Raman Spectroscopy-Based Investigation of Thermal Conductivity of Stressed Silicon Microcantilevers

Gan, Mengyu; Samvedi, Vikas; Tomar, Vikas

doi:10.2514/1.t4491

Cited by 15 publications

(8 citation statements)

References 102 publications

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“…Hare et al 3 used a combined effect of temperature and pressure to Raman shift, providing an estimate of shock pressure and temperature in thin PMMA films under ablation heating. The work of Gan et al 47 – 49 suggests that the effects of temperature and stress on Raman shift can be assumed independent of each other under isothermal conditions. The work of Zhang et al 50 – 54 separated the effects of stress and temperature on Raman shift by calibration of peak width with temperature.…”

Section: Experiments Methodsmentioning

confidence: 99%

Thermo-mechanical behavior measurement of polymer-bonded sugar under shock compression using in-situ time-resolved Raman spectroscopy

Dhiman

Lewis

Olokun

et al. 2022

Sci Rep

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Quantitative information regarding the local behavior of interfaces in an inhomogeneous material during shock loading is limited due to challenges associated with time and spatial resolution. This paper reports the development of a novel method for in-situ measurement of the thermo-mechanical response of polymer bonded sugar composite where measurements are performed during propagagtion of shock wave in sucrose crystal through polydimethylsiloxane binder. The time-resolved measurements were performed with 5 ns resolution providing an estimation on local pressure, temperature, strain rate, and local shock viscosity. The experiments were performed at two different impact velocities to induce shock pressure of 4.26 GPa and 2.22 GPa and strain rate greater than 106/s. The results show the solid to the liquid phase transition of sucrose under shock compression. The results are discussed with the help of fractography analyses of sucrose crystal in order to obtain insights into the underlying heat generation mechanism.

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Section: Experiments Methodsmentioning

confidence: 99%

Thermo-mechanical behavior measurement of polymer-bonded sugar under shock compression using in-situ time-resolved Raman spectroscopy

Dhiman

Lewis

Olokun

et al. 2022

Sci Rep

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“…Equilibrium Molecular Dynamics calculations by Li et al on thermal conductivity of silicon NWs as a function of strain reveal higher thermal conductivity under compressive strain and lower thermal conductivity under tensile strain as compared to the unstrained one. [37][38][39] In addition, surface roughness causes more boundary scattering which greatly reduces the thermal conductivity of the silicon NW. 40 Therefore, the small discrepancy in our thermal conductivity could be due to the existence of compressive strain on the silicon NW.…”

Section: ∆>mentioning

confidence: 99%

Thermal conductivity of free-standing silicon nanowire using Raman spectroscopy

Sahoo¹,

Mallik²,

Sahu³

et al. 2020

Nanotechnology

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Low dimensional systems, nanowires (NWs), in particular, have exhibited excellent optical and electronic properties. Understanding the thermal properties in semiconductor NWs is very important for their applications in electronic devices. In the present study, the thermal conductivity of a freestanding silicon NW is estimated by employing Raman spectroscopy. The advantage of this technique is that the excitation source (laser) acts as both the heater and probe. The variations of the first-order Raman peak position of the freestanding silicon NW with respect to temperature and laser power are recorded. From the analysis of effective laser power absorbed by exposed silicon NW and a detailed Raman study along with the concept of longitudinal heat distribution in silicon NW, the thermal conductivity of the freestanding silicon NW of ∼112 nm diameter is estimated to be ∼53 W m−1 K− 1.

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“…Tomar and co-workers have developed the mechanical Raman spectroscopy that directly measures stresses in the material without using a constitutive model. 23,24 Several previous works 23,24 py for stress measurement without constitutive models under quasi-static loading conditions in different materials by comparing the results with constitutive model-based predictions.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, there is a strong demand to develop an in situ measurement of the dynamic polymorphic transformation of the drug substance throughout the tableting process. Tomar and co-workers have developed the mechanical Raman spectroscopy that directly measures stresses in the material without using a constitutive model. , Several previous works , have established the robustness and repeatability of mechanical Raman spectroscopy for stress measurement without constitutive models under quasi-static loading conditions in different materials by comparing the results with constitutive model-based predictions.…”

Section: Introductionmentioning

confidence: 99%

Understanding Dynamics of Polymorphic Conversion during the Tableting Process Using In Situ Mechanical Raman Spectroscopy

et al. 2020

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The objective of this study is to achieve a fundamental understanding of polymorphic interconversion during the tableting process, including during compaction, dwell, decompression/unloading, and ejection using an in situ mechanical Raman spectroscopy. The fit-for-purpose in situ mechanical Raman spectroscopy developed herein can provide simultaneous measurement of Raman spectra and densification for the powder compacts. Chlorpropamide (CPA), an antidiabetic drug, was selected as a model pharmaceutical compound because of its mechanical shear-induced polymorphic conversions. The results confirm that CPA polymorph A (CPA-A) was transformed to CPA polymorph C (CPA-C) under different compaction stresses. We also observed that the converted polymorph CPA-C could be reverted to the CPA-A due to the elastic recovery of powder compacts as detected during dwelling and unloading. This study is the first depiction of the dynamics of CPA polymorphic interconversion during compression, dwell, unloading, and ejection. Mechanistically, this study illustrates a correlation between the change in the powder compact’s relative density and polymorphic interconversion of the drug substance in different solid-state forms. The present research suggests that the process-induced polymorph conversion is a complicated dynamic process, which could be affected by the compaction pressure, the elasticity/plasticity of the material, the level of elastic recovery, and the dissipation of residual stress. In summary, this study demonstrates that the in situ mechanical Raman spectroscopy approach enables the simultaneous detection of mechanical and chemical information of the powder compact throughout the tableting process.

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Raman Spectroscopy-Based Investigation of Thermal Conductivity of Stressed Silicon Microcantilevers

Cited by 15 publications

References 102 publications

Thermo-mechanical behavior measurement of polymer-bonded sugar under shock compression using in-situ time-resolved Raman spectroscopy

Thermo-mechanical behavior measurement of polymer-bonded sugar under shock compression using in-situ time-resolved Raman spectroscopy

Thermal conductivity of free-standing silicon nanowire using Raman spectroscopy

Understanding Dynamics of Polymorphic Conversion during the Tableting Process Using In Situ Mechanical Raman Spectroscopy

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