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38 results on '"Yin, Xuemiao"'

6. Stabilization of Plutonium(V) Within a Crown Ether Inclusion Complex

Author

Wang, Yaxing, primary, Hu, Shu-Xian, additional, Cheng, Liwei, additional, Liang, Chengyu, additional, Yin, Xuemiao, additional, Zhang, Hailong, additional, Li, Ao, additional, Sheng, Daopeng, additional, Diwu, Juan, additional, Wang, Xiaolin, additional, Li, Jun, additional, Chai, Zhifang, additional, and Wang, Shuao, additional

Published
2020
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9. Non-Drug Therapy to Combat Coronavirus

Author

Wang, Shouguo, primary, Liu, Wei, additional, Song, Yahui, additional, Xia, Tao, additional, Lu, Xianqin, additional, Song, Li, additional, Li, Qingwei, additional, Sun, Jian, additional, Yin, Xuemiao, additional, Feng, Xianqi, additional, Yang, Yunjun, additional, and Sun, Tao, additional

Published
2020
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12. Photo-exfoliation of a highly photo-responsive two-dimensional metal–organic framework

Author

Xie, Jian, primary, Wang, Yaxing, additional, Zhang, Duo, additional, Liang, Chengyu, additional, Liu, Wei, additional, Chong, Yu, additional, Yin, Xuemiao, additional, Zhang, Yugang, additional, Gui, Daxiang, additional, Chen, Lanhua, additional, Tong, Wei, additional, Liu, Zhiyong, additional, Diwu, Juan, additional, Chai, Zhifang, additional, and Wang, Shuao, additional

Published
2019
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14. Gleaming Uranium: An Emerging Emitter for Building X‐ray Scintillators.

Author

Wang, Yumin, Yin, Xuemiao, Chen, Junfeng, Wang, Yaxing, Chai, Zhifang, and Wang, Shuao

Subjects
*SCINTILLATORS, *URANIUM, *X-rays, *X-ray detection, *ATOMIC number, *LUMINESCENCE
Abstract

Scintillators are a unique class of luminescent materials with specific applications towards radiation detection. The emitters within state‐of‐the‐art scintillators are mostly limited to bismuth, cerium, europium, thallium, lead, tungsten, etc. A shared feature of these elements is the relatively high atomic number, which is responsible for high radiation stopping power and radiation‐induced luminescence. Searching for new scintillating materials is an essential target aiming at specific applications. In this Concept article, we will discuss our recent works on the topic of "uranyl‐bearing scintillators". As a virgin territory in this field, uranyl‐bearing scintillators show intrinsic merits for designing new materials with X‐ray detection capability, that is, the large photoelectric cross‐section, high X‐ray attenuation efficiency, and high crystal density. In addition, we also present challenges in the further development of the uranyl‐bearing scintillators. [ABSTRACT FROM AUTHOR]

Published
2020
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16. Innenrücktitelbild: Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X-ray Scintillators (Angew. Chem. 26/2018)

Author

Wang, Yaxing, primary, Yin, Xuemiao, additional, Liu, Wei, additional, Xie, Jian, additional, Chen, Junfeng, additional, Silver, Mark A., additional, Sheng, Daopeng, additional, Chen, Lanhua, additional, Diwu, Juan, additional, Liu, Ning, additional, Chai, Zhifang, additional, Albrecht-Schmitt, Thomas E., additional, and Wang, Shuao, additional

Published
2018
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17. Inside Back Cover: Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X-ray Scintillators (Angew. Chem. Int. Ed. 26/2018)

Author

Wang, Yaxing, primary, Yin, Xuemiao, additional, Liu, Wei, additional, Xie, Jian, additional, Chen, Junfeng, additional, Silver, Mark A., additional, Sheng, Daopeng, additional, Chen, Lanhua, additional, Diwu, Juan, additional, Liu, Ning, additional, Chai, Zhifang, additional, Albrecht-Schmitt, Thomas E., additional, and Wang, Shuao, additional

Published
2018
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19. Facile and Efficient Decontamination of Thorium from Rare Earths Based on Selective Selenite Crystallization

Author

Wang, Yaxing, primary, Lu, Huangjie, additional, Dai, Xing, additional, Duan, Tao, additional, Bai, Xiaojing, additional, Cai, Yawen, additional, Yin, Xuemiao, additional, Chen, Lanhua, additional, Diwu, Juan, additional, Du, Shiyu, additional, Zhou, Ruhong, additional, Chai, Zhifang, additional, Albrecht-Schmitt, Thomas E., additional, Liu, Ning, additional, and Wang, Shuao, additional

