ANALYTICAL CHEMISTRY
·
2026
·
IF 7.3
Min Fan,Jianxu Zhang,Sen Yin,Jingya Li,Ting Gao,Li Li,Yanyan Zhou,Hongfeng Li
Abstract l-Cysteine (Cys) levels are linked to many health issues and serve as critical diagnostic criteria for various diseases. However, their highly specific recognition and determination from complex biological matrices remain challenging due to interference from biothiol-containing analogs, such as homocysteine (Hcy) and glutathione (GSH). Herein, by strategically positioning eight aldehyde groups at the periphery of a dinuclear Eu(III) helicate, we achieved the specific determination of l-Cys via an induced negative circularly polarized luminescence (CPL) signal (gmax ≈ −1.22, 595 nm). 1H NMR and ESI-MS combined with single-crystal X-ray crystallography and DFT calculations revealed that the size match between the periphery pocket in the helicate and the thiazolidine ring formed by l-Cys and aldehyde cyclization contributed to this CPL response, which creates a large energy difference (∼37.6 kcal/mol) between diastereoisomers and a M-helical preference. While the L-Hcy only resulted in a weak and positive signal (glum ≈ 0.15) due to the larger ring size, the GSH was CPL silent due to the non-cyclization reaction. Benefiting from the large glum value, the probe exhibited the high sensitivity for l-Cys in water or bovine serum albumin (BSA), with a detection limit lower than 8.11 × 10–7 M. Additionally, to facilitate commercial applications, a “test strip-like” hydrogel hybrid film was prepared, which still retains sensing capability to l-Cys. This work therefore provides a strategy for l-Cysteine detection by virtue of induced helical chirality of metallosupramolecules and strong lanthanide CPL.
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高影响因子
MEASUREMENT
·
2023
·
IF 5.6
Xunlong Zhang,Quangan Cai,Ke Liu,Guilong Yan,Jingyu Chen,Yuanpeng Wu,Zhenyu Li,Li Wang,Han Li
Heavy metal pollutants seriously threaten people’s health. A sensitive, selective, and responsive method for the detection of heavy metal ions is necessary. Herein, flexible robust europium complex/cellulose acetate nanofiber (Eu/CA NF) luminescent membranes were prepared by the electrospinning method. The tensile length of this nanofiber membrane, which can be used in a variety of force scenarios, can be increased by 130% of its original length. These Eu/CA NFs showed unique specificity and good sensitivity in detecting Hg 2+ with its low limit of detection (LOD) of 3.09 μM and a specific recognition of Hg 2+ with a quenching rate of 97.32%. In addition, Eu/CA NF nanofibers were recyclable even after 50 times washing treatment. This study provides a convenient and effective super-sensitive detection thought for a trace amount of Hg 2+ in various water environments.
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RSC Advances
·
2023
·Vol. 13
·期 37
·25681-25690
·
IF 3.9
Jie Liang,Ting Fan,Jian-tao Lü,Tianjie Guan,Ting-ting Deng,Bangyun Xiong
NaGdF4:Ce,Eu,Tb nanocrystals were successfully prepared by a one-step hydrothermal method with Ce3+ ions as sensitizers, Eu3+ and Tb3+ ions as activators, and polyethylenimine (PEI) as surfactants. Color-adjustable fluorescence emission was achieved by the energy transfer effect between rare earth ions. Blue fluorescent carbon quantum dots (CDs) with a double UV response under 254 nm and 365 nm excitation were synthesized by a one-step hydrothermal method. A hydrophilic NaGdF4:Ce,Eu,Tb/CD composite ink was prepared by an easy physical mixing method. Because of the electrostatic self-assembly effect, the color adjustable luminescence was achieved in a few seconds, and the white light emission with color coordinates of (0.32, 0.32) was obtained. A dual-mode luminescence anti-counterfeiting pattern was designed and achieved by excitation with ultraviolet light at 254 nm and 365 nm.
