JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 10
·6279-6291
·
IF 3.9
Saisai Zhu,Jinpeng Zhu,Songbo Ye,Kaijun Yang,Mingliang Li,Hailong Wang,Jilin He
High-entropy single-phase rare earth titanates (RE 0.2 Gd 0.2 Ho 0.2 Er 0.2 Yb 0.2 ) 2 Ti 2 O 7 (RE = Sm, Y, Lu) were designed and synthesized successfully, in which their lattice distortion was quantitatively described by mass disorder and size disorder. It is worth mentioning that (Y 0.2 Gd 0.2 Ho 0.2 Er 0.2 Yb 0.2 ) 2 Ti 2 O 7 could obtain the low thermal conductivity (1.51 W·m −1 ·K −1 , 1500°C), high thermal expansion coefficient (average, 11.69×10 −6 K −1 , RT ∼1500°C) and excellent high-temperature stability. In addition, the relationship between the microstructure and thermal transport behaviors has been studied at the atomic scale. Due to the disorder of A-site ions, severe lattice distortion occurred in specific crystal planes, and the large mass difference between Y 3+ and other RE 3+ further causes mass fluctuation and results in lower thermal conductivity. Compared with YSZ, the high-entropy rare earth titanate (Y 0.2 Gd 0.2 Ho 0.2 Er 0.2 Yb 0.2 ) 2 Ti 2 O 7 has lower thermal conductivity, higher thermal expansion coefficient, and excellent high-temperature stability, which has great potential for application in the thermal protection field.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lu Tang,Siyu Chen,Ying Li,Donghong Wang,Zhiyong Chen,Yi Zuo,Sifan Zong,Jimei Xue,Zhijun Wang,Hanjun Wei
Due to the poor electromagnetic (EM) wave attenuation capability and relatively large bandgap of rare-earth silicate materials, their application as EM wave attenuation materials is adversely affected. In this work, TiO 2 was deposited onto the surface of porous Yb 2 Si 2 O 7 using a precipitation process followed by calcination. A transition from TiO 2 nanorods to nanowires resulted in a flower-like three-dimensional (3D) network structure, effectively modulating the dielectric and EM wave-absorbing properties. The TiO 2 /Yb 2 Si 2 O 7 ceramic (YT-3 sample) with a TiO 2 nanowire content of 20.1 wt% achieved a minimum reflection loss (RL min ) of −21.1 dB at 2.3 mm and an effective absorption bandwidth (EAB) of 2.6 GHz at a thickness of 2.5 mm. Furthermore, the EAB fully covered the X-band at thickness ranging from 2.0 to 4.10 mm. The radar cross-section of the YT-3 sample significantly decreased by 21.5 dBm 2 . This improvement likely attributed to the 3D porous structure formed by the TiO 2 nanowires, which improved the impedance matching and electrical conductivity while increasing both homogeneous interfaces and heterointerfaces. This enhancement facilitated electron transfer and hopping, amplified polarization and conduction losses and promoted multiple EM wave reflections and scattering. Additionally, the weight variation of the YT-3 sample was <0.48 % in the range of 25–1400 °C, demonstrating excellent high-temperature stability. These results advances to the development of Yb 2 Si 2 O 7 -based wave-absorbing materials for achieving effective EM wave absorption in high-temperature environments.
研究领域:
材料科学
·
电磁学
·
高温材料
✓ 已验证
产品关联
DOI
高影响因子
Petroleum Science
·
2024
·
IF 6
Cheng Liu,Biao Zhou,Bing-Shan Wang,Huan Wang,Qing You,Guang Zhao,Cai-Li Dai
The intensive development of tight reservoirs has positioned them as a strategic alternative to conventional oil and gas resources. Existing enhanced oil recovery (EOR) methods struggle to effectively exploring reservoir oil, resulting in low recovery rates. Novel and effective means of developing tight reservoirs are urgently needed. Nanomaterials have shown promising applications in improving water flooding efficiency, with in-depth research into mechanisms that lower injection pressure and increase water injection volumes. However, the extent of improvement remains limited. In this study, a silicon quantum dots (Si-QDs) material was synthesized via a hydrothermal synthesis method and used to prepare a nanofluid for the efficient recovery of tight reservoir. The Si-QDs, with an approximate diameter of 3 nm and a spherical structure, were surface functionalized with benzenesulfonic acid groups to enhance the performance. The developed nanofluid demonstrated stability without aggregation at 120 °C and a salinity of 60000 mg/L. Core flooding experiments have demonstrated the attractive EOR capabilities of Si-QDs, shedding light of the EOR mechanisms. Si-QDs effectively improve the wettability of rocks, enhancing the sweeping coefficient of injected fluids and expanding sweeping area. Within this sweeping region, Si-QDs efficiently stripping adsorbed oil from the matrix, thus increasing sweeping efficiency. Furthermore, Si-QDs could modify the state of pore-confined crude oil, breaking it down into smaller particles that are easier to displacement in subsequent stages. Si-QDs exhibit compelling EOR potential, positioning them as a promising approach for effectively developing tight oil reservoirs.
