MICROCHIMICA ACTA
·
2014
·Vol. 181
·期 15
·1957-1963
·
IF 3.719
Ding Shou-Nian,Li Chun-Mei,Gao Bu-Hong,Kargbo Osman,Wan Neng,Chen Xi,Zhou Chan
Fluorescent gold nanoclusters (Au-NCs) were synthesized by a one-pot method using 11-mercaptoundecanoic acid as a reducing and capping reagent. It is found that the red fluorescence of the Au-NCs is quenched by the introduction of Eu(III) at pH 7.0, but that fluorescence is restored on addition of phosphate. The Au-NCs were investigated by transmission electron microscopy and fluorescence photographs. The effect of pH on fluorescence was studied in the range from pH 6 to 10 and is found to be strong. Based on these findings, we have developed an assay for phosphate. Ions such as citrate, Fe(CN) 6
3− , SO 4
2− , S 2 O 8
2− , Cl − , HS − , Br − , AcO − , NO 2
− , SCN − , ClO 4
− , HCO 3
− , NO 3
− , Cd 2+ , Ba 2+ , Zn 2+ , Mg 2+ , and glutamate do not interfere, but ascorbate and Fe 3+ can quench Au-NCs fluorescence. The fluorescent nanocluster probe responds to phosphate in the range from 0.18 to 250 μM, and the detection limit is 180 nM. The probe also responds to pyrophosphate and ATP.
Off/on fluorescence sensor for phosphate based on Eu 3+ -modulated Au NCs thanks to the competition of oxygen-donor atoms from phosphate with those from the carboxylate groups was developed
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2017
·Vol. 313
·期 2
·309-318
·
IF 1.282
Wang Zhipeng,Huang Huang,Ding Songdong,Hu Xiaoyang,Zhang Lirong,Liu Ying,Song Lianjun,Chen Zhili,Li Shimeng
Abstract Two diglycolamide homologs, N,N,N′,N′ -tetraoctyl-3,6-dioxaoctane diamide (DOODA) and N,N,N′,N′ -tetraoctyl-3,6,9-trioxaundecane diamide (TOUDA), were synthesized. Their extraction behaviors of Am 3+ and Eu 3+ were investigated and compared with those of N,N,N′,N′ -tetraoctyl-3-oxapentane diamide (TODGA). The extraction ability toward Am 3+ and Eu 3+ decreased with increasing etheric oxygen number in the extractant structure. In contrast to TODGA, an very interesting inversion on the selectivity occurred for DOODA and TOUDA, which were more favor of extracting Am 3+ than Eu 3+ . The maximum SF
Am/Eu of 3.5 for DOODA can be achieved at 3.0 mol/L HNO 3 . The stoichiometries of extracted species and extraction thermodynamic parameters were also presented. Graphical Abstract
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Gao Jie,Li Qian,Wang Caihong,Tan Hongliang
A ratiometric fluorescent probe is described that is based on a functionalized europium(III) coordination polymer (Eu/DPA-TA). It can be fabricated by using dipicolinic acid (DPA) as a bridging ligand (to sensitize the Eu 3+ fluorescence) and terephthalic acid (TA) acting as a functional ligand to recognize the hydroxy radical ( • OH). The quenching of Eu 3+ fluorescence (measured at excitation/emission wavelengths of 288/615 nm) by water is strongly reduced in the presence of TA. This leads to a significant enhancement in the emission lifetime and intensity of Eu 3+ . Upon the addition of • OH, the fluorescence of Eu/DPA-TA showed ratiometric changes in that the TA sensitized fluorescence (peaking at 445 nm) is switched on, while the plain Eu 3+ fluorescence (peaking at 615 nm) decreases. This finding led to a method for the ratiometric (2-wavelength) detection of OH˙ with a 0.5 μM detection limit. The method also allows OH˙ to be detected with bare eyes at OH˙ concentrations as low as 10 μM. In our perception, this study paves the way towards the design of new functionalized lanthanide coordination polymers for fluorometric assays and biomedical imaging.
