Polymers
·
2023
·Vol. 15
·期 5
·1064
·
IF 5
Lijun Gao,Liuyang Li,Yunqiu Li,Congcong He,Liming Zhou,Xiongwei Qu,Shaoming Fang
A europium complex with double bonds was synthesized with crotonic acid as the ligand and a europium ion as the center ion. Then, the obtained europium complex was added to synthesized poly(urethane-acrylate) macromonomers to prepare the bonded polyurethane-europium materials by the polymerization of the double bonds in the complex and the poly(urethane-acrylate) macromonomers. The prepared polyurethane-europium materials had high transparency, good thermal stability and good fluorescence. The storage moduli of polyurethane-europium materials are obviously higher than those of pure polyurethane. Polyurethane-europium materials exhibit bright red light with good monochromaticity. The light transmittance of the material decreases slightly with increases in the europium complex content, but the luminescence intensity gradually increases. In particular, polyurethane-europium materials possess a long luminescence lifetime, which has potential applications for optical display instruments.Keywords:europium complex;polyurethane;composite;transparency;photoluminescence
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CHEMISTRY & BIODIVERSITY
·
2012
·Vol. 9
·期 9
·1916-1922
·
IF 1.804
Zhihan Xu,Chengyue Zhang,Yue Zhang,Xiaoda Yang
Measurement of paracellular permeation is an important assay for tight-junction investigations of drug toxicity, especially for metal-based drugs, and routine validation of the integrity of cell monolayers for models of drug absorption. Great efforts have been made in discovery and validation of novel paracellular diffusion indicators. In the present work, we prepared three Eu complexes, i.e. , [Eu(dtpa)] (dtpa=diethylenetriaminepentaacetic acid), [Eu(dtpa)(BSA)], and [Eu(dtpa)(PLL)] (PLL=poly( L -lysine)), and tested their permeation properties on Madin Darby canine kidney (MDCK) cells. The experimental results showed that all three probes were nontoxic to MDCK cells, permeated across MDCK monolayer exclusively via the paracellular pathways, and responded well to the changes on tight junction with high correlation of P app values to the decrease of trans-epithelial electric resistance (TEER). In addition, time-resolved fluorescence assays were conducted in a high-sensitivity and background-free mode. All these results confirmed the Eu complexes as novel and practical paracellular indicators.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Yishuai Jing,Tianxin Kang,Peng Hu,Haibo Fan,Feng Teng,Xin Zhao,Jiaming Song
Recently, rare earth (RE) elements and their oxides have been attracting more and more attention in the field of photocatalytic degradation . Due to the unique 4 f electronic structure and optical properties , the RE element, europium (Eu), together with its oxides, are often used for surface modification of other photocatalysts . Nevertheless, the photocatalytic degradation property of europium oxide has been rarely reported. In this study, we synthesized Eu 2 O 3 nanoparticles via chemical precipitation and calcination processes, and performed surface modification by using surfactants as polyvinyl pyrrolidone (PVP) and hexadecyl trimethyl ammonium bromide (CTAB). Compared with pure Eu 2 O 3 nanoparticles and those synthesized with PVP, photocatalytic degradation efficiencies of Eu 2 O 3 nanoparticles synthesized with surfactant CTAB for degrading rhodamine B dye demonstrated to be improved by 16% and 12%, respectively. The ultraviolet-visible diffuse reflectance spectra measurements indicate that CTAB can increase the bandgap of Eu 2 O 3 due to the reduction of oxygen defects. Photoluminescence spectra demonstrate that the surfactant would affect the luminescence of Eu 3+ and carrier redistribution of energy levels.
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REACTIVE & FUNCTIONAL POLYMERS
·
2014
·
IF 2.822
Shuqi Fan,Xu Fei,Xiuying Wang,Jing Tian,Longquan Xu,Peng Yang,Yi Wang
A series of europium complexes containing polymeric reactivity groups have been successfully synthesized using a simple method. Among them, Eu(DBM) 2 (Phen)(MA), which has the best fluorescence properties and solubility, was polymerized with glycidyl methacrylate (GMA) for use as a novel UV-written polymer material. The Poly (GMA-co-Eu(DBM) 2 (Phen)(MA)) containing different proportions of europium were prepared, and their spectroscopic properties were investigated in detail. Polymer films with optimum proportions (a molar ratio between GMA and Eu(DBM) 2 (Phen)(MA) of 15) exhibited good UV light lithograph sensitivities, strong visible fluorescence intensities, high glass transition temperatures ( T g : >170 °C), good thermal stabilities ( T d : up to 295 °C) and solvent resistances after crosslinking. Micro patterns with smooth top surfaces were fabricated from the resulting polymer by using direct UV exposure and chemical development.
