MATERIALS LETTERS
·
2017
·
IF 2.572
Weiwei Li,Haijun Huang,Bingchu Mei,Jinghong Song,Guoqiang Yi,Xinsheng Guo
In this paper, high optical quality of Ho:CaF 2 (2 at%) transparent ceramics based on nanopowders were fabricated by hot-pressed method successfully. Ho:CaF 2 ceramics with the average size of about 500 nm were obtained at 800 °C for 1 h. The transmittance of the sample measured to be 89% at the wavelength of 1300 nm. The reduced transmittance in the near-IR range is likely due to the residual pores in the ceramics. The spectral properties of Ho:CaF 2 ceramics demonstrated that there is a strong emission peak around 2030 nm under the excitation of 640 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Zuodong Liu,Yumeng Ji,Chunyan Xu,Yuqing Wang,Yang Liu,Qilong Shen,Guoqiang Yi,Yongsheng Yu,Bingchu Mei,Peng Liu,Qiangshan Jing
Raw SrF 2 powders were synthesized by the chemical precipitation method, and the mean particle size was 58.48 nm. Er:SrF 2 transparent ceramics were obtained by hot-pressed (HP) technique, and the effect of ErF 3 levels on the transparency, microstructure, luminescence spectroscopic and microhardness were studied. The ratio of emission intensities R (Red/Green) increased with the ErF 3 doping levels. The addition of ErF 3 was found effectively to reduce grain size and has a positive effect on improving the microhardness. The SrF 2 ceramic doped with 5 wt.% ErF 3 (2 mm thick) showed the best optical transparency, the transmittance at 500 nm and 1200 nm are 87.9 % and 89.5 %, respectively. The average grain size, Vickers hardness ( Hv ), and fracture toughness ( K IC ) for the SrF 2 ceramic were 21.1 ± 4.5 μm, 1.73 ± 0.04 GPa, and 0.52 ± 0.08 MPa·m 1/2 , respectively.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 16
·
IF 2.7
Zhao Dongpeng,Li Jun,Bai Han,Wu Huantong,Chen Xiping,Sun Guangai,Zhou Zhongxiang
Consistent c -axis orientation characteristics toward the direction of applied pressure of Y -type BaSrCo 2 Fe 11 AlO 22 (BSCFAO- θ ) were successfully prepared by the strategy of hot pressing. The samples’ magnetoelectric coupling performance was greatly enhanced by the strategy of hot pressing than that of the traditional solid reaction method. The magnetoelectric current of BSCFAO- θ ( θ = 0°) (12.06 μ A/m 2 ) was nearly 5 times higher than BSCFAO- SS (2.24 μ A/m 2 ). The magnetoelectric polarization of BSCFAO- θ ( θ = 0°) (32.82 μ C/m 2 ) was nearly 4 times higher than that of BSCFAO- SS (8.31 μ C/m 2 ). The magnetoelectric coupling coefficients of BSCFAO- θ ( θ = 0°) (1880 ps/m) were nearly 4 times higher than those of BSCFAO- SS (404 ps/m). The enhancement of magnetoelectric polarization of BSCFAO- θ ( θ = 0°) can be attributed to the uniform c -axis orientation, which reinforced magnetoelectric polarization compared with none orientation that eliminated the magnetoelectric polarization on grain boundaries. The magnetoelectric coupling performance of BSCFAO- θ presented a gradually decreasing trend with the angle changing from 0° to 90° for the changing of orientation. Compared with traditional solid reaction methods, the strategy of hot pressing inhibits grain growth and increases grain boundaries, thus facilitating the enhancement of grain boundaries’ resistivity, and the electrical resistivity of BSCFAO- θ (3.08 × 10 10 Ω cm) was nearly 10 000 times higher than that of BSCFAO- SS (2.5 × 10 6 Ω cm), which also benefits the magnetoelectric polarization performance of BSCFAO- θ . Therefore, the hot-pressing strategy can contribute to the forming of oriented ceramics and enhance the grain boundaries’ resistivity to improve magnetoelectric coupling performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Xingyang Guo,He Huang,Xiaoming Jiang,Chao Chang,Pan Gao,Wu Zhong,Chuanrong Hu,Dongping He,Jiaojiao Yin
