JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2024
·
IF 3.2
Qi Zhang,Guoyu Zhao,Qingxian Zhao,Xian Wei,Wei Wei
Ultrathin and transparent scintillator films for X-ray microscopic imaging are urgently desired to accurately detect the internal tiny structure of objects in nondestructive way. However, it is great difficulty for the commercial scintillators (e.g., CsI:TI, LYSO:Ce) to obtain the ultrathin single crystal scintillators below 50μm. Additionally, scintillator powders such as Gd 2 O 2 S:Tb, when embedded in polymeric matrix, demonstrate significant scattering resulting from their opacity and substantial thickness. Here, we present a novel ultrathin (∼46μm) and transparent (∼90%) LaF 3 :Tb,Ce-polyvinyl alcohol (PVA) composite scintillator film with ultra-high loading content (∼85wt%) for high resolution X-ray microscopic imaging. It is obtained by thoroughly mixing directly precipitated LaF 3 :Tb,Ce nanocrystals (∼13nm) prepared by direct precipitation and PVA solution, followed by scraping and drying. The harmless solvent and low preparation temperature (below 100℃) contribute to its convenient and eco-friendly nature. More importantly, the film realizes high spatial resolution of 7μm thanks to its ultrathin and transparent feature.
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DOI
高影响因子
Catalysis Science & Technology
·
2019
·Vol. 9
·期 6
·1338-1348
·
IF 5.726
Jinchao Wang,Wenfeng Han,Shucheng Wang,Haodong Tang,Wucan Liu,Ying Li,Chunshan Lu,Jianjun Zhang,Eric M. Kennedy,Xiaonian Li
Catalytic coupling of CH4 with potent greenhouse gas CHF3 to vinylidene fluoride (VDF) was investigated over composite catalysts. Carbon-partitioned LaF3–BaF2 catalysts were prepared by PVDF (polyvinylidene fluoride)-mediated calcination. During catalyst preparation, PVDF functions as the fluorine source and carbon source. Compared with the catalysts prepared by the conventional HF co-precipitation method, the transformation of LaF3 and BaF2 to Ba1−xLaxF2+x solid solution is inhibited as Ba and La are separated by carbon layers derived from the decomposition of PVDF. The Ba1−xLaxF2+x phase is not favorable for the coupling of CH4 with CHF3 to VDF. In addition, PVDF-mediated calcination facilitates the formation of LaOF which is one of the key species for coupling of CH4 with CHF3 to VDF. O− species, which is the most active oxygen species for the activation of CH4, increases significantly following PVDF-mediated calcination due to the formation of LaOF. Consequently, the formation rate of VDF over the catalyst derived from PVDF-mediated calcination is 3.6 times higher than the HF co-precipitation catalyst at a reaction temperature of 700 °C. The formation rate of the HF co-precipitated catalyst declines to nearly half of the initial rate in a time-on-stream of 15 h. By contrast, only slight deactivation is observed over the catalyst prepared by PVDF-mediated calcination. The present work provides a promising strategy for the preparation of composite catalysts.
研究领域:
化学工程
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材料科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2021
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IF 4.821
Yuanyuan Duan,Yongli Yu,Limei Wang,Shuang Zhao
In this work, a facile method for the preparation of dual-emission lanthanide nanoparticles (NPs) was developed. Tb 3+ -doped LaF 3 NPs coated with 2,6-pyridinedicarboxylic acid (DPA) and Eu 3+ , namely LaF 3 :Tb@DPA-Eu NPs, could produce characteristic emissions of Tb 3+ and Eu 3+ under 272 nm excitation, which originated from the absorption of DPA. The LaF 3 :Tb@DPA-Eu NPs with tunable emission peaks and color could be synthesized by changing the concentration of Eu 3+ . Additionally, the obtained NPs were comprehensively characterized by various analytical methods. Transmission electron microscopy (TEM) images showed that the average size of the NPs was ~15 nm. Moreover, X-ray diffraction (XRD) analysis revealed that the products were single-phase LaF 3 , while the doped Tb 3+ entered the LaF 3 lattice to occupy the La 3+ sites. Owing to their excellent water solubility and good optical properties , the LaF 3 :Tb@DPA-Eu NPs were used as a fluorescence probe for the detection of marbofloxacin (MAR) based on the fluorescence quench. Notably, an effective ratiometric fluorescence method was established. The approach exhibited good sensitivity and selectivity with a linear range of 0.10 ~ 10.0 μM and detection limit of 85 nM. It was successfully employed for the determination of MAR in milk samples with recoveries of 98.1%–106%. Thus, the fluorescence method based on the LaF 3 :Tb@DPA-Eu NPs developed herein provides a convenient and fast platform for the detection of MAR.
