JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
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2024
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IF 3.1
Qinyuan Qu,Wengang Liu,Wang Zheng,Benjamin Chetelat,Qingchuan Liu,Jiubin Chen
The geological and environmental applications of tin (Sn) isotopes have been hindered by the shortcomings of chemical purification, as severe loss of Sn would occur during sample preparation (evaporation and re-dissolution) and column separation, triggering isotope measurement bias. In this study, we develop a novel and robust separation method to purify Sn from natural samples for accurate isotope measurements. The protocol is established by combining two chromatographic columns loaded with AG 1-X8 and AG 50W-X12 resins, and optimizing the sample evaporation and re-dissolution procedures. The method is proven to efficiently eliminate the main interferents such as Ag, Zn, Mo, Cd and Sb and results in low procedural blank (0.54 ± 0.21 ng, n = 3), quantitative recovery (95–102%, n = 32) and good external precision (δ120Sn of 0.02–0.04‰, in 55 measurements) for isotope measurement. The protocol is further applied to seven geological and environmental reference materials (BCR-2, BHVO-2, AGV-2, JG-2, AC-E, PACs-2 and GSS 7) and new values are reported for both odd (δ119Sn and δ117Sn) and even (δ120Sn and δ122Sn) Sn isotope ratios. This study demonstrates clearly the potential application of our method for studying the geochemical behaviors of Sn and its isotopes in various aspects.
研究领域:
地球化学
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分析化学
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DOI
高影响因子
ChemSusChem
·
2019
·Vol. 12
·期 10
·2098-2116
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IF 7.804
Vaishakh Nair,Mario J. Muñoz-Batista,Marcos Fernández-García,Rafael Luque,Juan Carlos Colmenares
Graphical In the heat of the light : Thermo-photocatalysis is a new catalysis approach based on the synergistic mechanism of photo- and thermocatalysis that can operate under the emission of a solar spectrum (see image). The reaction mechanisms, reaction conditions involved in various thermo-photocatalysis-based reactions for different environmental and energy applications that have better efficiencies and desired characteristics compared to individual catalytic systems are reported. Catalysis is an integral part of a majority of chemical operations focused on the generation of value-added chemicals or fuels. Similarly, the extensive use of fossil-derived fuels and chemicals has led to deterioration of the environment. Catalysis currently plays a key role in mitigating such effects. Thermal catalysis and photocatalysis are two well-known catalytic approaches that were applied in both energy and environmental fields. Thermo-photocatalysis can be understood as a synergistic effect of the two catalytic processes with key importance in the use of solar energy as thermal and light source. This Review provides an update on relevant contributions about thermo-photocatalytic systems for environmental and energy applications. The reported activity data are compared with the conventional photocatalytic approach and the base of the photothermal effect is analyzed. Some of the systems based on the positive aspects of thermo- and photocatalysis could be the answer to the energy and environmental crisis when taking into account the outstanding results with regard to chemical efficiency and energy saving.
