Thermal Exchange of Glass Micro-Fibers Measured by the 3ω Technique

Richard, Jacques; Doumouro, Joris; Wilde, Yannick De; Bourgeois, Olivier

doi:10.1115/1.4047501

Cited by 9 publications

(3 citation statements)

References 48 publications

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“…For the biphasic GF composites with <30 wt % GF, was constant at ∼4%, while the composites with >30 wt % GF decreased with increasing concentration. Since the GFs used in this study are estimated to have a thermal conductivity of 1.3 W/m·K, , which is approximately 6 times higher than that of the Neat PP matrix (see Section ), the thermal conductivity of the composite would be enhanced as the concentration of GF increases. Therefore, the heat of the composite will be dissipated at a higher rate so that the polymer melt experiences a lower temperature during crystallization within the mold cavity.…”

Section: Resultsmentioning

confidence: 99%

Tailoring Multifunctional and Lightweight Hierarchical Hybrid Graphene Nanoplatelet and Glass Fiber Composites

Sansone

Razzaz

Salari

et al. 2022

ACS Appl. Mater. Interfaces

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In this work, hybrid polypropylene (PP)-based composites reinforced with graphene nanoplatelets (GnPs) and glass fiber (GF) were fabricated by injection molding to elucidate how the hybrid approach can produce synergistic effects capable of achieving properties and functionalities not possible in biphasic composites. Synergism between the reinforcements translated to improved mechanical performance, which was attributed to the chemically and/or electrostatically assembled hierarchical structure that facilitates load transfer at the interface while simultaneously tailoring the crystalline microstructure of the matrix by inducing transcrystallization and β-crystal formation. It was demonstrated that there exists an optimal concentration of 0.5 wt % GnP, producing the greatest mechanical properties and synergistic effect, corresponding to the highest degree of crystallinity (∼6% greater than Neat PP) and peak formation of β-crystals within the PP matrix. The greatest synergistic effect was found to be ∼52 and ∼39% for the specific tensile strength and flexural strength, respectively. The same optimal concentration of GnPs was found to produce the highest synergistic effect for thermal conductivity of ∼68% due to the volume exclusion effect induced by the GFs combined with the higher crystallinity of the microstructure, promoting the formation of thermally conductive pathways. Ultimately, the mechanisms contributing to the synergistic effect presented in this work can be used to maximize the performance of hybrid composite systems, giving them the potential to be tailored for a variety of high-performance industrial applications to meet the rising demands for ultra-strong, thermally conductive, and lightweight materials.

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Section: Resultsmentioning

confidence: 99%

Tailoring Multifunctional and Lightweight Hierarchical Hybrid Graphene Nanoplatelet and Glass Fiber Composites

Sansone

Razzaz

Salari

et al. 2022

ACS Appl. Mater. Interfaces

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“…This implies the definition in the volume mesh of the fiber-to-fiber contact surfaces where additional boundary conditions must be applied. The measurements done by Nguyen et al [113] will be used as input parameters.…”

Section: Discussionmentioning

confidence: 99%

Design and Thermal Conductivity of 3d Artificial Cross-Linked Random Fiber Networks

Kallel

Joulain²

2022

SSRN Journal

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“…We find the same value of R K ≈ 1.4 10 7 K.W −1 . Note that a contact resistance of a few 10 7 K.W −1 was also measured between two crossing glass micro-fibers [29]. Let's also mention that the contribution of the glue between the SThM probe and the sphere has been neglected in this analysis.…”

Section: Heat Transport Under Vacuum Conditionsmentioning

confidence: 95%

Quantitative Measurement of the Thermal Contact Resistance between a Glass Microsphere and a Plate

et al. 2021

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Accurate measurements of the thermal resistance between micro-objects made of insulating materials are complex because of their small size, low conductivity, and the presence of various ill-defined gaps. We address this issue using a modified scanning thermal microscope operating in vacuum and in air. The sphere-plate geometry is considered. Under controlled heating power, we measure the temperature on top of a glass microsphere glued to the probe as it approaches a glass plate at room temperature with nanometer accuracy. In vacuum, a jump is observed at contact. From this jump in temperature and the modeling of the thermal resistance of a sphere, the sphere-plate contact resistance RK = (1.4 ± 0.18) × 10 7 K.W −1 and effective radius r = (36 ± 4) nm are obtained. In air, the temperature on top of the sphere shows a decrease starting from a sphere-plate distance of 200 µm. A jump is also observed at contact, with a reduced amplitude. The sphere-plate coupling out of contact can be described by the resistance shape factor of a sphere in front of a plate in air, placed in a circuit involving a series and a parallel resistance that are determined by fitting the approach curve. The contact resistance in air R * K = (1.2 ± 0.46) × 10 7 K.W −1 is then estimated from the temperature jump. The method is quantitative without requiring any tedious multiple-scale numerical simulation, and is versatile to describe the coupling between micro-objects from large distances to contact in various environments.

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Thermal Exchange of Glass Micro-Fibers Measured by the 3ω Technique

Cited by 9 publications

References 48 publications

Tailoring Multifunctional and Lightweight Hierarchical Hybrid Graphene Nanoplatelet and Glass Fiber Composites

Tailoring Multifunctional and Lightweight Hierarchical Hybrid Graphene Nanoplatelet and Glass Fiber Composites

Design and Thermal Conductivity of 3d Artificial Cross-Linked Random Fiber Networks

Quantitative Measurement of the Thermal Contact Resistance between a Glass Microsphere and a Plate

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