Nanomaterials
·
2024
·Vol. 14
·期 8
·722
·
IF 4.4
Zhengtang Cai,Kaipeng Zheng,Chun Ma,Yu Fang,Yuyang Ma,Qinglin Deng,Han Li
Compared to SnTe and PbTe base materials, the GeTe matrix exhibits a relatively high Seebeck coefficient and power factor but has garnered significant attention due to its poor thermal transport performance and environmental characteristics. As a typical p-type IV–VI group thermoelectric material, W-doped GeTe material can bring additional enhancement to thermoelectric performance. In this study, the introduction of W, Ge1−xWxTe (x= 0, 0.002, 0.005, 0.007, 0.01, 0.03) resulted in the presence of high-valence state atoms, providing additional charge carriers, thereby elevating the material’s power factor to a maximum PFpeakof approximately 43 μW cm−1K−2, while slightly optimizing the Seebeck coefficient of the solid solution. Moreover, W doping can induce defects and promote slight rhombohedral distortion in the crystal structure of GeTe, further reducing the lattice thermal conductivityκlatto as low as approximately 0.14 W m−1K−1(x= 0.002 at 673 K), optimizing it to approximately 85% compared to the GeTe matrix. This led to the formation of a p-type multicomponent composite thermoelectric material with ultra-low thermal conductivity. Ultimately, W doping achieves the comprehensive enhancement of the thermoelectric performance of GeTe base materials, with the peak ZT value of sample Ge0.995W0.005Te reaching approximately 0.99 at 673 K, and the average ZT optimized to 0.76 in the high-temperature range of 573–723 K, representing an increase of approximately 17% compared to pristine GeTe within the same temperature range.
研究领域:
材料科学
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能源材料
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热电材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yanfei Wang,Weiran Zhang,Jinping Du,Duan Li,Rongjun Liu
It is urgent to develop thermal barrier coating (TBC) topcoat materials with ultra-low thermal conductivities for next-generation gas turbine engines. A novel pyrochlore-based single-phased ceramic, tuned by codoping of lanthanum zirconate, (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 O 7 , has been synthesized from the solid state reaction method. The thermal conductivity of (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 O 7 not only exhibits a temperature-independent trend but also reaches as low as 0.93 W·m −1 ·K −1 , a value that is lowest of fully dense crystalline solids in open literature, attributing to the following two combined effects. The first is the strong scattering of phonons by small-sized Y 3+ cations occupying the oversized atomic cages formed by the distinctive pyrochlore structure. The second is the lattice softening effects arising from larger-sized Ce 4+ substituting Zr 4+ cations. The above two effects act in concert and thus form a glasslike and ultra-low thermal conductivity of (La 1-x Y x ) 2 (Zr 1-y Ce y ) 2 O 7 solid solutions, which is ideal for next-generation TBC topcoat applications.
研究领域:
材料科学
·
工程热物理
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2023
·
IF 3
Zhuoli Xu,Fuping Li,Yan Zhang,Sixuan Zhang,Kang Zhao,Yufei Tang
In this work, ZrB 2 /ZrC nanofiber aerogels with excellent elasticity and ultra-low thermal conductivity were prepared by electrospinning and freeze-drying. The aerogels with isotropic cellular-like pore structure were obtained with pore walls composed of graphene oxide attached with ZrB 2 /ZrC nanofibers. The aerogels showed recoverable property under 60 % compressive strain. The thermal conductivity of the aerogels was 0.029 W·m −1 ·k −1 , much lower than that of other carbide and boride aerogels. These intriguing results may offer considerable advantages for thermal insulation in extreme environments.
