JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 34
·1-9
·
IF 2.8
Gao Dawei,Ma Juncheng,Zhang Jiafen,Shi Qingang,Xiong Zhe,Zhang Xing,Tang Bin
The occurrence of "dark holes" is a common phenomenon in TiO 2 -based ceramics, resulting from the reduction of Ti 4+ under high-temperature and low-oxygen partial pressure sintering conditions. To achieve low dielectric loss, Ca 0.61 Nd 0.26 Ti 1- x Cu x O 3 ceramics were designed and prepared in this work. The results indicate that moderate doping of CuO not only enhances insulation resistivity and Q × f value but also reduces the positive τ f value. The Ca 0.61 Nd 0.26 Ti 0.98 Cu 0.02 O 3 sample exhibited the highest Q × f value of 16,895 GHz, contributing to the miniaturization and insertion loss of microwave devices.
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
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Huang Ming,Zhang Jinxian,Tang Yu,Mao Haijun,Liu Zhuofeng,Li Wei,Wang Fenglin,Zhang Weijun,Chen Xingyu
A novel MnTiNb 2 O 8 -based microwave dielectric ceramic was synthesized by solid-state route and its microwave dielectric properties were investigated. The effects of excess Mn 2+ on the microstructure and microwave dielectric properties of Mn x TiNb 2 O 8 ( x = 1.00–1.20) were investigated. The X-ray diffraction and scanning electron microscopy results showed that MnTiNb 2 O 8 was the dominant crystalline phase in all samples, but TiO 2 , as a second phase, was consistently present. The complex impedance spectroscopy and X-ray photoelectron spectroscopy analysis suggested that the addition of a small amount of Mn could inhibit the formation of oxygen vacancies and hinder the reduction of Ti 4+ . The study found that by adding a small amount of Mn, the quality factor ( Q × f ) of ceramics can be significantly improved without affecting the dielectric constant ( ε r ), thereby greatly optimizing the dielectric properties of ceramics. Subsequently, the temperature coefficient of resonant frequency ( τ f ) of the ceramic was successfully adjusted to near zero by adding a small amount of Zr 4+ instead of Ti 4+ . Among all Mn x Ti 1- y Zr y Nb 2 O 8 ( x = 1.00–1.20, 0 ≤ y ≤ 0.28) ceramics, samples with x = 1.05 and y = 0.1 sintered at 1200 °C showed the best microwave dielectric properties: ε r = 32.9, Q × f = 11,427 GHz, and τ f = 0 ppm/°C.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Han Bin Kim,Woo Jin Lee,Seuk Cheun Choi,Ki Bong Lee,Myong-Hwa Lee
Bag filters are generally used to remove particulate matter from the dust-laden flue gas exhausted from combustors. Recently, great effort has been expended to improve the performance of bag filters by coating the filter surface with nanofibers. In this study, meta-aramid nanofibers with high thermal durability were produced by an electrospinning process, and the effect of fiber diameter on the filter quality factor was theoretically and experimentally investigated. Electrospun filters with mean fiber sizes of 333 nm and 569 nm were successfully prepared by controlling the electrospinning parameters. The filters had high mechanical and chemical durability, as per the results of thermogravimetric analyzer (TGA), X-ray diffraction (XRD), Fourier-transform infrared (FT-IR), and a tensile strength analyses. In addition, the particle collection efficiency and pressure drop of the filters increased as the fiber diameter decreased. The filter quality factor, determined by the relationship between the collection efficiency and the pressure drop, increased slightly with the decrease in fiber diameter, although the experimental results were slightly different from the theoretical results.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2021
·Vol. 104
·期 11
·6054-6063
·
IF 3.784
Xing Zhang,Cheng Liu,Liang Shi,Wenhao Xu,Hongyang Zhang,Rui Zeng,Huaiwu Zhang
Ti 4+ -modified MgZrNb 2 O 8 (MgZr 1- x Ti x Nb 2 O 8 , x = 0, 0.1, 0.2, 0.3, 0.4) ceramics were synthesized using the traditional solid-state reaction method. Pure MgZr 1– x Ti x Nb 2 O 8 was detected without any secondary phase via the X-ray diffraction patterns. According to the sintering behavior and the surface morphology results, the introduction of Ti 4+ reduced the sintering temperature and promoted the grain growth. The correlations between the dielectric properties and the crystal structure were analyzed through the Rietveld refinement and Raman spectroscopy. The slight shifts of the Raman peaks, corresponding to different vibration modes, were induced by the substitution of Ti 4+ for Zr 4+ and related to the improved quality factor. In general, the sample of MgZr 0.9 Ti 0.1 Nb 2 O 8 sintered at 1320°C for 4 h exhibited promising microwave dielectric properties with an ultra-high Q × f value of 130 123 GHz (at 7.308 GHz, 20°C), which is potential for 5G communication 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
·
2021
·Vol. 104
·期 10
·5110-5119
·
IF 3.784
Xiaoqing Chen,Hao Li,Pengcheng Zhang,Houlin Hu,Yu Tao,Gaosheng Li
A low-firing SrZnV 2 O 7 ceramic was synthesized via a traditional solid-state sintering route. The phase formation, grain morphology, and dielectric performance were studied in detail. Rietveld refinements based on XRD data revealed that SrZnV 2 O 7 crystallized in the monoclinic space group P2 1 /n, which was further confirmed by TEM analysis. The dense SrZnV 2 O 7 ceramic with an ε r of 11.28, a Qf of 56 660 GHz, and a τ f of −27.2 ppm/°C was yielded at a low sintering temperature of 740°C for 4 h. Its chemical compatibility with Ag was verified via XRD and SEM-EDS analysis, which rendered SrZnV 2 O 7 a prospective candidate for LTCC technology.