研究领域:
石油工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Aochen Du,Xingke Zheng,Genzhuang Li,Yun Ye,Enguo Chen,Sheng Xu,Tailiang Guo
The lead-free double perovskite, increasingly sought for optoelectronic pursuits, is distinguished by its notable stability, optical properties, and non-toxic characteristic. An extensive inquiry into the structural and photoelectric properties of Cs 2 NaBiCl 6 at heightened temperatures was undertaken using experimental evaluations and theoretical computations. The compound Cs 2 NaBiCl 6 , synthesized using a hydrothermal technique, was confirmed via various analytical methods. Advanced techniques such as high-temperature X-ray diffraction, X-ray fluorescence, X-ray photoelectron spectroscopy, and selected area electron diffraction were employed for the investigation of its crystal structure. Further investigation of microstructure was undertaken using electron microscopes. High-temperature luminescence stability disclosed a high exciton binding energy of 326 meV. The Huang-Rhys factor (6.4) denotes a robust electron-phonon coupling effect and facile formation of self-trapped excitons (700 nm). Applied first principles render valuable insight into structural and photoelectric nuances, notably at escalated temperatures. Cs 2 NaBiCl 6 as an indirect bandgap semiconductor and details the experimental and theoretical bandgap, which exhibits an increasing trend before subsequently declining at elevated temperatures. These results strongly support the material's high-temperature stability, emphasizing its applicability in applications such as rare-earth-doped phosphors. The dynamic stability of the material, evidenced by its mechanical performance, further underscores its potential for application in photoelectric devices.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Jiateng Huang,Feiyu Zhu,Wei Hu,Qiunan Xie,Xiaohan Li,Xiaoma Fei,Jingcheng Liu,Xiaojie Li,Wei Wei
Developing the packaging materials with superior high-temperature stability to meet the requirement of high-power devices is crucial. Herein, we synthesized 4-(4-aminophenoxy)phthalonitrile (APN) and blended it with polyfunctional epoxy resin (EP) to obtain the APN/EP (APNE) binary blends. Further, we employed the APNE as resin matrix to prepare a new high-temperature stable molding compound, aminophenoxyphthalonitrile epoxy molding compound (AEMC), aiming for high-power device packaging. Firstly, the curing behavior, reaction mechanism, thermal stability, and mechanical properties of the APNE system were systematically studied. Although the crosslinking density of the cured APNE decreased with increasing the APN content, the introduction of APN made the cured resins have the stable and rigid structures of isoindoline, triazine, and phthalocyanine. Thus, the cured APNE had the initial thermal decomposition temperature above 370 °C, the glass transition temperature ( T g ) up to 306 °C, and the char yield at 800 °C up to 61.1 %, showing an excellent thermal performance. In addition, the flexural strength, flexural modulus, and impact strength of the cured APNE also increased with increasing the APN content. Such good properties of the APNE resin matrix endowed the AEMC with an attractive performance. The AEMC exhibited a good compatibility in molding process with the current epoxy molding compound (EMC). The T g , thermal-aging resistance, intrinsic flame retardancy, dielectric properties, and thermal conductivity of the cured AEMC were all superior to those of the cured EMC. Therefore, the AEMC shows a good application prospect in the field of high-temperature electronic packaging.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jingying Zhang,Jindan Tian,Bohang Xing,Jiemin Wang,Bin Liu,Hongqiang Nian,Zhe Zhao
High-entropy ceramics have garnered significant attention in recent years owing to their exceptional properties and structural diversity. In this work, single-phase medium/high entropy ceramics, namely (Ca 0.2 Sr 0.4 Ba 0.4 )(Zr 0.5 Ti 0.5 )O 3 and (Ca 0.2 Sr 0.4 Ba 0.4 )(Zr 0.1 Ti 0.9 )O 3 , were successfully designed and prepared utilizing Spark Plasma Sintering (SPS). A comprehensive investigation was conducted into the phase structure, microscopic morphology, dielectric properties , and thermal behavior of these ceramics. It was observed that all ceramics maintained a cubic perovskite structure (space group: Pm 3 ‾ m ), and the introduction of multi-element doping rendered them more stable across a wide frequency and temperature range. Notably, (Ca 0.2 Sr 0.4 Ba 0.4 )(Zr 0.5 Ti 0.5 )O 3 exhibited remarkably low dielectric loss (0.0001 at 1 kHz) at room temperature, along with excellent dielectric temperature stability (25–400 °C). By reducing the zirconium concentration in (Ca 0.2 Sr 0.4 Ba 0.4 )(Zr 0.1 Ti 0.9 )O 3 , a slight decrease in dielectric temperature stability was observed (25–350 °C); however, it demonstrated lower thermal conductivity (0.41 W/(m·K), 1200 °C) and maintained good high-temperature stability. The discovery highlights the promising practicality of both ceramics for high-temperature dielectric applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 12
