RADIOCHIMICA ACTA
·
2023
·Vol. 111
·期 12
·909-918
·
IF 1.8
Lingting Xia,Han Wu,Jing Gao,Tianzhen Ye,Long Qiu,Feize Li,Tu Lan,Jijun Yang,Jiali Liao,Ning Liu,Yuanyou Yang
In this work, a gallium–nickel alloy target with a weight percentage ratio of 7:3 was successfully prepared on Cu substrate in a chloride system at room temperature. A novel organic-solvent-free separation procedure based on two columns for extracting 68 Ge from irradiated Ga–Ni alloy target with high radionuclidic purity (99.99 %) was developed. By this separation procedure, the recovery of 68 Ge is 95 ± 5 % and the yield of 68 Ge via the nuclear reaction nat Ga(p, x n) 68 Ge was measured to be 0.27 ± 0.02 MBq/μA h.
研究领域:
核医学
·
放射化学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Yingying Li,Jie Zhang,Zengqiang Liang,Ran Yang,Lingbo Qu,Zhaohui Li,Yuanqiang Sun
It is of great significance for real-time monitoring of phosgene to protect public safety. In this paper, a new rhodamine derivate with highly rapid, special and sensitive response towards phosgene was synthesized and used as a phosgene probe based on its spirolactam ring-opening property and nucleophilic reaction with phosgene. To realize in situ visualization of phosgene, a fluorescent detection pen with gas-liquid reaction model was proposed for the first time using the mixture of the probe and polystyrene as ink. The detection film could be formed in situ by simply writing on desired surface and respond toward phosgene gas within 30 s with an ultra-low detection limit (2 ppm) with the naked eye. Such a fluorescence pen detection mode supplied a new strategy for the fabrication of an excellent platform for real-time detection of phosgene and other gas analytes.
研究领域:
化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Chinese Physics C
·
2023
·Vol. 47
·期 3
·034001
·
IF 3.6
Long He,Junhua Luo,Li Jiang
Measurement of the cross-sections of the 79Br(n, 2n)78Br, 81Br(n, p)81mSe, 81Br(n, α)78As, and 79Br(n, α)76As reactions was performed at specific neutron energies, precisely, 13.5±0.2, 14.1±0.2, 14.4±0.2, and 14.8±0.2 MeV, relative to the standard 93Nb(n, 2n)92mNb and 27Al(n, α)24Na reference reactions using offline γ-ray spectrometry and neutron activation. Monoenergetic neutrons were generated at the China Academy of Engineering Physics via a 3H(d, n)4He reaction using the K-400 Neutron Generator equipped with a solid 3H-Ti based target. The activity of the reaction produce was obtained using a high-purity germanium detector. The cross-sections of the (n, 2n), (n, p), and (n, α) reactions on the bromine isotopes were measured in the 13–15 MeV neutron energy range. The covariance analysis approach was employed for a thorough inspection of any uncertainties within the measured cross-section data. A discussion and comparison of the observed outcome were carried out with previously published data, especially with the results of the JENDL-4.0, JEFF-3.3, TENDL-2019, and ENDF/B-VIII.0 data libraries, along with the theoretical excitation function curve derived by employing the TALYS-1.95 program. Improved cross-section restrictions for the investigated processes in the 13–15 MeV neutron energy range will be obtained using the current findings, which will help to raise the caliber of associated databases. Furthermore, the parameters of relevant nuclear reaction models can be verified using this data.
研究领域:
核物理学
·
核工程
✓ 已验证
DOI
高影响因子
INORGANIC CHEMISTRY
·
2025
·
IF 4.7
Hongguang Kang,Xianwei Hu,Liang Tian,Jiangyu Yu,Aimin Liu,Zhongning Shi,Zhaowen Wang
The complex ions in NaCl-KCl-Al2S3 molten salts at temperatures of 923–1003 K were investigated via Raman spectroscopy and quantum chemistry calculations. The results showed the presence of Al2S3Cl–, AlSCl32–, and AlSCl2– in the molten salts. Besides that, there are two types of dissolution reactions for Al2S3: one is the reaction with Cl–, generating AlSCl32– and AlSCl2–, and the other is the reaction with Cl–, forming Al2S3Cl–. Once the temperature increases, the reaction between Al2S3Cl– and Cl– occurs, promoting the formation of AlSCl32– and AlSCl2–. Meanwhile, the reaction between AlSCl2– and Cl– occurs with the formation of AlSCl32–. With the increase in Al2S3 content, Al2S3 participates in the reaction with Cl–, producing Al2S3Cl–, which also leads to the formation of AlSCl2– and AlSCl32–. Meanwhile, the reaction of Al2S3Cl– with Cl– results in the generation of AlSCl32– and AlSCl2–. The non-bridging S atom in Al2S3Cl– and the S atoms in AlSCl32– and AlSCl2– are the easiest to be attacked by electrophilic molecules. In turn, the Al atom bonded to one Cl atom and two S atoms in Al2S3Cl– and the Al atoms in AlSCl32– and AlSCl2– are the primary sites reacting with nucleophilic molecules.