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Inorganic Chemistry Frontiers
·
2026
·
IF 6.4
Jingjing Xia,Weinan Dong,Shengrong He,Feng Jiang,Wenming Tian,Qi Sun,Meixin Hong,Lingchen Meng,Yu Zhang,Zhennan Wu,Tingting Li,Xue Bai
The rational engineering of material properties and spatial arrangements enabling micro–nano-optical waveguides is crucial for realizing photonic integration and particularly for processing ultracompact optical signal platforms. Rare-earth ions have narrow-band emission and long excited-state lifetimes stemming from stable 4f energy-level structures, which enable extremely low non-uniform linewidths and very small spectral spreads to achieve high-resolution and high-fidelity optical signal transmission in waveguides. Herein, we reported a low-loss optical waveguide with a coefficient of 6.4 × 10−3 dB μm−1 from the electric dipole 5D0 → 7F2 transition in one-dimensional europium nanoclusters, the minimum value for rare earth-based materials. The structural orientations and luminescence performance associated with optical waveguides have also been explored in depth. The effectively directed photon transport makes lanthanide-based metal nanoclusters promising candidates for active photonic elements.
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JOURNAL OF RARE EARTHS
·
2020
·Vol. 39
·期 5
·541-547
·
IF 3.104
Yingqi Wang,Wenqi Ma,Yuexin Song,Jingjing Chen,Jiao Xu,Dajian Wang,Zhiyong Mao
In this work, Eu 3+ doped SrTiO 3 powders were synthesized by sol-gel method and the influences of Eu 3+ dopants on the crystalline structure, microstructure morphology, electronic band-gap and photocatalytic performance for degradation of organic pollutant were investigated in detail. Research results reveal that the incorporated Eu 3+ ions in SrTiO 3 lattice are preferable to substitute the Sr 2+ -Ti 4+ ions pair by two Eu 3+ ions. The presence of Eu 3+ ions plays a significant role for the microstructure morphology of the SrTiO 3 powders, leading to the formation of smaller size nanoparticles with a higher specific surface area . The light absorption capability of the resulting materials is improved owing to the narrowing of the band-gap induced by Eu 3+ dopants . As a result, the enhanced photocatalytic activity application for photodegradation of Rhodamine B solution is demonstrated for the SrTiO 3 powders doped with Eu 3+ ions.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境化学
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2023
·Vol. 170
·期 7
·072509
·
IF 3.9
Jia-Zhuang Chen,Yu-Ke Zhong,Ya-Lan Liu,Mei Li,Wei Han,Wei-Qun Shi
The physicochemical properties of Eu cations in AlCl3-NaCl melts have been studied for the purpose of spent nuclear fuel recycling via electrochemical and spectroscopic methods. Eu metal dissolves in the AlCl3-NaCl melts to generate divalent europium and Al metal while releasing chlorine gas. The effect of Lewis acidity of melt on the electrochemical behaviors of Eu(II) has been studied. In Lewis base melt of AlCl3-NaCl, Eu(III), and Al(III) can be co-reduced at the potential between Al deposition and Eu(II) oxidation. With the enhanced Lewis acidity of the molten salt, Eu(II) diffusion becomes more facile. The in situ absorption spectra of Eu(II) in AlCl3-NaCl melts reveal that the complexation ligand of Eu(II) changes with the melt Lewis acidity, thereby affecting the electrochemical behaviors of Eu(II) species. In addition, the redox potential of the Eu(II)/Eu(III) conversion reaction is more positive than that of Sm(II)/Sm(III).
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POLYHEDRON
·
2018
·
IF 2.067
Chunxia Jiang,Yiping Tang,Zhi Zeng,Jinwei Gao,Maosheng Li,Yuhui Zheng
Europium incorporated molybdenum carbide (Mo 2 C) has been assembled at 800 °C based on a single step and the synthesis processes have been discussed. (NH 4 ) 6 Mo 7 O 24 ·4H 2 O has been employed as a precursor and p -phenylenediamine has been selected as the carbon source. In contrast to conventional organic dyes, this novel lanthanide-activated phosphor provides red luminescence in the form of higher monochromatic purity due to the parity forbidden transitions. More importantly, the emission intensity of 5 D 0 → 7 F 2 transition increased depending on the incorporation of europium ions and the most suitable doping concentration will be 0.3 mmol. The utilization of f – f transition of Eu 3+ in molybdenum carbide has made the red emission materials accessible for application in the area of display, electronics and bio-imaging.
