CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Saisai Li,Wenjin Ren,Jiaxuan Xin,Can Chen,Dixin Yan,Xiaoyu Xia,Minghui Li,Ruoyu Chen
To address the challenge of preparing alumina-mullite refractory linings with complex geometries for sulfur incinerators, alumina-mullite thermal insulation refractories with controllable pore structures were fabricated using direct ink writing. This process used rice husks coated with different concentrations of alumina sol to effectively control their water absorption properties. The study explored the effects of alumina sol concentration on the rheological behavior and printability of the inks, as well as the influence of the alumina sol coating on the pore structure, phase composition, and key performance metrics (physical properties, thermal shock resistance, thermal conductivity, and acid corrosion resistance) of the final samples. Interestingly, increasing the alumina sol concentration initially decreased the viscosity and thixotropy of the ink, followed by an increased, while also affecting the shear-thinning behavior, yield stress and flow stress. Compared to refractories made with rice husk coated with a low concentration alumina sol, the presence of mullite whiskers formed in the pores left by the rice husk burnout not only mitigated the residual quartz phase issue but also enhanced the microporosity. This improvement led to increased strength, thermal insulation, and acid corrosion resistance. After heating to 1500 °C, the refractory made with rice husk coated with 15 wt% alumina sol achieved 25.8 % porosity, 73.6 MPa compressive strength, 3.21 W/m·K thermal conductivity, 85 % residual flexural strength ratio, and excellent resistance to acid corrosion. This method shows great potential for producing refractory linings with complex shapes and further enhancing material performance by optimizing the microstructure.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Yuanfang Ai,Weixi Chen,Xi Wu,Na Zheng,Longcheng Tang,Dongqi Wang,Huang Tang,Kun Cao
Intumescent flame-retardant coatings offer excellent passive fire protection for flammable materials and steel. However, a key challenge is the conflict between increased melt viscosity from additive catalyst and chemical foaming behavior. Herein, “interfacial autocatalytic” strategy-guided design of a double dopant-free epoxy coating is reported with a 100 µm boron-rich upper layer and a 300 µm phosphorus-rich bottom layer. This coating generates BPO 4 catalyst in situ at the interface during combustion, synergistically catalyzing charcoal formation with the expansion process. BPO 4 , with its better lattice arrangement, is able to form a dense ceramic layer of 5.5 µm ceramic layer from a stack of 10–40 nm nanoparticles, encapsulating an underlying 1.8 cm intumescent char layer. The coating demonstrates the superior thermal insulation with the heat-resistant time for up to 50 min, a 271% delay in ignition time, an ultra-low fire growth rate with 58% reduction, and a 33% reduction in total heat release. In addition to high transparency, this coating presents easy self-healing, good mechanical properties, and water resistance. This autocatalytic strategy in a confined space-time introduces a new method for enhancing catalytic charring flame retardancy.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xinfu Zhao,Mengqing Su,Shimo Yu,Jing Zhang,Xiaochan Liu,Kang Qiu,Xibin Yi,Jian Zhang,Guoliang Dou,Mengdi Wang
Polyimide (PI) aerogel is a good thermal insulation material with the highest temperature resistance in practical application. But the mechanical strength of PI aerogels prepared by freeze-drying or thermoimide methods is weak. In this research, TPU was selected as an aging solution to solve the problem of the low mechanical strength of PI aerogel prepared by the freeze-drying method. Previous work has certified that the coupling of PI and thermoplastic polyurethane (TPU) can enhance the mechanical strength of PI aerogel to a certain extent due to the flexibility of TPU. But excessive TPU will change the PI structure in the cross-linking process and decrease the mechanical strength of the aerogel. Thus, a new kind of PI gel modification method was provided by using TPU as an aging solution, and the mechanical strength of PI aerogel is improved to 3.06 MPa. Furthermore, the shrinkage, specific surface area, waterproof angle, and thermal conductivity all show good performance, thus enabling PI aerogel to be used in many aspects. Specially, the method is simple and can be used to prepare some other high-strength aerogels.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jinxia Li,Jianjun Chen,Jiyu Tao,Hao Chen
The cotton fiber batt is one of the most commonly used thermal insulator in our lives at room temperature because of its flexible and porous structure . The SiC nanofibers have excellent mechanical, physical, and chemical properties such as high mechanical strength and modulus, low density, high-temperature resistance, which is a promising material for high temperature structural materials or thermal insulator. In this work, a flexible SiC nanofiber batt was fabricated from the cotton fiber batt by sol-gel carbothermal reduction reaction. The fluffy carbonized porous cotton batt was used as a template for the fabrication of sponge-liked SiC nanofiber batt composed of single crystalline β-SiC fibers. It exhibits good compressive flexibility, ultra-high porosity (a specific surface area was 30.90 m²/g), excellent high-temperature stability (ranging from −196 °C in liquid nitrogen to 1300 °C under the flame of butane blowtorch) and low thermal conductivity (0.02 W/(m·K) at room temperature). The SiC nanofiber batt, which has low density, excellent high-temperature resistance and oxidation resistance , is a promising material for high-temperature structural materials or thermal insulators under extreme conditions. The facile fabrication method of SiC nanofiber batt from common cotton batt provides a novel technique for economic industrial production of high temperature thermal insulation material .