Published
2018
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23. Rare earth separations by selective borate crystallization

Author

Yin, Xuemiao, primary, Wang, Yaxing, additional, Bai, Xiaojing, additional, Wang, Yumin, additional, Chen, Lanhua, additional, Xiao, Chengliang, additional, Diwu, Juan, additional, Du, Shiyu, additional, Chai, Zhifang, additional, Albrecht-Schmitt, Thomas E., additional, and Wang, Shuao, additional

Published
2017
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24. Substitutional Disorder of SeO32–/IO3– in the Crystalline Solid Matrix: Insights into the Fate of Radionuclides 79Se and 129I in the Environment

Author

Wang, Yaxing, primary, Wang, Yumin, additional, Zhang, Linjuan, additional, Chen, Lanhua, additional, Liu, Zhiyong, additional, Yin, Xuemiao, additional, Sheng, Daopeng, additional, Diwu, Juan, additional, Wang, Jianqiang, additional, Liu, Ning, additional, Chai, Zhifang, additional, and Wang, Shuao, additional

Published
2017
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25. Competing Crystallization between Lanthanide and Actinide in Acidic Solution Leading to Their Efficient Separation.

Author

Yin, Xuemiao, Wang, Yaxing, Li, Xiaoyan, Xie, Jian, Silver, Mark A., Chen, Lanhua, Sheng, Daopeng, Ji, Guoxun, Chai, Zhifang, and Wang, Shuao

Subjects
*CRYSTALLIZATION, *RARE earth metals, *ACTINIDE elements, *EUROPIUM, *OXALIC acid
Abstract

Summary of main observation and conclusion: We present a new method for generating europium oxalate compounds by decomposing of N‐methyl 2‐pyrrolidone in HNO3 media. The reaction exhibits high selectivity towards Eu3+ over UO22+, which suggests that these conditions could be applied to a selective crystallization based separation system for trivalent lanthanides and hexavalent actinides. In this work, a new method for the separation of trivalent Eu3+ and hexavalent UO22+ in initial high‐acidity HNO3 solution is presented. N‐Methyl 2‐pyrrolidone was added in the HNO3 solution where Eu3+ and UO22+ coexisted, then the solution was heated. Eu3+ will react with oxalic acid and dimethylamine produced by N‐methyl 2‐pyrrolidone and form compound NH2(CH3)2[Eu(C2O4)2(H2O)], while UO22+ remains in the solution. This method provide a new strategy for separation of trivalent Eu3+ and hexavalent UO22+. [ABSTRACT FROM AUTHOR]

Published
2019
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26. Facile and Efficient Decontamination of Thorium from Rare Earths Based on Selective Selenite Crystallization

Author

Wang, Yaxing, Lu, Huangjie, Dai, Xing, Duan, Tao, Bai, Xiaojing, Cai, Yawen, Yin, Xuemiao, Chen, Lanhua, Diwu, Juan, Du, Shiyu, Zhou, Ruhong, Chai, Zhifang, Albrecht-Schmitt, Thomas E., Liu, Ning, and Wang, Shuao

Abstract

The coexistence of radioactive contaminants (e.g., thorium, uranium, and their daughters) in rare earth minerals introduces significant environmental, economic, and technological hurdles in modern rare earth production. Efficient, low cost, and green decontamination strategies are therefore desired to ameliorate this problem. We report here a single-step and quantitative decontamination strategy of thorium from rare earths based on a unique periodic trend in the formation of crystalline selenite compounds across the lanthanide series, where Ce(III) is fully oxidized in situ to Ce(IV). This gives rise to a crystallization system that is highly selective to trap tetravalent f-blocks while all other trivalent lanthanides completely remain in solution when coexist. These results are bolstered by first-principles calculations of lattice energies and an examination of bonding in these compounds. This system is contrasted with typical natural and synthetic systems, where trivalent and tetravalent f-block elements often cocrystallize. The separation factors after one round of crystallization were determined from binary systems of Th(IV)/La(III), Th(IV)/Eu(III), and Th(IV)/Yb(III) to reach 2.1 × 105, 1.2 × 105, and 9 × 104, respectively. Selective crystallization of thorium from a simulated monazite composite yields a separation factor of 1.9 × 103with nearly quantitative removal of thorium.

