Lattice Dynamics Study on the Thermal Conduction Properties of Single Atomic Layer Films (II)—Numerical Calculations and Analysis on the Results

2020 ◽  
Vol 10 (06) ◽  
pp. 146-151
Author(s):  
建平 黄
Keyword(s):  
Lattice Dynamics ◽  
Thermal Conduction ◽  
Atomic Layer ◽  
Numerical Calculations ◽  
Conduction Properties

scholarly journals Ultrasensitive nano-optomechanical force sensor operated at dilution temperatures

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Francesco Fogliano ◽  
Benjamin Besga ◽  
Antoine Reigue ◽  
Laure Mercier de Lépinay ◽  
Philip Heringlake ◽  
...  
Keyword(s):  
Thermal Conduction ◽  
Photon Counting ◽  
Force Sensor ◽  
Lateral Force ◽  
Oscillation Period ◽  
The Road ◽  
Field Gradients ◽  
Concomitant Reduction ◽  
Generic Strategy ◽  
Conduction Properties

AbstractCooling down nanomechanical force probes is a generic strategy to enhance their sensitivities through the concomitant reduction of their thermal noise and mechanical damping rates. However, heat conduction becomes less efficient at low temperatures, which renders difficult to ensure and verify their proper thermalization. Here we implement optomechanical readout techniques operating in the photon counting regime to probe the dynamics of suspended silicon carbide nanowires in a dilution refrigerator. Readout of their vibrations is realized with sub-picowatt optical powers, in a situation where less than one photon is collected per oscillation period. We demonstrate their thermalization down to 32 ± 2 mK, reaching very large sensitivities for scanning probe force sensors, 40 zN Hz−1/2, with a sensitivity to lateral force field gradients in the fN m−1 range. This opens the road toward explorations of the mechanical and thermal conduction properties of nanoresonators at minimal excitation level, and to nanomechanical vectorial imaging of faint forces at dilution temperatures.

Research on Temperature Characteristic of Porous Cement Concrete

2011 ◽  
Vol 374-377 ◽  
pp. 2105-2109
Author(s):  
Li Qun Hu ◽  
Wei Si Ma ◽  
Hong Qing Hou
Keyword(s):  
Wind Speed ◽  
Moisture Content ◽  
Thermal Conduction ◽  
Temperature Characteristic ◽  
Specimen Thickness ◽  
Cement Concrete ◽  
Molding Process ◽  
Pressing Method ◽  
Island Effect ◽  
Conduction Properties

This research aims to study the temperature characteristic of porous cement concrete as an alternative pavement that can help to mitigate urban heat island effect, and all the benefits it can provide, along with several offspring. Three experiments conducted in this research focus on the effect of specimen thickness,moisture content and wind speed on the thermal conduction properties of porous cement concrete. Isostatic pressing method is adopted in the molding process of specimens and reserved holes method is utilized to measure the internal temperature of the specimens.The data presented in this paper explains the tend of thermal conduction properties accompanying the increase of specimen thickness,moisture content and wind speed.

scholarly journals Thermal conduction properties of microcracked media: Accounting for the unilateral effect

2019 ◽  
Vol 347 (12) ◽  
pp. 944-952
Author(s):  
Sharan Raj Rangasamy Mahendren ◽  
Hélène Welemane ◽  
Olivier Dalverny ◽  
Amèvi Tongne
Keyword(s):  
Thermal Conduction ◽  
Conduction Properties

Electrical and thermal conduction in ultra-thin freestanding atomic layer deposited W nanobridges

Nanoscale ◽  
2015 ◽  
Vol 7 (42) ◽  
pp. 17923-17928 ◽  
Author(s):  
Nathan T. Eigenfeld ◽  
Jonas C. Gertsch ◽  
George D. Skidmore ◽  
Steven M. George ◽  
Victor M. Bright
Keyword(s):  
Thermal Conduction ◽  
Atomic Layer ◽  
Phonon Conduction

Electro/thermal conduction is reduced substantially in ultra-thin ALD W films. Evidence of phonon conduction appears in fabricated W structures.

Phonons and Thermal Conductivity in Skutterudite Thermoelectrics

2003 ◽  
Vol 793 ◽  
Author(s):  
C. A. Kendziora ◽  
G. S. Nolas
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conduction ◽  
Screening Tool ◽  
Crucial Step ◽  
Theoretical Predictions ◽  
Filled Skutterudites ◽  
Scattering Spectra ◽  
Polarized Raman ◽  
Raman Scattering Spectra ◽  
Conduction Properties

ABSTRACTWe study Raman phonon vibrations and relate them to thermal conductivity for empty and filled skutterudites designed for thermoelectric applications, where low thermal conduction is critical. Polarized Raman scattering spectra of crystallite and polycrystalline samples are compared with theoretical predictions and analyzed in comparison to the thermal conduction properties. Our emphasis is on the CoSb3 skutterudite and its filled derivatives, including materials with Ge, Sn, and La in the cages. We observe a strong correlation between aspects of the Raman spectrum and low thermal conductivity. This presents Raman spectroscopy as a characteristic screening tool for potential thermoelectrics and is a crucial step toward predicting lattice thermal conductivities.

Electrical and Thermal Conduction in Atomic Layer Deposition Nanobridges Down to 7 nm Thickness

Nano Letters ◽  
2012 ◽  
Vol 12 (2) ◽  
pp. 683-686 ◽  
Author(s):  
Shingo Yoneoka ◽  
Jaeho Lee ◽  
Matthieu Liger ◽  
Gary Yama ◽  
Takashi Kodama ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Thermal Conduction ◽  
Atomic Layer ◽  
Layer Deposition

scholarly journals Nanoporous graphene: A 2D semiconductor with anisotropic mechanical, optical and thermal conduction properties

Carbon ◽  
2019 ◽  
Vol 147 ◽  
pp. 377-384 ◽  
Author(s):  
Bohayra Mortazavi ◽  
Mohamed E. Madjet ◽  
Masoud Shahrokhi ◽  
Said Ahzi ◽  
Xiaoying Zhuang ◽  
...  
Keyword(s):  
Thermal Conduction ◽  
Nanoporous Graphene ◽  
Conduction Properties
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