JOURNAL OF NON-CRYSTALLINE SOLIDS
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2017
·
IF 2.124
X.L. Yang,W.C. Wang,Q.Y. Zhang
The influence of BaF 2 on the physical and spectroscopic properties of Cr 3+ /Ho 3+ co-doped germanate glass is investigated systematically by differential scanning calorimeter , excitation and emission spectra , as well as dynamic decay lifetime. The intense and broad absorption band of Cr 3+ provides a selective pump scheme for obtaining an efficient 2.0 μm emission of Ho 3+ , the OH − absorption coefficient, on the other hand, is decreased as low as 1.08 cm −1 , which both highly conducive to obtain an intense 2.0 μm emission of Ho 3+ . In addition, the crystal-field parameter D q / B of Cr 3+ -doped glasses is also calculated to study the influence of BaF 2 on the local environment of activators and sensitizers. Further theoretic calculation shows that the largest absorption and emission cross-sections of Ho 3+ near 2.0 μm are as high as 4.6 and 5.2 (× 10 −21 cm 2 ) in the 10 mol% BaF 2 modified Cr 3+ /Ho 3+ co-doped glass and the maximum energy transfer efficiency from Cr 3+ to Ho 3+ is about 42.5%. All results suggest that this BaF 2 modified Cr 3+ /Ho 3+ co-doped glass is very suitable for a high-efficient 2.0 μm fiber lasers with flexible pump sources.
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高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
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2025
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IF 6
Yuanyuan Liu,Li Dong,Feiyao Qing,Qingmin Ji,Hengdao Quan
The development and synthesis of novel environmentally-friendly chlorofluorocarbon alternatives are in accordance with the global sustainability paradigm and represent a progressive response to contemporary technological demands. 2,3-dichloro-1,1,1,4,4,4-hexafluoro-2-butene (CFC-1316mxx) holds significant research value as a synthetic intermediate for the novel environmentally-friendly chlorofluorocarbon alternative 1,1,1,4,4,4-hexafluoro-2-butene (HFO-1336mzz). This study developed a Ru/BaF 2 catalyst based on BaF 2 as the support for the hydrogenation coupling of 1,1,1-trifluorotrichloroethane (CFC-113a) to synthesize CFC-1316mxx. The physical/chemical properties of Ru/BaF 2 before and after reaction were analyzed by methods of XRD, BET, SEM, TEM, XPS, TG, H 2 -TPR, and NH 3 -TPD, and its catalytic performance in the reaction was also evaluated. Ru/BaF 2 features suitable acidity, adequate reducibility, appropriate specific surface area and pore structure, and exceptional thermal stability. Moreover, Ru/BaF 2 exhibits excellent catalytic activity, selectivity and stability, with a CFC-113a conversion rate of 93.81 % and a CFC-1316mxx selectivity of up to 96.04 %. As BaF 2 may also act as a “chlorine absorber” to inhibit catalyst deactivation, the conversion rate can remain at 71.00 % with a high selectivity of 95.21 % after 100 h of use. Based on the structural analysis of catalysts and the distribution of products, the reaction mechanism was also speculated.
研究领域:
催化化学
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环境化学
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材料科学
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可持续化学
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含氟化学品合成
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高影响因子
ACS Applied Materials & Interfaces
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2025
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IF 8.2
Lei Wang,Qin Chen,Shaoyun Guo,Xianlong Zhang
Ionizing radiation dosimetry is critical in medical and industrial applications, yet conventional dosimeters often lack visual readability and sufficient detection sensitivity. Current radiochromic photonic materials offer wavelength-based dose visualization but face complex fabrication. Here, we develop a novel X-ray-responsive photonic film by magnetically assembling the carbon-encapsulated Fe3O4 (Fe3O4@C) nanochains in a GelMA precursor encapsulated by BaF2 plates. The BaF2 scintillator converts X-rays to UV light, inducing GelMA cross-linking and volumetric contraction, which modulates structural color changes of photonic films. Finite element simulation analysis confirms that radiochromic behaviors stem from a reduction in interparticle spacing of Fe3O4@C nanoparticles (Fe3O4@C NPs) along the nanochains direction. The optimized film (B0.5/Fe4/1L/S-1) achieve a low detection threshold (6 Gy), high sensitivity (4.62 Gy), and linear dose–response (R2 = 0.981, 0–10 Gy). This study integrates scintillator energy conversion with photonic structural color changes, enabling real-time, naked-eye X-ray dosimetry with potential applications in low-dose monitoring.