研究领域:
物理化学
·
材料科学
·
光谱学
·
无机化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2023
·Vol. 16
·期 7
·e202202252
·
IF 8.4
Wei-Chen Zheng,Zheng Huang,Chen-Guang Shi,Yaping Deng,Zi-Hao Wen,Zhen Li,Hui Chen,Zhongwei Chen,Ling Huang,Shi-Gang Sun
Graphical Ready, willing, and stable : Interphase stability issues affect the commercialization of Ni-rich cathode materials. In this study, interphase engineering improves the interphase stability of LiNi 0.83 Co 0.11 Mn 0.06 O 2 in lithium-ion batteries. A robust cathode-electrolyte interphase is constructed by a nucleophilic reaction in the commercial electrolyte and the cathode achieves long-term cycling stability in a Li||NCM83 cell. Ni-rich cathode materials are considered promising candidates for next-generation lithium-ion batteries because of their high energy density and low cost. However, interphase failure at the surface of Ni-rich cathodes negatively impacts cycling performance, making it challenging to meet the requirements of long-term applications. In this study, a strategy is developed to improve interphase properties through introduction of a nucleophilic reaction-based additive, using an appropriate amount of the inducer lithium isopropoxide (LIP) in the commercial electrolyte to achieve long-term cycling stability of Li||LiNi 0.83 Co 0.11 Mn 0.06 O 2 (NCM83) cells. This strategy enables Li||NCM83 cells to maintain a capacity of 148.7 mAh g −1 with a retention of 83.3 % even after 500 cycles. This outstanding cycling stability is attributed to a robust cathode-electrolyte interphase (CEI) constructed on NCM83 surface LIP-induce ring-opening polymerization of ethylene carbonate (EC). As a result, the organic-inorganic components of the CEI effectively constrain gas evolution and the corresponding phase transformation behavior. Furthermore, the CEI also suppresses microcrack formation and eventually sustains the Ni valence and coordination environment at high voltage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yuru Min,Lei Wang,Chenyao Yuan,Honglei Liu,Xiaole Gong,Mengyu Cao,Jiang-Tao Xu,Jingquan Liu
Indoor gaseous formaldehyde is the main environmental pollutant that can cause fatal threats to human health. A number of physical and chemical methods have been developed to tackle this issue. However, the existing methods are still unsatisfactory to meet the requirement of sustainable development owing to the flaws of low efficiency and reversible or second pollution. Herein, a chemical method based on a nucleophilic reaction between hydrazine and aldehyde that generates the only by-product of H2O is designed for the removal of formaldehyde. 1-Pyrenebutyric hydrazide was synthesized by a simple esterification reaction and then self-assembled on reduced graphene oxide (rGO) with a large surface area by forming π–π stacking to obtain a composite for chemical removal of gaseous formaldehyde under ambient conditions. In a practical test, the formaldehyde removal rate could reach 91% of the theoretical value, which meets the requirement for commercial formaldehyde removal applications. After 10 times recycling, the formaldehyde removal rate still remains as high as 85%. Moreover, the composite could be regenerated in weak acidic media, which greatly reduce the manufacturing cost in practical applications.
研究领域:
环境科学
·
材料科学
·
化学工程
·
可持续性
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYST
·
2018
·Vol. 144
·期 2
·536-542
·
IF 3.864
Hengchang Ma,Manyi Yang,Shaoxiong Zhang,Pei Yin,Tao Wang,Yuan Yang,Ziqiang Lei,Yucheng Ma,Yanfang Qin,Zengming Yang
Fluorescent probes are powerful tools for investigating reactive oxygen species (ROS) in living organisms. The overproduced “primary” ROS of superoxide anions (O2˙−) cause a chain of oxidative damage. In order to monitor O2˙− level fluctuations in living cells, we synthesized two reaction-type probes of TPA-DHP-1,2,3 and TPA-PPA-1,2,3, which were composed of an electron-rich triphenylamine (TPA) and the very active functional groups of dihydropyridine (DHP) and pyridinium (PPA). Intriguingly, DHP and PPA were able to carry out easy proton abstractions and nucleophilic reactions in the presence of O2˙−, resulting in the corresponding products with sharp wavelength shifts, and elevated fluorescence intensities. Therefore, undesirable background fluorescence interference can be reduced during the monitoring and imaging process. Meanwhile, the developed dual-channel monitoring strategy not only provides observations of the O2˙− level fluctuations, but could also be employed to image the dynamic accumulation process of probes in the different cell organelles. Therefore, the design could provide a simple, accurate and universal platform for biological applications in future research work.
研究领域:
化学
·
生物学
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2020
·Vol. 23
·期 2
·973-982
·
IF 9.48
Weiwei Wang,Yaqin Zhang,Zifeng Yang,Zhencai Zhang,Wenjuan Fang,Donghui Niu,Hongyan He,Fei Xu
In this study, a series of high-activity imidazole-based dicationic ionic liquids (DILs) were designed and prepared as efficient catalysts for balancing the reactivity between the endo-hydroxyl group (endo-OH) and the exo-hydroxyl group (exo-OH) of isosorbide (ISO) to synthesize high molecular weight poly(isosorbide carbonate) (PIC). Meanwhile, the thermal performance of PIC was precisely optimized by regulating the chain configuration. The results showed that when the trace amounts (4.5 × 10−5 based on the ISO molar amount) of bis-(3-methyl-1-imidazole)-ethylene dibromide ([C2(Min)2][Br]2) were used, the weight average molecular weight (Mw) of PIC reached 98 700 g mol−1. It could be concluded from the results of the experiment and the stimulation that the high catalytic activity of DILs was attributed to the strong electrostatic interaction between the cation and the substrate and the effective balance of the reactivity of the endo-OH and the exo-OH. Furthermore, we found that the reduction of hydroxyl groups in the terminal groups and the increase of endo–endo (a1) structure in the repeating unit improved the thermal properties of PIC. Finally, 1H NMR, Fourier infrared spectroscopy, and density functional theory (DFT) calculations were used to verify the reaction process through anion and cation multi-site synergistic effect and a possible electrophilic–nucleophilic reaction mechanism was successfully obtained.
研究领域:
高分子化学
·
材料科学
·
催化
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）