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Xin Li,Guoqing Dong,Zengwei Liu,Xuetong Zhang
Aerogel fibers with ultrahigh porosity, large specific surface area, and ultralow density have shown increasing interest due to being considered as the next generation thermal insulation fibers. However, it is still a great challenge to fabricate arbitrary aerogel fibers via the traditional wet-spinning approach due to the obvious conflict between the static sol–gel transition of the aerogel bulks and the dynamic wet-spinning process of aerogel fibers. Herein, a sol–gel confined transition (SGCT) strategy was developed for fabricating various mesoporous aerogel fibers, in which the aerogel precursor solution was first driven by the surface tension into the capillary tubes, then the gel fibers were easily formed in the confined space after static sol–gel process, and finally the mesoporous aerogel fibers were obtained via the supercritical CO2 drying process. As a typical case, the polyimide (PI) aerogel fiber prepared via the SGCT approach has exhibited a large specific surface area (up to 364 m2/g), outstanding mechanical property (with elastic modulus of 123 MPa), superior hydrophobicity (with contact angle of 153°), and excellent flexibility (with curvature radius of 200 μm). Therefore, the aerogel woven fabric made from PI aerogel fibers has possessed an excellent thermal insulation performance in a wide temperature window, even under the harsh environment. Besides, arbitrary kinds of aerogel fibers, including organic aerogel fibers, inorganic aerogel fibers, and organic–inorganic hybrid aerogel fibers, have been fabricated successfully, suggesting the universality of the SGCT strategy, which not only provides a way for developing aerogel fibers with different components but also plays an irreplaceable role in promoting the upgrading of the fiber fields.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 11
·6217-6233
·
IF 4.21
Jiang Shuai,Zhang Meiling,Li Mengmeng,Liu Liu,Liu Lifang,Yu Jianyong
Abstract Herein, a facile method on fabricating aerogels with hierarchical porous structures was created by freeze-drying the cellulose nanofibril (CNF)/methyltrimethoxysilan (MTMS)/fumed silica (FS) suspension. FS was introduced for its porous structure, which could improve the thermal insulation performance of freeze-dried aerogels. The as-prepared aerogels were hydrophobic with improved mechanical properties (elastic recovery rate was up to 99.7%) and reduced thermal conductivity (0.027 Wm −1 K −1 at 25 °C). Most importantly, the addition of FS was proved to improve the thermal insulation stability of cellulose aerogels efficiently in different values of relative humidity (RH) and temperatures. The thermal conductivity of pure CNF aerogel conditioned at 25 °C and 95% RH was 196% higher than that of the fully-dried one, while the increase was 56% for the composite aerogel. Besides, at 30% RH, the thermal conductivity increased by 24% for the pure CNF aerogel when tested from 20 to 60 °C while only a 2% increase for the composite aerogel. Moreover, when tert-butanol was used as the solvent to optimize the distribution of the pores of freeze-dried aerogels, their thermal insulation performance was further improved. Our work provides easily available CNF/MTMS/FS ternary aerogels, which are stable in thermal conductivity in the changing environment. Graphic abstract
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Chunlin Chen,Guoqing Xiao,Fei Zhong,Shaotang Dong,Zhengwei Yang,Chunyan Chen,Mingtan Wang,Rui Zou
