Biomorphic Cellular Silicon Carbide Nanocrystal-Based Ceramics Derived from Wood for Use as Thermally Stable and Lightweight Structural Materials

Zhang, Jianfei; Zhou, Xin‐Mao; Huang, Xin; Lei, Hao; Zhi, Qiang; Li, Zixuan; Hou, Baoqiang; Yang, Jianfeng; Wang, Bo; Ishizaki, Kōzō

doi:10.1021/acsanm.9b01550

Cited by 19 publications

(8 citation statements)

References 53 publications

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“…The uniform distribution and fully dense directional columnar SiC nanocrystals on the cell wall are clearly visible. According to our previous research, [ 54 ] the width and length of SiC nanocrystals are ≈200 and ≈700 nm, respectively. The microstructure inherits the original structural directionality of the cellulose nanofibers of natural wood, [ 55 ] indicating that the bioSiC ceramics were synthesized by the in situ carbothermal reduction.…”

Section: Resultsmentioning

confidence: 94%

Wood‐Derived, Vertically Aligned, and Densely Interconnected 3D SiC Frameworks for Anisotropically Highly Thermoconductive Polymer Composites

Zhou

Wang

et al. 2022

Advanced Science

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Construction of a vertically aligned and densely interconnected ordered 3Dfiller framework in a polymer matrix is a challenge to attain significant thermal conductivity (TC) enhancement efficiency. Fortunately, many biomaterials with unique microstructures can be found in nature. With inspiration from wood, artificial composites can be rationally designed to achieve desired properties. Herein, the authors report a facile and effective approach to fabricate anisotropic polymer composites by biotemplate ceramization technology and subsequent vacuum impregnation of epoxy resin. The hierarchical microstructure of wood is perfectly replicated in the cellular biomass derived SiC (bioSiC) framework by carbothermal reduction. Owing to the anisotropic architecture of bioSiC, the epoxy composite with vertically aligned dense SiC microchannels shows interesting properties, including a high TC (10.27 W m −1 K −1 ), a significant enhancement efficiency (259 per 1 vol% loading), an outstanding anisotropic TC ratio (5.77), an extremely low coefficient of linear thermal expansion (12.23 ppm K −1 ), a high flexural strength (222 MPa), and an excellent flame resistance. These results demonstrate that this approach is expected to open a new avenue for design and preparation of high performance thermal management materials to address the heat dissipation of modern electronics.

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Section: Resultsmentioning

confidence: 94%

Wood‐Derived, Vertically Aligned, and Densely Interconnected 3D SiC Frameworks for Anisotropically Highly Thermoconductive Polymer Composites

Zhou

Wang

et al. 2022

Advanced Science

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“…However, high-performance wood-derived ceramics can only be achieved when the wood tissue is totally converted into the ceramic phase [21]. Vapor-phase infiltration by utilizing a solid-vapor reaction between the bio-carbon template and silicon-containing gaseous is an effective strategy for fabricating biomorphic wood-derived SiC ceramics with nanocrystalline structures [15,[22][23][24].…”

Section: Introduction mentioning

confidence: 99%

Anisotropic, biomorphic cellular Si3N4 ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

Zhou

Zhi

et al. 2022

J Adv Ceram

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Inspired by the transport behavior of water and ions through the aligned channels in trees, we demonstrate a facile, scalable approach for constructing biomorphic cellular Si3N4 ceramic frameworks with well-aligned nanowhisker arrays on the surface of directionally aligned microchannel alignments. Through a facile Y(NO3)3 solution infiltration into wood-derived carbon preforms and subsequent heat treatment, we can faultlessly duplicate the anisotropic wood architectures into free-standing bulk porous Si3N4 ceramics. Firstly, α-Si3N4 microchannels were synthesized on the surface of CB-templates via carbothermal reduction nitridation (CRN). And then, homogeneous distributed Y−Si−O−N liquid phase on the walls of microchannel facilitated the anisotropic β-Si3N4 grain growth to form nanowhisker arrays. The dense aligned microchannels with low-tortuosity enable excellent load carrying capacity and thermal conduction through the entire materials. As a result, the porous Si3N4 ceramics exhibited an outstanding thermal conductivity (TC, kR ≈ 6.26 W·m−1·K−1), a superior flexural strength (σL ≈ 29.4 MPa), and a relative high anisotropic ratio of TC (kR/kL = 4.1). The orientation dependence of the microstructure-property relations may offer a promising perspective for the fabrication of multifunctional ceramics.

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“…Microstructural modification is central to the development of random heterogeneous materials, including a wide range of composites, ceramics, and copolymers, which are the most consumed materials for various applications. , The complex microstructure resulting from the random distribution of phases or different material domains , in random heterogeneous materials is known to govern the mechanical, , thermal, , optical, and electrical , properties. Altering the randomized microstructure, commonly at the nano-scale, has been the primary approach to engineering high-performance random heterogeneous materials.…”

Section: Introductionmentioning

confidence: 99%

Revealing Microstructural Modifications of Graphene Oxide-Modified Cement via Deep Learning and Nanoporosity Mapping: Implications for Structural Materials’ Performance

Wang

Chen

Duan

et al. 2022

ACS Appl. Nano Mater.

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Locating, characterizing, and understanding the microstructural nanomodifications of random heterogeneous materials are critical to improve their performance, but current methods are limited by the material’s highly disordered microstructure. Here, we proposed a scheme to reveal the hidden microstructural modifications by coupling large-scale nanoporosity mappings with deep learning and demonstrated its effectiveness on nanomaterial (graphene oxide, GO)-modified cement. This deep learning-based approach showed superior abilities in distinguishing the nanomodified samples. The deep learning-approach shows a classification accuracy of 88.8% using nanoporosity mapping with micro-scale features. When nano-scale features were included, the classification accuracy further increased to 98%, indicating the GO modifications in the nano-scale. The microstructural changes in nano and micro scales were also located, providing the first direct evidence of a localized modification effect of GO where a small proportion (3.6–5.4%) of characteristic regions contribute up to 70% of total relevance. The effect of GO on spatial heterogeneity was also revealed by the changes in characteristic lengths. Besides, the reduced fraction of shared pore structural patterns from 44.6 to 40.9% under a high dosage of GO (0.02 wt %) also indicated the nanomodification effect of GO in improving structural topological efficiency. This study not only provides insights into the GO-modified cement for structural applications but also promotes the development of other random heterogeneous materials for a wide range of applications such as load-bearing, thermal and electrical insulation, catalyst support, and so on.

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Biomorphic Cellular Silicon Carbide Nanocrystal-Based Ceramics Derived from Wood for Use as Thermally Stable and Lightweight Structural Materials

Cited by 19 publications

References 53 publications

Wood‐Derived, Vertically Aligned, and Densely Interconnected 3D SiC Frameworks for Anisotropically Highly Thermoconductive Polymer Composites

Wood‐Derived, Vertically Aligned, and Densely Interconnected 3D SiC Frameworks for Anisotropically Highly Thermoconductive Polymer Composites

Anisotropic, biomorphic cellular Si3N4 ceramics with directional well-aligned nanowhisker arrays based on wood-mimetic architectures

Revealing Microstructural Modifications of Graphene Oxide-Modified Cement via Deep Learning and Nanoporosity Mapping: Implications for Structural Materials’ Performance

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