JOURNAL OF PHARMACEUTICAL SCIENCES
·
2024
·
IF 3.7
Yuanfeng Wei,Xin Chen,Runxue Ding,Jingwen Zhang,Hui Chen,Junxiao Zhu,Jianjun Zhang,Peiya Shen
Different from salt, metal chelate is a novel state of drug constructed by more separate coordinate bonds to form a chelating circle. Due to their composition similarity, it is hard to distinguish them except identifying ionic bond (i.e., salt) or coordinate bond (i.e., chelate) in the single crystal structure. In this study, sodium chelate (CDCC No: 1865670) and lithium salt (CDCC No: 2161617) of puerarin (PUE) was prepared. In addition to difference in single crystal structure, it was found that they showed totally different phase solubility behaviors: lithium salt demonstrated a typical inverse proportion curve as other common salts, while sodium chelate exhibited disordered scatters. However, when incorporating the unit PUE-Na complex in solution state and complexation constant K 11 in chemical equation, the scatters in phase solubility diagram of chelate could be well fitted and the value of K 11 was dramatically higher with orders of magnitude than the dissociation constant K c ; while processing phase solubility curve of lithium salt by incorporating complex item, it could not well match the curve at all. PUE sodium chelate is more likely to be a weak electrolyte with partial dissociation, while PUE lithium salt acted as a strong electrolyte with complete dissociation. The phase solubility test would be served as a surrogate tool for differentiation of chelates from salts when single crystal was not available.
研究领域:
药学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE PHYSICS LETTERS
·
2017
·Vol. 34
·期 6
·068103
·
IF 0.8
Wen-Rong Xie,Bin Liu,Tao Tao,Guo-Gang Zhang,Bao-Hua Zhang,Zi-Li Xie,Peng Chen,Dun-Jun Chen,Rong Zhang
A sequential deposition method is developed, where the hybrid organic–inorganic halide perovskite (CH3NH3Pb (I1−xBrx)3) is synthesized using precursor solutions containing CH3NH3I and PbBr2 with different mole ratios and reaction times. The perovskite achieved here is quite stable in the atmosphere for a relatively long time without noticeable degradation, and the perovskite nanowires are proved to be single crystalline structure, based on transmission electron microscopy. Furthermore, strong red photoluminescence from perovskite is observed in the wavelength range from 746 nm to 770 nm with the increase of the reaction time, on account of the exchanges between I− ions and Br− ions in the perovskite crystal. Lastly, the influences of concentration and reaction time of the precursor solutions are discussed, which are important for evolution of hybrid perovskite from nanocuboid to nanowire and nanosheet.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Qi Liu,Zhenqian Wu,Jingying Sun,Ruimei Xu,Xianwei Li,Xiao Yu,Yong Liu
Co-free, Ni-rich cathode materials have aroused enormous attentions for the low cost, sustainable development of lithium-ion batteries. However, it is not easy to fabricate single-crystalline Ni-rich cathode materials from the hierarchical structured precursors via coprecipitation method. Furthermore, it is difficult to introduce Al dopant during the coprecipitation process to obtain high quality Ni-rich cathode material owing to the rapid sediment of Al 3+ . Herein, we developed a one-step stirring-assisted cation chelation and reassembly route for fabricating crack-free single-crystalline, Al-doped Co-free Ni-rich cathode material. The fabricated LiNi 0.8 Mn 0.16 Al 0.04 O 2 shows a high capacity of 204 mAh g −1 at 0.1C, excellent rate capability (143 mAh g −1 at 10C), and good cycling stability (an initial specific capacity of 178 mAh g −1 with capacity retention of 82.2% at 1C over 200 cycles). Furthermore, when tested at a raised temperature of 55 °C, it exhibited an initial capacity of 194.7 mAh g −1 with capacity retention of 82.1% at 1C over 100 cycles. The outstanding electrochemical performance can be ascribed to the synergistic effect of single crystalline structure and successful doping of Al element in the cathode, which enable fast ion and electron transport , suppress Li/Ni mixing and maintain the structural stability.
研究领域:
材料科学
·
电化学
·
能源存储技术
✓ 已验证
DOI
高影响因子
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Liu Yanjuan,Liu Xiaowei,Zhan Yongjie,Fan Haiming,Lu Yang
Recently helical nanostructures such as nanosprings and nanocoils have drawn great interests in nanotechnology, due to their unique morphologies and physical properties and they may be potential building blocks in sorts of electromechanical, magnetic, photoelectronic and plasmonic devices at micro/nanoscales. In this report, multi-turns copper nanocoils were synthesized through a modified solvothermal method, in which the mixture of water and N-methyl-2-pyrrolidone (NMP) were selected as reaction medium and copolymer poly(1-vinylpyrrolidone-co-vinyl acetate) (PVP/VA 64E) as reductant. In the liquid solution, nanosprings could be formed from relaxed nanocoils and demonstrated high elasticity. These nanocoils and nanosprings are of single crystalline structure, with the characteristics wire diameters ranging from tens to a few hundreds of nanometers and the ring/coil diameters mostly ~10–35 microns. Their growth and deformation mechanisms were then investigated and discussed along with that of previously reported single-turn copper nanorings. This work could be of importance for researchers working on synthesis and applications of novel 1-D helical nanomaterials and their functional devices.
