JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 5
·e70828
·
IF 4.2
Kai Li,Ming Qiang,Jia Tong,Kaichen Qian,Xiaomeng Yin,Bingheng Sun,Long Zhang,Wei Wu,Jintai Fan,Yanna Tian
In this study, MgF 2 –MgO nanocomposite ceramics with an equal volume ratio (5:5) were fabricated via a combination of sol–gel combustion synthesis, surface fluorination treatment, and hot-pressing sintering. Nano-sized MgO powders were initially synthesized via a citrate–glycol sol–gel method, after which the as-prepared powders underwent surface fluorination treatment through reaction with hydrofluoric acid in an ethanol–water mixed solvent system to obtain the final composite powder. This study investigated the influence of sintering parameters on the microstructure and properties of the composite ceramics. The 2-mm-thick MgF 2 –MgO nanocomposite ceramic sintered at 900°C under 200 MPa exhibited a maximum transmittance of 59.6% in the 3–6 µm range, along with a Vickers hardness of 9.57 GPa. This study may provide insights for further development of composite ceramics toward broader applications.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2013
·
IF 3.535
Heng Shi,Zhiyi Liu,Xiaoxiao Wang,Jun Guo,Le Liu,Lin Luo,Jihua Guo,Hui Ma,Shuqing Sun,Yonghong He
In this work, we propose a MgF 2 /Au/MgF 2 /Analyte based, angle-interrogation surface plasmon resonance sensor. This symmetrical structure results in higher surface electric field strengths , and longer surface propagation lengths and depths. A refractive index resolution of 8.1 × 10 −8 RIU in fluid protocol and 3.5 × 10 −7 RIU in atmosphere protocol is acquired by a simple SPR imaging system. In order to demonstrate the biomedical applications of this system, we detect Escherichia coli with different concentrations using dopamine film on the sensor surface to immobilize antibodies. A detection limit of 10 3 cfu/mL of E. coli bacteria is acquired from this system.
研究领域:
光学
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生物传感
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纳米技术
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生物医学工程
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-16
·
IF 15.7
Wu Sheng,Wang Shunyu,Shao Zhigang,Wang Yinzhen,Xiong Puxian
Near-infrared mechanoluminescent (NIR ML) materials attract considerable attention for their force-to-light conversion capabilities. However, current materials generally have disadvantages such as high threshold and poor self-recovery ability, which limit their practical applications. Herein, we present a self-powered NIR ML material MgF 2 :Cr 3+ , which does not require pre-charging process. Leveraging the structural similarity between MgF 2 and MgO, we design a MgO/MgF 2 :Cr 3+ heterojunction piezo-photonic system that exhibits high intensity, low activation threshold, and excellent self-powered ML performance. By tuning the molar ratio of MgO to MgF 2 , the optimized ML intensity enhances by ≈18 times. Kelvin probe force microscopy surface potential measurement reveals a significant built-in electric field at MgF 2 :Cr 3+ heterojunction interface. Based on the first-principle calculation results, the excellent ML performance originates from the offset of the valence band and the conduction band in the MgO/MgF 2 :Cr 3+ heterostructure and the narrowing of the band gap, which significantly improve the electron (4.09 × 10 2 cm 2 V -1 s -1 ) and hole (4.62 × 10 2 cm 2 V -1 s -1 ) mobility, thereby boosting charge transfer and recombination processes. This study provides a strategy for designing high-performance self-powered NIR ML materials based on interfacial effects, offering insights into their expanded applications in the potential bio stress related biological field.
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PubMed
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Molecular Catalysis
·
2021
·
IF 5.062
Zhen Song,Jiameng Wang,Xiqing Zhang,Fanji Liu,Lihong Zhang
A series of MgF 2 -modified hydrotalcite-like (HT) derivatives supported Pt-In catalysts PtInHTR-X (X = NH 4 F, NaF and KF, R = reduced catalyst) were prepared by combination of hydrothermal method, alkali-etching and impregnation strategy and applied to direct dehydrogenation of isobutane to isobutene. The catalysts and precursors were characterized by XRD, SEM, TEM, XPS, TG, O 2 -TPO and low temperature N 2 adsorption-desorption isotherms. The formation of MgF 2 phase as dopant to modify the catalyst can influence the pore structure and even the surface acid properties of catalysts. Especially, compared with the three catalysts, PtInHTR-KF catalyst had better stability of isobutene selectivity of over 95% after 9 h reaction, and PtInHTR-NH 4 F and PtInHTR-NaF catalysts exhibited more stable isobutane activity of 60%. One of the reasons for this catalytic performance is that small particles of MgF 2 and unsaturated MgF 2 can provide weak acidic sites which can inhibit coke deposition. And it was found the improved catalytic performance was also related to the appropriate In 3+ /In 0 ratio, well-dispersed Pt species and the excellent anti-sintering ability of catalysts modified MgF 2 .
