ACS Nano
·
2023
·
IF 17.1
Xuan Zhang,Jianyong Yu,Cunyi Zhao,Yang Si
SiC is an exceptionally competitive material for porous ceramics owing to its excellent high-temperature mechanical stability. However, SiC porous ceramics suffer from serious structural damage and mechanical degradation under thermal shock due to the hard SiC microstructure and weak bonding networks. Here, we report a scalable interface-engineering protocol to reliably assemble flexible amorphous SiC nanofibers into lamellar cellular meta-aerogels by designing a covalent heterointerface. This approach allows the construction of a strong binding architecture within the resilient nanofiber skeleton network, thereby achieving structurally stable, mechanically robust, and durable SiC porous ceramics. The optimized amorphous SiC meta-aerogels (a-SiC MAs) exhibit the integrated properties of ultralight with a density of 4.84 mg cm–3, temperature-invariant superelastic, fatigue-resistant at low 5% permanent deformation after 1000 cycles of compression, and ultralow thermal conductivity (19 mW m–1 K–1). These characteristics provide a-SiC MAs potential application value in the thermal protection field.
研究领域:
材料科学
·
机械工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Nano Energy
·
2022
·
IF 19.069
Xinfeng Zhang,Bin Xie,Shuling Zhou,Xuan Yang,Yiwen Fan,Run Hu,Xiaobing Luo
Filler-reinforced polymer composites are widely applied in thermal management field on account of their promising heat transport ability, superior flexibility and excellent durability. Inside these composites, thermally conductive fillers are usually uniformly distributed or unidirectionally oriented in polymer matrix to improve thermal performances. However, the ever-shrinking and spatially distributed heat sources in three-dimensional, high-density packaged electronic devices have created the localized “hotspot” problem, which raises a new challenge and stricter requirement for the composite thermal materials. Inspired by the amazing radial microstructures in ginkgo leaf, we proposed a flow field-driven self-assembly strategy to fabricate functional thermal materials with radially oriented carbon fibers (CFs). To quantitively evaluate the orientation, an orientation algorithm based on microscale image identification was developed, and an evaluation criterion was proposed. The underlying orientation mechanisms of fillers under the driving of flow field were revealed by visual simulation of vacuum filtration. Thanks to the well-oriented fillers architecture, the composites demonstrated an ultrahigh in-plane thermal conductivity of 35.5 W/(m∙K) with a thermal conductivity anisotropy of 19.8, which enables rapid and efficient heat dissipation pathways towards localized hotspots. In addition, this flow field-driven self-assembly strategy provides a promising self-design ability that is expected to solve the heat dissipation of arbitrary-shape heat sources, and shed light on other application scenarios like efficient solar-thermal-electric conversion.
研究领域:
材料科学
·
热管理工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Bingying Gao,Jinyao Cao,Chao Yao,Linqiang Mao
Advanced aerogel materials with lightweight, flame retardant, and rapid cooling properties are urgently needed as thermal insulators in harsh environments. Herein, Cr 2 O 3 − Al 2 O 3 aerogels (CrAAs) were fabricated through a simple method and an ambient pressure drying process. A large number of pores were produced in the microstructure of the sample by the carbonization of soluble starch during calcination. The porous structure decreases the density of the prepared CrAA (Cr 2 O 3 − Al 2 O 3 aerogel) to as low as 0.143 g cm −3 , and increases the thermal conductivity to as high as 0.125 W m −1 K −1 , indicating the good thermal dissipation and rapid cooling performance of the sample. The prepared CrAAs possess a variety of composite properties such as good flame retardancy, rapid cooling, and colour restore after flame is extinguished. Moreover, after being subjected to flame treatment at ∼ 1300 °C using a butane blowtorch for 5 min, the CrAAs can be rapidly cooled to about 39.2 °C in about 1–2 min. The mechanism of the rapid cooling property was herein analysed, and we anticipate the potential application of CrAAs in flame–retardant cooling coatings.
