Thermal Transport Properties of Melt-Shear Oriented iPP/Carbon Nanotube Thin Films

2012 ◽  
Vol 1410 ◽  
Author(s):  
Parvathalu Kalakonda ◽  
Erin A. Gombos ◽  
Georgi Y. Georgiev ◽  
Germano S. Iannacchione ◽  
Peggy Cebe
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Transport Properties ◽  
Room Temperature ◽  
Orientational Order ◽  
Weight Percent ◽  
Colloidal Dispersions ◽  
Shear Direction ◽  
Conductivity Measurements ◽  
Percent Concentration

ABSTRACTTransport properties of polymer nanocomposites become increasingly important for range applications with many outstanding questions remaining. Thermal conductivity is especially important in applications like temperature sensing and packaging. We chose isotactic PolyPropylene (iPP) as one of the most widely used polymers and created nano-colloidal dispersions at different weight percent concentration of carbon nanotubes (CNTs). We oriented the thin-film samples using melt-shear at 200°C and 1Hz in a Linkam microscope shearing hot stage. Thermal conductivity measurements were performed at room temperature on two iPP/CNT sheared thin-film samples (1% and 5% CNT content) both parallel and perpendicular to the shear direction as well as a pure iPP sheared thin-film, prepared using the same process. Our findings indicate that the CNTs enhance kappa by 12% for the 1% CNT sample and 35% by the 5% CNT sample compared to that measured for pure iPP. Additionally, the CNTs under shear induce a novel anisotropy to the thermal conductivity in iPP/CNTs nano-composites. We introduce an approach to extract the shear induced orientational order of thermal conductivity by the dispersed CNTs.

Thermoelectric Properties of Semiconducting Intermetallic Compounds: FeGa3and RuGa3

2003 ◽  
Vol 793 ◽  
Author(s):  
Y. Amagai ◽  
A. Yamamoto ◽  
C. H. Lee ◽  
H. Takazawa ◽  
T. Noguchi ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
High Temperature ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Thermoelectric Figure Of Merit ◽  
Thermoelectric Figure ◽  
High Seebeck Coefficient

ABSTRACTWe report transport properties of polycrystalline TMGa3(TM = Fe and Ru) compounds in the temperature range 313K<T<973K. These compounds exhibit semiconductorlike behavior with relatively high Seebeck coefficient, electrical resistivity, and Hall carrier concentrations at room temperature in the range of 1017- 1018cm−3. Seebeck coefficient measurements reveal that FeGa3isn-type material, while the Seebeck coefficient of RuGa3changes signs rapidly from large positive values to large negative values around 450K. The thermal conductivity of these compounds is estimated to be 3.5Wm−1K−1at room temperature and decreased to 2.5Wm−1K−1for FeGa3and 2.0Wm−1K−1for RuGa3at high temperature. The resulting thermoelectric figure of merit,ZT, at 945K for RuGa3reaches 0.18.

scholarly journals Thin-Film Thermal Conductivity Measurements Using Superconducting Nanowires

2018 ◽  
Vol 193 (3-4) ◽  
pp. 380-386 ◽  
Author(s):  
J. P. Allmaras ◽  
A. G. Kozorezov ◽  
A. D. Beyer ◽  
F. Marsili ◽  
R. M. Briggs ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Conductivity Measurements ◽  
Superconducting Nanowires

Deposition of Al-Doped Zinc Oxide by Direct Pulsed Laser Recrystallization at Room Temperature on Various Substrates for Solar Cell Applications

2012 ◽  
Author(s):  
Martin Y. Zhang ◽  
Qiong Nian ◽  
Gary J. Cheng
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Solar Cell ◽  
Melting Point ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Laser Deposition ◽  
Flexible Substrates ◽  
Laser Recrystallization ◽  
Azo Thin Film