·8572-8582
·
IF 3.5
Lei Han,Yu Chen,Huifang Wang,Haijun Zhang,Shaowei Zhang
A combined theoretical and experimental approach was used to investigate high-entropy carbonitride. Density functional theory (DFT) calculations suggest that the [N]/([C]+[N]) ratio in (Ti 1/6 Cr 1/6 V 1/6 Mo 1/6 Nb 1/6 Ta 1/6 )(C 1− x N x ) affects its lattice thermal conductivity which could be decreased by 89% by increasing the ratio from 0 to 1/2. Moreover, a robust, flame-retardant and high-temperature resistant (Ti 1/6 Cr 1/6 V 1/6 Mo 1/6 Nb 1/6 Ta 1/6 )(C 0.64 N 0.36 ) high-entropy carbonitride aerogel (6-HECNA) was synthesized. It exhibited a porosity of 94.3%, a compressive strength of 0.9 MPa, and a good high-temperature stability up to 1673 K. These properties, along with its outstanding fire-retardancy, and low thermal conductivity (0.122 W·m −1 ·K −1 at 298 K), make it a promising candidate material for thermal insulation applications under harsh conditions.
研究领域:
材料科学
·
理论计算
·
热力学
✓ 已验证
产品关联
DOI
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
RARE METALS
·
2025
·
IF 11
Li Bo-Kang,Fu Lv-Ping,Gu Hua-Zhi,Huang Ao,Yang Shuang
High-temperature industries, as the primary consumers of energy, are greatly concerned with energy savings. Designing refractory linings with low thermal conductivity to reduce heat dissipation through high-temperature furnace linings is a critical concern. In this study, a series of novel entropy-stabilized spinel materials are reported, and their potential applications in high-temperature industries are investigated. XRD and TEM results indicate that all materials possess a cubic spinel crystal structure with the \(Fd\overline{3} m\) space group. Furthermore, these materials exhibit good phase stability at high temperatures. All entropy-stabilized spinel aggregates demonstrated high refractoriness (> 1800 °C) and a high load softening temperature (> 1700 °C). The impact of configurational entropy on the properties of entropy-stabilized spinel materials was also studied. As configurational entropy increased, the thermal conductivity of the entropy-stabilized spinel decreased, while slag corrosion resistance deteriorated. For the entropy-stabilized spinel with a configurational entropy value of 1.126 R , it showed good high-temperature stability, reliable resistance to slag attack, and a low thermal conductivity of 2.776 W·m −1 ·K −1 at 1000 °C. Graphical abstract
研究领域:
材料科学
·
高温工业
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
YuMei Luo,QingGuo Shang,Hua Hu,Xiaodong Bai
In order to reduce the economic loss caused by well leakage and the lag of drilling progress, it is very important to use plugging materials reasonably and effectively. Expandable polymer materials can better fill cracks and holes of different sizes by absorbing water expansion and deforming. In this article, an expandable polymer plugging agent (PSMAN) was prepared by soap-free emulsion polymerization using methyl methacrylate (MMA), styrene (St), 2-acrylamide-2-methylpropanesulfonic acid (AMPS) as reaction monomers, N -hydroxymethyl acrylamide (NMA) as a cross-linking agent, and ammonium persulfate (APS) as initiator. The optimal synthesis conditions were determined by designing the orthogonal experiments, and the various properties of the materials were tested and evaluated. The experimental results show that PSMAN has good high temperature resistance, spherical structure, and median particle size of 15.099 μm, and the water absorption rate of room temperature at 24 h reaches 37.8 g/g, and pressure bearing capacity can reach 5 MPa. The addition of polymer to water-based drilling fluid can increase the viscosity of drilling fluid and improve the rheological properties of drilling fluid by a small amount. Under normal temperature and medium pressure, the polymer can form a dense film on the surface of the mud cake, thereby reducing the filtration of drilling fluid and effectively improving the stability of the wellbore.