Published
2024
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27. Mild Periodic Acid Flux and Hydrothermal Methods for the Synthesis of Crystalline f-Element-Bearing Iodate Compounds

Author

Wang, Yaxing, Duan, Tao, Weng, Zhehui, Ling, Jie, Yin, Xuemiao, Chen, Lanhua, Sheng, Daopeng, Diwu, Juan, Chai, Zhifang, Liu, Ning, and Wang, Shuao

Abstract

f-element-bearing iodate compounds are a large family mostly synthesized by hydrothermal reactions starting with actinide/lanthanide ions and iodic acid or iodate salt. In this work, we introduce melting periodic acid flux as a new reaction medium and provide a safe way for single-crystal growth of a series of new f-element iodate compounds including UO2(IO3)2·H2O (1), UO2(IO3)2(H2O)·HIO3(2), α-Th(IO3)2(NO3)(OH) (3), β-Th(IO3)2(NO3)(OH) (4), and (H3O)9Nd9(IO3)36·3HIO3(5). The structures of these compounds deviate from those afforded from hydrothermal reactions. Specifically, compounds 1and 2exhibit pillared structures consisting of uranyl pentagonal bipyramids and iodate trigonal pyramids. Compounds 3and 4represent two new thorium iodate compounds that are constructed from subunits of thorium dimers. Compound 5exhibits a flower-shaped trivalent lanthanide iodate structure with HIO3molecules and H3O+cations filled in the channels. The aliovalent replacement of f elements in 5is available from a hydrothermal process, further generating compounds of Th2(IO3)8(H2O) (6) and Ce2(IO3)8(H2O) (7). The distinct absorption features are observed in isotypic compounds 5–7, where 7shows typical semiconductor behavior with a band gap of 2.43 eV. Remarkably, noncentrosymmetric 1, 6, and 7exhibit strong second-harmonic-generation efficiencies of 1.3, 3.2, and 9.2 times, respectively, that of the commercial material KH2PO4. Additionally, the temperature-dependent emission spectra of 1and 2were also collected showing typical emission features of uranyl units and a negative correlation between the intensities of the emissions with temperature. Clearly, the presented low-temperature melting inorganic acid flux synthesis would provide a facile and effective strategy to produce a large new family of structurally versatile and multifunctional f-element inorganic compounds.

Published
2024
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30. Emergence of Uranium as a Distinct Metal Center for Building Intrinsic X‐ray Scintillators.

Author

Yin, Xuemiao, Liu, Wei, Xie, Jian, Silver, Mark A., Sheng, Daopeng, Chen, Lanhua, Diwu, Juan, Chai, Zhifang, Wang, Shuao, Wang, Yaxing, Liu, Ning, Chen, Junfeng, and Albrecht‐Schmitt, Thomas E.

Subjects
*CRYSTAL structure, *URANIUM, *THERMOGRAVIMETRY, *SCINTILLATORS, *FOURIER transform infrared spectroscopy
Abstract

Abstract: The combination of high atomic number and high oxidation state in UVI materials gives rise to both high X‐ray attenuation efficiency and intense green luminescence originating from ligand‐to‐metal charge transfer. These two features suggest that UVI materials might act as superior X‐ray scintillators, but this postulate has remained substantially untested. Now the first observation of intense X‐ray scintillation in a uranyl–organic framework (SCU‐9) that is observable by the naked eye is reported. Combining the advantage in minimizing the non‐radiative relaxation during the X‐ray excitation process over those of inorganic salts of uranium, SCU‐9 exhibits a very efficient X‐ray to green light luminescence conversion. The luminescence intensity shows an essentially linear correlation with the received X‐ray intensity, and is comparable with that of commercially available CsI:Tl. SCU‐9 possesses an improved X‐ray attenuation efficiency (E>20 keV) as well as enhanced radiation resistance and decreased hygroscopy compared to CsI:Tl. [ABSTRACT FROM AUTHOR]

Published
2018
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36. Emergence of a Radical-Stabilizing Metal-Organic Framework as a Radio-photoluminescence Dosimeter.

