COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
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IF 4.539
Qingmeng Dong,Zhouqi Tian,Wulin Song,Weiping Deng,Hongxi Zhang
The heterogeneous catalyst for depolymerization of lignin has a good application prospect because the catalyst is easy to recover. Although heterogeneous noble metal catalysts exhibit excellent activity under mild conditions, high prices restrict their wide use. In recent reports, nano rare earth oxide catalysts have shown good performance in the catalytic oxidation of lignin, and their prices are relatively low, which has good research value. Our study found that rare earth oxide nanocatalysts have obvious structure-activity relationship in the catalytic oxidation of lignin. To investigate theses structure-dependent behaviour and the reaction mechanism, a series of shape-specific Eu 2 O 3 nanocrystal catalysts (spheres, spindles, sheets and rods) with well-defined crystal facets were synthesized and investigated. The four catalysts show increasing conversions from 54.6% to 91.2% in the sequence of nanospindles, nanospheres , nanosheets and nanorods , under condition of 1 MPa O 2 , 493 K and 8 h. These results demonstrate that the Eu 2 O 3 nanocrystal is structure-sensitive. It is found that the surface crystal facets of Eu 2 O 3 nanocrystals play crucial roles in the catalytic properties. Among the nanocrystals, Eu 2 O 3 nanorods with well-defined (220) crystal facets displayed superior catalytic activity. It is deduced that the high reactivity of Eu 2 O 3 nanorods is related to the abundant lattice oxygen which is benefit to active oxygen species. A plausible reaction pathway that involves the Mars-van Krevelen mechanism was proposed.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 24
·期 43
·7669-7676
·
IF 3.756
Shengdi Ta,Huiting Zhang,Wenxia Wu,Yazhao Wang,Peng Zhang,Zeyu Cheng,Shoulei Xu,Bernard Albert Goodman,Wen Deng
The synthesis, structure, and optical properties are reported for a series of yttria-stabilized zirconia crystals in which some Y3+ was replaced by Eu3+. These crystals were grown by the optical floating zone (OFZ) method and were transparent without inclusions, cracks, or bubbles. They were all exclusively in the cubic phase, whereas the corresponding ceramic samples had a mixture of monoclinic and cubic phases. Absorption spectra showed a charge transfer band at 268 nm and a series of narrow peaks in the range 308–540 nm from Eu3+ f–f transitions. The crystals were efficiently excited at 393 nm, and exhibited excellent orange-red photoluminescence (PL) centred at 610 nm, from the 5D0 → 7F1 transition. The maximum PL intensity was observed with crystals prepared with 2.00 mol% Eu2O3, and compared with other rare earth ions; Eu3+-doped ZrO2–Y2O3 single crystals have a high concentration quenching threshold. The critical distance for Eu3+ ions was calculated as 11.8 Å, which indicates that multipole–multipole interactions dominate the non-radiative energy transfer between Eu3+ ions. Finally, the chromaticity coordinates (CIE) for all the samples were similar, and those for the (ZrO2)92(Y2O3)6(Eu2O3)2 crystal were (x = 0.6339, y = 0.3657) with a colour purity >98%.
研究领域:
材料科学
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光学
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晶体生长
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发光材料
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固体物理
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DOI
高影响因子
TALANTA
·
2023
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IF 6.1
Gaozhen Li,Jiashuai Sun,Jiahuan Li,Yaoli Zhang,Jingcheng Huang,Fengling Yue,Haowei Dong,Falan Li,Huihui Xu,Yanyin Guo,Yemin Guo,Xia Sun
In order to achieve a highly sensitive detection of procymidone in vegetables, three paper-based biosensors based on a core biological immune scaffold (CBIS) were developed, which were time-resolved fluorescence immunochromatography strips with Europium (III) oxide (Eu-TRFICS). Goat anti-mouse IgG and europium oxide time-resolved fluorescent microspheres formed secondary fluorescent probes. CBIS was formed by secondary fluorescent probes and procymidone monoclonal antibody (PCM-Ab). The first type of Eu-TRFICS (Eu-TRFICS-(1)) fixed secondary fluorescent probes on a conjugate pad, and PCM-Ab was mixed with a sample solution. The second type of Eu-TRFICS (Eu-TRFICS-(2)) fixed CBIS on the conjugate pad. The third type of Eu-TRFICS (Eu-TRFICS-(3)) was directly mixed CBIS with the sample solution. They solved the problems of steric hindrance of antibody labeling, insufficient exposure of antigen recognition region and easy loss of activity in traditional methods. They realized multi-dimensional labeling and directional coupling. They replaced the loss of antibody activity. And the three types of Eu-TRFICS were compared, among which Eu-TRFICS-(1) was the best detection choice. Antibody usage was reduced by 25% and sensitivity was increased by 3 times. Its detection range was 1–800 ng/mL, the limit of detection (LOD) was 0.12 ng/mL with the visible LOD (vLOD) of 5 ng/mL.