In this study, the synergistic effect of carbon nanotubes (CNTs) and graphene oxide (GO) on the flame retardant properties of waterborne intumescent epoxy coatings was investigated. Firstly, bio-inspired polydopamine (PDA) was wrapped on the surface of CNTs to increase their water dispersibility and provide them with abundant reactive functional groups. Then, the 3-Aminopropyl triethoxysilane (KH550) was grafted on CNTs/PDA surface. Subsequently, the GO was combined with the modified CNTs by chemical reaction to obtain the GO@M-CNTs hybrids. The results showed that the composite coating with GO@M-CNTs hybrids had better fire retardant performance than the addition of CNTs or GO nanosheets alone. In contrast, the composite coating loaded with 1.5% of GO@M-CNTs hybrids exhibited the lowest backside temperature (168.2 °C), indicating its highest thermal insulation performance. Moreover, the results of the furnace storage experiments displayed that the GO@M-CNTs 1.5% /EP sample exhibited the maximum expansion height (13.7 mm) and expansion rate (10.79) due to the hybrids effectively hindering the escape of the foamed gas into the air. In addition, the GO@M-CNTs 1.5% /EP composite coating exhibited the maximum T max (370.4 °C) and char residue (28.8%) during the TGA test, which resulted in its most excellent fire retardant performance.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2024
·
IF 6.1
Guotao Wang,Lin Wang,Jian You,Yuchen Yang,Yuanze Wang,Wei Wang,Longmin Liu,Jianying Huang,Yongzhao Li,Weihe Yu,Huaiyin Chen,Yuekun Lai,Weilong Cai
Flexible thermal insulation membrane plays a key role in outdoor wear of human body and thermal management of electronic products. This study used electrospinning to prepare thermal insulation hollow silica/polytetrafluoroethylene (HSi/PTFE) fiber membranes. HSi were prepared using tetraethylorthosilicate as the silicon source and hydrothermal carbon spheres as templates. A spinning solution of PTFE containing the HSi was used to prepare fiber membranes. The heat transfer resistance of the fiber is improved by embedding HSi into the PTFE fiber, resulting to improved heat insulation capability of the fiber membrane. The influence of HSi content on the thermal insulation performance of PTFE fiber membrane was studied. When the HSi content was 5 %, the fiber membrane showed the lowest thermal conductivity (0.0197 W/(m·K)), which was not only lower than most fiber thermal insulation materials, but also had excellent tensile properties (tensile deformation capacity of 168 %), which was convenient for practical application. In addition, this kind of fiber membrane also has high hydrophobicity (water contact angle of 147°), effectively reducing the influence of moisture on thermal insulation performance. This work presents innovative prospects for the future advancement of thermal insulation materials.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Physics
·
2025
·
IF 9.7
Guodong Han,Fangyuan Qi,Song Zhao,Yuxiang Jia,Yudeng Wang,Sai Sui,Bo Feng,Jun Wang,Jiafu Wang,Shaobo Qu
The lightweight microwave absorbing materials(MAMs) have always been a research hot topics in the field of electromagnetic waves(EMWs) absorption. In this work, the pineapple peel (PA) was used as a carbon source and combined with Co alloys. The hollow porous carbon of the PA after pyrolysis provides advantage for becoming the lightweight MAMs. When the soaking time of PA-800 in the solution of CoCl 2 •6H 2 O achieves at 60 h, PA-800-60 was successfully prepared which the RL min of −24.8 dB and the EAB reach 5.8 GHz (12.2–18 GHz) at the thickness of only 1.3 mm. In order to improve the effects of impedance matching, the height of 9 mm frustum metastructure based on PA-800-60 was designed and used for improving microwave absorption in the low-frequency range. The EAB has been expanded from 5.8 GHz to 13.5 GHz (3.5–18 GHz) which covers the C, X and Ku band and the RL min reached −17.5 dB at the frequency of 7.44 GHz. Meanwhile, the RCS value of PA-800-60 layer is less than −10 dB m 2 cover the range of −60°–60° and the maximum scattering intensity is only −10 dB m 2 at the thickness of 2 mm. In addition to, the PA-800-60 exhibits superb thermal insulation performance due to abundant air with lower thermal conductivity take place of solid phase with higher thermal conductivity. This work provides a new direction for the research and development of multifunctional electromagnetic metastructures based on the lightweight MAMs.