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
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Haotian Liu,Liang Shi,Cheng Liu,Dainan Zhang,Kui Liu,Huaiwu Zhang
Ion substitution engineering is an effective procedure in refining the crystal structure and performance for the microwave dielectric ceramics . In this study, MgTa 2 O 6- x F 2 x ( x = 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) ceramics were synthesized using the conventional solid-phase reaction method. The effects of F − substitution for O 2− in MgTa 2 O 6 matrix were systematically investigated. The correlations between the crystal structure and the microwave dielectric properties were analyzed. The solution of F − into the oxygen sites was confirmed by the XRD and Raman spectra. The introduction of F − improved the morphology as well as the stability of the crystal structure significantly, which successfully depressed the electromagnetic wave loss through the bulk and enhanced the quality factor ( Q × f ) by nearly 50%, reaching up to 179,000 GHz (7.15 GHz) in the sample of x = 0.4 at the sintering temperature of 1425 °C.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Baoyuan Cheng,Tengfei Qiu,Mingliang Jin,Guofu Zhou,Michael Giersig,Xin Wang,Eser Metin Akinoglu
Two-dimensional polystyrene sphere opals are important materials for nanotechnology applications and fundamental nanoscience research. They are a facile and inexpensive nanofabrication tool, but the quality factor of these opals has drastic differences between reports. Additives like ethanol, ions, and organic molecules in the aqueous particle spreading solution are known to affect the quality factor and growth efficiency of the produced opals. However, a systematic study on the effect and optimization of some of the most effective additives has not been reported until now. Here, we investigate the influence of additives on the growth efficiency and quality factor of such monolayers formed at the air–water interface without the use of a Langmuir–Blodgett trough. The additives induced large variations in the monolayer quality factor and growth efficiency, and we found that the ideal additive content of the spreading agents is 30 wt % < cethanol < 70 wt %, 0 < cH2SO4 < 30.5 mM, and 0 < csty < 255.0 mM. This study provides a guideline for the rational composition and additive content of the spreading solution to obtain high-quality two-dimensional opals for further applications in nanofabrication and photonics and will enable researchers and application engineers to produce standardized nanofabrication materials.
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
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 6.6
Yiyuan Chen,He Huang,Ruiyang Yin,Shuo Wang,Jiaxin Hong,Yashuai Wu,Liyun Guo,Yumei Song,Dongrui Zhao,Jinyuan Sun,Xiaotao Sun,Mingquan Huang,Jinchen Li,Baoguo Sun
Beer is one of the most widely consumed alcoholic beverages worldwide. Nowadays, consumers have increasingly prioritized personalized and high-quality products. Beer distilled spirits represents a notable example of this trend. However, the key quality factors between beer and its distilled spirits remain unclear, which significantly impedes the development of beer derivatives. In this study, a total of 260 trace components were identified by gas chromatography-mass spectrometry. Among them, 82 dual-effect flavor factors were identified through flavor expression evaluation (Osme, AEDA, OAV, and TAV). The random forest model, correlation analysis, and adding validation experiments were employed to screen eight key flavor quality factors (3-methyl-butanol, ethyl hexadecanoate, phenethyl acetate, γ -nonalactone, ethyl octanoate, 4-ethylguaiacol, maltol and α -terpineol) that significantly influenced the sensory attributes of malt aroma, caramel aroma, fermentation aroma, sweet taste, bitter taste, and astringency. The aforementioned key flavor quality factors can be employed as a primary indicator for the monitoring and optimization of quality processes in both beer and beer distilled spirits.
