with Nanoscale Imperfections: Effects of Roughness, Disorder, Dislocations, and Bonding on Thermal Boundary Conductance

Hopkins

2013

ISRN Mechanical Engineering

253

203

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“…r e c e i v e d a g r e a t d e a l of c o n s i d e r a t i o n i n t h e l i t e r a t u r e (44,45,46,47). A pulsed ruby l a s e r was used by Deem and Wood (48) i n 1962 a s t h e energy s o u r c e i n a s t u d y of t h e thermal d i ff u s i v i t y of s t a i n l e s s s t e e l and g r a p h i t e . S e v e r a l a u t h o r s …”

Section: Thermal Dlffusivlty Theorymentioning

confidence: 99%

Elastic properties of polycrystalline Gd<sub>2</sub>O

Häglund¹

1972

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A r e s o n a n t .frequency t e c h n i q u e was u s e d t o d e t e r m i n e t h e e f f e c t . t h a t t e m p e r a t u r e and p o r o s i t y have on t h e e1asti.c p r o p e r t i e s , o f g a d o l i n i a , w h i l e t h e t e m p e r a t u r e dependence o f t h e r m a l d i f f u s i v i t y was i n v e s t i g a t e d by a f l a s h method.Young's . . modulus, s h e a r modulus, and P o i s s o n ' s r a t i o were s t u d i e d from 2.48% t o 36.78% p o r o s i t y t o y i e l d p o r o s i t y dependence c u r v e s , w i t h t h e e x t r a p o l a t e d 0 % p o r o s i t y v a l u e s e n a b l i n g t h e c a l c u l a t 2 o n of t h e Debye t e m p e r a t u r e . S e l e c t e d spec-imenswere chosen t o be a n a l y z e d from room t e m p e r a t u r e t o 135Z°C t o d e t e r m i n e c u r v e s f o r the' t e m p e r a t u r e 'dependence o f , Young's . .modulus, s h e a r modulus, Poi.ss,onts r a t i -o , bulk' modu'lus,. and t h e f i r s t -(y) and second' ( 8 ) .Griinefsen c o n s t a n t s .

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“…Measurennents were made by each of the two laboratories, using calibrated equipment. Each laboratory used ' (9)(10)(11) The flash technique was employed by both laboratories in measuring thermal diffusivity. The specific heat measurements at Atomics International were conducted, using an electrical pulse heating technique, ' while (13) Battelle ennployed an ice drop calorimeter.…”

Section: A General Commentsmentioning

confidence: 99%