OPTICAL MATERIALS
·
2022
·
IF 3.754
Xiaozhan Yang,Yicun Liang,Jing Shi,Yuanqiang wang,Wenlin Feng
Dual-lanthanide hollow metal-organic frameworks, Tb 1 -x / Eu x -MOFs ( x = 0, 0.02, 0.04, 0.06, 1) were successfully synthesized by a one-pot solvothermal method. The tunable luminescence color of green-yellow-orange-red can be achieved by variation of the Tb 3+ /Eu 3+ ratio. The energy transfer between Tb 3+ and Eu 3+ is confirmed by monitoring the excited states lifetime of 5 D 4 (Tb 3+ ) and 5 D 0 (Eu 3+ ), and can be regulated by water content , which indicates that organic ligand, 1,3,5-benzenetricarboxylic acid (H 3 BTC) has good antenna effect. Also, Tb 0.98 / Eu 0.02 -MOFs are used to be luminescence sensors for the detection of trace water and nitrobenzene (NB). By simultaneous monitoring of the emission intensity at 545 nm and 617 nm, the detection limits (LODs) for water are 0.0068% and 0.0081%, respectively. Those for NB are 0.0962 ppm and 0.0668 ppm, respectively. The sensing mechanisms (energy transfer for water and electron transfer for NB) are determined.
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2023
·Vol. 10
·期 13
·2207230
·
IF 15.1
Song Xiao,Haoying Wu,Nan Li,Xiangyu Tan,Haocheng Deng,Xiaoxing Zhang,Ju Tang,Yi Li
The liquid-solid contact electrification mechanism has been explored in the aqueous solution system, but there are few systematic studies on oil-solid triboelectrification. Herein, an oil droplet triboelectric nanogenerator (Oil-droplet TENG) is designed as the probe to investigate the charge transfer properties at oil-solid interface. The charge transfer kinetics process is disclosed by the electrical signals produced, showing that the electron species initially predominated the oil-solid triboelectrification. The molecular structure and electronic properties of oil also affect triboelectric performance. Further, the charge transfer principle in multi-component liquid mixture during the electric double layer (EDL) development process is proposed to explain the component competition effect. As a proof of concept, a tubular-TENG is designed as a self-powered sensor for transformer oil trace water detection. The device demonstrates high water sensitivity with a detection limit of 10 µL L −1 and a response range of 10–100 µL L −1 . This work not only reveals the oil-solid triboelectric and charge transfer competition mechanism in EDL, but also open up a new channel for real-time online monitoring of trace water in transformer oil, which holds promise for information perception and intelligent operation of transformers in the power industry.
研究领域:
材料科学
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电气工程
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemistrySelect
·
2023
·Vol. 8
·期 39
·e202302583
·
IF 2.1
Chunyan Yang,Qin Yang,Lei Chen,Nan Xu,Fubin Chen,Ting Pu
Graphical N-doped yellow fluorescent carbon quantum dots (Y-CDs) and red fluorescent carbon quantum dots were prepared by reacting o-phenylenediamine and p-phenylenediamine with terephthalic acid using solvothermal method. The emission wavelengths of Y-CDs and R-CDs are located at 530 nm and 600 nm, respectively. These two types of carbon dots can quench water in organic solvents and determine the content of water in them. In this work, we reported two nitrogen doped carbon quantum dot fluorescence sensors (Y-CDs and R-CDs) with good stability and luminescence efficiency, which can be quickly, sensitively and low-cost for the determination of trace water content in organic solvents. Using o-phenylenediamine and p-phenylenediamine as nitrogen sources and terephthalic acid as carbon sources, the preparation was carried out through simple solvothermal synthesis and heteroatom doping. The luminescence characteristics and interaction mechanism with the target were discussed. The results indicate that the two carbon dots can effectively quench the water content in acetone, ethanol, and DMF, as well as physical interactions such as hydrogen bonding and dynamic quenching, which are the reasons for the observed quenching effect. Based on this, a new method for determining water content in organic solvents using carbon quantum dot fluorescence probes has been established. The linear relationship between the fluorescence quenching efficiency F 0 /F of two carbon quantum dots and the water content in different organic solvents was studied. The detection limits (LOD) of water in acetone, ethanol and N,N-dimethylformamide (DMF) were 0.17 %, 2.35 %, 0.26 %, respectively, determined by Y-CDs. The LOQ of acetone, ethanol, and DMF were 0.554 %, 7.83 %, 0.855 %, respectively. The LOD of water in acetone, ethanol and DMF determined by R-CDs were 0.056 %, 0.69 %, 0.27 % and the LOQ was 0.187 %, 2.290 %, 0.909 %, respectively. Good recovery rates and precision were achieved in practical applications.