Coconut oil, a natural oil widely utilized in the food, cosmetics, and pharmaceutical sectors, is significantly influenced by varieties and processing techniques. This study compared cold-pressed and hot-pressed extraction methods for coconut oil from four coconut varieties, evaluating their physicochemical properties, fatty acid composition, and antioxidant capacity. The results revealed that cold-pressed coconut oil exhibited superior control over parameters such as acid value, peroxide value, polycyclic aromatic hydrocarbons (PAHs), and 3-monochloropropane-1,2-diol (3-MCPD) esters, along with enhanced antioxidant capacity. Lauric acid, the predominant fatty acid in coconut oil, ranged from 47.68% to 50.08% in these oils. A significant negative correlation was observed between lauric acid and peroxide value/MCPD/PAHs, while a positive association existed between phenolic compounds and antioxidant capacity. Principal component analysis identified cold-pressed coconut oil from the W4 coconut variety as exhibiting the highest quality, characterized by lower acid value, MCPD and PAHs levels, higher lauric acid content, and potent antioxidant capacity. This study highlights the advantages of cold-pressed coconut oil, particularly from the W4 coconut variety, for superior quality across various parameters, offering valuable insights for the production and processing of coconut oil. These findings contribute to the advancement and application of high-quality coconut oil products in the industry.
研究领域:
食品科学
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化学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 2
·368-376
·
IF 6.707
Tian Wenchao,Yan Fei,Cai Cailing,Wu Zeyi,Zhang Chenchen,Yin Ting,Lao Sijia,Hu Linfeng
The dielectric capacitor has been widely used in advanced electronic and electrical power systems due to its capability of ultrafast charging-discharging and ultrahigh power density. Nevertheless, its energy density is still limited by the low dielectric constant(≈ 2.2) of the commercial dielectric polypropylene (PP). The conventional enhancement strategy by embedding inorganic fillers in PP matrix is still difficult and challenging due to that PP hardly dissolves in any inorganic/organic solvent. In this work, we develop a new strategy including freeze-drying, surface functionalization, and hot-pressing to incorporate Ti 0.87 O 2 monolayers in PP film. A series of uniform composited Ti 0.87 O 2 @PP film has been successfully fabricated with Ti 0.87 O 2 content range of 0–15 wt%. The maximum dielectric constant of the as-prepared Ti 0.87 O 2 @PP film is 3.27 when the Ti 0.87 O 2 content is 9 wt%, which is about 1.5 times higher than that of pure PP. Our study provides a feasible strategy to embed two-dimensional material into commercial PP thin-film with superior dielectric performance for practical application.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE-POLAND
·
2016
·Vol. 32
·期 3
·358-363
·
IF 0.533
Zhou W. B.,Cai F. F.,Zhi G. L.,Mei B. C.