研究领域:
化学工程
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能源科学
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环境科学
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DOI
PubMed
高影响因子
BRAZILIAN JOURNAL OF PHYSICS
·
2003
·Vol. 33
·期 2
·231-237
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IF 0.678
Schwerer Otto
The Nuclear Data Section (NDS) of the International Atomic Energy Agency (IAEA) provides nuclear data services to scientists on a worldwide scale with particular emphasis on developing countries. More than 100 data libraries are made available cost-free by Internet, CD-ROM and other media. These databases are used for practically all areas of nuclear applications as well as basic research. An overview is given of the most important nuclear reaction and nuclear structure databases, such as EXFOR, CINDA, ENDF, NSR, ENSDF, NUDAT, and of selected special purpose libraries such as FENDL, RIPL, RNAL, the IAEA Photonuclear Data Library, and the IAEA charged-particle cross section database for medical radioisotope production. The NDS also coordinates two international nuclear data centre networks and is involved in data development activities (to create new or improve existing data libraries when the available data are inadequate) and in technology transfer to developing countries, e.g. through the installation and support of the mirror web site of the IAEA Nuclear Data Services at IPEN (operational since March 2000) and by organizing nuclear-data related workshops. By encouraging their participation in IAEA Co-ordinated Research Projects and also by compiling their experimental results in databases such as EXFOR, the NDS helps to make developing countries' contributions to nuclear science visible and conveniently available. The web address of the IAEA Nuclear Data Services is http://www-nds.iaea.org and the NDS mirror service at IPEN (Brasil) can be accessed at http://www-nds.ipen.br/
研究领域:
核物理学
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科学技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
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2023
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IF 5.2
Hui Zhang,Yazhou Wang,Yan Jiao,Si Chen,Meisong Liao,Yongzheng Fang,Weiqing Gao,Lili Hu
Fluorescent powders exhibiting excitation dependence and luminescent discoloration are profoundly relevant for concealing information and enhancing optical antiforgery protection. In this study, Bi 3+ /Ln 3+ (Eu 3+ , Er 3+ )-doped phosphors exhibiting multicolor luminescence and excitation wavelength dependence were synthesized. The Bi 3+ /Eu 3+ -codoped phosphors emitted blue, pink, lavender, and red lights under excitation from conventional ultraviolet (UV) sources. In addition to emitting blue light, the Bi 3+ /Er 3+ -codoped phosphors also transmitted upconversion-emission light from green to yellow under 980-nm laser excitation. Additionally, the luminous color of the Ca 3 Y 2 Ge 3 O 12 :0.01Bi 3+ , 0.2Er 3+ phosphor changed from yellow to orange as the temperature increased. Combining the above luminous-color-change phenomena, the word-hiding experiment exhibited excellent realistic information hiding, with complex color transformation in the stamen and petal parts of the flower pattern. Furthermore, rapid multimodal and complex discoloration was achieved using easy-to-obtain light sources, confirming the potential of Bi 3+ /Ln 3+ phosphors for anticounterfeiting applications.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
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2024
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IF 5.3
Wenkai Zhang,Chaoyong Deng,Min Zhang
Dy 3 + doped Gd 2 MgTiO 6 (GMT) phosphors were were fabricated using the high temperature solid state method in this study. Fluorescence, UV-visible spectrometer, X-ray photoelectron spectrometer, and Transient fluorescence spectrometer. The results show that the structures of the series of phosphors belong to the monoclinic crystal system, and Dy 3 + was successfully incorporated into the GMT host without affecting its structure. The samples emitted extremely strong blue and yellow light, which are the transitions derived from 4 H 9 / 2 to 6 H 15 / 2 (482 nm) and 6 H 13 / 2 (575 nm) levels, respectively. The sample shows obvious effects of concentration, GMT: 0.11Dy 3 + phosphor has the best photoluminescence (PL) intensity 7.148 × 10 5 , lifetime is 0.16 ms, and an internal quantum efficiency (IQE) is 2.1 % . The Dy 3 + doped sample has a larger energy band gap of 4.11 eV. The prepared samples exhibit color coordinates in proximity to that of standard white light, which indicates that the phosphor GMT: Dy 3 + can be applied to white light phosphors and light-emitting diode (LED) devices.