研究领域:
材料科学
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热绝缘材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Wenjie Li,Tianliang Pang,Hang Liu,Chen Wang,Mingwei Li,Xiaodong He,Fei He
Mullite fibers/whiskers hierarchical structure materials (MFWs) were prepared via the three-stage method, i.e. seeds breeding, precursors introducing and whiskers growth. The mechanism of low-temperature in-situ synthesis of mullite whiskers during gas-phase reaction process has been discussed in detail. The seeds bred on mullite fibers (MFs) are the growth points and can effectively reduce the subsequent growth temperature of mullite whiskers (MWs). The precursors composed of aluminum source, silicon source and catalyst provided raw materials for whiskers growth. Under the heat treatment temperature of 800 °C, mullite seed grains were guided to in-situ transform into MWs. Moreover, MFWs fabricated via low-temperature in-situ growth mechanism on the MFs present low density (0.103–0.147 g/cm 3 ) and ultralow thermal conductivity (0.0426–0.0514 W·m −1 ·K −1 ). Due to the lower whiskers growth temperature in this work than the ones in the most recent literatures, the three-stage method can be regarded as a viable strategy for low-temperature in-situ growth whiskers.
研究领域:
材料科学
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热工技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jun Wang,Qianqian Jin,Jianbo Song,Di Zhang,Bin Xu,Zhiyi Ren,Meng Wang,Shixiao Yan,Xiaoliang Sun,Chi Liu,Xiaoyu Chong,Jing Feng
The foremost objective of this work is to employ an entropy strategy to optimize the thermophysical properties of rare-earth (RE) tantalates . The stabilizing single-phase structure of seven-component rare-earth tantalates is verified by density functional theory calculations, and entropy-stabilized (7RE 1/7 )TaO 4 with a defective structure is successfully synthesized via spark plasma sintering . (7RE 1/7 )TaO 4 exhibits lower intrinsic thermal conductivity over the entire temperature range from 100 to 1200 °C. Furthermore, its intrinsic thermal conductivity (0.83–0.90 W m −1 ·K −1 ) is 39–51% and 68–71% lower compared to those of single-RE RETaO 4 and 8YSZ at 1200 °C, respectively, and is even close to the limited thermal conductivity from the Cahill model. This is the result of multiscale phonon scattering by Umklapp phonon-phonon, point defect , dislocation, ferroelastic domain and distorted structures. Moreover, (7RE 1/7 )TaO 4 exhibits superior high-temperature phase stability and excellent mechanical properties . Therefore, entropy-stabilized (7RE 1/7 )TaO 4 compounds with ultralow thermal conductivity can be used as promising thermal insulating materials .
研究领域:
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Yali Yu,Peng Zhang,Xuefei Zhang,Dan Wang,Xiangyang Liu,Wei Pan,Chunlei Wan
The hierarchical porous microsphere is a promising feedstock for thermal barrier coatings (TBCs), due to its excellent flowability, high compression strength, and high temperature structure stability. This study aims to determine the formation mechanism of the coating deposited using hierarchical porous microspheres. For the (Sm 0.2 Gd0 .2 Dy 0.2 Er 0.2 Yb 0.2 ) 2 Zr 2 O 7 hierarchical microsphere sintered at 1000 ºC to 1550 ºC, the thermal conductivity increased from 0.21 to 0.64 W/m·K, the compression strength increased from 13 MPa to 80 MPa. The hierarchical porous structure can inhibit the heat flow from the surface to interior, resulting in the low melting degree in the plasma jet. Additionally, the coatings exhibit the characteristics of nanostructured coatings and hierarchical porous zones inherited from the microspheres, as evidenced by a comparison of compression strength and impact strength during deposition. The as-sprayed nanostructured coating shows a significantly lower initial thermal conductivity of 0.33 W/m·K at 1000 ºC compared to the conventional coating.