研究领域:
分析化学
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生物传感
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食品安全
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环境监测
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产品关联
DOI
PubMed
高影响因子
NUCLEAR ENGINEERING AND DESIGN
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2024
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IF 1.9
Changfu Wang,Lin Li,Xu Liu,Bobo Shao,Yan Liu,Yun Wang,Shengheng Tan,Zhirong Liu,Shengdong Zhang
The two-step vitrification process involves converting high-level waste from a liquid to a solid state through calcination , followed by melting the calcines with glass matrix material to form glassy wasteforms. The calcination process is a critical stage in the vitrification process. This study investigated the thermal decomposition performance and phase evolution of power reactor simulated high-level waste during the calcination process. As the calcination temperature increased from 100 to 900 °C, the resultant waste calcines showed increasingly darker color and smaller general particle sizes. Below 600 °C, the waste experienced thermal decomposition of nitrate and formate compounds, leading to an approximate 40 wt% weight reduction. At 600 °C, the waste's weight remained constant, and crystalline phases such as Zr x M 1-x O 2 (M = Ce, Pr, Nd), BaMoO 4 , CeO 2 , and Gd x Ce 1-x O 2 were observed.
研究领域:
核化学与化工
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放射性废物处理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Lefan Li,Tuanzhang Li,Pengfei Zhao,Jingyuan Guo,Chengpeng Li,Zhang Hu,Sidong Li,Chengyong Li
Continuous steam generation is still challenging for existing solar-powered interfacial evaporation systems due to insufficient sunlight exposure in overcast day and time from late afternoon to early morning. Here, we present a novel solar-afterglow driven interfacial evaporation system that leverages the effective absorption and thermal conversion stemming from the afterglow of strontium aluminate (SAO) and photothermal effects of the multi-walled carbon nanotubes/silver/polyacrylamide (MWCNTs/Ag/PAM). In virtue of these synergetic effects, this system demonstrates an evaporation rate of 2.91 kg·m −2 ·h −1 under one sun (1 kW m −2 ) in the daytime and an enhanced evaporation capacity of 5.61 kg·m −2 under SAO-induced afterglow overnight. This innovative strategy significantly broadens the utilizing solar energy and emitted fluorescence for continuous interfacial evaporation in seawater desalination.
研究领域:
材料科学
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环境科学
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能源工程
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2025
·
IF 3.6
Zhichao Zhang,Jun Zhou,Jintai Wen,Fangnan Liang,Fang Zhang,Qianxiu Liu,Jifan Hu
Currently, data-driven methodologies for discovering advanced luminescent materials are receiving considerable focus, driven by the potential to expedite material development timelines and provide multi-faceted insights into material properties. This study implements machine learning to develop a predictive model for emission wavelengths in Eu 2+ -activated A I B II PO 4 -type phosphors, thereby advancing rational design strategies. Furthermore, the model's performance is rigorously evaluated by synthesizing a novel Na 18 Ca 13 Mg 5 (PO 4 ) 18 :Eu 2+ phosphor and comparing its emitting wavelength with the value predicted by the model, showing satisfactory agreement. The compound Na 18 Ca 13 Mg 5 (PO 4 ) 18 exhibits a glaserite-type crystal structure and belongs to the R-3m space group of the Trigonal crystal system. The Eu 2+ -activated Na 18 Ca 13 Mg 5 (PO 4 ) 18 phosphor demonstrates intense broadband absorption spanning 250–400 nm in the near-ultraviolet region, emitting bright blue-cyan luminescence under 365 nm excitation. The high Ra (93.3) and low correlated color temperature (CCT: 5096 K) values of the as-fabricated w-LED lamp indicate that Na 18 Ca 13 Mg 5 (PO 4 ) 18 :Eu 2+ can act as a promising blue-cyan-emitting phosphor for full-spectrum healthy lighting applications.