研究领域:
材料科学
·
热工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Yanjun Chen,Zhaoqi Zhu,Min Li,Jia Zhang,Xiaoyin Cao,Ruijuan Fu,Guoyu Xing,Hanxue Sun,Jiyan Li,An Li
Aerogels have been widely studied in the field of thermal insulation. Herein, we reported a kind of conjugated micropolymer (CMP) aerogel synthesized by 1,3,5-triethynylbenzene and 2-amino-3,5-dibromopyridine. To enhance the flame-retardant property, we composited hydroxyapatite (HAP) nanowires with a CMP aerogel. Transmission electron microscopy (TEM) analysis revealed that HAP nanowires were encapsulated within nanosized CMP tubes. In addition, the thermal conductivity of HAP2-NCMP aerogel was 0.0251 W m–1 K–1, which possesses good thermal insulation property. In the micro-combustion calorimeter (MCC) test, compared with pure NCMP, the peak heat release rate (pHRR) of HAP2-NCMP decreased from 39.3 to 30.82 W g–1, approximately 21.6% lower. Furthermore, with the increased addition of hydroxyapatite in the HAP-NCMP composite, the pHRR of HAP3-NCMP decreased by about 37.4%. Besides, NCMP possesses good mechanical properties, with a compressive strength of 117.3 kPa at a strain level of 60%. These findings suggest promising application potential for HAP-NCMP in energy-saving and flame-retardant applications.
研究领域:
材料科学
·
纳米技术
·
热工程
·
消防安全工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Jiyan Li,Yong Long,Yanju Jing,Jiaqing Zhang,Silu Du,Rui Jiao,Hanxue Sun,Zhaoqi Zhu,Weidong Liang,An Li
The development of efficient solar photothermal conversion and energy storage composite (SPCSC) is of great significance in solving the imbalance between supply and demand of solar energy utilization in time and space. Herein, we prepare multi-shell hollow spheres by selecting glucose as the template and magnesium carbonate trihydrate (MgCO 3 ·3H 2 O) and chloroplatinic acid hexahydrate (H 2 PtCl 6 ·6H 2 O) as raw materials by hydrothermal-calcination method. Octadecylamine (ODA) is loaded into MSHS by vacuum impregnation to prepare SPCSC with excellent comprehensive properties (MSHS@ODA). The multi-layer hollow microspheres provide the micro-nano space structure for ODA, enhance the heat transfer rate of MSHS@ODA, effectively solve the leakage problem, and enable MSHS@ODA to have a fast photothermal response. MSHS@ODA possesses a high light absorption (75.5%), thermal conductivity (0.35 W·m −1 ·K −1 ), and photothermal conversion. The phase change enthalpy can reach 130.7 J·g −1 and maintain a high energy storage density during 100 cyclic phase change tests. Specifically, MSHS@ODA decreases the operating temperature of lithium-ion batteries by 8 °C during discharge, ensuring their stable operation within the optimal temperature range. Based on the above merits, MSHS@ODA may find useful applications in solar thermal storage and effectively managing the thermal conditions of lithium-ion batteries.
研究领域:
材料科学
·
储能
·
太阳能
·
热管理
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 16
·期 3
·1135-1146
·
IF 6.7
Wei Cheng,Wenling Jiao,Yifan Fei,Zaihui Yang,Xiaohua Zhang,Fan Wu,Yitao Liu,Xia Yin,Bin Ding
The design of three-dimensional ceramic nanofibrous materials with high-temperature insulation and flame-retardant characteristics is of significant interest due to the effectively improved mechanical properties. However, achieving a pure ceramic monolith with ultra-low density, high elasticity and toughness remains a great challenge. Herein, a low-cost, scalable strategy to fabricate ultralight and mechanically robust N-doped TiO2 ceramic nanofibrous sponges with a continuous stratified structure by conjugate electrospinning is reported. Remarkably, the introduction of dopamine into the precursor nanofibers is engineered, which realizes the nitrogen doping to inhibit the TiO2 grain growth, endowing single nanofibers with a smoother, less defective surface. Besides, the self-polymerization process of dopamine allows the construction of bonding points between nanofibers and optimizes the distribution of inorganic micelles on polymer templates. Moreover, a rotating disk receiving device under different rotating speeds is designed to obtain N-doped TiO2 sponges with various interlamellar spacings, further affecting the maximum compressive deformation capacity. The resulting ceramic sponges, consisting of fluffy crosslinked nanofiber layers, possess low densities of 12–45 mg cm−3, which can quickly recover under a large strain of 80% and have only 9.2% plastic deformation after 100 compression cycles. In addition, the sponge also exhibits a temperature-invariant superelasticity at 25–800 °C and a low heat conductivity of 0.0285 W m−1 K−1, with an outstanding thermal insulation property, making it an ideal insulation material for high-temperature or harsh conditions.
