PHYSICS AND CHEMISTRY OF MINERALS
·
2025
·Vol. 52
·期 3
·1-10
·
IF 1.6
Wang Kai,Xu Jingui,Zhang Shanrong,Zhong Qifa,Zhao Wei,Fan Dawei
The equation of state of ilmenite (FeTiO 3 ) and geikielite (MgTiO 3 ) have been investigated using in situ synchrotron X-ray diffraction at high pressures up to ~ 21.8 GPa and ~ 23.0 GPa, respectively. No phase transitions were observed within the experimental pressure ranges for both samples. The pressure-volume data were fitted using the third-order Birch-Murnaghan equation of state (EoS), yielding the following results: for FeTiO 3 , the zero-pressure unit-cell volume V 0 = 312.2(1) Å 3 , the zero-pressure bulk modulus K 0 = 165(4) GPa, and its pressure derivative K ′ 0 = 6.6(6); for MgTiO 3 , V 0 = 304.17(8) Å 3 , K 0 = 157(3) GPa, and K ′ 0 = 7.3(4). Additionally, the axial compressional behavior of FeTiO 3 and MgTiO 3 were also fitted with a linearized third-order Birch-Murnaghan EoS. The axial compressibility coefficients for FeTiO 3 along the a- and c- axes are β a = 1.43(4) × 10 − 3 GPa -1 and β c = 3.17(11) × 10 − 3 GPa -1 , respectively, with an anisotropic ratio of β a : β c = 0.45: 1.00, while β a = 1.76 (7) × 10 − 3 GPa -1 and β c = 2.61(7) × 10 − 3 GPa -1 with an anisotropic ratio of β a : β c = 0.67: 1.00 for MgTiO 3 . Both FeTiO 3 and MgTiO 3 exhibit the axial compression anisotropy, of which FeTiO 3 shows stronger axial compressibility anisotropy than MgTiO 3 . Moreover, the potential influencing factors (e.g., cation radius, crystal structure, and chemical bond strength) on the bulk moduli and the anisotropic linear compressibilities of FeTiO 3 and MgTiO 3 were further discussed.
研究领域:
地球科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
·
2014
·
IF 2.227
Y.Y. Wang,X. Kang,Y.W. Liu,W.Q. Xu,L. Wang,C.Z. Hu,J. Chen,F.Y. Liu,L.S. Sheng,X.L. Zhao,P.F. Zhang,L.F. Zhu
Using vacuum ultraviolet photons produced by synchrotron radiation and reflection time-of-flight mass spectrometer, dissociative photoionization of isooctane was measured in the photon energy region of 9.7–15.6 eV under ultrasonic molecular beam. Then the dissociative ionization products at different photon energies were obtained. By measuring the photoionization efficiency curves, the appearance potentials of the dominative ion fragments and the vertical ionization energy of isooctane were determined. In addition, combining with G3 calculations we obtained the structure and energy of the parent, neutral and ion fragments. By comparing the experimental measurements with the theoretical calculations, the dissociative photoionization channels of isooctane were elucidated, and formation enthalpies of the fragmented ions and the dissociation energy of the parent ion were obtained.
研究领域:
化学物理
·
分子光谱学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2018
·Vol. 8
·期 1
·1-14
·
IF 4.122
Huang Wenli,Jiao Jie,Ru Mei,Bai Zhenqing,Yuan Honglin,Bao Zhian,Liang Zongsuo
Coptis chinensis Franch. is one of the most important medicinal plants globally. However, this species contains relatively high concentrations of chromium (Cr) which potentially detrimental to human health. It is important to understand Cr localization and speciation in order to evaluate its accumulation and transportation mechanisms and minimize Cr transfer to humans. As little previous work in this area has been carried out, we utilized synchrotron radiation microscopic X-ray fluorescence (SR-μXRF) and laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to spatially locate Cr, X-ray absorption near-edge spectroscopy (XANES) to analyze Cr speciation, and inductively coupled plasma mass spectrometry (ICP-MS) to detect Cr subcellular concentration. Micromapping results showed that Cr was distributed predominantly within the vascular cylinder, the periderm and some outer cortex, and the cortex and some vascular bundles in root, rhizome, and petiole, respectively. XANES data showed that Cr(VI) can be reduced to Cr(III) when grown with Cr(VI), and yielded a novel conclusion that this plant contain elemental chromium. ICP-MS data showed that Cr was primarily compartmentalized in cell walls in all tissues. The new insights on Cr accumulation in C. chinensis Franch. provide a theoretical basis for the evaluation of Cr in other medicinal plants.