研究领域:
材料科学
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光学
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DOI
高影响因子
MICROCHIMICA ACTA
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2025
·Vol. 192
·期 4
·1-10
·
IF 5.3
Li Zhonghao,Wan Zherui,Cui Xiaoxu,Chen Qi,Hua Yue,Yang Guang
Polymer dots (PT-PDs) were obtained through a “synthesis-modification integration” method by using polyethyleneimine (PEI) and tartaric acid (TA) as raw materials. The designed PT-PDs displayed a nanoscale structure with an average size of 1.6 nm, and bright blue fluorescence (FL) emission with a fluorescence quantum yield (QY) of 14.3%. Moreover, the PT-PDs were used as a sensing platform for the sensitive and quantitative detection of tetracyclines (TCs) and Al 3+ via fluorescence quenching and recovery. The LODs for tetracycline hydrochloride (TCH), doxycycline (DOX), and Al 3+ were 94.8 nM, 76.7 nM, and 177.8 nM, respectively. In addition, PT-PDs incorporated with polyacrylamide were used for the recognition of TCs and Al 3+ in a portable manner on the basis of the fluorescence “ON–OFF-ON” strategy, which revealed great application in the field of anti-counterfeiting and encryption. Graphical
研究领域:
分析化学
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材料科学
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生物医学
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DOI
PubMed
高影响因子
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
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2015
·Vol. 81
·期 6
·
IF 3.668
Zhoukun Li,Jiale Wu,Biying Zhang,Fei Wang,Xianfeng Ye,Yan Huang,Qiang Huang,Zhongli Cui
A novel α-amylase, AmyM, was purified from the culture supernatant of Corallococcus sp. strain EGB. AmyM is a maltohexaose-forming exoamylase with an apparent molecular mass of 43 kDa. Based on the results of matrix-assisted laser desorption ionization–time of flight mass spectrometry and peptide mass fingerprinting of AmyM and by comparison to the genome sequence of Corallococcus coralloides DSM 2259, the AmyM gene was identified and cloned into Escherichia coli. amyM encodes a secretory amylase with a predicted signal peptide of 23 amino acid residues, which showed no significant identity with known and functionally verified amylases. amyM was expressed in E. coli BL21(DE3) cells with a hexahistidine tag. The signal peptide efficiently induced the secretion of mature AmyM in E. coli. Recombinant AmyM (rAmyM) was purified by Ni-nitrilotriacetic acid (NTA) affinity chromatography, with a specific activity of up to 14,000 U/mg. rAmyM was optimally active at 50°C in Tris-HCl buffer (50 mM; pH 7.0) and stable at temperatures of <50°C. rAmyM was stable over a wide range of pH values (from pH 5.0 to 10.0) and highly tolerant to high concentrations of salts, detergents, and various organic solvents. Its activity toward starch was independent of calcium ions. The Km and V max of recombinant AmyM for soluble starch were 6.61 mg ml−1 and 44,301.5 μmol min−1 mg−1, respectively. End product analysis showed that maltohexaose accounted for 59.4% of the maltooligosaccharides produced. These characteristics indicate that AmyM has great potential in industrial applications.
研究领域:
生物化学
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酶学
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微生物学
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DOI
PubMed
高影响因子
Advanced Optical Materials
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2024
·
IF 8
Yixuan Xu,Zihan Cheng,Henggang Wang,Jun Jiang,Zuxu Zhou,Linger Feng,Xiaomeng Wang,Hengwei Lin,Kai Jiang
Luminescent materials with time-resolved dynamic discoloring afterglow (TDDA) hold significant potential for applications in anti-counterfeiting and data encryption. However, the afterglows coming from organic systems are usually unidentifiable due to their shorter durations (less than 10 s). Achievement of long-lasting and visually discernible TDDA remains highly desirable but challenging. In this work, the TDDA duration is successfully extended from less than 10 s to minutes by engineering the luminescent centers of carbon dots (CDs) and introducing deep trap-states in a composite of CDs and carbon nitrides (CNs) (named Y-CDs@CN). It is confirmed that the regulation of luminescent centers in CDs containing both C═N and C═O bonds is responsible for the color changes during TDDA from yellow to green. Moreover, the generation of deep trap states is found to be significant for prolonging the afterglow duration to minutes level through converting room temperature phosphorescence into long persistent luminescence, thus making the entire dynamic discoloring process being easily recognized to naked eyes. Furthermore, the afterglow of Y-CDs@CN can also be excited by blue light and even using white light of a cell phone. To harness these characteristics, potential applications of Y-CDs@CN for portable anti-counterfeiting and multidimensional information encryption are primarily investigated.