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RSC Advances
·
2024
·Vol. 14
·期 41
·30037-30044
·
IF 3.9
Qiuping Li,Qianqian Wen,Zian Fang,Yidi Wang,Hongxia Ouyang,Qi Wang,Meng Wei
The development of novel rare earth fluorescent materials and the exploration of their applications have consistently been focal points of research in the fields of materials science and chemistry. In this work, a novel rare earth composite material with good photo-fluorescence properties and self-supporting has been prepared via a simple ultrasonic solvent reaction method. Initially, the Phen moieties is immobilized onto the surface of a self-supporting fiberglass paper using ICPTES, followed by the coordination of Eu(TTA)3 moieties with Phen moieties through a convenient ultrasonic solvent reaction. The resulting GF–Phen–Eu(TTA)3 has been characterized using FTIR, UV-Vis DRS, fluorescence measurements, and so on. The results indicate that the composite material exhibits strong fluorescent emission and presents a vivid red color under ultraviolet light. Further research has shown that the fluorescence of GF–Phen–Eu(TTA)3 strips demonstrated a pronounced quenching effect in response to some transition metal ions (1 mM). Hence, the rare earth composite materials presented here can be utilized not only for the production of optical materials, but also for the development of fluorescence sensing strips.
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ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Junyu He,Tongqing Sun,Min Li,Anshi Chu,Xiujuan Zhuang
The realization of stable single-component white light emission in metal halide perovskites is still challenging due to the fast halide ion migration and narrow luminescence bands. In this work, all-inorganic single CsPbCl x Br 3−x perovskite microplates with stable red-blue-green triple color light emission are prepared by introducing europium ions Eu 3+ as dopants. Eu doping effectively suppresses ion migration and enables two spatially separated halide phases with stable dual-wavelength emissions. Furthermore, the incorporation of Eu 3+ compensates for the absence of red-light emission, thereby yielding a superior white emission with exceptional quality. The color rendering index of triple-color-emitting perovskites can be tuned successfully by controlling the halogen ratios, and the optimal microplate achieved a Commissions Internationale de l’Eclairage (CIE) coordinates of (0.32, 0.32). The results present a new enlightenment for the preparation of low-cost single-component white light materials.
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ACTA PHYSICO-CHIMICA SINICA
·
2017
·Vol. 33
·期 2
·407-412
·
IF 0.767
YUAN Hong,ZHANG Jing,WEI Xue-Hong,FANG Hui-Min,YUAN Shi-Fang,WU Li-Xin
The incorporation of europium-substituted polyoxometalate (PM) into chiral amphiphiles is attractive for the fabrication of multifunctional chiral luminescent liquid crystalline materials. Chiral amphiphiles acted as good promoters to trigger the achiral PM to show induced supramolecular
chirality through electrostatic interactions, as illustrated by circular dichroism (CD) spectra. Differential scanning calorimetry (DSC), polarized optical microscopy (POM), and temperature-dependent X-ray diffraction (XRD) analysis confirmed that the organic/inorganic hybrid polyoxometalate
complex exhibited thermotropic mesomorphic behaviors. In a cast film, the complex displayed intrinsic luminescence that could be adjusted by accurately controlling the temperature. The electrostatic encapsulation of PM with chiral mesomorphic promoters provides an effective method for constructing
PM-based chiral luminescent liquid crystalline materials.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2018
·
IF 2.829
Alemtsehay Tesfay Reda,Dongxiang Zhang,Xin Lu
A composite material of europium hydroxide (Eu(OH) 3 ) and glycine (Gly) is synthesized successfully to produce single phase material (Eu(OH) 3 -Gly) which exhibits extremely selective capturing and high removal rate towards uranyl (UO 2 2+ ) ion in an aqueous solution. Eu(OH) 3 -Gly displayed distribution coefficient (K d ) of 3.23 × 10 7 mL/g and removal rate of 100% to lower UO 2 2+ ion concentration from 25 ppm to <1 ppb inside 15 min and these criteria place Eu(OH) 3 -Gly among the top existing adsorbents for such adsorption. Adsorption kinetics for UO 2 2+ follows pseudo-second-order model, proposing a chemisorption adsorption mechanism mainly via H 2 N-U-NH 2 and O-U-O interactions. Eu(OH) 3 -Gly showed good stability after the removal of uranyl ion as investigated by FT-IR and thermogravimetric analysis (TGA) methods. According to TG analysis, Eu(OH) 3 -Gly showed less weight loss (23.7%) after adsorption compared with that of before adsorption (32%), suggesting that the attachment of uranium to the adsorbent contributed for the improvement of the thermal stability of Eu(OH) 3 -Gly.
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