研究领域:
材料科学
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机器学习
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光电子学
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固态照明
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晶体学
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发光材料
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数据驱动发现
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2025
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IF 3.6
Kuo Shen,Yahong Jin,Yanmei Li,Yihua Hu
Inorganic scintillator materials have garnered widespread attention due to their applications in high-energy X-ray detection and imaging. However, developing materials that possess both high thermal stability and the capability to provide high-resolution X-ray imaging remains a significant challenge in this field. This article reports the synthesis of Ba 1.31 Ca 0.69 SiO 4 inorganic scintillator materials doped with Eu 2+ and Dy 3+ through a high-temperature solid-phase method. Their structure, photoluminescent properties under visible light and X-ray excitation, and thermoluminescence characteristics were thoroughly characterized. Experimental results indicate that the material's traps were enriched through the aliovalent substitution of Dy 3+ , enhancing the afterglow at room temperature. Under 350 nm excitation, the material demonstrated excellent thermal stability (maintaining 90% of its intensity at 150 °C compared to 30 °C) and a high quantum efficiency (IQE = 96.64 %). Furthermore, under X-ray excitation, the material exhibits a high electron storage capacity, which can be read out under near-infrared light at 870 nm, and can be rapidly erased under heating conditions or under visible light at 470 nm. Finally, we prepared flexible films using the phosphor, demonstrating a spatial resolution of 11.9 lp/mm −1 under X-rays, as well as showcasing the real-time and delayed imaging capabilities of the flexible film under X-ray exposure.
研究领域:
材料科学
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光学
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医学影像
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Sihao Wang,Chaonan An,Yining Zhang,Xu Wang,Xuepeng Wang,Jing Pan,Fuqiu Ma,Yun Xue,Yongde Yan
Zinc Titanate (ZIT) glass-ceramic composite is a potential candidate waste form for immobilizing radioactive lanthanide oxides due to its relatively high lanthanide embedding capacity and low reaction temperature. However, the composition of lanthanide oxides after electrolytic refining is very complex and the immobilization mechanism of lanthanide oxides by ZIT composite is not clear. Herein, we prepared ZIT-PrEu glass-ceramic waste forms by a solid-phase sintering method at 1200 °C for 4 h using mixed lanthanide oxides of Pr 6 O 11 and Eu 2 O 3 simulated as radioactive waste. The XRD and SEM results show that different mixed lanthanide oxide ratios have very little effect on the composition and microstructure of ZIT-PrEu waste forms with different waste embedding rates. With the increase of waste embedding rate, the density of the ZIT-PrEu glass-ceramic waste forms with different mixed lanthanide oxide ratios first increases and then decreases. When the embedding rate increases to 25 wt%, the density of ZIT-PrEu waste forms with different mixed lanthanide oxide ratios reaches a maximum. The ZIT-PrEu glass-ceramic waste forms embedded with 25 wt% waste exhibit excellent chemical durability, and the leaching rates of Pr ion and Eu ion are only 10 −6 - 10 −7 g m −2 d −1 after 28 days at 90 °C. Moreover, the phase evolution of the ZIT composites immobilizing lanthanide oxides at different temperatures is revealed by XRD and FT-IR measurements. The lanthanides (Ln) are mainly present in the form of LnPO 4 monazite phases.
研究领域:
材料科学
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核废料管理
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zelong Jiang,Tao Hu,Fanchao Men,Hong Yang,Wei Lv,Dawei Wen,Qingguang Zeng,Yan Gao
The pursuit of efficient red emitting Eu 2+ doped oxide is endless, aiming to replace the state-of-the-art CaAlSiN 3 :Eu 2+ nitride counterpart to achieve cheaper and more stable warm illumination. Herein, we identify a hitherto unreported CaLuGaO 4 olivine compound. The crystal structure of the compound is belong to orthorhombic Pnma . Phonon dispersion relations have no imaginary frequency, verifying thermodynamic stability of the crystal structure. It structurally contains an octahedral Ca 2+ site that definitely has strong crystal field splitting energy, which motivates us to incorporate it with Eu 2+ to realize red emission through 4 f 6 5 d 1 → 4 f 7 transition of the octhdedral Eu 2+ ion. This goal is achieved as found the divalent Eu 2+ is necessarily stabilized in this site under CO sintering atmosphere rather than H 2 /N 2 . The as-designed CaLuGaO 4 :Eu 2+ exhibits impressively appealing properties, i.e., intense red emission at 650 nm (λ ex = 450 nm), with high PLQY up to 86 % and good thermal stability in temperature range 10–500 K, marking it as a promising and formidable red phosphor in warm illumination. The excellent emission properties are theoretically revealed to associate with the closed-packed dimensional crystal structure with high Debye temperature equals 440 K, which reduces the non-radiative recombination loss. The investigations in electron-vibrational interaction in the Eu 2+ :5 d state disclosing the interaction is intermediate coupling regime with Huang-Rhys factor of 4.3. As a proof-of-concept experiment of the red phosphor for illumination, a prototype WLED possession of low CCT = 3917 K, high Ra = 92.2, and excellent luminous efficiency = 110 lm/W is constructed, and a portable rechargeable LED flashlight is assembled, by utilizing CaLuGaO 4 :Eu 2+ phosphor as a key red convector. Moreover, we have also demonstrated the phosphor synthesized under H 2 /N 2 can apply for latent fingerprint visualization.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