研究领域:
催化化学
·
材料科学
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OPTICAL MATERIALS
·
2024
·
IF 3.8
Xindan Li,Ming Yin,Chao Xiao,Zhong Kuang,Shengquan Yu,Xiaoqiang Li,Zhuoying Jia
The co-precipitation approach was successfully used in this investigation to produce MgF 2 nanoparticles. The effects of various heat treatments on the particle size and morphology of MgF 2 nanoparticles were systematically investigated. Based on the experimental results, the powder calcined at 500 °C, having crystallites size that are typically between 80 and 120 nm in size, was identified as the optimal sample. This calcined powder was subsequently used to produce polycrystalline MgF 2 ceramics through hot pressing (HP). It was also investigated how the characteristics of MgF 2 ceramics were affected by low-pressure hot pressing. The results demonstrated that the optimal transmittance of 95.8 % was achieved at a pressure of 30 MPa and a hot-pressing temperature of 800 °C. Furthermore, the dielectric constant (ε r ), Q × f value, Vickers hardness ( H V ), and fracture toughness ( K IC ) of the samples produced at 30 MPa and 800 °C were evaluated. The dielectric constant and Q × f value of MgF 2 ceramics, measured at 13.6231 GHz, were found to be 5.2996 and 114534 GHz, respectively. The Vickers hardness was measured at 5.21 ± 0.42 GPa, and the fracture toughness was determined to be 0.842 ± 0.067 MPa m 1/2 .
研究领域:
材料科学
·
光学材料
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CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 20
·32868-32873
·
IF 5.2
Zehua Zhou,Lu Chen,Qiufeng Huang,Zhonghua Deng,Zhuguang Liu,Jiquan Huang,Wang Guo,Jian Chen
This study introduces transparent MgO ceramics produced via simply vacuum sintering at 1200–1500 °C by optimal incorporation of MgF 2 as a sintering additive. The effect of MgF 2 content and sintering temperature on the densification process, optical, and thermal properties of MgO ceramics is presented with emphasis on its function as a sintering aid and adverse effect of MgF 2 evaporation in the condition of high MgF 2 content or high sintering temperature. MgO ceramic with 1.0 mol% MgF 2 sintered at 1300 °C exhibits the highest relative density of 99.95% with average grain size of 17.46 μm. The in-line transmittance attains 60% at 1000 nm and >80% in the infrared range (3.8–6.8 μm), without absorption bands originated from the carbon contamination. The corresponding room-temperature thermal conductivity reaches 47.25 W/(m∙K). These results demonstrate that MgF 2 is an outstanding sintering additive for the preparation transparent MgO ceramics.
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Catalysts
·
2021
·Vol. 11
·期 4
·478
·
IF 4.146
Zhen Song,Jiameng Wang,Fanji Liu,Xiqing Zhang,Énio Matusse,Lihong Zhang
Here, a simple method was developed to prepare an MgF2-modified hydrotalcite-derived composite, which was used as support for the Pt-In catalyst for isobutane direct dehydrogenation. The catalysts, composites, and their precursors were characterized by numerous characterization techniques. The results provided evidence for the MgF2promoter effect on the physical–chemical properties and dehydrogenation performance of the supported Pt-In catalysts. The catalyst with MgF2shows exceptional isobutene selectivity that can be stabilized at 95%, and the conversion increases from 50% to 58% during the reaction process. Moreover, the existence of MgF2plays an important role in the resistance to coke formation and Pt sintering by improving the Pt dispersion, inhibiting the reduction of the In3+species, and adjusting the acidity of the catalyst.Keywords:isobutane dehydrogenation;MgF2promoter;hydrotalcite-derived composites;supported Pt-In catalysts
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MATERIALS LETTERS
·
2013
·
IF 2.224
Jintai Lin,Shuting Pang,Qianming Wang
We used ultrasonic-assisted microwave technique to synthesize V 2 O 5 /MgF 2 :Eu 3+ with characteristic red emissions. Phototocatalytic performances and emission properties were improved compared to the traditional route. Further investigation indicates that 9% V 2 O 5 (molar ratio V/Mg=9%) gave the best result for decomposing methylene blue (91% in 1 h).
研究领域:
材料科学
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化学工程
·
环境科学
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Energy Storage Materials
·
2019
·
IF 0
Qingshuai Xu,Xianfeng Yang,Mumin Rao,Dingchang Lin,Kai Yan,RuiAn Du,Jiantie Xu,Yuegang Zhang,Daiqi Ye,Shihe Yang,Guangmin Zhou,Yingying Lu,Yongcai Qiu
The big challenge for practical lithium metal batteries is how to make full and reversible utilization of lithium anode. The preformed three-dimensional (3D) porous framework with numerous lithium nucleation sites is able to guide the lithium deposition in the cavity of 3D framework, suppressing the dendrite growth and dimensional change. Herein, we design a nanocapsule structure for lithium metal anodes consisting of 3D graphene with Mg x Li y seeds inside. The 3D composite anode not only can be prepared in a simple and scalable process, but also can meet the requirements for both high energy density and long cycle life in the practical cells. During the observation of lithium deposition by transmission electron microscope, it was found that lithium metal was mainly deposited around the Mg x Li y seeds within 3D graphene. Thereafter, when the composite anodes are well paired with the commercial LiFePO 4 cathodes in coil cells and NCM811 (LiNi 0.8 Co 0.1 Mn 0.1 O 2 ) cathodes in pouch batteries, they are able to deliver the energy density exceeding 350 Wh·kg −1 and long cycle life (>150 cycles) with high energy retention (>85%). The 3D lithium metal/graphene composite anode in the present work provides a promising new avenue for the fabrication of high energy density Li-metal batteries.
