scholarly journals Thermal conductivity measurements of thin films by non-contact scanning thermal microscopy under ambient conditions

2021 ◽  
Author(s):  
Yun Zhang ◽  
Wenkai Zhu ◽  
Theodorian Borca-Tasciuc
Keyword(s):  
Heat Transfer ◽  
Thin Films ◽  
Thermal Conductivity ◽  
Finite Element ◽  
Transition Regime ◽  
Conductivity Measurements ◽  
Scanning Thermal Microscopy ◽  
Ambient Conditions ◽  
Fast Analysis ◽  
Heat Transfer Modeling

Accurate thermal conductivity measurements of nanoscale thin-films on substrate samples by non-contact SThM with finite element heat transfer modeling in transition regime and with fitting functions and analytical heat transfer modeling for fast analysis.

scholarly journals Sensitivity and Spatial Resolution for Thermal Conductivity Measurements using Non-contact Scanning Thermal Microscopy with Thermoresistive Probes under Ambient Conditions

2021 ◽  
Author(s):  
Yun Zhang ◽  
Wenkai Zhu ◽  
Theodorian Borca-Tasciuc
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Spatial Resolution ◽  
Conductivity Measurement ◽  
Thermal Conductivity Measurement ◽  
Conductivity Measurements ◽  
Scanning Thermal Microscopy ◽  
Ambient Conditions ◽  
Measurement Sensitivity ◽  
Sample Heat

Abstract Thermoresistive probes are increasingly popular in thermal conductivity characterization using Scanning Thermal Microscopy (SThM). A systematic analysis of the thermal conductivity measurement performance (sensitivity and spatial resolution) of thermoresistive SThM probe configurations that are available commercially is of interest to practitioners. In this work, the authors developed and validated 3-Dimensional Finite Element Models (3DFEM) of non-contact SThM with self-heated thermoresistive probes under ambient conditions with the probe-sample heat transfer in transition heat conduction regime for the four types of SThM probe configurations resembling commercially available products: Wollaston wire (WW) type probe, Kelvin Nanotechnology (KNT) type probe, Doped Silicon (DS) type probe, and Nanowire (NW) type probe. These models were then used to investigate the sensitivity and spatial resolution of the WW, KNT, DS and NW type probes for thermal conductivity measurements in non-contact mode in ambient conditions. The comparison of the SThM probes performance for measuring sample thermal conductivity and for the specific operating conditions investigated here show that the NW type probe has the best spatial resolution while the DS type probe has the best thermal conductivity measurement sensitivity in the range between 2-10 W·m−1·K−1. The spatial resolution is negatively affected by large probe diameters or by the presence of the cantilever in close proximity to the sample surface which strongly affects the probe-sample heat transfer in ambient conditions. An example of probe geometry configuration optimization was illustrated for the WW probe by investigating the effect of probe wire diameter on the thermal conductivity measurement sensitivity, showing ∼20% improvement in spatial resolution at the diameter with maximum thermal conductivity measurement sensitivity.

Research on Heat Transfer Characteristics of Nano-Porous Silica Aerogel Material and its Application on Mars Surface Mission

2014 ◽  
Vol 924 ◽  
pp. 329-335 ◽  
Author(s):  
Cong Hang Li ◽  
Shi Chen Jiang ◽  
Zheng Ping Yao ◽  
Song Sheng ◽  
Xin Jian Jiang ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Silica Aerogel ◽  
Thermal Environment ◽  
Porous Silica ◽  
Heat Transfer Model ◽  
Heat Radiation ◽  
Transfer Model ◽  
Ambient Conditions ◽  
Coupled Heat Transfer

Based on the nanoporous network structure features of silica aerogel, the gas-solid coupled heat transfer model of silica aerogel is analyzed, and the calculation formulas of the gas-solid coupled, the gas thermal conductivity and the heat radiation within the aerogel are derived. The thermal conductivity of pure silica aerogel is calculated according to the derived heat transfer model and is also experimentally measured. Moreover, measurements on the thermal conductivities of silica aerogel composites with different densities at ambient conditions are performed. And finally, a novel design of silica aerogel based integrated structure and thermal insulation used for withstanding the harsh thermal environment on the Martin surface is presented.

Non‐Contact Mass Density and Thermal Conductivity Measurements of Organic Thin Films Using Frequency–Domain Thermoreflectance

2021 ◽  
pp. 2101404
Author(s):  
Christopher Perez ◽  
Robert Knepper ◽  
Michael P. Marquez ◽  
Eric C. Forrest ◽  
Alexander S. Tappan ◽  
...  
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Frequency Domain ◽  
Mass Density ◽  
Organic Thin Films ◽  
Conductivity Measurements ◽  
Contact Mass

Influence of Shape of Nanoparticles on Nanofluid Hydrothermal Behavior

2018 ◽  
pp. 331-388
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Finite Element Method ◽  
Finite Element ◽  
Stream Function ◽  
Shape Factor ◽  
Control Volume ◽  
Flow And Heat Transfer ◽  
Shape Of Nanoparticles ◽  
Stream Function Formulation

The shape of nanoparticles can change the thermal conductivity of nanofluid. So, the effect of shape factor on nanofluid flow and heat transfer has been reported in this chapter. Governing equations are presented in vorticity stream function formulation. Control volume-based finite element method (CVFEM) is utilized to obtain the results. Results indicate that platelet shape has the highest rate of heat transfer.

A Self-Heated Thermistor Technique to Measure Effective Thermal Properties From the Tissue Surface

1987 ◽  
Vol 109 (4) ◽  
pp. 330-335 ◽  
Author(s):  
P. A. Patel ◽  
J. W. Valvano ◽  
J. A. Pearce ◽  
S. A. Prahl ◽  
C. R. Denham
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Thermal Properties ◽  
Tissue Blood Flow ◽  
Conductivity Measurements ◽  
Bioheat Equation ◽  
Tissue Conductivity ◽  
Diffusivity Measurements ◽  
Tissue Surface ◽  
Effective Thermal Properties

A microcomputer based instrument to measure effective thermal conductivity and diffusivity at the surface of a tissue has been developed. Self-heated spherical thermistors, partially embedded in an insulator, are used to simultaneously heat tissue and measure the resulting temperature rise. The temperature increase of the thermistor for a given applied power is a function of the combined thermal properties of the insulator, the thermistor, and the tissue. Once the probe is calibrated, the instrument accurately measures the thermal properties of tissue. Conductivity measurements are accurate to 2 percent and diffusivity measurements are accurate to 4 percent. A simplified bioheat equation is used which assumes the effective tissue thermal conductivity is a linear function of perfusion. Since tissue blood flow strongly affects heat transfer, the surface thermistor probe is quite sensitive to perfusion.

I23 Thermal conductivity measurements of thin films by using The 3 omega method

2008 ◽  
Vol 2008.61 (0) ◽  
pp. 291-292
Author(s):  
Makoto TAKIISHI ◽  
Saburo TANAKA ◽  
Hiroshi TSUKAMOTO ◽  
Koji MIYAZAKI
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Conductivity Measurements ◽  
Omega Method ◽  
3 Omega ◽  
3 Omega Method
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