研究领域:
植物学
·
环境科学
·
药用植物研究
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
·
2011
·
IF 2.009
Mingfeng Xie,Zhongyue Zhou,Zhandong Wang,Dongna Chen,Fei Qi
The absolute photoionization cross-sections of 24 nitrogenous compounds were measured in the photon energy range from their respective ionization thresholds to 11.5 eV, including n -propylamine, iso -propylamine, n -butylamine, 2-butylamine, iso -butylamine, tert -butylamine, diethylamine, dibutylamine, triethylamine, aniline, benzylamine, n -methylaniline, cyclohexanamine, nitromethane, nitroethane, nitropropane, nitrobenzene, pyrrole, pyridine, pyrrolidine, morpholine, N , N -dimethylethanolamine, benzonitrile and benzeneacetonitrile. The experiments were performed by photoionization mass spectrometry with tunable synchrotron vacuum ultraviolet (VUV) light as an ionization source. Binary-liquid-mixtures of investigated and standard species were used in this measurement. As a good solvent, benzene was chosen as a calibration standard, since its photoionization cross-section had been well know. Moreover, photodissociative fragments were also presented.
研究领域:
化学
·
物理学
✓ 已验证
DOI
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2013
·
IF 2.56
Liangyuan Jia,Jiuzhong Yang,Lidong Zhang,Feng Zhang,Fei Qi,Haiyan Fan,Jibao Cai
Rhubarb has been used as a tobacco additive recently. In order to understand the smoke emissions of herbal cigarettes with rhubarb additive, the pyrolysis of major components of rhubarb: chrysophanol and its derivatives (emodin, rhein and aloe-emodin) have been studied by synchrotron VUV photoionization mass spectrometry (SVUV-PIMS) combined with molecular-beam sampling technique. Various pyrolysis products are observed due to the different substituent groups. The main pyrolysis products of chrysophanol come from the CO and H 2 O elimination reactions. The CO, CO 2 and HCOOH elimination reactions are the primary pyrolysis processes for rhein. Besides, elimination of H 2 from aloe-emodin and loss of OH radical from both emodin and rhein also occur in the pyrolysis process. Furthermore, theoretical calculations are used to deduce the decomposition pathways and determine the geometries of pyrolysis products. Our work shows that the combination of SVUV-PIMS measurements and theoretical calculations is powerful to study pyrolysis behavior of complex organic compounds.
