Radially oriented functional thermal materials prepared by flow field-driven self-assembly strategy

Zhang, Xinfeng; Xie, Bin; Zhou, Shuling; Yang, Xuan; Fan, Yiwen; Hu, Run; Luo, Xiaobing

doi:10.1016/j.nanoen.2022.107986

Cited by 23 publications

(10 citation statements)

References 43 publications

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“…The corresponding rotated angle α can be transformed to the oriented angle of the whole fillers ( σ , the angle between the ORID and the vertical direction) as shown in Figure S2. The detailed processing procedure (Figure 4) is illustrated with schematic images as follow (the images are derived from the reference [ 45 ] , where the fillers are CFs): Initialization of image. First, the contrast of the image is adjusted to amplify the brightness difference between different locations.…”

Section: Methodsmentioning

confidence: 99%

“…The tremendous improvement was attributed to the excellent alignment of CFs. Figure 8A, C show the SEM image of the Ra/0.45/5‐composite and Ra/0.22/7‐composite, which were prepared in reference [ 45 ] . The VOM algorithm was applied to calculate the ORI and find the ORID.…”

Section: Applicationmentioning

confidence: 99%

Section: Applicationmentioning

confidence: 99%

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Quantitively evaluation of fillers' alignment for targeted manufacturing of functional composite materials

Zhang,

Ye,

Yang

et al. 2023

Polymer Composites

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Filler‐reinforced composite materials are widely used in numerous domains such as energy, optoelectronics, chemistry, and so forth, owing to their versatile microstructures, excellent properties, and low fabrication cost. By finely regulating the distribution and orientation of fillers in the base material, composite materials with fantastic thermal, chemical, and mechanical properties have been demonstrated, which are also known as “metamaterials”. For the anisotropic fillers, the orientation of fillers is crucial for designing and predicting the properties of composite materials. However, accurate and efficient evaluation of fillers' orientation remains a challenge, which severely hinders the microstructural design and topological optimization of composite materials. To solve this problem, a bidirectional pixel‐traversal method which combines with microscopic image processing was developed to evaluate the orientation of fillers in composite materials. Specifically, a vertical orientation maximization algorithm was designed to evaluate the oriented degree and oriented direction of the whole fillers, and a crossing traversal algorithm was designed to evaluate the oriented angle of individual filler. Further, this method was applied to the evaluation of microscopic images from different researches. The evaluated results show a high accuracy (average error is less than 2%) and wide applicability in the evaluation of different types of fillers. This method reveals the underlying relationship between microscopic filler orientation and macroscopic composites properties, which paves a new way for the direct optimization and processing of composite materials.

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Section: Methodsmentioning

confidence: 99%

Section: Applicationmentioning

confidence: 99%

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Quantitively evaluation of fillers' alignment for targeted manufacturing of functional composite materials

Zhang,

Ye,

Yang

et al. 2023

Polymer Composites

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“…Thus, new polymer‐based structures, and hybrid materials, with enhanced thermal conductivity are in high demand. [ 5,6 ] Among the different approaches for increasing polymers' thermal conductivity, adding thermally conductive fillers to the polymer matrix is the most effective method. Nonetheless, achieving high thermal conductivity in most cases needs high filler content, which can be problematic for processability.…”

Section: Introductionmentioning

confidence: 99%

Bridging a Gap in Thermal Conductivity and Heat Transfer in Hybrid Fibers and Yarns via Polyimide and Silicon Nitride Composites

Moradi

Szewczyk

Stachewicz

2023

Small

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The pressing issues of the energy crisis and rapid electronics development have sparked a growing interest in the production of highly thermally conductive polymer composites. Due to the challenges related to the poor processability of hybrid materials and filler distribution to achieve high thermal conductivity, electrospinning is employed to create composite nanofibers and yarns using polyimide (PI) and thermally conductive silicon nitride (SiN) nanoparticles. The thermal performance of the individual nanofibers is evaluated using scanning thermal microscopy (SThM), providing significant insights into their heat transfer performance. Next, the nanofibers are applied as coatings on resistance wires to assess the thermal conductivity and insulation properties. Notably, the samples containing 35 wt.% of SiN exhibit a 25% increase in surface temperature. These innovative materials hold great promise as exceptional candidates for smart textiles and thermal management applications, addressing the growing demand for effective heat dissipation and regulation.

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“…Manipulating interfacial heat transfer across soft/hard material interfaces plays an undisputed role in the development of electronic packaging, thermal storage, sensors, and medicine. − Large thermal resistance at soft/hard material interfaces is one of the most important bottlenecks, which favors the degradation of thermal properties. , The interfacial thermal resistance (ITR) is mainly determined by the phonon vibrational match of the materials that make up the interface . However, the phonon spectra of soft/hard material interfaces typically have large mismatches due to distinct compositions and bond natures.…”

mentioning

confidence: 99%

Can Adhesion Energy Optimize Interface Thermal Resistance at a Soft/Hard Material Interface?

Cheng

Zhou

et al. 2023

Nano Lett.

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Thermal resistance at a soft/hard material interface plays an undisputed role in the development of electronic packaging, sensors, and medicine. Adhesion energy and phonon spectra match are two crucial parameters in determining the interfacial thermal resistance (ITR), but it is difficult to simultaneously achieve these two parameters in one system to reduce the ITR at the soft/hard material interface. Here, we report a design of an elastomer composite consisting of a polyurethane−thioctic acid copolymer and microscale spherical aluminum, which exhibits both high phonon spectra match and high adhesion energy (>1000 J/m 2 ) with hard materials, thus leading to a low ITR of 0.03 mm 2 •K/W. We further develop a quantitative physically based model connecting the adhesion energy and ITR, revealing the key role the adhesion energy plays. This work serves to engineer the ITR at the soft/hard material interface from the aspect of adhesion energy, which will prompt a paradigm shift in the development of interface science.

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Radially oriented functional thermal materials prepared by flow field-driven self-assembly strategy

Cited by 23 publications

References 43 publications

Quantitively evaluation of fillers' alignment for targeted manufacturing of functional composite materials

Quantitively evaluation of fillers' alignment for targeted manufacturing of functional composite materials

Bridging a Gap in Thermal Conductivity and Heat Transfer in Hybrid Fibers and Yarns via Polyimide and Silicon Nitride Composites

Can Adhesion Energy Optimize Interface Thermal Resistance at a Soft/Hard Material Interface?

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