研究领域:
材料科学
·
能源技术
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WATER RESEARCH
·
2026
·
IF 12.8
Chao Zhang,Xinlei Pan,Lanfeng Li,Deke Dai,Shainan Peng,Boyi Cheng,Jing Ai,Siwei Peng,Weijun Zhang
Removing fluoride from fluoride-containing wastewater while recovering fluorine resources is important for both environmental protection and resource utilization. Here, three magnesium sources (MgO, MgCl 2 , and MgSO 4 ) were compared for fluoride removal and magnesium fluoride (MgF 2 ) recovery, and the roles of different Mg 2+ supply pathways in MgF 2 recovery were clarified. At pH 1.6–2.4, the hydration products of MgO drive MgF 2 precipitation via acid-promoted dissolution and interfacial F - enrichment, whereas the two soluble magnesium salts provide a stable supply of dissolved Mg 2+ at pH 5–8, thus favoring MgF 2 nucleation and crystal growth. All three magnesium sources yielded rutile-type MgF 2 with purities of 88.3 %–90.5 %, as determined by chemical composition analysis, and all recovered products met the MF-2 grade requirement. Appropriate magnesium source selection, through distinct Mg 2+ supply pathways, broadened the operable pH range for fluoride removal and MgF 2 recovery. Additionally, the anions introduced by the magnesium sources exerted stage-specific effects on MgF 2 crystallization, with Cl - promoting nucleation and SO 4 2- facilitating early crystal growth and particle aggregation. These findings provide mechanistic insight into MgF 2 recovery from complex fluoride-containing wastewater matrices and practical guidance for magnesium source selection.
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高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Lu Chen,Zhuangzhuang Ma,Jian Chen,Wang Guo
Laser-driven solid-state lighting has attracted much attention in recent years. However, the super-high luminous flux under high-power-density laser irradiation is accompanied by an enormous amount of heat. Here, to enhance the thermal robustness of phosphor converter materials, we prepared composite ceramics of YAG:Ce combined with high-thermal-conductivity MgO via simply vacuum sintering. 1.0 mol% MgF 2 was employed as the liquid-phase sintering additive to accelerate the densification process. The optimum temperature proves to be 1400 °C, at which MgO-YAG:Ce composites exhibit highly dense composite structure, without obvious reaction between MgO and YAG phases. Additionally, low sinterability of commercial YAG:Ce particles dragged down the densification process, which limits the YAG:Ce content of the composites. As a result, MgF 2 -doped MgO-10 vol% YAG:Ce composite ceramic (MYF10) sintered at 1400 °C exhibits the highest relative density of 99.33 % and thermal conductivity of 42.05 W/(m·K). Under 34.06 W/mm 2 blue laser excitation in a reflection mode, a stable laser-driven white light is obtained with the luminous flux of 2834 lm and luminous efficiency of 166 lm/W, respectively.
研究领域:
材料科学
·
陶瓷
·
光学材料
·
固态照明
·
热管理
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Hongye Wang,Xiaoyu Li,Xinwei Xu,Jin Cheng,Biao Guo,Xianqiang Chen,Hong Wang
Ultralow-temperature co-fired ceramic (ULTCC) materials with low permittivity and dielectric loss are considered promising materials for 5 G communication applications. Herein, a novel multiphase xMgF 2 -(1x)LiF (x = 0.20, 0.35, 0.50, 0.65) microwave dielectric ceramic was prepared via a conventional solid-state method for ULTCC applications. The ceramic achieves densification at a sintering temperature of 625 °C. The xMgF 2 -(1-x)LiF ceramics exhibit tunable permittivity ranging from 5.21 to 7.30, Q×f from 39400 to 52800 GHz, and τ f from − 61 to − 98 ppm °C −1 . Analysis of the crystal structure and microstructure revealed that the volatilisation of fluoride ions in the ceramics led to an increase in defect concentration, contributing to an unfavourable decrease in dielectric loss. The 0.35MgF 2 -0.65LiF ceramic shows comprehensive properties with the highest Q×f value (52800 GHz) and low permittivity (6.40). Furthermore, the thermal expansion coefficient is an important performance parameter in ceramic packaging with the 0.35 MgF 2 -0.65 LiF ceramic exhibiting a colossal thermal expansion coefficient of 28.69 ppm °C −1 , thus enabling excellent compatibility with printed circuit board (PCB) substrates. Moreover, these high thermal expansion coefficient ceramics are excellent candidates for packaging.
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