Highly-transparent trivalent erbium ion doped calcium fluoride (5 mol % Er:CaF 2 ) ceramics were fabricated by a hotpressing (HP) method using high-purity Er:CaF 2 nanoparticles, which were synthesized by co-precipitation method. The mean grain size of the nanoparticles was about 24.7 nm. The nanoparticles were sintered at 600 °C, 700 °C, 800 °C and 900 °C, respectively, for 30 min under a uniaxial pressure of 30 MPa and vacuum of 10 −3 Pa with 1 mol % lithium fluoride (LiF) as sintering additive. The 5 mol % Er:CaF 2 ceramics sintered at 800 °C exhibits high density and pore-free microstructure with an average grain size of about 8 μm. The optical transmittance of the transparent ceramics is close to 85 % at visible and nearinfrared wavelengths. The strong and broad absorptions peaks corresponding to characteristic absorption of trivalent erbium ions make the ceramics a potential candidate for infrared and upconversion laser operating.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 31
·2210878
·
IF 29.4
Wen-Guang Li,Xu-Dong Wang,Yu-Hua Huang,Dai-Bin Kuang
In recent years, halide perovskites have shown great application potential in X-ray detection due to their superior optoelectronic properties and high X-ray attenuation coefficient. However, large-area perovskite fabrication for high performance X-ray detectors remains extremely challenging. Herein, ultrasound-assisted crystallization combined with the hot-pressing method is proposed to prepare large-area (10 cm × 10 cm) and high-quality quasi-monocrystalline thick film of a mixed-cation perovskite MA 0.42 FA 0.58 PbI 3 . The rapid ultrasound-assisted crystallization provides more homogeneous nucleation, which is essential to the fabrication of large-area and uniform perovskite microcrystalline film. Furthermore, the post hot-pressing treatment is implemented to fuse the crystal boundaries, rearrange the crystal grains, and eliminate the voids between crystals, resulting in a quasi-monocrystalline film. After the hot-pressing treatment, the carrier mobility and the carrier mobility-lifetime product increased about 13-fold (from 1.8 to 23.5 cm 2 s −1 V −1 ) and 18 times (from 8.4 × 10 −6 to 1.5 × 10 −4 cm 2 V −1 ), respectively. As a result, a high-performance MA 0.42 FA 0.58 PbI 3 quasi-monocrystalline X-ray detector is achieved with an impressively high sensitivity (1.16 × 10 6 µC Gy air −1 cm −2 ) and low detection limit (37.4 nGy air s −1 ), demonstrating the potential of the ultrasound-assisted crystallization and hot-pressing strategy from an industrial perspective.
研究领域:
材料科学
·
医学成像
·
半导体物理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Liqing Ai,Weikang Lin,Limei Ai,Yannan Li,Mengyi Qiang,Xiaoya Wang,Min Shi,Zhengbao Yang,Xi Yao
The integration of soft, conformable components and rigid microelectronics or devices is a critical frontier in stretchable hybrid device development. However, engineering interconnects capable of tolerating high-stress concentrations and preventing debonding failures remain a key challenge. Here a stretchable conductive interconnect derived from the liquid metal conductor with supramolecular confinement is reported, capable of reliably connecting soft and rigid parts through a simple “Heat-Press-N-Go” method. Leveraging the dynamic bonding nature of supramolecular polymers, when confined within liquid metal compartments, not only effectively stabilizes the conductive path of the stretchable interconnect, but also offers high adhesion to diverse surfaces, reaching an exceptional electrical stretchability of up to 2800%. As proof of concept, this interconnect is used to assemble wearable devices including reconfigurable stretchable circuits, multifunctional sensors, and on-skin electromyography, exhibiting high signal integrity and mechanical durability. The “Heat-Press-N-Go” chip and circuit integration offers the boundless potential to enhance the adaptability, convenience, and versatility of on-skin and wearable electronics across various applications.
研究领域:
材料科学
·
柔性电子学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Jianlong Chai,Yabin Zhu,Lijuan Niu,Tielong Shen,Minghuan Cui,Zhiguang Wang
Al 2 O 3 /ZrO 2 /SiC ceramic composites with different SiC contens have been prepared by hot pressuring. The effect of SiC content on the microstructure and mechanical properties of composites have been studied. The results show that SiC has obvious grain refinement effect on ZTA ceramics and change the fracture mode of the matrix from intergranular fracture to transgranular fracture . Simultaneously, it has been found that the mechanical properties of the material are significantly enhanced in comparison with ZTA matrix. The highest strength is acquired at 10% SiC content, the flexural strength and toughness are obtained when the SiC content is 15 vol%, and the values are 18.86 GPa, 1262 MPa and 6.13 MPa m 1/2 , respectively. The mechanisms of hardening, strengthening and toughening have been discussed.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry Letters
·
2022
·
IF 6.888
Xiao Zhao,Shimao Wang,Fuwei Zhuge,Yanan Song,Toru Aoki,Weiwei Dong,Mengyu Fu,Gang Meng,Zanhong Deng,Ruhua Tao,Xiaodong Fang
Considering the disadvantages of the common methods for CsPbBr3 single crystal growth including the high cost of the melt method and the low shape controllability of the solution method, a facile hot-pressed (HP) approach has been introduced to prepare CsPbBr3 wafers. The effects of HP temperature on the phase purity of HP-CsPbBr3 wafers and the performance of the corresponding photodetectors have been investigated. The HP temperature for preparing phase-pure, shape-regular, and dense CsPbBr3 wafers has been optimized to be 150 °C, and the HP-CsPbBr3 wafer based planar-type photodetectors exhibit an ultrasensitive weak light photoresponse. Under the illumination of a 530 nm LED with a light power density of 1.1 μW cm–2, the responsivity, external quantum efficiency, and detectivity of the devices reach 19.79 A W–1, 4634%, and 2.14 × 1013 Jones, respectively, and a fast response speed with a rise time of 40.5 μs and a fall time of 10.0 μs has been achieved.
