Analytical Methods
·
2013
·Vol. 5
·期 22
·6306-6311
·
IF 1.855
Zhiyi Liu,Qing Peng,Heng Shi,Shuqing Sun,Jun Guo,Xiaoxiao Wang,Le Liu,Yanhong Ji,Jihua Guo,Hui Ma,Yonghong He
We report a MgF2–Au–MgF2-polydopamine based surface plasmon resonance (SPR) sensor and its biomedical applications. The symmetrical MgF2–Au–MgF2 geometry induced a minimum loss of surface plasmons leading to, so far, the best refractive index resolution of 2.2 × 10−8 refractive index units (RIU) in a glucose solution protocol. Meanwhile, a high detection performance could be maintained in the sensed medium with a refractive index ranging from 1.03 to 1.33 RIU. In order to solve the problem of surface functionalization on MgF2, which was thought to be inert, we managed to form adherent polydopamine films onto the MgF2–Au–MgF2 surface by dopamine self-polymerization, and found that secondary reactions could be used to create a variety of ad-layers for further biological uses. Finally, a model experiment on a chip detecting cellular mediators in human aqueous humor demonstrated the biomedical application of this system.
研究领域:
生物医学工程
·
光学传感
·
材料科学
✓ 已验证
DOI
高影响因子
OPTICS LETTERS
·
2022
·Vol. 47
·期 23
·6293-6296
·
IF 3.56
Chongyang Cai,Leipeng Li,Pei Li,Tao Li,Dengfeng Peng,Yanmin Yang,Yanmin Yang
Mechanoluminescent materials have attracted considerable attention over the past two decades, owing to the ability to convert external mechanical stimuli into useful photons. Here we present a new, to the best of our knowledge, type of mechanoluminescent material, i.e., MgF2:Tb3+. In addition to the demonstration of traditional applications, such as stress sensing, we show the possibility of ratiometric thermometry using this mechanoluminescent material. Under stimulation of an external force, rather than the conventional photoexcitation, the luminescence ratio of 5D3→7F6 to 5D4→7F5 emission lines of Tb3+ is confirmed to be a good indicator of temperature. Our work not only expands the family of mechanoluminescent materials, but also provides a new and energy-saving route for temperature sensing.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Catalysis Science & Technology
·
2017
·Vol. 7
·期 24
·6000-6012
·
IF 5.773
Wenfeng Han,Chunpeng Zhang,Haili Wang,Shenglan Zhou,Haodong Tang,Luteng Yang,Zhikun Wang
Hydrofluorocarbons (HFCs) which are usually potent greenhouse gases are regulated by the Montreal Protocol and its amendments, especially the recent Kigali Amendment. Dehydrofluorination of HFCs is an efficient route for the conversion of these greenhouse gases to value added and environmentally benign chemicals. Although AlF3 with strong Lewis acidity catalyzes dehydrofluorination, it also favors carbon deposition. MgF2 with weak acidity inhibits coking significantly. Unfortunately, MgF2 sinters dramatically at temperatures below 300 °C leading to the low activity for dehydrofluorination. In the present work, we report that sub-nano MgF2 embedded in carbon fibers and electrospun MgF2 fibers prevent sintering of MgF2 during dehydrofluorination reaction. Via simple and one-step electrospinning and calcination in a N2 (for embedded MgF2) or air (for MgF2 fibers) atmosphere, embedded MgF2 with particle sizes between 3–6 nm and pure MgF2 fibers with diameters of around 100 nm were fabricated. No sintering was observed following reaction at 450 °C. The fine MgF2 particles and MgF2 fibers facilitate the formation of under coordinated Mg species in MgF2 which are the weak acid sites. By embedding MgF2 or fabrication of MgF2 fibers, weak acid sites are increased significantly, while strong acid sites remain almost unchanged. Hence, they show significantly higher reaction rates than MgF2 prepared by precipitation of Mg(CH3COO)2·4H2O with NH4F for the dehydrofluorination of 1,1,1-trifluoroethane (HFC-143a) to VDF (CH2CF2) at 450 °C.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jiahao Wu,Jielei Tu,Hua Yang,Hao Wu,Zhangyang Xv,Weichen Wang
The efficiency of photovoltaic (PV) modules, the core unit for converting solar energy to electricity, is limited by the reflection loss of the glass cover and the adsorption of organic pollutants. Thus, the development of coatings with antireflective and self-cleaning composite functions is important. In this study, based on the sol-gel method, hollow MgF 2 /TiO 2 (MgF 2 @TiO 2 ) composites were prepared and, combined with the Essential Macleod software, coatings were designed and optimized. Using this approach, a three-layer antireflective coating with a self-cleaning function was developed. Moreover, subjecting the MgF 2 @TiO 2 composites to 24 h heat treatment resulted in the production of MgF 2 with a stable hollow rod structure and a refractive index of 1.18. The photocatalytic performance of TiO 2 was enhanced by optimizing the annealing temperature, and the strongest effect was achieved at 300 °C. In addition, the optimization of the coating structure resulted in a gradient refractive index coating with high process tolerance, with an average reflectance of 0.81% in the visible wavelength band. The application of the coating to mini-PV modules increased the light transmittance to 97.58% and the efficiency of the module by 5.71%, with a strong self-cleaning effect. The coating was demonstrated to have excellent durability and reliability upon exposing it to 2000 h of damp heat and subjecting it 1000 abrasion cycles. This study promotes the design and application of functional coatings on the surfaces of PV modules.