研究领域:
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Feiyang Huang,Lifeng Chen,Weiwei Sheng,Xiaoxia Shang,Zhaonian Zhang
High thixotropic polymer fluids are less prone to gravity collapse and leakage after injected into large-scale space, facilitating complete three-dimensional filling in the annulus of horizontal wells. Therefore, thixotropy is crucial for effective water plugging. To address the limitations of weakened stacking interactions among polymer chains and reduced hydrogen bonding of nanoparticles at high temperatures, a high-temperature thixotropic polymer nanofluid was developed using a composite of nano laponite and thermosensitive polymer poly(acrylamide-acrylamidomorpholine-2-acrylamide-2-methylpropanesulfonic acid) (P(AM-ACMO-AMPS)). The study focused on the structure-activity relationship and gelation properties of the gel at 120℃. The gel exhibited good thixotropy at 120℃, increasing with higher concentrations of polymer and nano laponite. At 1 wt% polymer concentration, the thixotropy value reached 1.445. The scanning electron microscopy (SEM) images indicated that the gel formed a dense three-dimensional network structure of interlaced interpenetration after shearing, enabling smooth and complete annulus filling without gravity collapse. The gel showed a shear thinning coefficient inversely related to solvent dispersion forces and a shear recovery time proportional to solvent polar forces. Gelation time was controllable from 1 to 12 hours, with an elastic modulus reaching 93.9 Pa after gelation. It showed good temperature and salt resistance stability with high quality retention rates. The radial and axial slip pressure gradients at 120℃ were 4.38 MPa/m and 7.34 MPa/m, maintaining 3.96 MPa/m and 6.16 MPa/m after two months, demonstrating excellent compressive strength. The breakthrough pressure gradient reached 18.5 MPa/m, sustaining a plugging rate over 95 %, indicating excellent plugging performance and erosion resistance.
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2017
·Vol. 14
·期 6
·1703454
·
IF 8.643
Jian Pan,Houpu Li,Hao Sun,Ye Zhang,Lie Wang,Meng Liao,Xuemei Sun,Huisheng Peng
Driven by the increasing requirements for energy supply in both modern life and the automobile industry, the lithium–air battery serves as a promising candidate due to its high energy density. However, organic solvents in electrolytes are likely to rapidly vaporize and form flammable gases under increasing temperatures. In this case, serious safety problems may occur and cause great harm to people. Therefore, a kind of lithium–air that can work stably under high temperature is desirable. Herein, through the use of an ionic liquid and aligned carbon nanotubes, and a fiber shaped design, a new type of lithium–air battery that can effectively work at high temperatures up to 140 °C is developed. Ionic liquids can offer wide electrochemical windows and low vapor pressures, as well as provide high thermal stability for lithium–air batteries. The aligned carbon nanotubes have good electric and heat conductivity. Meanwhile, the fiber format can offer both flexibility and weavability, and realize rapid heat conduction and uniform heat distribution of the battery. In addition, the high temperature has also largely improved the specific powers by increasing the ionic conductivity and catalytic activity of the cathode. Consequently, the lithium–air battery can work stably at 140 °C with a high specific current of 10 A g -1 for 380 cycles, indicating high stability and good rate performance at high temperatures. This work may provide an effective paradigm for the development of high-performance energy storage devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）