研究领域:
分析化学
·
材料科学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Jing Pan,Yongde Yan,Yuan Deng,Xuepeng Wang,Li Ding,Xin Kong,Yun Xue,Fuqiu Ma,Kai Zhu,Wei Liu
Electrolyte is considered to be one of the key factors affecting electrolysis in the rare earth and their alloys industry. Generally, the fluoride system is chosen as the electrolyte for industrial production. However, the molten salt electrolysis method for fluoride-oxide systems is not well understood and has not been systematically studied at this stage. In order to supplement this part, lanthanum (La) ions have been chosen as the research object in this paper to systematically investigate the preparation of La–Ni alloy from LaF3–LiF-CaF2–La2O3 molten salt. A series of electrochemical methods were used to investigate the mechanism and kinetic properties of La(III) reduction on W and Ni electrodes. The electrochemical reduction properties and kinetic parameters of La were obtained. La–Ni alloy was prepared by potentiostatic electrolysis, and it was verified by detailed analysis through characterization methods. On this basis, LaNi5 intermetallic compound was successfully prepared on Ni electrode. This study provides valuable theoretical guidance for the development of La alloy preparation with fluoride salt systems in industry.
研究领域:
材料科学
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电化学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 20
·9196-9207
·
IF 2.7
Yaowei Hao,Qiaojun Nie,Xiaocao Cao,Jiafan Zheng,Kai Zhang,Jun Zheng,Haodong Wang,Yafang Zhao,Jiayi Liu,Zhiguang Lin,Ming Zhang,Zhongrong Shen
All-solid-state fluoride-ion batteries (FIBs) with a high theoretical energy density have attracted considerable attention due to their enhanced safety features and superior capacity. The selection of solid electrolyte materials with enhanced fluoride-ion conductivity is crucial for the successful implementation of high fluoride-ion energy storage in realistic scenarios. In this study, heterogeneous solid fluoride-ion electrolytes with different ratios of (LaF3)1−x(PbF2)x are investigated. In contrast to other research efforts focusing on the development of single-phase, single-lattice-defect solid-state electrolytes, the (LaF3)1−x(PbF2)x material incorporates two phases with different defects, namely fluoride vacancies and mobile fluoride ions. This unique combination of defects results in a significant enhancement in conductivity while maintaining their coexistence. The crystal gaps are filled by the orthorhombic phase, which is conductive, resulting in a reduction of the contact resistance due to the uniform distribution of the three crystal phases and the heterointerface between the hexagonal phase and the cubic phase. The multi-component electrolyte (LaF3)0.4(PbF2)0.6 exhibits the best performance among the samples tested. The electrolyte exhibits a high fluoride-ion conductivity, with a value of 2.78 × 10−4 S cm−1 at 120 °C and 6.37 × 10−6 S cm−1 at room temperature. The electronic conductivity is negligible with a value of 5.48 × 10−8 S cm−1. Furthermore, the electrolyte has an electrochemical stability window of 1.85 V vs. Sn/Sn2+. Due to its favorable electrochemical properties, this material has considerable potential as a solid-state fluoride-ion electrolyte.
研究领域:
材料科学
·
电化学
·
固态离子学
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能源存储
·
无机非金属材料
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DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2012
·
IF 3.696
Jiebing Ma,Peng Huang,Meng He,Liyuan Pan,Zhijun Zhou,Lili Feng,Guo Gao,Daxiang Cui
Development of multimodal contrast agents for in vivo simultaneous multimodality imaging is an emerging interdiscipline that is paving the avenue toward the goal of personalized medicine. Herein, folic acid-conjugated silica-modified LaF3:Yb,Tm upconversion nanoparticles (UCNPs@SiO2-FA) with high La content in a single particle were strategically designed and prepared for simultaneously targeting dual-modality imaging of upconversion luminescence (UCL) and X-ray computed tomography (CT). LaF3 UCNPs were synthesized by a novel oleic acid (OA)/ionic liquid (IL) two-phase system. Afterward, a folic acid molecule was covalently anchored on the surface of UCNPs with a silane coupling agent. The UCNPs@SiO2-FA exhibits good stability, water dispersibility and solubility, low cytotoxicity, good biocompatibility, highly selective targeting, excellent X-ray attenuation, and UCL emission under excitation at 980 nm. In vivo UCL and CT images of mice show the UCNPs@SiO2-FA can be used in targeting dual-modality imaging. These results suggest that the as-prepared nanoprobe is a good candidate with excellent imaging and targeting ability for targeting dual-modality imaging of UCL and CT.
研究领域:
生物医学工程
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纳米医学
·
分子影像学
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DOI
PubMed
高影响因子
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