Schematic of a ratiometric fluorescent assay for the detection of hydroxy radical ( • OH) based on the use of a europium(III)/dipicolinic acid coordination polymer (Eu/DPA CP) functionalized with terephthalic acid (TA). A gradual color change from red to blue can be observed and correlated to • OH concentrations.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2024
·Vol. 333
·期 6
·2691-2696
·
IF 1.5
Wang Yi,Yang Jiajia,Sui Jixue,Wang Lan,Tang Jia,Yang Yu,Lu Yunyun,Dai Shuang,Cao Qi
Efficient separation of europium (Eu) from aqueous solution is pivotal for the sustainable development of nuclear industry and rare earth industry. In this work, bis(2-ethylhexyl) phosphate (P204) was employed to separate Eu(III) by solvent extraction method using kerosene as diluent. The extraction equilibrium could reach within 30-min contact time. The extraction ratio enhanced as the increased O:A phase ratio, extractant concentration, and temperature. However, the HCl introduction caused its clear descent. Combined with the slope method and FT-IR analysis, extraction mechanism could be unveiled, which is the coordination between P=O double bond and Eu(III) ions in a proportion of 3:1.
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LANGMUIR
·
2014
·
IF 4.384
Qiong Li,Jianan Zhang,Wei Sun,Jiangbo Yu,Changfeng Wu,Weiping Qin,Daniel T. Chiu
We report on a europium-complex-grafted polymer for preparing stable nanoparticle probes with high luminescence brightness, narrow emission bandwidth, and long luminescence lifetimes. A Eu complex bearing an amino group was used to react with a functional copolymer poly(styrene-co-maleic anhydride) by the spontaneous amidation reaction, producing the polymer grafted with Eu complexes in the side chains. The Eu-complex-grafted polymer was further used to prepare Eu-complex-grafted polymer dots (Pdots) and Eu-complex-blended poly(9-vinylcarbazole) composite Pdots, which showed improved colloidal stability as compared to those directly doped with Eu-complex molecules. Both types of Pdots can be efficiently quenched by a nile blue dye, exhibiting much lower detection limit and higher quenching sensitivity as compared to free Eu-complex molecules. Steady-state spectroscopy and time-resolved decay dynamics suggest the quenching mechanism is via efficient fluorescence resonance energy transfer from the Eu complex inside a Pdot to surface dye molecules. The amplified quenching in Eu-complex Pdots, together with efficient cell uptake and specific cell surface labeling observed in mammalian cells, suggests their potential applications in time-resolved bioassays and cellular imaging.
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INTEGRATED FERROELECTRICS
·
2021
·
IF 0.836
Peisong Tang,Xuezhi Wei,Liqin Zhang,Ruipeng Hou,Yifan Zhou
Using Eu2O3 as source of tritium, anhydrous ethanol as solvent system, three β-diketone compounds of 2-thienyl trifluoroacetone (TTA), acetylacetone (Hacac), 1-(4-Methoxyphenyl)- 3-(4-tert-butylphenyl)-1,3-propanedione (Avobenzone) as first ligand and 1,10-phenanthroline (Phen) as second ligand, the three kinds europium (III) ternary complexes were prepared by precipitation method at 60 °C. The complexes were characterized by fluorescence spectroscopy (FS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetry and differential scanning calorimetry (TG-DSC) and color coordinates. The results show that three red light-emitting europium (III) ternary complexes can emit strong red characteristic fluorescence. Thereinto, Eu(TTA)3Phen has the best luminescent performance. The excitation spectrum of Eu(TTA)3Phen is 395 nm, the characteristic emission peak is at 612 nm, and the color coordinate is (0.66, 0.34). Eu(TTA)3Phen show good thermal stability which is decomposed more than 200 °C.
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DYES AND PIGMENTS
·
2021
·
IF 4.889
Teng Guo,Xin Hu,Guang Yang,Wei Long,Shengxian Yu,Jianwen Tian,Meiying Liu,Xiancai Li,Xiaoyong Zhang,Yen Wei
The fluorescent nanomaterials based on rare earth metal complexes have become one of the promising candidates for biomedical applications due to their unique optical properties . However, direct utilization of these rare earth complexes in biological systems is challengable for their poor water solubility. In this work, an ultrasonic treatment-assisted crosslinking reaction was developed for the first time to synthesize the fluorescent amphiphilic copolymers (named as Eu (TTA) 3 phen-HCCP-PEG), in which the hydrophobic europium complexes (Eu (TTA) 3 phen-NH 2 ) and hydrophilic polyethylene glycol were conjugated together using hexachlorocyclotriphosphazene (HCCP) as crosslinking agent. The reaction could be occurred uner room temperature , mild reaction conditions without using catalysts. Owing to the amphiphilicity of Eu (TTA) 3 phen-HCCP-PEG, fluorescent nanoparticles can be formed in aqueous solution. Thereinto, the uptake behavior of Eu (TTA) 3 phen-HCCP-PEG by cells and cell toxicity testing were also utilized to evaluate their potential applications in biomedical fields. Results demonstrated that these fluorescent nanoparticles are of small size, high water dispersibility and low toxicity. The above results implied that Eu (TTA) 3 phen-HCCP-PEG could be potentially for biological imaging and imaging-guided drug delivery etc.