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高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 10
·3060-3068
·
IF 5
Guanghua Liang,Jianyi Chen,Tao Dou,Zhijie Wu,Xiaofeng Li,Yuanshuai Liu
EU-1 zeolite is employed as an active component of a catalyst for isomerization or hydroisomerization of C8 aromatics (i.e., xylenes, ethylbenzene) in petrochemical processes to increase the para-xylene yield. However, conventional manufacturing of EU-1-based catalysts involves the production of mother liquors for zeolite synthesis which usually contain plentiful unreacted raw materials, or the negative impact of incorporated binders in mass transfer during reactions over shaped catalysts. Herein, we developed a novel route to prepare the monolithic EU-1 zeolite, and used it as an active component of a catalyst for hydroisomerization of ethylbenzene with meta-xylene. Recrystallization of the shaped zeolite precursors composed of incompletely crystallized zeolites with amorphous silica and alumina powders as binders in recycled mother liquor led to formation of the monolithic EU-1 zeolite. Transformation of binder species to a full-zeolitic phase was corroborated comprehensively by characterization methods. Compared with the conventionally fabricated counterpart, the monolithic EU-1 zeolite possessed similar mechanical strength, high crystallinity, and high acidity and, in particular, enhanced mesoporosity, which led to improved catalytic performances in hydroisomerization reactions. Our developed synthetic strategy provides an effective way to produce the monolithic EU-1 zeolite, but is also a reference for the sustainable production of other types of zeolitic materials for energy-related applications.
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RSC Advances
·
2023
·Vol. 13
·期 17
·11432-11440
·
IF 3.9
Yang Hu,Huazhang Zhang,Jing Zhou,Jie Shen,Binbin Chen,Ang Li,Wen Chen
The ferroelectric behavior of Bi1/2(Na0.8K0.2)1/2TiO3 has been tailored by Eu3+ doping and the intermediate relaxor state is utilized for tristate ferroelectric memory effect. As Eu3+ content increases, the local structural disorder tends to get enhanced and the stability of ferroelectric order gets weakened. The disruption effect of Eu3+ is manifested structurally in XRD and PL spectra, and electrically in the ferroelectric, dielectric and piezoelectric properties. We found that the BNKT:3.0%Eu which owns a relaxor state under electrical cycle would be suitable for tristate ferroelectric memory, where two ferroelectric states and the relaxor state are respectively served as the “±1” and “0” memory states. We designed the verification experiments, and the results show good feasibility and stability. Moreover, it is innovative using PL spectra of Eu3+ to understand the structural changes related to different memory states, owning to its sensitivity to local structural symmetry. It also implies the possibility for non-destructive optical readout.
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JOURNAL OF LUMINESCENCE
·
2018
·
IF 2.732
Minjia Meng,Mengqi Bai,Zulin Da,Yanhua Cui,Bingrong Li,Jianming Pan
Selective fluorescent molecularly imprinted membrane (FMIM) for salicylic acid (SA) was successfully prepared by phase inversion technique with SA as template molecule, chitosan (CHI) as functional polymer , and Eu(TTA) 3 phen/PAMAM composed of Eu(TTA) 3 phen and the dendrimer (PAMAM) as the fluorophore, which was characterized by SEM, AFM, and XPS techniques. The introduction of the hydrophilic Eu(TTA) 3 phen/PAMAM into FMIM was able to improve the flux and the adsorption capacity of SA with good fluorescent stability. Among the FMIM, the FMIM2 prepared with 2.0% Eu(TTA) 3 phen/PAMAM in the cast membrane fluid was the optimal fluorescent imprinted membrane for selective detection of SA, which displayed a relatively wider linear range and lower limit of detection (LOD) (24 mg L −1 ). The imprinted FMIM2 could selectively detect the SA from complicated samples without obvious interference from analogues compared to the non-imprinted FNIM2. Moreover, the FMIM had promising recycling performance. It can be potentially used as an alternative imprinted membrane for selective detection and separation of trace SA in water.