研究领域:
材料科学
·
光电子学
·
纳米技术
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·Vol. 142
·期 32
·e57283
·
IF 2.8
Limei Zhang,Yi Jiang,Hao Gu,Zhengyang Ji,Junlai Jiang,Yanling Cao,Jinyu Gao,Bo Jiang
As an ideal flexible polymer piezoelectric material, PVDF material has a broad application prospect in pressure sensing, health monitoring, and so forth. However, traditional PVDF-based sensors usually suffer from problems such as low open-circuit voltage and slow deformation recovery. In this paper, inspired by the beaded structure of soybean rhizobial fungus, we used the strategy of combining electrostatic spinning and hot-pressing technology to construct a BTO/PVDF piezoelectric film. Specifically, PVDF is used as the substrate and doped with BTO particles to prepare a beaded internal structure. Then, hot pressing was performed to enhance the β-crystalline phase ratio of PVDF to increase the piezoelectric performance of the device. The sensors prepared by this method possess a high sensitivity of 25.23 mV/kPa in the 0–5 kPa range. The fast response time is 86 ms, and the recovery time is 57 ms, maintaining high cycling stability above 92% under loading and unloading for more than 10,000 cycles. Finite element numerical simulation analysis confirms that the BTO/PVDF piezoelectric thin films prepared by this process have excellent sensing performance. Integrating the device with a data acquisition and processing module can easily detect various life activities of the human body, which has great potential in flexible electronic skin, motion acquisition, and so on.
研究领域:
生物医学工程
·
纳米材料
·
柔性电子
·
传感器技术
·
转化医学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Yang Pan,Bin Yang,Ning Jia,Yangnan Yu,Xiang Xu,Yingying Wang,Bin Wu,Jiasheng Qian,Ru Xia,Chenjun Wang,Aiqing Sun,You Shi
In this work, multi-layer hot pressing (MLHP) method was used to prepare the graphene nanoplatelets (GNPs) filled polymethyl methacrylate (PMMA) composites. Effect of GNP content on the viscoelastic behavior and thermomechanical properties of composites was studied via rheometer, scanning electron microscope (SEM), infrared thermal imaging (ITI) and dynamic mechanical thermal analysis (DMTA), etc. According to dynamical rheological testing, thermorheological complexity was clearly displayed at elevated GNP content, based upon flow activation energy ( E a ) and time-temperature superposition (TTS) principle. The infrared thermal imaging (ITI) indicated that a filler conductive network was gradually formed with increasing filler content. The average heating rate of the samples increased from 0.74 to 0.92 °C/s. The Agari model was found to fairly interpret the variation of thermal conductivity as a function of GNP loading, which agreed well with SEM observation and indicative of the formation of a GNP network structure. Dynamic thermomechanical properties of the composites were heavily influenced by the temperature distributions within the samples. The addition of GNP increased the glass transition temperature of PMMA from 116.7 to 125.9 °C, which favored enhanced thermophysical properties of PMMA. The prepared composites in this work showed wonderful mechanical properties even at relatively high temperatures (e.g., having storage modulus of 1.3–1.9 GPa and yielding strength more than 58.0 MPa at 50 °C). The current work is practically significant for further expanding the application range of PMMA/GNP nanocomposites.
研究领域:
材料科学
·
复合材料
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）