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Testing theories for thermal transport using high pressure.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Testing theories for thermal transport using high pressure./
Author:	Hsieh, Wen-Pin.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2011,
Description:	155 p.
Notes:	Source: Dissertations Abstracts International, Volume: 73-11, Section: B.
Contained By:	Dissertations Abstracts International73-11B.
Subject:	High Temperature Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3503552
ISBN:	9781267272140

Testing theories for thermal transport using high pressure.
Hsieh, Wen-Pin.

Testing theories for thermal transport using high pressure. - Ann Arbor : ProQuest Dissertations & Theses, 2011 - 155 p.

Source: Dissertations Abstracts International, Volume: 73-11, Section: B.

Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2011.

This item must not be sold to any third party vendors.

This dissertation focuses on experimental studies of thermal transport in various materials, such as heat transfer in crystals and amorphous polymers, and across interfaces, using an ultrafast pump-probe method, time-domain thermoreflectance (TDTR), combined with gem anvil cell techniques. I demonstrated that pressure tuning of physical properties of materials is an elegant approach to test the validity of theories for thermal transport. Pressure dependence of the cross-plane thermal conductivity Λ( P) of a layered muscovite mica crystal was measured by TDTR combined with diamond anvil cell techniques. Under a simple relaxation time approximation, most of the Λ(P) of muscovite mica can be described by the pressure dependence of the cross-plane sound velocity, indicating that the cross-plane sound velocity plays an important role in the thermal transport in a layered crystal. The validity of the minimum thermal conductivity model for amorphous polymers was verified by the good agreement between my measurements of the pressure dependent thermal conductivity of poly(methyl methacrylate) (PMMA) and the model prediction. The thermal energy exchange between non-propagating vibrational modes is the dominant mechanism of thermal transport in amorphous polymers. I also used high pressure to demonstrate the importance of interface stiffness on the interfacial thermal transport. By measuring the pressure dependence of thermal conductance G(P) of clean and modified Al/SiC interfaces, I found that G( P) of a clean interface with high interface stiffness is weakly dependent on pressure and can be well accounted for by the diffuse mismatch model (DMM). By contrast, G(P) of modified interfaces with low interface stiffness initially increase rapidly with pressure; as the interface stiffness is increased to be comparable to the stiffness of chemical bonds, G(P) saturate at the value for the clean interface and value predicted by the DMM. In order to extend the TDTR measurements to high pressures and high temperatures, I studied the pressure dependent thermoreflectance and piezo-optical coefficient of metal film transducers-Al, Ta, and Au(Pd) alloy (≈5 at. % Pd) at a laser wavelength of 785 nm. The thermoreflectance of Ta and Au(Pd) are comparable to that of Al at ambient conditions and independent of pressure in the range 0 to that of Al at ambient conditions and independent of pressure in the range 0<P<10 GPa. Ta and Au(Pd) also present strong acoustic echo strengths in this pressure range. I conclude that Ta and Au(Pd) films can replace Al as metal transducers and extend TDTR to higher pressures and temperatures.

ISBN: 9781267272140Subjects--Topical Terms:

3549859
High Temperature Physics.
Subjects--Index Terms:

Amorphous polymers

Testing theories for thermal transport using high pressure.
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300 $a 155 p.
500 $a Source: Dissertations Abstracts International, Volume: 73-11, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Cooper, S. Lance;Cahill, David G.
502 $a Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2011.
506 $a This item must not be sold to any third party vendors.
520 $a This dissertation focuses on experimental studies of thermal transport in various materials, such as heat transfer in crystals and amorphous polymers, and across interfaces, using an ultrafast pump-probe method, time-domain thermoreflectance (TDTR), combined with gem anvil cell techniques. I demonstrated that pressure tuning of physical properties of materials is an elegant approach to test the validity of theories for thermal transport. Pressure dependence of the cross-plane thermal conductivity Λ( P) of a layered muscovite mica crystal was measured by TDTR combined with diamond anvil cell techniques. Under a simple relaxation time approximation, most of the Λ(P) of muscovite mica can be described by the pressure dependence of the cross-plane sound velocity, indicating that the cross-plane sound velocity plays an important role in the thermal transport in a layered crystal. The validity of the minimum thermal conductivity model for amorphous polymers was verified by the good agreement between my measurements of the pressure dependent thermal conductivity of poly(methyl methacrylate) (PMMA) and the model prediction. The thermal energy exchange between non-propagating vibrational modes is the dominant mechanism of thermal transport in amorphous polymers. I also used high pressure to demonstrate the importance of interface stiffness on the interfacial thermal transport. By measuring the pressure dependence of thermal conductance G(P) of clean and modified Al/SiC interfaces, I found that G( P) of a clean interface with high interface stiffness is weakly dependent on pressure and can be well accounted for by the diffuse mismatch model (DMM). By contrast, G(P) of modified interfaces with low interface stiffness initially increase rapidly with pressure; as the interface stiffness is increased to be comparable to the stiffness of chemical bonds, G(P) saturate at the value for the clean interface and value predicted by the DMM. In order to extend the TDTR measurements to high pressures and high temperatures, I studied the pressure dependent thermoreflectance and piezo-optical coefficient of metal film transducers-Al, Ta, and Au(Pd) alloy (≈5 at. % Pd) at a laser wavelength of 785 nm. The thermoreflectance of Ta and Au(Pd) are comparable to that of Al at ambient conditions and independent of pressure in the range 0 to that of Al at ambient conditions and independent of pressure in the range 0<P<10 GPa. Ta and Au(Pd) also present strong acoustic echo strengths in this pressure range. I conclude that Ta and Au(Pd) films can replace Al as metal transducers and extend TDTR to higher pressures and temperatures.
590 $a School code: 0090.
650 4 $a High Temperature Physics. $3 3549859
650 4 $a Condensed matter physics. $3 3173567
650 4 $a Materials science. $3 543314
653 $a Amorphous polymers
653 $a Crystals
653 $a Heat transfer
653 $a High pressure
653 $a Thermal transport
690 $a 0597
690 $a 0611
690 $a 0794
710 2 $a University of Illinois at Urbana-Champaign. $b Physics. $3 3170744
773 0 $t Dissertations Abstracts International $g 73-11B.
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791 $a Ph.D.
792 $a 2011
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3503552