ACS Nano
·
2025
·
IF 16
Bing Qi,Wenjing Dai,Bibo Lou,Bin Song,Ziyun Miao,Yurong Wei,Chonggeng Ma,Jie Wang
Lanthanides are widely codoped in persistent luminescence phosphors (PLPs) to elevate defect concentration and enhance luminescence efficiency. However, the deleterious cross-relaxation between activators and lanthanides inevitably quenches persistent luminescence, particularly in heavily doped phosphors. Herein, we report a core–shell engineering strategy to minimize the unwanted cross-relaxation but retain the charge trapping capacity of heavily doped persistent luminescence phosphors by confining the activators and lanthanides in the core and shell, respectively. As a proof of concept, we prepared a series of codoped ZnGa2O4:Cr, Ln (CD-Ln, Ln = Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb) and core–shell structured ZnGa2O4:Cr@ZnGa2O4:Ln (CS-Ln) nanoparticles. First-principles investigations suggested that lanthanide doping elevated the electron trap concentration for enhancing persistent luminescence, but energy transfer (ET) from Cr3+ to Ln3+ ions quenched the persistent luminescence. The spatial separation of Cr3+ and Ln3+ ions in the core–shell structured CS-Ln nanoparticles suppressed the ET from Cr3+ to Ln3+. Due to the efficient suppression of deleterious ET, the optimal doping concentration of Ln in CS-Ln was elevated 50 times compared to CD-Ln. Moreover, the persistent luminescence intensity of CS-5%Ln was up to 60 times that of the original ZnGa2O4:Cr. The CS-5%Ln displayed significantly improved signal-to-noise ratios in bioimaging. Further, the CS-Ln was interfaced with the lycopene-producing bacteria Rhodopseudomonas palustris for solar-to-chemical synthesis, and the lycopene productivity was increased by 190%. This work provides a reliable solution to fulfill the potential of lanthanides in enhancing persistent luminescence and can further promote the applications of persistent luminescence phosphors in biomedicine and solar-to-chemical synthesis.
研究领域:
材料科学
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生物医学
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光化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yongsheng Sun,Xinquan Zhou,Zhenjie Lun,Kai Han,Puxian Xiong,Zhiguo Xia
Multi-mode luminescence tuning through in situ crystallization of topological glass holds significance for photonics applications. Here, NaAlSiO 4 :Eu 2+ -based glass ceramics are presented as stable persistent luminescence (PersL) materials by controlling the phase transformation in Eu 2+ doped Na 2 O-Al 2 O 3 -SiO 2 from amorphous glass to crystalline nepheline phase. X-ray and UV excited PersL colors from blue to yellow are realized by adjusting the crystallization duration time, and trap statuses reveal the dynamic PersL process with a trap redeployment from 0.83 to 1.09 eV during the transformation. Optical information storage model is constructed with a structure of stacked emitting layers to enhance storage capacity. X-ray excited luminescence time-lapse imaging is further demonstrated with optical memory longer than 5 days. These findings advance the development of superior stable PersL glass ceramics and offer optical manipulation tactics for multi-mode optical information storage applications.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 48
·19487-19497
·
IF 5.7
Dangli Gao,Chengxue Du,Yuqiang Wang,Wenqian Xu,Wenna Gao,Qing Pang,Yuhua Wang
The management of multicolour and multimode luminescence in persistent luminescence (PersL) materials plays a crucial role in encrypting information to combat forgery. Although luminescent anti-counterfeiting has made significant progresses, anti-counterfeiting signals only exhibit typical luminescent emission colours of materials under fixed external stimuli, which makes them susceptible to be replicated. Here, we developed a series of LiReGeO4:Bi,Ln (Re = Lu, Y and Gd, Ln = Eu, Tb, Pr, Yb, Sm, Tm, Ce, Dy and Er) phosphors with multicolour and on-demand controlled PersL emission through purposeful design of the electron–hole pair trap structure. Besides the multicolour and multimode emission, these phosphors demonstrated a temporal memory function for writing information, which provides a new dimension for higher-order anti-counterfeiting. As an example, LiLuGeO4:Bi,Ln (Ln = Eu, Tb, Pr and Yb) memory phosphors display the pattern signals in the order requested by the owner, which makes any sophisticated forgery technique powerless. The study here provides not only a simplistic method for constructing a new-type persistent memory material, but also a new paradigm of artificial intelligence memory for anti-counterfeiting technology.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）