Author

Liu H, Qin H, Shen N, Yan S, Wang Y, Yin X, Chen X, Zhang C, Dai X, Zhou R, Ouyang X, Chai Z, and Wang S

Abstract

Radio-photoluminescence (RPL) materials display a distinct radiation-induced permanent luminescence center, and therefore find application in the detection of ionizing radiation. The current inventory of RPL materials, which were discovered by serendipity, has been limited to a small number of metal-ion-doped inorganic materials. Here we document the RPL of a metal-organic framework (MOF) for the first time: X-ray induced free radicals are accumulated on the organic linker and are subsequently stabilized in the conjugated fragment in the structure, while the metal center acts as the X-ray attenuator. These radicals afford new emission features in both UV-excited and X-ray excited luminescence spectra, making it possible to establish linear relationships between the radiation dose and the normalized intensity of the new emission feature. The MOF-based RPL materials exhibit advantages in terms of the dose detection range, reusability, emission stability, and energy threshold. Based on a comprehensive electronic structure and energy diagram study, the rational design and a substantial expansion of candidate RPL materials can be anticipated., (© 2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2020
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37. Substitutional Disorder of SeO 3 2- /IO 3 - in the Crystalline Solid Matrix: Insights into the Fate of Radionuclides 79 Se and 129 I in the Environment.

Author

Wang Y, Wang Y, Zhang L, Chen L, Liu Z, Yin X, Sheng D, Diwu J, Wang J, Liu N, Chai Z, and Wang S

Abstract

As the crucial soluble species of long-lived radionuclides 129 I and 79 Se, iodate and selenite anions commonly share similar geometry of the trigonal pyramid XO 3 (X = I, Se) but in different valence states. Although large amounts of investigations have been performed aiming at understanding the environmental behavior of these two anions individually, studies on cases when they coexist are extremely scarce. Structurally well-characterized natural/synthetic crystalline solids simultaneously incorporating these two anions as potential solubility-limiting products at the nuclear waste geological depository remain elusive. We report here a crystalline solid Th(IO 3 ) 2 (SeO 3 ) representing the first example of aliovalent substitution between IO 3 - and SeO 3 2- sharing the same structural site, as demonstrated by single crystal X-ray diffraction, laser-ablation inductively coupled plasma mass spectrometry analysis, and spectroscopic techniques including infrared, Raman, and X-ray absorption spectroscopies. Sequentially, in the Eu(IO 3 ) 3 solid matrix, we demonstrated that the IO 3 - site can be sufficiently substituted by SeO 3 2- in the presence of Th 4+ via simultaneous incorporation of Th 4+ and SeO 3 2- in a charge-balancing mechanism. The obtained results provide insights into the environmental behavior of fission products 79 Se and 129 I: they may cocrystallize in one solid matrix and may be efficiently immobilized by incorporation into each other's solid phase through solid solution.

Published
2017
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38. Boosting Proton Conductivity in Highly Robust 3D Inorganic Cationic Extended Frameworks through Ion Exchange with Dihydrogen Phosphate Anions.

Author

Xiao C, Wang Y, Chen L, Yin X, Shu J, Sheng D, Chai Z, Albrecht-Schmitt TE, and Wang S

Abstract

The limited long-term hydrolytic stability of rapidly emerging 3D-extended framework materials (MOFs, COFs, MOPs, etc.) is still one of major barriers for their practical applications as new solid-state electrolytes in fuel cells. To obtain hydrolytically stable materials, two H2 PO4 (-) -exchanged 3D inorganic cationic extended frameworks (CEFs) were successfully prepared by a facile anion-exchange method. Both anion-exchanged CEFs (YbO(OH)P and NDTBP) show significantly enhanced proton conductivity when compared with the original materials (YbO(OH)Cl and NDTB) with an increase of up to four orders-of-magnitude, reaching 2.36×10(-3) and 1.96×10(-2)  S cm(-1) at 98 % RH and 85 °C for YbO(OH)P and NDTBP, respectively. These values are comparable to the most efficient proton-conducting MOFs. In addition, these two anion-exchanged materials are stable in boiling water, which originates from the strong electrostatic interaction between the H2 PO4 (-) anion and the cationic host framework, showing a clear advance over all the acid-impregnated materials (H2 SO4 @MIL-101, H3 PO4 @MIL-101, and H3 PO4 @Tp-Azo) as practical solid-state fuel-cell electrolytes. This work offers a new general and efficient approach to functionalize 3D-extended frameworks through an anion-exchange process and achieves water-stability with ultra-high proton conductivity above 10(-2)  S cm(-1) ., (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)

Published
2015
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