研究领域:
材料科学
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能源技术
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Yihui Zhang,Miao Fa,Liuying Xiong,Yangbo Ma,Wei Chen,Xiying Li,Shuaishuai Zhou,Liqun Mao
Cadmium sulfide (CdS), as visible-light driven photocatalysts for water splitting to produce hydrogen, has been extensively investigated. However, its practical application is hindered by the rapid recombination of photogenerated carriers. To address this limitation, Pt 4 Pd/MgF 2 /CdS was developed in this study. The structure of the synthesized 1.5 %-Pt 4 Pd/MgF 2 /CdS was characterized by XRD, HRTEM, and XPS, the results showed that both MgF 2 and Pt 4 Pd uniformly distributed on the surface of 2D-CdS. Then, the photocatalytic performance of Pt 4 Pd/MgF 2 /CdS was tested, and the results demonstrated that 1.5 %-Pt 4 Pd/MgF 2 /CdS exhibits high activity and stability, with a hydrogen production rate of 75 mmol/h/g. Based on measurements results (UV–Vis/PL/ESR/work function), we propose that the increase of photocatalytic efficiency atributed to: 1) MgF 2 inhibits the photocorrosion of CdS without affecting light absorption; 2) the abundant Lewis acid sites on the MgF 2 surface facilitate the transfer of conduction band electrons from 2D-CdS; 3) the loading of Pt 4 Pd alloy onto the CdS surface forms a Schottky barrier, which promotes the separation of photogenerated charge carriers.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2017
·
IF 2.572
Zihan Ji,Lei Bao,Hongning Wang,Ruoyu Chen
Antireflective films with self-cleaning and abrasion-resistance properties show good performance in outdoor contaminated environments. In this paper, hollow rod-like MgF 2 sol was synthesized using the solvothermal method and 50 nm SiO 2 particle sol was prepared using the Stöber method. The SiO 2 -MgF 2 mixed sol was prepared by adjusting the zeta potential of the two sols, and then the SiO 2 -MgF 2 mixed films were coated on the glass using the dip-coating method. The maximum transmittance was 99.4% and the average transmittance was 97.5% in 400–800 nm wavelength regions. After the films were modified by n-hexadecyltrimethoxysilane (HDTMOS), the contact angle reached 150.2°, and the pencil hardness reached 4–5 H. In this way, the multi-functional antireflective films were endowed with significant practical value.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Yiming Yu,Yaowu Wei,Kui Liu,Bo Chen,Junfeng Chen
This paper aims to improve the density and thermal shock resistance of Y 2 O 3 ceramics for the preparation of ultra-pure high-temperature alloy crucible materials. The doping effect of MgF 2 content on the densification behavior, physical properties, and thermal shock resistance of Y 2 O 3 ceramics was systematically investigated in this paper. The results suggested that the presence of MgF 2 greatly promoted the growth of Y 2 O 3 grains and the transformation of the pore structure by liquid-phase sintering. And the mechanical properties of the MgF 2 -doped Y 2 O 3 ceramics were significantly improved. Besides, the marked improvement in the thermal shock resistance of MgF 2 -doped Y 2 O 3 ceramics was attributed to the synergistic action resulting from the growth of grain size and the enhancement of the crack deflection effect. In particular, the relative density of Y 2 O 3 ceramics doped with 1.5 wt% MgF 2 reached 96.4% and the residual flexural strength ratio after thermal shock achieved 45.0%, showing an excellent application prospect.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Yan Wang,Haohao Ji,Dewen Wang,Shunzo Shimai,Xiaojian Mao,Jian Zhang,Shiwei Wang
High-quality transparent Al 2 O 3 ceramics were successfully prepared using MgF 2 as a sintering additive. Comprehensive investigations involving microstructure characterization, optical/mechanical properties, and sintering kinetics analysis found that F anions play a dominant role in enhancing densification with slight effects on grain size. While Mg cations primarily suppress grain growth through solute drag effects. Significantly, the combining functions of Mg and F confer MgF 2 remarkable superiority over both conventional spinel and AlF 3 additives upon the preparation of transparent Al 2 O 3 ceramics. Consequently, MgF 2 -doped Al 2 O 3 ceramics with the optimum dopant content (500 ppm) present the highest in-line transmittance of 61.6 % at 640 nm alongside superior mechanical properties (hardness of 21.8 GPa, indentation fracture toughness of 2.73 MPa·m 1/2 ). By elucidating the coupled sintering roles of Mg-F pair, this work provides a novel paradigm for designing dual-functional additives in transparent Al 2 O 3 ceramics.