研究领域:
材料科学
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热力学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 7
·118107
·
IF 6.2
Huimin Xiang,Jie Fan,Siyuan Huang,Yiran Li,Yuchen Liu,Wenxian Li,Yanchun Zhou,Bin Liu
Porous ceramics with ultralow thermal conductivity and robust thermal stability are critical for advanced hypersonic vehicles. However, sintering and phase transitions of these materials have been critical problems. To address these issues, herein, we report the synthesis of multicomponent (Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 )ZrO 3 powders via solid-phase reaction and subsequent fabrication of sintering-resistant porous ceramics using a particle-stabilized foaming approach. By modulating solid loading (20–40 wt%), we achieved tailorable architectures with porosity levels of 81.6–92.3 % and compressive strengths of 0.97–4.50 MPa. The optimized material demonstrates ultralow room-temperature thermal conductivity (0.086–0.150 W/(m·K)), remarkably preserved at 0.232 W/(m·K) at 1000°C. Crucially, these ceramics exhibit exceptional thermomechanical stability with < 1 % linear shrinkage after 6 h heating at 1700°C and survive 200°C-quenching thermal shocks without catastrophic structural failure. These combined properties position (Zn 0.1 Ca 0.1 Sr 0.4 Ba 0.4 )ZrO 3 porous ceramics as a promising candidate for ultrahigh-temperature insulation in aerospace and energy systems.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Yongqian Shi,Yanjun Zhu,Shan Liu,Libi Fu,Juntian Chen,Jiawen Liu,Longcheng Tang,Jiefeng Gao,Pingan Song
There is a significant increase in the demand for lightweight and compressible electromagnetic interference (EMI) shielding materials in various fields. Though MXene aerogels hold immense potential as EMI shielding materials, several shortcomings including poor water resistance, low mechanical robustness, easy oxidation, and high cost limits of their wide application. This work reported a novel strategy involving the co-assembly of MXene and cellulose nanofibers (CNF) through directional freezing and freeze-drying, followed by the capsulation-concreting of a thin layer of flame-retardant polydimethylsiloxane (PDMS) onto the aerogel, to multi-hierarchically construct a series of high-performance CNF/MXene/PDMS composite aerogels. The lightweight CNF/MXene/PDMS/MPP-Zr@PDA composite aerogel achieved ultrahigh EMI shielding effectiveness of 96.8 dB (X-band) and utilization efficiency of 1713.27 dB g g −1 . Furthermore, the PDMS coating effectively imparted excellent compressibility and durability to the 3D scaffold, resulting in a compressive strength of 17.01 kPa for the composite aerogel, representing 199.5% increase compared to CNF aerogel. Additionally, the composite aerogel exhibited outstanding flame-retardant properties (54.6% reduction in heat release rate), ultralow thermal conductivity of 0.0530 W m −1 K −1 and excellent hydrophobicity. Therefore, the durable and flame-retardant CNF/MXene/PDMS composite aerogels hold promising applications in EMI protection, thermal management, smart fire detection, and other specific fields.
研究领域:
材料科学
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化学工程
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电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Advanced Ceramics
·
2022
·Vol. 11
·期 8
·1235-1248
·
IF 11.534
Song Limeng,Fan Bingbing,Chen Yongqiang,Gao Qiancheng,Li Zhe,Wang Hailong,Zhang Xinyue,Guan Li,Li Hongxia,Zhang Rui
Multifunctionalization is the development direction of personal thermal energy regulation equipment in the future. However, it is still a huge challenge to effectively integrate multiple functionalities into one material. In this study, a simple thermochemical process was used to prepare a multifunctional SiC nanofiber aerogel spring (SiC NFAS), which exhibited ultralow density (9 mg/cm 3 ), ultralow thermal conductivity (0.029 W/(m·K) at 20 °C), excellent ablation and oxidation resistance, and a stable three-dimensional (3D) structure that composed of a large number of interlacing 3C-SiC nanofibers with diameters of 300–500 nm and lengths in tens to hundreds of microns. Furthermore, the as-prepared SiC NFAS displayed excellent mechanical properties, with a permanent deformation of only 1.3% at 20 °C after 1000 cycles. Remarkably, the SiC NFAS exhibited robust hyperelasticity and cyclic fatigue resistance at both low (∼−196 °C) and high (∼700 °C) temperatures. Due to its exceptional thermal insulation performance, the SiC NFAS can be used for personal thermal energy regulation. The results of the study conclusively show that the SiC NFAS is a multifunctional material and has potential insulation applications in both low- and high-temperature environments.