研究领域:
电磁学
·
材料科学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 9
·1938
·
IF 3.1
Chensi Zhang,Jiangtao Li,Junpeng Jiang,Xiaoxia Hu,Shuo Yang,Kuan Wang,Anran Guo,Haiyan Du
The Applications of silica aerogel are limited due to its brittleness and low strength. As a result, it is essential to strengthen and toughen it. Organic nanofibers are one of the preferred reinforcement materials. In this work, we designed and fabricated flexible and compressible nanostructure-assembled aramid nanofiber/silica composites aerogel (ANF/SiO2aerogel) to improve the mechanical strength and flexibility of silica aerogel without compromising thermal insulation properties. The aramid nanofiber/silica composite aerogels were prepared by immersing the aramid nanofiber wet gel into the silica sol for a certain period of time followed by freeze drying without solvent replacement. The surface modifier 3-aminopropyltriethoxysilane (APTES) was used as a coupling agent to form chemical linkage between the ANF fiber and silica gel. It was observed that APTES can effectively drive the silica sol to infuse into ANF hydrogel, promoting the assembly of silica gel onto the fiber surface and a uniform distribution in the network of ANF. The compressive resilience, thermal stability, and thermal insulation properties of the composite aerogels were evaluated by inducing the silica aerogel into the ANF network to form a protective layer on the fiber and change the pore structure in the ANF network.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Zongqian Wang,Haiwei Yang,Yu Li,Xianhong Zheng
Aerogel fibers with ultrahigh porosity and ultralow density are promising candidates for personal thermal management to reduce the energy waste of heating an entire room, and play important roles in reducing energy waste in general. However, aerogel fibers generally suffer from poor mechanical properties and complicated preparation processes. Herein, we demonstrate hierarchically porous and continuous silk fibroin/graphene oxide aerogel fibers (SF/GO) with high strength, excellent radiative heating performance, and thermal insulation performance through coaxial wet spinning and freeze-drying. The hollow CA/PAA fibers prepared via a coaxial wet spinning process have multiscale porous structures, which are not only beneficial for the formation of an SF/GO aerogel core, but also help to improve the mechanical strength of the aerogel fibers. Moreover, the prepared aerogel fibers show comparable porosity and mechanical properties with those of hollow CA/PAA fibers. More importantly, GO can dramatically improve the infrared radiative heating properties, and the surface temperature is increased by 2.6 °C after exposure to infrared radiation for 30 s, greatly higher than that of hollow fiber and SF aerogel fibers. Furthermore, the integration of hierarchically porous hollow fibers and SF/GO aerogels prevents thermal convection, decreases thermal conduction, and suppresses thermal radiation, rendering the SF/GO aerogel fiber with excellent thermal insulation performance. This work may shed light on the heat transfer mechanism of the microenvironment between the human body and textiles and pave the way for the fabrication of high-performance aerogel fibers used for personal thermal management.
研究领域:
材料科学
·
纺织工程
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 41
·2302835
·
IF 13.3
Sai Wang,Chaohu Zhu,Fei Wang,Jianyong Yu,Shichao Zhang,Bin Ding
Extremely low temperature has posed huge burden on the public safety concerns and global economics, thereby calling for high-performance warmth retention materials to resist harsh environment. However, most present fibrous warmth retention materials are limited by their large fiber diameter and simple stacking structure, leading to heavy weight, weak mechanical property, and limited thermal insulation performance. Herein, an ultralight and mechanically robust polystyrene/polyurethane fibrous aerogel by direct electrospinning for warmth retention is reported. Manipulation of charge density and phase separation of charged jet allows for the direct assembly of fibrous aerogels consisting of interweaved curly wrinkled micro/nanofibers. The resultant curly wrinkled micro/nanofibrous aerogel possesses low density of 6.8 mg cm −3 and nearly full recovery from 1500-cycle deformations, exhibiting both ultralight feature and superelastic property. The aerogel also shows low thermal conductivity of 24.5 mW m −1 K −1 , making synthetic warmth retention materials superior to down feather possible. This work may shed light on developing versatile 3D micro/nanofibrous materials for environmental, biological, and energy applications.
研究领域:
材料科学
·
能源科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）