研究领域:
材料科学
·
无机非金属材料
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 53
·33335-33343
·
IF 3.108
Kai-Li Yang,Shan Huang,Hu Pan,Heng Zhang,Xiao-Fang Liu,Song Yang
A series of highly active and stable Keggin heteropolyacid catalysts were prepared through mixing of 12-tungstophosphoric acid (TPA) with magnesium fluoride (MgF2). Among those acidic catalysts, the Mg20F39TPA-1.0 hybrid with moderate acidity (0.96 mmol g−1) and good dispersion of active sites presented pronounced catalytic performance in esterification of oleic acid (up to 95% oleic acid conversion). Particularly, Mg20F39TPA-1.0 was also efficient for the transesterification of Jatropha oil with a high acid value, giving biodiesel in 93% yield. Moreover, the catalyst showed good durability and reusability for at least five consecutive cycles.
研究领域:
化学工程
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2016
·Vol. 4
·期 5
·722-730
·
IF 5.359
Xinmin Cui,Ruimin Ding,Mengchao Wang,Cong Zhang,Ce Zhang,Jing Zhang,Yao Xu
For the broadband antireflective (AR) coating working in specific wavelengths, the precise control over refractive index and film thickness of each layer is critical to guarantee the peak position locating at the targeted wavelengths. In this paper, a simple sol–gel procedure without post-treatment is used to prepare MgF 2 –SiO 2 hybrid coating with tunable refractive index for the fabrication of tri-layer tri-wavelength broadband AR coating. The MgF 2 –SiO 2 coating with ultralow refractive index of 1.12 is realized through in situ surface assembly of negatively charged silanol groups on vesicle-like MgF 2 particles to obtain porous crosslinking structure. The electrostatic attraction between the negatively charged silanol groups and positively charged MgF 2 colloidal particles plays a key role. Furthermore, the MgF 2 –SiO 2 coating with a wide range of refractive index between 1.20 and 1.44 is achieved by adjusting the addition amount of acid-catalyzed silica sol into the vesicle-like MgF 2 sol. According to the theoretical design, a tri-layer broadband AR coating with refractive index model of 1.12/1.26/1.36 is prepared, which can enhance the transmittance of quartz substrate to near 100% simultaneously at 351, 527, and 1053 nm.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
ChuanYao Zhai,QingBo Sun,AnQuan Ma,WenHao Wang,TianTian Zhu,Yan Zhang,TianJiao Yu,ZiQing Yang,Jing Lan,ZhiFeng Wang
Bone defect repair relies on the reconstruction of the maxilla and alveolar bone. Magnesium and its alloys offer great potential as implant materials due to their biocompatibility and mechanical properties, but their rapid degradation limits clinical use. This study developed an MgF 2 -polydopamine-Epigallocatechin gallate (MgF 2 -PDA-EGCG) composite coating on AZ31B magnesium alloy using hydrofluoric acid fluorination and layer-by-layer self-assembly. The coating’s corrosion resistance, biocompatibility, antibacterial properties, and osteogenic potential were evaluated. Characterization showed a dense, uniform coating (∼5.6 ± 0.2 μm thick) that significantly improved corrosion resistance. In a seven-day hydrogen evolution test and long-term immersion study, the P2E0.5 coating reduced hydrogen release (0.57 ± 0.16 mL/cm 2 ) and mass loss (7.31 ± 0.83%). Biocompatibility tests (CCK-8 and live/dead staining) confirmed no cytotoxicity. Antibacterial tests showed inhibition rates of 75.8% for Escherichia coli and 83.43% for Staphylococcus aureus. ALP activity was 188.18% ± 37.56% of the control, indicating enhanced early osteogenesis. In summary, the MgF 2 -PDA-EGCG coating improves the corrosion resistance and biological properties of AZ31B magnesium alloy, supporting its potential for biomedical implants.
研究领域:
生物材料学
·
腐蚀科学
·
医学工程
✓ 已验证
产品关联
DOI
高影响因子
Plasmonics
·
2018
·Vol. 14
·期 1
·187-195
·
IF 2.366
Zhang Pengfei,Liu Le,He Yonghong,Chen Xiaoxia,Ma Kaijie,Wei Dong
We describe an Au-MgF 2 -Au trilayered waveguide-coupled surface plasmon resonance (WCSPR) sensor in this article. The characteristics of this sensing structure are compared with those of the conventional single-layered gold surface plasmon resonance (SPR) sensor theoretically and experimentally. The experiment results show that WCSPR can provide not only seven times smaller refractive index resolution in the bulk sensing application but also more accurate measurement results for the biomolecular interaction analysis than the conventional single-layered gold SPR. What’s more, this high-resolution sensor is easy to build and not sensitive to film thickness variations. The Au-MgF 2 -Au trilayered WCSPR may provide a simple and convenient chip-based strategy for performance enhancement of SPR sensors without varying the hardware and software of measurement instruments.
研究领域:
传感器技术
·
光学
·
生物医学工程
✓ 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）