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OPTICAL MATERIALS
·
2018
·
IF 2.32
Xiaolin Zhang,Jianguo Tang,Haidong Li,Yao Wang,Xinzhi Wang,Yanxin Wang,Linjun Huang,Laurence A. Belfiore
This work demonstrated red light emitting nano-PVP fibers that incorporated with novel three-layer nanostructure of Ag@SiO 2 @Eu(tta) 3 phen nanoparticles (Ag@SiO 2 @Eu(tta) 3 phen-NPs), and the hybrid nano-PVP fibers were fabricated via a remarkably simple electrostatic spinning method. For Ag@SiO 2 @Eu(tta) 3 phen-NPs, the thickness of SiO 2 is optimized to obtain the maximum luminescent intensity , as results, the optimized thickness of SiO 2 is 20 nm. And the corresponding luminescent intensity (612 nm) of the Ag@SiO 2 @Eu(tta) 3 phen-NPs is enhanced up to 10 times compared with the pure Eu(tta) 3 phen complex, which indicates that with 20 nm SiO 2 thickness, the localized surface plasmon resonance (LSPR) effect of Ag@SiO 2 exhibits highest performance for enhancing luminescence. Moreover, the luminescent PVP fibers emit bright red light under the fluorescence microscope, which definitely confirms that the microenvironment provided by PVP polymer is absolutely suitable for the fluorescent composites.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2017
·Vol. 101
·期 3
·1266-1278
·
IF 2.841
Lin Chen,YeHua Jiang,XiaoYu Chong,Jing Feng
Thermal barrier coatings (TBCs) are one of the most important materials in gas turbine to protect the high temperature components. RETa 3 O 9 compounds have a defect-perovskite structure, indicating that they have low thermal conductivity, which is the critical property of TBCs. Herein, dense RETa 3 O 9 bulk ceramics were fabricated via solid-state reaction. The crystal structure was characterized by X-ray diffraction (XRD) and Raman Spectroscope. Scanning electron microscope (SEM) was used to observe the microstructure. The thermophysical properties of RETa 3 O 9 were studied systematically, including specific heat, thermal diffusivity, thermal conductivity, thermal expansion coefficients, and high-temperature phase stability. The thermal conductivities of RETa 3 O 9 are very low (1.33-2.37 W/m·K, 373-1073 K), which are much lower than YSZ and La 2 Zr 2 O 7 ; and the thermal expansion coefficients range from 4.0 × 10 −6 K −1 to 10.2×10 −6 K −1 (1273 K), which is close to La 2 Zr 2 O 7 and YSZ. According to the differential scanning calorimetry (DSC) curve there is not phase transition at the test temperature. Due to the high melting point and excellent high-temperature phase stability with these oxides, RETa 3 O 9 ceramics were promising candidate materials for TBCs.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Jie Chen,Yanhua Song,Ye Sheng,Meiqi Chang,Xiaoming Xie,Murad M.A. Abualrejal,Hongxia Guan,Zhan Shi,Haifeng Zou
Novel luminescent one-dimensional Ln 3+ (Eu, Tb) doped SiO 2 hollow nanofibers were successfully fabricated using a facile and economical co-axial electrospinning technique with subsequent calcination . The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) revealed that the as-obtained samples present obvious hollow morphology with an average diameter of 303 ± 11 nm and thin walls approximate 76 nm. For SiO 2 :xEu 3+ hollow nanofibers, the highest luminescence intensity, the longest lifetime and the largest quantum efficiency were both in the composition of 6 mol% Eu 3+ . The large value of R 21 indicated a highly disordered environment around Eu 3+ ions in the host, which was better for intense visible red emission. Meanwhile, the spectral characteristics and radiative properties were also analyzed according to the Judd-Ofelt theory from the emission spectra. What's more, under ultraviolet excitation, the emission colors of samples could be tuned from red to green, including bisque by doping Eu 3+ , Tb 3+ and co-doping Eu 3+ /Tb 3+ ions, which indicated the obtained SiO 2 :Ln 3+ hollow nanofibers are potential phosphors in nanostructured optical devices applications.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Xuemei Wei,Xiankui Cheng,Xinyu Zhang,Guodong Sheng,Huiting Xu
The utilization of biocompatible and inexpensive adsorbents for the effective scavenging of U(VI) and Eu(III) from wastewater is still an open challenge in nuclear waste management. Herein, three kinds of α-Fe 2 O 3 nanocrystals with different morphologies, i.e., α-Fe 2 O 3 nanospheres (HNSs), nanoplates (HNPs) and nanorods (HNRs), which were exposed (1 0 2), (0 0 1), and (1 1 0) facet, respectively, was used to scavenge U(VI) and Eu(III) from aqueous solutions via an adsorption procedure. Various techniques of N 2 adsorption–desorption, FT-IR, XRD, XPS, TEM, SEM and EDS were applied to characterize these adsorbents before or after adsorption. The results indicated that the adsorption capacity of U(VI) and Eu(III) was in the order of HNPs (0 0 1) > HNRs (1 1 0) > HNSs (1 0 2), namely, α-Fe 2 O 3 nanoplates was proved to be a good adsorbents, with removal capacity of 221 mg/g and 131 mg/g for U(VI) and Eu(III) scavenged on HNPs, respectively. The kinetics of U(VI) and Eu(III) scavenging agreed with the pseudo second order kinetic model, suggesting that chemical interaction is mainly responsible for U(VI) and Eu(III) scavenging on these materials. Furthermore, the Freundlich model fit the best for adsorption isotherms of U(VI) and Eu(III). The present study demonstrated that these α-Fe 2 O 3 nanocrystals are promising materials in nuclear waste management.