研究领域:
材料科学
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纳米技术
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 105
·期 4
·2772-2782
·
IF 3.784
De-bao Liu,Fei-fei Zhou,Li-jie Qu,Yi-guang Wang,Bao-sheng Xu,Shi-gang Ai
Porous La 2 Zr 2 O 7 ceramic aerogels (CAs) were prepared by sol-gel template method and thermal treated process. The microstructure and crystallisation behavior of the samples were systematically characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. The results indicated that the as-prepared porous La 2 Zr 2 O 7 CAs had a single-phase pyrochlore structure with typical three-dimensional (3-D) porous structure. Meanwhile, the formation mechanisms of the as-prepared porous La 2 Zr 2 O 7 CAs were investigated. At the same time, the as-prepared porous La 2 Zr 2 O 7 CAs presented an ultralow room-temperature thermal conductivity of 0.07 W/(m K), high specific surface areas of 325.17 m 2 /g, and a relatively high compressive strength of 11.95 MPa. What's more, the as-prepared porous La 2 Zr 2 O 7 CAs possessed ideal photocatalytic activities due to its high crystallinity, large surface area as well as unique 3-D porous structure. Therefore, the present work is proposing some new insight to prepare rare-earth zirconates CAs with porous structures for thermal insulation and dye degradation applications.
研究领域:
材料科学
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纳米技术
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhanfeng Li,Xibin Yi,Jia Liu,Luyi Zhu,Ruixiang Liu,Benxue Liu
The configurations of the embedded fibers within aerogel composites influence the mechanical and thermal performances significantly, rendering the composites suitable for harsh conditions. With this regard, quartz fiber preforms were designed by carding quartz fibers wool, then layer-by-layer stacking in a space-confined mold, where the fibers were pre-compressed, resulting in spring-back behavior that opposes the direction of compression. ZrO 2 -SiO 2 aerogel precursor was infiltrated into the fiber preform to form quartz fiber reinforced ZrO 2 -SiO 2 aerogel (QFZSA) composites with the assistance of vacuum impregnation, sol-gel chemistry and supercritical drying. Thanks to the spring back effect of the fiber preform, the QFZSA composite exhibits exceptional out-plane mechanical strengths; compressive and bending strengths both reached nearly 1 MPa. In addition, the layer stacking structure of the fiber preforms efficiently suppressed conductive heat transfer as well as radiative heat transfer, endowing ultra-low thermal conductivities of 0.036 W m -1 K -1 and 0.070 W m -1 K -1 at 1000 ºC and 1200 ºC, respectively. The densities of the QFZSA composites with varying fiber volume fractions were in the range of 0.16-0.24 g cm -3 . X-ray computed tomography provided comprehensive characterization of the QFZSA composites, including fiber configuration, fiber volume fraction, interfacial area, and defect volume fraction, among others, which are important parameters governing composite properties. The as-prepared QFZSA composites are capable of finding applications in many leading-edge thermal protection fields.
研究领域:
材料科学
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航空工程
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热工学
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复合材料
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2023
·Vol. 14
·期 1
·1-8
·
IF 16.6
Liu Yijie,Wang Xiaodong,Hou Shuaihang,Wu Zuoxu,Wang Jian,Mao Jun,Zhang Qian,Liu Zhiguo,Cao Feng
Flexible thermoelectric generators can power wearable electronics by harvesting body heat. However, existing thermoelectric materials rarely realize high flexibility and output properties simultaneously. Here we present a facile, cost-effective, and scalable two-step impregnation method for fabricating a three-dimensional thermoelectric network with excellent elasticity and superior thermoelectric performance. The reticular construction endows this material with ultra-light weight (0.28 g cm −3 ), ultra-low thermal conductivity (0.04 W m −1 K −1 ), moderate softness (0.03 MPa), and high elongation (>100%). The obtained network-based flexible thermoelectric generator achieves a pretty high output power of 4 μW cm −2 , even comparable to state-of-the-art bulk-based flexible thermoelectric generators.
研究领域:
材料科学
·
热电学
·
可穿戴电子
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）