研究领域:
化学
·
烟草科学
·
环境科学
✓ 已验证
DOI
高影响因子
Catalysts
·
2021
·Vol. 11
·期 9
·1079
·
IF 4.146
Song Zhou,Xi Liu,Jian Xu,Hui Zhang,Xiaosong Liu,Pengcheng Li,Xiaodong Wen,Yong Yang,Yongwang Li
As an alternative to noble metal hydrogenation catalysts, pure molybdenum carbide displays unsatisfactory catalytic activity for arene hydrogenation. Precious metals such as palladium, platinum, and gold are widely used as additives to enhance the catalytic activities of molybdenum carbide, which severely limits its potential applications in industry. In this paper, iron-promoted molybdenum carbide was prepared and characterized by various techniques, including in situ XRD, synchrotron-based XPS and TEM. while the influence of Fe addition on catalytic performance for toluene hydrogenation was also studied. The experimental data disclose that a small amount of Fe doping strongly enhances catalytic stability in toluene hydrogenation, but the catalytic performance drops rapidly with higher loading amounts of Fe.Keywords:molybdenum carbide;Fe-promoter;toluene hydrogenation;synchrotron-based XPS;in situ XRD
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2022
·Vol. 36
·期 23
·e9412
·
IF 2.586
Haifeng Zhuang,Lin Chen,Qiang Xu,Bingzhi Liu,Peiqi Liu,Zhandong Wang,Liangyuan Jia
Rationale Biomass is a potential feedstock for making liquid fuels and valuable chemicals. Quantitative analysis of biomass conversion in real time by photoionization mass spectrometry (PIMS) is an important way to understand the reaction process. However, the lack of photoionization data for biomass-derived compounds limits the research using PIMS. Methods Measurements of photoionization data were performed with synchrotron vacuum ultraviolet PIMS. Toluene and methanol were used as calibrated references and solvents in this experiment since their photoionization cross-sections (PICS) are well documented in the literature. Results The ionization energies (IEs) of 23 biomass-derived compounds were measured. Among them, the PICSs of 14 compounds were calibrated and presented. Besides, the IEs of 95 other biomass-derived compounds and their typical fragment ions were also summarized. Conclusions A photoionization database related to IEs and PICSs of biomass-derived compounds ( m / z < 200) is established. PICSs of most biomass-derived compounds have low values at the most frequently used photoionization energy of 10.5 eV. Lignin-derived compounds have lower IEs than carbohydrate-derived compounds.
研究领域:
能源科学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2009
·Vol. 23
·期 24
·3994-4002
·
IF 2.772
Zhongyue Zhou,Mingfeng Xie,Zhandong Wang,Fei Qi
The absolute photoionization cross-sections of aromatics and aromatic derivatives including toluene, ethylbenzene, n -propylbenzene, o -xylene, m -xylene, p -xylene, 1,3,5-trimethylbenzene, styrene, phenylacetylene, indene, indane, 1-methylnaphthalene, benzyl alcohol and benzaldehyde were measured at the photon energy range from ionization thresholds to 11.7 eV. The experiments were performed by tunable synchrotron vacuum ultraviolet (VUV) photoionization mass spectrometry. Benzene was chosen as a calibration standard, since its photoionization cross-section is well known. Binary liquid mixtures of the investigated molecules and benzene were used in the measurements. Photo-induced fragments from the molecules were also observed, and their photoionization cross-sections are also presented. Copyright © 2009 John Wiley & Sons, Ltd.
研究领域:
化学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL PHYSICS
·
2016
·Vol. 29
·期 5
·533-538
·
IF 0.496
Wang Yang-yang,Liu Ya-wei,Kang Xu,Zhao Xiao-li,Wang Lin,Hu Chuo-zhao,Liu Fu-yi,Sheng Liu-si,Zhu Lin-fan
Dissociative photoionization of 1,2-epoxyoctane was investigated by synchrotron radiation vacuum ultraviolet photons in the energy region of 9.8–16.6 eV under ultrasonic molecular beam. Dissociative fragment ions were measured with reflection time-of-flight mass spectrometer at different photon energies. Appearance potentials of the dominative ion fragments were determined through photoionization efficiency curves. The structures and energies of the parent, ionized and neutral radicals were obtained with G3 calculations. Through comparing the experimental results with the theoretical calculations, we proposed the dissociative channels for the photoionization of 1,2-epoxyoctane.
研究领域:
物理化学
·
分子光谱学
✓ 已验证
DOI
高影响因子
FITOTERAPIA
·
2019
·
IF 2.431
Kan Li,Da-Song Yang,Xiao-Fei Gu,Bin Di
The determination of the absolute configuration of natural products still faces many challenges, especially the active pharmaceutical ingredient which is trace, oily and novel structures. Currently, NMR requires chiral reagents in determining the absolute configuration; ECD involves theoretical calculations and requires chromophores. In this study, the absolute configuration of asarinin had successfully identified by using synchrotron radiation with crystalline sponge method and combining MS with NMR. This method could identifying the crystal structure of trace amorphous substances, resolving the problem of absolute configuration of multi-chiral central compounds, and hopefully providing a new idea and approach for structural elucidation of natural products.