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TALANTA
·
2025
·
IF 6.1
Shuyun Zhu,Kunming Sun,Shuyi Liu,Qian Wang,Jiatong Fan,Xian-En Zhao,Guobao Xu
Flavonoid glycosides are formed by dehydration condensation of aglycones and sugar molecules. Therefore, discrimination of flavonoid glycosides from their corresponding aglycones is a challenging task because they contain the same aglycone part in their molecular structures. Herein, boric acid-functional Eu(III)-organic framework (BA-Eu-MOF) was applied to discriminate flavonoid glycosides including baicalin (Bai), wogonoside (Wog), rutin (Rut), puerarin (Pue), quercitrin (Que) and astragalin (Ast) from their corresponding aglycones for the first time. Besides as organic ligand to sensitize the luminescence of Eu 3+ through “antenna” effect, 5-boronobenzene-1,3 dicarboxylic acid provided recognition site for flavonoid glycosides. Infrared, fluorescence, UV–vis, and mass spectra were used to investigate the recognition reaction between BA-Eu-MOF and flavonoid glycosides. The data indicated that the cis -diols of flavonoid glycosides from sugars covalently bonded to boric acid group to form cyclic boronic esters, which quenched the fluorescence of BA-Eu-MOF at 620 nm through decreasing the intersystem efficiency, inner filter effect and photoelectron transfer. In contrast, aglycones could not alter the fluorescence of BA-Eu-MOF because of no covalent bond between them. This probe exhibited high sensitivity towards flavonoid glycosides with the low detection limits of 3.3 nM, 3.5 nM, 33 nM, 56 nM, 5.1 nM and 5.5 nM for Bai, Que, Wog, Ast, Pue and Rut, respectively. The unique recognition ability of boric acid group enables selective and sensitive detection of flavonoid glycosides without the interference of their corresponding aglycones.
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高影响因子
Journal of Physical Chemistry C
·
2025
·
IF 3.2
Taihe Li,Rongjingxi Tang,Lurun Xu,Jingchao Tao,Guo He,Zhuguo Li,Dongshi Zhang
Femtosecond laser synthesis and processing of colloids offer a platform for novel nanomaterial synthesis and applications, advancing side by side with high-end material innovations. In this work, RE2(Ce0.2Zr0.2Hf0.2Sn0.2Ti0.2)2O7 (RE = Sm, Eu, Er), one kind of A2B2O7-type (A = rare earth cation, B = tetravalent metallic cation) high-entropy oxide ceramic is chosen as the ablation target for colloid synthesis by femtosecond laser ablation in ethanol. Both surface structural and colloidal morphologies are analyzed to unveil the effects of photothermal (melting) and photomechanical (cracking) phenomena on colloid synthesis. High-resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) jointly show that the synthesized nanomaterials in different sizes and shapes are mainly in the amorphous state, irrespective of the pristine samples’ composition. Energy-dispersive X-ray spectroscopy (EDS) mapping of as-prepared colloids indicates the emergence of elemental segregation, mainly occurring to small particles (mainly <10 nm); whereas for large particles, multiple elements are homogeneous, reflecting the high entropy characteristic of the samples. The discovery of a tailed nanostructure with elongated void embedment indicates special spallation dynamics containing void freezing or bubble capturing. Our findings may help to better understand the ablation dynamics relative to ceramics’ colloid formation. RE2(Ce0.2Zr0.2Hf0.2Sn0.2Ti0.2)2O7 (RE = Sm, Eu, Er) are most frequently considered to be good candidates for next-generation thermal barrier coatings in the film form; downsizing the ceramic dimensions into nanoscale via laser synthesis in liquids may expand its widespread applications in various fields such as optics, photonics, environment, catalysis, and biomedicine.
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