In this study, a method combining room temperature pulsed laser deposition (PLD) and direct pulsed laser recrystallization (DPLR) are introduced to deposit superior transparent conductive oxide (TCO) layer on low melting point flexible substrates. As an indispensable component of thin film solar cell, TCO layer with a higher quality will improve the overall performance of solar cells. Alumina-doped zinc oxide (AZO), as one of the most promising TCO candidates, has now been widely used in solar cells. However, to achieve optimal electrical and optical properties of AZO on low melting point flexible substrate is challenging. Recently developed direct pulsed laser recrystallization (DPLR) technique is a scalable, economic and fast process for point defects elimination and recrystallization at room temperature. It features selective processing by only heating up the TCO thin film and preserve the underlying substrate at low temperature. In this study, 250 nm AZO thin film is pre-deposited by pulsed laser deposition (PLD) on flexible and rigid substrates. Then DPLR is introduced to achieve a uniform TCO layer on low melting point flexible substrates, i.e. commercialized Kapton polyimide film and micron-thick Al-foil. Both finite element analysis (FEA) simulation and designed experiments are carried out to demonstrate that DPLR is promising in manufacturing high quality AZO layers without any damage to the underlying flexible substrates. Under appropriate experiment conditions, such as 248 nm in laser wavelength, 25 ns in laser pulse duration, 15 laser pulses at laser fluence of 25 mJ/cm2, desired temperature would result in the AZO thin film and activate the grain growth and recrystallization. Besides laser conditions, the thermal conductivity and crystallinity of the substrate serve as additional factors in the DPLR process. It is found that the substrate’s thermal conductivity correlates positively with the AZO crystal size; the substrate’s crystallinity correlates positively with the AZO film’s crystallinity. The thermal expansion of substrate would also contribute to the film tensile stress after processed by DPLR technique. The overall results indicate that DPLR technique is useful and scalable for flexible solar cell manufacturing.

Reinvestigation the Thermal and Electrical Transport Properties of Tl7Sb2

2013 ◽  
Vol 802 ◽  
pp. 284-288
Author(s):  
Anek Charoenphakdee ◽  
Adul Harnwangmuang ◽  
Tosawat Seetawan ◽  
Chesta Ruttanapun ◽  
Vittaya Amornkitbamrung ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Transport Properties ◽  
Electrical Transport ◽  
Room Temperature ◽  
Lattice Parameter ◽  
Electronic Contribution ◽  
Electrical Transport Properties ◽  
Space Group ◽  
Crystal System ◽  
Thallium Compounds

The authors examined the thermal and electrical transport properties of Tl7Sb2 at temperatures ranging from room temperature to 400 K. The crystal system of Tl7Sb2 is cubic with the lattice parameter a = 1.16053 nm and the space group is Im3m. The polycrystalline samples were prepared by melting stoichiometric amounts of thallium and antimony. Although, usually the thermal conductivity of thallium compounds is very low (<1 Wm-1K-1), that of Tl7Sb2 was relatively high (~13 Wm-1K-1 at room temperature). This is because of the large electronic contribution to the thermal conductivity.

411 In-Plane Thermal Conductivity and Electrical Conductivity Measurements of Silicon Thin Film

2012 ◽  
Vol 2012.65 (0) ◽  
pp. 139-140
Author(s):  
Harutoshi HAGINO ◽  
Yosuke KAWAHARA ◽  
Aimi GOTO ◽  
Toru HIWADA ◽  
Koji Miyazaki
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Conductivity Measurements ◽  
Silicon Thin Film

Cellular Automata Simulations of Thermal Transport Properties of Thin-Film Polymer/CNTs Nano-Composites for Improved Design

2014 ◽  
Vol 1619 ◽  
Author(s):  
P. Kalakonda ◽  
A. Casey ◽  
G. S. Iannacchione ◽  
G. Y. Georgiev ◽  
Y. Cabrera ◽  
...  
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Cellular Automata ◽  
Transport Properties ◽  
Thermal Transport ◽  
Film Plane ◽  
Property Relation ◽  
Improved Design ◽  
Film Polymer ◽  
Film Nanocomposites

ABSTRACTA computational algorithm has been developed to simulate the transport properties of oriented and un-oriented thin film nanocomposites of isotactic Polypropylene (iPP) and carbon nanotubes (CNT) with increasing CNT concentration. Our goal is to be able to design materials with optimal properties using these simulations. We use a cellular automata approach in a Matlab 3-D array environment. The percolation threshold is reproduced in the simulations, matching experimental data. Upon percolation, the thermal transport in the films increases sharply, due to the large difference in the thermal conductivities of the CNTs and the polymer. To verify the simulation, the thin-film samples were sheared in the melt at 200C at 1 Hz in a Linkan microscope shearing hot stage. The thermal conductivity measurements were performed on the same cell arrangement with the transport perpendicular to the thin-film plane using a DC method. The thermal conductivity is higher for the un-sheared as compared to the sheared samples. Our cellular automata simulations provide information about the microstructuremacroscopic property relation in the thin film nanocomposites and can be extended to simulations of other important materials.

Thermal conductivity measurements of thin-film resist

2001 ◽  
Vol 19 (6) ◽  
pp. 2874 ◽  
Author(s):  
Dachen Chu ◽  
Maxat Touzelbaev ◽  
Kenneth E. Goodson ◽  
Sergey Babin ◽  
R. Fabian Pease
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Conductivity Measurements

Workshop on thin film thermal conductivity measurements

1998 ◽  
Author(s):  
Albert Feldman ◽  
Naira M. Balzaretti ◽  
Arthur H. Guenther
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Conductivity Measurements
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