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JOURNAL OF RARE EARTHS
·
2021
·
IF 3.712
Lu Liu,Jingjie Yu,Shikao Shi,Jiye Wang,Huihua Song,Ruikang Zhang,Lianshe Fu
The design and fabrication of rare earth ions incorporated into the inorganic/organic hybrid materials have attracted growing attention for seeking improved optical properties and photofunctional performances. In this paper, a novel hybrid composite based on the layered rare earth hydroxides was successfully prepared by the ion-exchange and intercalation chemical process. The rare earth elements in the composite contain gadolinium (Gd) and europium (Eu) and the molar ratio of Gd to Eu is kept constant at 1.9 : 0.1. Organic sodium dodecyl sulfonate and dye coumarin-3-carboxyllc acid are simultaneously incorporated into the layered rare earth hydroxides as supporting agent and light-harvesting antenna, respectively. The resulting hybrid layered rare earth hydroxides exhibit the enlarged interlayer distance with about 2.60 nm, and the chemical composition was confirmed through X-ray diffraction, carbon, hydrogen and nitrogen (CHN) elemental analysis , infrared spectroscopy, and thermogravimetric analysis . The layered solid compound shows the characteristic red emission corresponding to the 5 D 0 → 7 F 2 transition of Eu 3+ ion, and the luminescence intensity of the optimized compound is greatly enhanced as compared to its corresponding nitrate and the hybrid composite without the introduction of dye molecule. The hybrid layered rare earth hydroxides can be exfoliated into bright colloidal solution, which show superior recognition capability to Cu 2+ ion with the distinct luminescence quenching . The large quenching constant (1.4 × 10 4 L/mol) and low detection limit (0.35 μmol/L) are achieved for Cu 2+ ion, implying a “turn-off” fluorescent sensor for Cu 2+ detection. Moreover, a transparent film was prepared based on the colloidal solution and displays the typical red emission in folded shape. The new hybrid compound with enhanced luminescence and excellent photofunctional performances is expected to be applied in the fields of fluorescent sensing and flexible optical devices.
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MRS Advances
·
2022
·Vol. 7
·期 30
·736-740
·
IF 0
Guo Yong,Tan Junlang,Zhao Jingchang
In this work, (La, Eu) co-doped CaCu 3 Ti 4 O 12 ceramics (Ca 1− x La x Cu 3 Ti 4− x Eu x O 12 (CLCTEO)), x = 0.1, 0.3, and 0.5) were prepared by the solid-state method. The phase structure, morphologies, dielectric properties, and impedance spectrum were investigated methodically. The XRD of CLCTEO ceramics confirmed the formation of the complex perovskite with a residual amount of CaTiO 3 . The refined calculation found that the lattice parameter of CLCTEO ceramics will significantly increase due to the co-doping of La and Eu. The FESEM analysis shows that the grain size of co-doped CCTO is smaller, reaching the nanometer scale. Impedance indicates that the (La, Eu) co-doped CCTO ceramics have higher dielectric permittivity than the single-doped with La or Eu. The results show that co-doping is an effective method to improve the dielectric properties of CCTO ceramics. Graphical abstract
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Shuyu Qin,Haoyi Wu,Junhao Peng,Yuanmin Zhu,Huafeng Dong,Wei Zhang
The contamination of wastewater by pharmaceuticals and personal care products (PPCPs) poses a significant threat to environmental and human health, necessitating innovative and efficient purification strategies. Photocatalysis is a promising approach for PPCPs degradation, however, optimizing solid-liquid interfacial adsorption and charge transfer remains a major challenge. Here, we introduce a novel europium (Eu) single-atom anchored TiO 2 photocatalyst, which simultaneously enhances adsorption capacity, light absorption range, and charge transfer efficiency, leading to unprecedented photocatalytic performance. Experimental and theoretical investigations reveal that Eu decoration lowers the adsorption potential of TiO 2 , significantly improving its ability to adsorb O 2 , H 2 O, and pharmaceuticals, the typical PPCPs. The introduction of 5d electrons from Eu creates a donor level below the conduction band, extending TiO 2 ’s absorption from the ultraviolet to the visible spectrum while improving adsorption and accelerating charge transfer at the solid-liquid interface. The yield of superoxide radicals rises significantly, while the reaction probability for pharmaceutical molecules is raised through the strong surface attraction. Consequently, the pharmaceutical-degradation efficiency increases by up to 27-fold under visible light and 3.9-fold under UV irradiation. This work presents a paradigm shift in photocatalytic water purification, offering a scalable and efficient strategy for tackling PPCPs contamination in wastewater. By unveiling a new mechanism for single-atom-enhanced photocatalysis, this study provides critical insights into the design of next-generation catalysts for sustainable water treatment.