研究领域:
纳米技术
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-7
·
IF 15.7
Yao Aiping,Xu Hongliang,Shao Kuizhan,Sun Chunyi,Qin Chao,Wang Xinlong,Su Zhongmin
Soft porous crystals, recognized as the third generation of smart porous materials, can undergo structural deformations in response to external stimuli, such as temperature, pressure, and guest molecules. Currently, the dynamic phase transformations of soft porous crystals are predominantly determined through quantitative modeling based on gas adsorption and powder X-ray diffraction. Herein, we investigate the single-crystal-to-single-crystal structural transformation of covalent organic soft porous crystal modeled on COF-300 and identified nine distinct conformational isomers induced by different guest molecules at room and high temperatures. Notably, COF-300 can maintain its single-crystal structure even at 280 °C and efficiently absorbs polycyclic aromatic hydrocarbons in their molten state. The kinetics of structural transformations among conformational isomers are investigated by combining PXRD and theoretical calculations. The structural transformation from a high-energy state to a low-energy state is a rapid, energetically favorable process, while the reverse transformation is a slow process driven by concentration gradients.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Dan Zhao,Wen Liu,Ya-Nan Li,Rui-Juan Zhang,Li-Na Zhang
A modulated structure with symmetrical characteristic higher than three-dimensional is a fascinating crystallographic type, and it is randomly encountered by researchers. Herein, we prepared 0.1 mm level single crystals of Na3La(VO4)2 and determined its structure to be a (3 + 1)-dimensional modulated structure using the X-ray diffraction analysis method for single crystals. Its super space group was determined to be Pca21(0β0)000. On the other hand, we introduced Tb3+ into the Na3La(VO4)2 host lattice to fabricate phosphors Na3La1-x(VO4)2:xTb3+ and studied their photoluminescence properties. Interestingly, for the strong absorption of the Na3La(VO4)2 host lattice in the range of 200–400 nm, the traditional 330–385 nm light is unable to efficiently excite Tb3+ ions in the Na3La(VO4)2 host to generate luminescence of Tb3+. Instead, Na3La1–x(VO4)2:xTb3+ is suitable to be excited by 487 nm to generate emitting light at 543, 584, and 622 nm, due to Tb3+ characteristic 4f → 4f transitions of 5D4 → 7FJ (J = 5, 4, 3). Hence, the Tb3+-doped Na3La(VO4)2 phosphors have potential applications for white-light-emitting diodes.
研究领域:
材料科学
·
晶体学
·
光学
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产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE-POLAND
·
2013
·Vol. 31
·期 2
·186-192
·
IF 0.258
Pei L. Z.,Xie Y. K.,Pei Y. Q.,Yuan C. Z.
Crystalline zirconium dioxide nanorods have been prepared by a simple hydrothermal process using zirconium hydroxide as the zirconium raw material. Zirconium dioxide nanorods are composed of monoclinic zirconium dioxide phase, which has been confirmed by the X-ray diffraction analysis. Electron microscopy observations show that the zirconium dioxide nanorods have a single crystal structure, with the rod diameter of less than 100 nm and length of 1–2 μm. Hydrothermal temperature and reaction time play essential roles in the formation and growth of the zirconium dioxide nanorods. Nucleation and crystal growth process are proposed to explain the formation and growth of the zirconium dioxide nanorods.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Wenbin Li,Jianfeng Huang,Liangliang Feng,Liyun Cao,Yijun Liu,Limin Pan
Crystallinity structure plays a key role in the rate capability and cycling performance for rechargeable battery. However, the effect of crystallinity structure on sodium storage properties of VS 2 hasn't been clearly elucidated. In this work, VS 2 nanoarchitectures comprised of the nanosheets with single-crystal or polycrystalline structure are respectively synthesized by a facile solvothermal method , and the influence of crystallinity structure on their sodium storage properties is revealed. It is found that the single-crystal structure can largely enhance the Na + intercalation kinetics in the crystal lattice and the structure stability during charge/discharge process. Therefore, the single-crystal VS 2 electrode exhibits an enhanced rate capability and cycling performance, delivering a high capacity of 193 and 172 mAhg −1 at a high rate of 0.5 and 1.0 Ag −1 , and 403 mAhg −1 after the following cycling test of 200 cycles at 0.2 Ag −1 . This work opens up new insights for the exploration and design of high-performance electrode materials for sodium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2024
·Vol. 26
·期 37
·5177-5186
·
IF 2.6
Zhichao Ren,Hongquan Yu,Xiangping Li,Jinsu Zhang,Sai Xu,Baojiu Chen
One-dimensional (1D) Y3Ga5O12:Pr3+ nanotubes (YGG:Pr3+ NTs) were prepared via single-nozzle electrospinning at 30% ambient humidity. The outer diameters of the YGG:Pr3+ NTs are between 190 and 210 nm, and the wall thickness is 35–45 nm. The nanotube consists of single-crystal YGG:Pr3+ nanoparticles. The optical properties of YGG:Pr3+ NTs with different Pr3+ concentrations, particularly their temperature-sensitive properties, were investigated. The YGG: 0.5% Pr3+ NTs exhibit the highest sensitivity of approximately 7.90 × 10−3 K−1 within the temperature range of 303–453 K.