研究领域:
食品科学
·
代谢组学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2020
·
IF 2.678
Jiajun Wu,Obed Akampumuza,Penghong Liu,Zhenzhen Quan,Hongnan Zhang,Xiaohong Qin,Rongwu Wang,Jianyong Yu
Software simulation is a convenient and efficient way to design and check different air filter structures with high efficiency and low pressure drop. In this work, nanofiber filters of different diameters ranging from 100 to 900 nm were designed to check their influence on filtration efficiency, pressure drop and quality factor ( QF ). Slip-flow effect of air molecules was considered on the surface of single fiber. Then, filters with different diameter distributions were constructed to study the filtration efficiency discrepancy when the filter thickness and porosity were kept equal. With a rotation of the filters composed of nanofibers of 500 nm in diameter in the computational domain, the filtration efficiency and QF increased steadily. The simulation results were partially verified by electrospun cellulose acetate nanofiber filter, and meanwhile provide with new insights into the filter structure design of high filtration efficiency with low pressure drop.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
APPLIED PHYSICS LETTERS
·
2024
·Vol. 124
·期 9
·
IF 3.5
Zhou Pengfei,Zhang Pengcheng
The Li 2 Mg 3 Ti 1 − x Al 4 x /3 O 6 (0 ≤ x ≤ 0.1) ceramics are synthesized using the solid phase method, showing excellent microwave dielectric properties with ε r = 14.05, Q × f = 144 500 GHz, and τ f = −43 ppm/°C at x = 0.04. Rietveld refinements, based on the XRD data, reveal that the Li 2 Mg 3 Ti 1 − x Al 4 x /3 O 6 ceramics crystallize in the rock salt structure with Fm-3m space group. The relationship between the crystal structure and intrinsic microwave dielectric properties is studied in detail. The variation in the dielectric constant is related to ionic polarization and relative density. The quality factor (Q × f) demonstrates a strong correlation with lattice energy, relative density, and concentration of Ti 3+ . The variation of τ f is influenced by the bond thermal expansion coefficient and bond valence. The dielectric resonant antenna, manufactured from Li 2 Mg 3 Ti 0.96 Al 0.0533 O 6 -0.09TiO 2 ceramic with near-zero τ f , shows a bandwidth of 230 MHz at 7.40 GHz and a high radiant efficiency, which indicates that high-quality factor Li 2 Mg 3 Ti 0.96 Al 0.0533 O 6 ceramic has significant potential in relevant fields such as 5G and smart driving.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Falong Wang,Yaqiang Dong,Liang Chang,Yan Pan,Qiang Chi,Mengji Gong,Jiawei Li,Aina He,Xinmin Wang
In this paper, a novel type of nano-CaCO 3 /epoxy nanocomposites insulating layer for the FeSiCr/carbonyl-iron soft magnetic composites (SMCs) has been successfully developed. The novel inorganic/resin nanocomposites can greatly reduce the core loss of the SMCs while maintain other excellent magnetic properties . By optimizing the content of insulating layer, the FeSiCr/carbonyl-iron SMCs exhibits the lowest core loss of 466.5 mW/cm 3 at a maximum magnetic induction of 50 mT and frequency of 100 kHz, which is greatly reduced by 24.2%, compared with the sample only coated by epoxy resin . Meanwhile, the effective permeability and quality factor remains high. In addition, the production process of the novel nano-CaCO 3 /epoxy nanocomposites insulating layer exhibits the advantages of simplicity, convenience and low cost compared with other ceramic coatings (Al 2 O 3 , MgO , SiO 2 , etc.) and surface nitride coatings, which is more suitable for the industrialization of molded inductors, and therefore has a variety of industrial application prospects.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Qinfei Xu,Guibin Wang,Chunhui Xiang,Xin Cong,Xuzhao Gai,Shuling Zhang,Mei Zhang,Haibo Zhang,Jiashuang Luan
It has been proved that air filtration is the most effective solution to solve air pollution from the origin. However, as the core filter material in air filter bags, most of fiber materials are not able to maintain their basic performance under the condition of high temperature, high humidity and corrosion. Hence, creating such a new material used in harsh conditions for dust removal has proved to be extremely challenging. In this study, high-performance poly (ether ether ketone) (PEEK) fiber was developed to fabricate a PEEK nonwoven filter (PEEK NWF) which showed outstanding stability under sulfuric acid, sodium hydroxide and 250 °C high temperature conditions. Moreover, to capture more fine particles, PEEK NWF impregnated with PTFE emulsion (PEEK/PTFE) and ePTFE coated membrane PEEK (PEEK/ePTFE) filter with a sandwich structure were also constructed. PEEK NWF and PEEK/PTFE filters exhibited extremely low filtration resistance (10 Pa, 10.3 Pa) and higher quality factor (0.7036 Pa −1 , 0.8222 Pa −1 ). Compared with PEEK NWF and PEEK/PTFE filters, PEEK/ePTFE filter displayed higher filtration efficiency for fine particles, and its filtration efficiency for particles size of 2.5 μm increased from 72.09% to 98.5765% which was close to nanofiber membrane filtration efficiency. The results suggested that PEEK NWF as well as its composites filters could make them promising candidate materials used in harsh conditions for dust removal.
研究领域:
材料科学
·
环境工程
·
化学工程
·
过滤技术
✓ 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）