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Additive Manufacturing
·
2023
·
IF 11
Aiping Lin,Yang Zhang,Danjiao Zhao,Yu Wu,Shufen Wang,Jianmin Li,Lanlan Fan,Shixian Xiong,Lei Cao,Feng Gu
Flexible techniques for producing luminescent patterns with high-resolution and moderate efficiency at the microscale are potentially important for pattern display, customized anti-counterfeiting and data security. An innovative droplet-based aerosol jet printing procedure has been developed for the creation of prominently luminescent patterns of europium-doped yttrium oxide (Y 2 O 3 :Eu 3+ ) inorganic phosphors in case of a rather low calcining temperature. Microscale luminescent patterns of pomegranate-shaped Y 2 O 3 :Eu 3+ nanospheres were effectively created by synchronizing the droplet deposition behavior and the microreactions therein. The deposition temperature was crucial to the pattern development accompanying a morphological transformation from dense film to spherical nanostructures by providing an anisotropic evaporation regime. The red emission of the printed luminescent patterns was nearly identical to that of the equivalents calcined at 1000 °C, indicating the possibility for future applications in flat panel display systems.
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DENTAL MATERIALS
·
2019
·
IF 4.44
Lei Li,Dan Li,Wenwen Zhao,Qing Cai,Gang Li,Yunhua Yu,Xiaoping Yang
Objective The object is to find an easy but efficient way to illustrate the in-situ dispersion of nano-scaled one-dimensional fillers in composite resins, and to correlate their dispersion status with the properties of composite resins. Methods Fluorescent europium-doped hydroxyapatite nanowires (HANW:Eu) were synthesized via the hydrothermal method . The HANW:Eu was mixed into Bis-GMA/TEGDMA (60/40, w/w) at different contents (1–5 wt.%), and different processing methods (kneading, grinding, stirring) were tested to achieve good dispersion of HANW:Eu with the aid of fluorescent imaging system. Then, the mixtures of HANW:Eu and barium glass powder (BaGP) were kneaded into resin at a fixed content (70 wt.%) while at different mixing ratios. In addition to the 3D fluorescent imaging, characterizations were carried out on mechanical properties , fractured surface, wear resistance and polymerization shrinkage, to correlate the composite properties of with the dispersion status of the incorporated HANW:Eu. Results By doping calcium with 5 mol.% of europium , the obtained HANW:Eu displayed strong fluorescence, which made the illustration of its in-situ dispersion status within composites being possible. And this helped to judge that kneading was more efficient to homogeneously disperse HANW:Eu than grinding and stirring. However, it was illustrated vividly that HANW:Eu aggregated severely when it was co-incorporated with BaGP into composites at the total content of 70 wt.%, which had not been previously revealed by other microscope observations. In comparison with composites containing 70 wt.% of BaGP, improvements in the mechanical properties of resulting composites were identified for the cases containing 3 wt.% of HANW and 67 wt.% of BaGP, however, their wear volume loss and the polymerization shrinkage did not decrease as expected due to the HANW aggregations. Significance The fluorescent filler prepared in this study provides a feasible strategy to illustrate the in-situ dispersion status of inorganic fillers, which provides guidance for the processing of composite resins.
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