研究领域:
材料科学
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物理学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials Express
·
2022
·Vol. 12
·期 4
·609-615
·
IF 1.111
Liu Hao,Fan Li,Wei Qichen,Song Haizeng,Zhu Hongliang,Hu Mengdi,Yan Shancheng
Anisotropic growth of selenium leads to formation of one-dimensional structure of selenium, and reaction conditions mostly determine the morphology of products. In this study, one-dimensional selenium materials were prepared directly from selenium powder by microwave-assisted method.
Selenium nanotubes and selenium nanorods were synthesized by adjusting the ratio of ethylene glycol to water. The as-prepared products were characterized by Transmission Electron Microscope (TEM), Selected area electron diffraction (SAED), X-ray diffraction (XRD), Raman spectroscopy, photoluminescence
spectroscopy and UV-Vis absorption spectroscopy, and their electrical properties were also tested. Results from High Resolution Transmission Electron Microscope (HRTEM), SAED and XRD patterns showed that the prepared selenium nanotubes had good single crystal microstructure, and its possible
growth direction of t-se nanotubes was 001. The selenium nanotubes had strong light response compared with dark condition under 650 nm laser irradiation. We hope that the selenium nanotubes will have a better development prospect in the direction of semiconductor devices.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Yunkai Sun,Xiaoxia Wu,Meng Cao,Xiaoqiang Xue,Dongfang Jiang,Zhao Liu
In the classical route of synthesizing of avanafil, the last step of the reaction uses EDCI and HOBT as an acid and amine binding agent. HOBT may contain residues of hydrazine, and potential mutagenic impurities containing acylhydrazide structures may be formed. The intermediate product (M6) of avanafil was synthesized by 6 steps using diethyl ethoxylmethylmalonate and S-methyl isothiourea semisulfide as starting materials. The potentially genotoxic impurity E (Imp-E) of avanafil was given by the reaction of M6 and hydrazine sulfate acid amine, yield of 20%. The single crystal of Imp-E was cultivated by solvent volatilization method, and its structure was analyzed by high resolution mass spectrometry (HRMS) and nuclear magnetic resonance spectroscopy (NMR). The Flack parameter of Imp-E was -0.03(3) by X-ray single crystal diffraction analysis, and the absolute configuration of Imp-E was determined as S configuration. The intramolecular / intermolecular hydrogen bonds of Imp-E make the molecules maintain a stable arrangement in space.
研究领域:
药物化学
·
晶体学
·
毒理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Long Ye,Xinyou He,Yao Shi,Zhiming Xiao,Wei Wang,Lei Cheng,Xinming Fan,Bao Zhang,Xing Ou
The instability in the structural integrity caused by interfacial issues is commonly regarded as the primary drawback of Ni-rich layered cathode materials (LiNi x Co y Mn 1-x-y O 2 , where x ≥ 0.8), which must be addressed before their commercial application. Herein, a novel multiple-function surface modification strategy is proposed based on the single crystal structure to in-situ achieve the construction of a coating layer and surface doping with Ce element to enhance the structural stability of the LiNi 0.88 Co 0.09 Mn 0.03 O 2 (NCM). Notably, the introduction of Ce-O bonding adjusts the local oxygen coordination to achieve a more stabilized structure of the oxygen framework, which inhibits the evolution of lattice oxygen and enhances conductivity. Additionally, by benefiting from the in-situ synthesized coating layer of Li x CeO 2 , the occurrence of side reactions on the surface is effectively alleviated, resulting in a reduction in electrode polarization. Combined with comprehensive electrochemical tests, it is confirmed that the improved electrochemical performance originates from the reduction of the detrimental H2-H3 phase transition and enhanced conductivity. As expected, the modified material with 1 wt% content of Ce (NCM@Ce) exhibits a high initial discharge capacity of 196.3 mAh g −1 with a capacity retention of 79.7 % after 200 cycles, and its energy density reaches 574.3 Wh kg −1 after 200 cycles.
研究领域:
材料科学
·
电化学
✓ 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）