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PubMed
高影响因子
LANGMUIR
·
2023
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IF 3.9
Yang Wu,Junhao Jing,Xiaojiang Li,Wenjian Yue,Jie Qi,Na Wang,Hongsheng Lu
A new form of surfactant-free microemulsion (SFME) including hydrophobic deep eutectic solvent (HDES)/ethanol/water was constructed based on its CO2 response, and three regions, that is, HDES-in-water (HDES/W), bicontinuous (B.C.), and water-in-HDES (W/HDES) regions, were recognized. It is anticipated that SFMEs with tunable microstructures have outstanding applications as nanoreactors in reaction processes. The feasibility of preparing nanoparticles from HDES/ethanol/water SFME using barium fluoride (BaF2) as a model nanoparticle was investigated. HDES-based microemulsions benefit from HDES’s excellent properties (novel, low toxicity, CO2-responsive, easy availability) and have potential in universal reactions, drug delivery, advanced material fabrication, etc. In this research, HDES-based microemulsions were prepared using HDES as the oil phase. Phase equilibria and microstructure were investigated using a ternary phase diagram, UV spectrophotometry, and the conductivity method. The CO2 switchable characteristics of the HDES-based microemulsions were investigated. HDES-based microemulsions were proposed as nanoreactors for the synthesis of barium fluoride nanomaterials. The microemulsion structure can modulate the size, morphology, and physicochemical properties of the nanoparticles through the CO2 switchable properties. It is argued that nanoreactors constructed with versatile HDES will offer a new direction for creation of cutting-edge scientific applications.
研究领域:
材料科学
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纳米技术
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化学工程
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PubMed
高影响因子
Catalysis Science & Technology
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2019
·Vol. 9
·期 6
·1338-1348
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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
TALANTA
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2022
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IF 6.556
Wenxin Cui,Zhaoqing Cai,Qing Li,Haiyun Qu,Jiaqian Zheng,Dengguang Yu,Junfeng Chen,Zheng Wang
In this study, a laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) method for in-situ determination of yttrium and trace elements in yttrium-doped barium fluoride (BaF 2 : Y) crystals was proposed. A facile, micro-damage procedure for quantifying the segregation coefficient of doping elements was investigated, and it was found that the actual yttrium doping concentration increases from the seed end to the tail end in BaF 2 : Y crystals. In micro-area analysis, this method has higher mass sensitivity which was applied to quantify the impurity content and distribution during the growth of BaF 2 : Y crystals. Regression coefficient of calibration curve for each element ranged from 0.9918 to 0.9995. Detection limits (DLs) were 0.05, 0.03, 0.01 and 0.01 μg g −1 for Mg, Zn, Sr and Pb, respectively. The accuracy of the proposed method was verified by inductively coupled plasma mass spectrometry/atomic emission spectroscopy (ICP-MS/AES) with wet-chemical pretreatment. The objective of the presented work was to provide a less damaging and more novelty approach for crystal sample analysis.
研究领域:
材料科学
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分析化学
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PubMed
高影响因子
ACS ES&T Engineering
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2021
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IF 0
Lichun Li,Xiaoli Wei,Shenglan Zhou,Zhongsheng Jia,Chuanzhao Wang,Houlin Yu,Sen Wu,Ying Li,Wenfeng Han
Hydrochlorofluorocarbon (HCFC) has been widely applied as the third-generation refrigerant globally, however, the global warming potential of such gases is often 100 and 1000 times higher than that of CO2. Dehydrochlorination reaction offers an encouraging strategy to transform the high-global-warming-potential gases of hydrochlorofluorocarbons (HCFCs) to low-global-warming-potential gases of hydrofluoroolefins (HFOs). However, the handling of a large amount of byproduct HCl remains one of the major challenges blocking the industrialization of dehydrochlorination of HCFC-142a for the production of vinylidene fluoride (VDF). A one-pot cascade reaction combining dehydrochlorination of HCFC-142b and hydrochlorination of acetylene was first proposed to spontaneously produce valuable monomers of VDF and vinyl chloride monomer (VCM) while eliminating the tedious HCl treatment step. Both thermodynamic calculations and experimental results validate the feasibility of the cascade reaction. Five different heterogeneous catalysts were screened for the proposed cascade reaction, including monocomponent catalyst BaF2, NAC, bifunctional BaF2/NAC catalyst, and bicomponent BaF2-NAC-S and BaF2-NAC-M catalysts. Among them, the mixed BaF2-NAC-M catalyst demonstrated the best catalytic performance, with BaF2 mainly acting as the dehydrochlorination site and NAC mainly acting as the hydrochlorination site. The corresponding reaction mechanism was also proposed.
研究领域:
化学工程
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催化
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环境化学
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绿色化学
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危险品化学品经营许可证（带存储）