研究领域:
材料科学
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光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhongfa Li,Wenjun Zhang,Chengyue Xin,Zihan Chen,Jian Sheng
Mn ions in different valence states can emit light of different colors in an octahedral coordination environment, which is conducive to the development of a single matrix with multi-color luminescence and applications in the field of anti-counterfeiting. The dual mode multi-color luminescent material CaSb 2 O 6 : Mn has been successfully synthesized using a single Mn source in the atmosphere. The CaSb 2 O 6 matrix itself can also absorb 285 nm UV light, emit blue light, and show a long afterglow phenomenon. Both Mn 4+ and Mn 2+ ions will appear in the [SbO 6 ] octahedra, whether the Mn source adopts MnCO 3 or MnO 2 . The Mn 4+ ion exhibits red emission upon UV excitation at 347 nm. The Mn 2+ ion can emit a bright green light at 285 nm excitation while exhibiting a long afterglow phenomenon. In this study, the Mn 2+ doped octahedron showed unique green emission and broadens the range of its photoluminescence (PL) wavelength. The performance of the material's long afterglow properties on the digital codes demonstrates its potential for dynamic anti-counterfeiting.
研究领域:
材料科学
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光学
·
无机化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Longfei Li,Yunguang Yin,Chenyu Mi,Youmei Wang,Yongshuai Xie,Luyi Zhu,Xinqiang Wang,Benxue Liu,Guanghui Zhang
In this paper, DyTaO 4 fiber membrane and fiber sponge were successfully prepared by electrospinning for the first time from new precursors of Dy and Ta. DyTaO 4 fibers were crystallized at only 430 °C from amorphous precursor fibers and without phase transformation up to 1600 °C. The fiber membranes have tensile strength (0.75 ± 0.20 MPa @ 800 °C) and flexibility, exhibits excellent flexural and compressive resilience properties, which can replace thermal insulation layer in firefighting suits and exhibit excellent thermal insulation properties and ablation resistance. The fiber sponge with the density of about 65 mg·cm −3 has low thermal conductivity of 23.5 and 86.4 mW·m −1 ·K −1 at room temperature and 1000 °C, respectively. Butane gun flame as heat source, the sample with the thickness of 25 mm can reduce the temperature from 1300 °C to 150 °C. After 600 s, the surface hardness of the fiber sponges was increased, but the sample still maintained excellent flexibility. This work provides a new way for rare-earth tantalates to meet high-temperature flexible applications by fully utilizing their advantages
研究领域:
材料科学
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热力学工程
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DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Qingming Wang,Shanshan Wu,Yingzi Tan,Yulin Yan,Lei Guo,Xinhui Tang
In present report, a new BDA for Cu 2+ has been disclosed for the first time. The presence of Cu 2+ caused an obvious fluorescence enhancement at 407 nm upon excitation at 360 nm, which could be distinguished by the naked eye under a UV lamp. It was found to have acceptable detection limits (0.12 μM), high selectivity and reversibility/reusability. The photoluminescence measurement indicates that BDA with Cu 2+ presence, showed very strong blue emission bands with CIE chromaticity coordinates (0.1652, 0.0723). Besides, the designed probe has shown potential applications in the area of sample monitoring, photo-printing.
研究领域:
分析化学
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材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Jiantao Lü,Ting Fan,Jie Liang,Yayun Zhou,Tingting Deng,Ruming Jiang
With the combination of carbon quantum dots (CDs) and rare earth-doped fluorescent materials, multi-mode luminescence can be achieved in fluorescent ink, thereby enhancing its anti-counterfeiting security coefficient. However, the self-quenching process in CDs currently hinders their application in the field of anti-counterfeiting. In this study, we employed simple chemical method to prepare the SiO 2 -encapsulated YVO 4 :Eu 3+ /CDs nanocomposites, which greatly improved the stability of the composite and achieved dual-mode solid-state luminescence. Quick response code anti-counterfeiting patterns were fabricated using screen printing technology, and dual-mode luminescence performance with red and blue emission was achieved under excitation at 254 nm and 365 nm respectively. The YVO 4 :Eu 3+ @SiO 2 @CDs nanocomposites showed stable dual-mode luminescent performance in both solid-state and solvent environment, demonstrating great potential in anticounterfeiting and information protection application.
研究领域:
材料科学
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光学
·
防伪技术
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DOI
高影响因子
危险品化学品经营许可证（带存储）