研究领域:
材料科学
·
纳米技术
·
陶瓷
·
热工程
✓ 已验证
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-13
·
IF 12.121
Jia Chao,Li Lei,Liu Ying,Fang Ben,Ding He,Song Jianan,Liu Yibo,Xiang Kejia,Lin Sen,Li Ziwei,Si Wenjie,Li Bo,Sheng Xing,Wang Dongze,Wei Xiaoding,Wu Hui
Advanced ceramic sponge materials with temperature-invariant high compressibility are urgently needed as thermal insulators, energy absorbers, catalyst carriers, and high temperature air filters. However, the application of ceramic sponge materials is severely limited due to their complex preparation process. Here, we present a facile method for large-scale fabrication of highly compressible, temperature resistant SiO 2 -Al 2 O 3 composite ceramic sponges by blow spinning and subsequent calcination. We successfully produce anisotropic lamellar ceramic sponges with numerous stacked microfiber layers and density as low as 10 mg cm −3 . The anisotropic lamellar ceramic sponges exhibit high compression fatigue resistance, strain-independent zero Poisson’s ratio, robust fire resistance, temperature-invariant compression resilience from −196 to 1000 °C, and excellent thermal insulation with a thermal conductivity as low as 0.034 W m −1 K −1 . In addition, the lamellar structure also endows the ceramic sponges with excellent sound absorption properties, representing a promising alternative to existing thermal insulation and acoustic absorption materials.
研究领域:
材料科学
·
陶瓷工程
·
热绝缘
·
声吸收
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Jing Men,Junzong Feng,Yonggang Jiang,Liangjun Li,Yijie Hu,Jian Feng
As a promising high-temperature thermal insulation, carbon aerogel is generally prepared by the carbonization of an organic aerogel. However, the preparation processes of solvent exchange and supercritical drying are complicated and contaminated, which hinder their large-scale production and application in the field of civil high-temperature thermal insulators. Herein, the nanoporous carbon aerogels were prepared by an environmentally friendly method of ambient pressure drying without solvent exchange with the usage of water as the solvent, acetic acid as an acid catalyst, and biopolymer chitosan as a cross-linking agent and supporting template. Through the polymerization and hydrogen bonds of chitosan with precursors to strengthen the gel network, carbon aerogels exhibit good monolithic shape (130 × 130 × 18 mm) with nanoparticle size (43–107 nm) and low density (0.187–0.395 g/cm3), leading to a low thermal conductivity (0.09592 W/m·K) and high compressive strength (11.50 MPa) at the density of 0.395 g/cm3. Notably, by the copyrolysis of organic fiber-reinforced organic aerogel composite, a crack-free carbon aerogel composite (0.244 g/cm3) was prepared with enhanced mechanical properties (compressive strength of 1.63 MPa at 10% strain and bending strength of 4.27 MPa) and low thermal conductivity (0.107 W/m·K at 1100 °C). This work may provide an environmentally friendly method for the industrialized preparation of reliable nanoporous carbon aerogels for high-temperature thermal protection components.
研究领域:
材料科学
·
化学工程
·
环境科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2019
·Vol. 69
·期 2
·140-148
·
IF 2.433
Jianhua Zhou,Jiaojiao Zhao,Yanjiao Cui,Wenjing Cheng
A novel kind of bifunctional nanoencapsulated phase change material with thermal energy storage and ultraviolet absorption functions was successfully prepared through surfactant-free emulsion polymerization with reactive emulsifiers. These nanocapsules consisted of n-octadecane and n-butyl stearate as binary core materials and polyacrylate supplemented with titanium dioxide nanoparticles (nano-TiO2) as hybrid shell materials. The experimental results show that the monomer conversion and thermal conductivity increased and the particle size and distribution decreased with increase in nano-TiO2 content when the nano-TiO2 dosage was below 0.2 wt%. Fourier transform infrared spectroscopy and XRD confirmed that the binary phase change materials were well encapsulated inside the polyacrylate-TiO2 hybrid shell and nano-TiO2 was also successfully crosslinked in the nanocapsules. TEM demonstrated that the synthesized nanocapsules exhibited a regular spherical profile and a well-defined core–shell structure with diameter ranging from 70 to 100 nm. In addition, the results obtained from DSC, TGA and UV–visible spectrophotometry showed that the as-prepared nanocapsules had good thermal storage capacity, thermal stability and ultraviolet absorption properties. It can be considered that the resultant nanoencapsulated phase change materials with polyacrylate-TiO2 hybrid shell may have high feasibility and hold good promise in the applications of intelligent thermoregulation fabrics. © 2019 Society of Chemical Industry
研究领域:
材料科学
·
纳米技术
·
热能存储
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）