研究领域:
药物化学
·
结构生物学
✓ 已验证
DOI
高影响因子
Nuclear Science and Techniques
·
2025
·Vol. 36
·期 5
·1-13
·
IF 3.8
Dai Zhong-Qin,Chen Huan,Wen Zhao-Yin
Lithium- and manganese-rich (LMR) oxide cathode materials are among the most attractive candidates for next-generation energy-storage materials owing to their anomalous capacity. However, severe Mn dissolution that occurs during long-term cycling, which leads to capacity loss, hinders their application prospects. In this study, nanoscale \(\textrm{AlPO}_{4}\) -coated \(\textrm{Li}_{1.2}\textrm{Ni}_{0.13}\textrm{Co}_{0.13}\textrm{Mn}_{0.54}\textrm{O}_{2}\) (LMR@APO) with significantly enhanced electrochemical performance is successfully synthesized using a simple and effective sol–gel method to mitigate Mn dissolution and suppress local structural distortion at high voltages. Because of the complex evolution of the structure and oxidation state of LMR materials during electrochemical cycling, observing and analyzing them using traditional single characterization methods may be difficult. Therefore, we combine various synchrotron-based characterization techniques to conduct a detailed analysis of the electronic and coordination structures of the cathode material from the surface to the bulk. Synchrotron-based hard and soft X-ray spectroscopies are integrated to investigate the differences in O and Mn evolution between the surfaces and bulk of the cathode. Advanced synchrotron-based transmission X-ray microscopy combined with X-ray near-edge absorption-structure technology is utilized to visualize the two-dimensional nanometer-scale reactivity of the LMR cathode. The \(\textrm{AlPO}_{4}\) -coating layer can stabilize the surface structure of the LMR material, effectively alleviating irreversible oxygen release on the surface and preventing the dissolution of \(\textrm{Mn}^{2+}\) at the interface caused by side reactions after a long cycle. Therefore, the spatial reaction uniformity of Mn is enhanced by the \(\textrm{AlPO}_{4}\) -coating layer, and rapid capacity decay caused by Mn deactivation is prevented. The \(\textrm{AlPO}_{4}\) -coating method is a facile modification strategy for high-performance LMR materials.
研究领域:
材料科学
·
能源存储技术
·
表面科学
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2017
·Vol. 7
·期 1
·1-10
·
IF 4.259
Feng Shanglei,Yang Yingguo,Li Li,Zhang Dongsheng,Yang Xinmei,Xia Huihao,Yan Long,Tsang Derek K. L.,Huai Ping,Zhou Xingtai
An in-situ real-time synchrotron-based grazing incidence X-ray diffraction was systematically used to investigate the crystal structural evolution of carbon fiber reinforced carbon matrix (C/C) composite impregnated with FLiNaK molten salt during the heat-treatment process. It was found that the crystallographic thermal expansion and contraction rate of interlayer spacing d
002 in C/C composite with FLiNaK salt impregnation is smaller than that in the virgin sample, indicating the suppression on interlayer spacing from FLiNaK salt impregnated. Meanwhile the crystallite size L
C002 of C/C composite with FLiNaK salt impregnation is larger than the virgin one after whole heat treatment process, indicating that FLiNaK salt impregnation could facilitate the crystallization of C/C composite after heat treatment process. This improved crystallization in C/C composite with FLiNaK salt impregnation suggests the synthetic action of the salt squeeze effect on crooked carbon layer and the release of internal residual stress after heating-cooling process. Thus, the present study not only contribute to reveal the interaction mechanism between C/C composite and FLiNaK salt in high temperature environment, but also promote the design of safer and more reliable C/C composite materials for the next generation molten salt reactor.
研究领域:
材料科学
·
核能工程
·
晶体学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）