研究领域:
分析化学
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材料科学
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纳米技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Xiao-Fei Gu,Yue Zhao,Kan Li,Meng-Xiang Su,Fang Yan,Bo Li,Ying-Xiang Du,Bin Di
Structure elucidation of volatile aromatic isomers at trace level has long been considered as an elusive task, due to their structural similarities and similar polarities, even with the aid of many spectroscopic techniques such as mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy. Single-crystal X-ray diffraction (SCD) is recognized as one of the most powerful structural elucidation techniques. The recently developed crystalline sponge method overcomes the intrinsic limitation of SCD that the target molecules must be single crystals, being able to analyze non-crystalline and trace-amount compounds without any special treatment. In order to investigate whether the crystalline sponge method could be used for the structure elucidation of closely related isomers or other volatile and even oily compounds in complex mixtures at trace level, we combined HPLC separation with the crystalline sponge method for X-ray crystallographic analysis. In this paper, two pairs of volatile aromatic isomers including cis / trans isomers of asarone and positional isomers of carvacrol and thymol, as well as the main volatile component in essential oil extracted from Acorus Tatarinowii , were first isolated by HPLC and encapsulated into the crystalline sponge then elucidated by X-ray crystallographic analysis. Direct observation of these volatile compounds by X-ray crystallography was achieved using only microgram quantities without crystallization or derivatization. Unambiguous identification of these compounds was realized without reference standards. This strategy offers a promising platform capable of providing high-confidence detailed structural information of closely related isomers as well as other volatile and even oily compounds in complex mixtures in microgram quantities.
研究领域:
分析化学
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晶体学
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Zhaoxin Wang,Jinlan Wen,Jihang Zhang,Jiawei Deng,Wei Zhuang,Jinle Liu,Zhi Wang,Yuan Rao,Yudan Zhu,Hanjie Ying
Lipase catalysis plays an important role in bioengineering and food science and is widely used in the organic solvent environment. The addition of trace water to organic media can significantly change lipase activity, and the reason is essential to understand. In this study, by combining experiments and molecular dynamics simulations, we studied solvent-free acidolysis of the tripalmitin (PPP) with different water contents and revealed the mechanism of the water effect on lipase activity from atomic insight. Enzyme activity experimentally exhibited an increasing but subsequently decreasing trend with the rise of water content. Through molecular dynamics (MD) simulations, we found that the reaction activity was affected by three aspects: lipase flexibility, substrate diffusion and substrate spatial distribution. Lipase flexibility, as the structural basis of catalytic activity, increased with water content. At lower water content, the diffusion ability of the substrate around the lipase was dominant. With water content increasing, water molecules on the protein surface gradually shielded hydrogen bonds (HBs) between the oleic acids (OA) and the lipase, which improved the diffusion ability of the substrate near the enzyme surface and thus beneficial to the reaction occurring. At higher water content, the spatial distribution dominated the reaction, where the thicker water layer on the lipase surface acted as a spatial barrier hindering the access of substrate OA to the enzyme and thus harmful to the reaction. Our work helps to provide guidance on controlling enzyme activities in organic solvent systems.
研究领域:
生物工程
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食品科学
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酶学
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分子动力学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xueting Huang,Jiaxin Wen,Jinglei Lei,Guangsheng Huang,Fusheng Pan,Lingjie Li
A cost-effective and highly efficient electrolyte with a wide electrochemical window, high reversibility of Mg plating/stripping, non-/low-corrosivity, good compatibility with cathode materials, and tolerance of trace water and impurity is crucial for the commercialization of rechargeable magnesium batteries. In this work, a novel boron-centered non-nucleophilic electrolyte that meets all the above requirements is prepared via a facile and economic approach from the raw materials B(TFE)3/MgCl2/CrCl3/Mg (BMCM). The as-prepared BMCM electrolyte is mainly composed of tetracoordinated anions [B(TFE)4]− and solvated cations [Mg2(μ-Cl)2(DME)4]2+. The BMCM electrolyte demonstrates attractive electrochemical performance, with a low overpotential (∼139 mV), a high Coulombic efficiency (∼97%), a high anodic stability (∼3.5 V vs Mg/Mg2+), and a long-term (more than 500 h) cycling stability. Moreover, BMCM shows good compatibility with the CuS cathode material. The CuS|BMCM|Mg full cell delivers a discharge specific capacity of 231 mAh g–1 (at 56 mA g–1), which can retain ∼88% even after 100 cycles. Importantly, the BMCM electrolyte is cost-effective and tolerant of trace impurity and water, which has great potential to be commercialized. This work is expected to promote the development of practical rechargeable magnesium batteries.
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
LIQUID CRYSTALS
·
2023
·
IF 2.2
Xiaojing Wu,Xiaoling Niu,Shengbo Zhu,Min Tian,Weiguo Liu
Scientists are faced with a formidable problem in improving the smart properties of multi-stimuli responsive fluorescent materials. Here, we integrated two kinds of stimuli-responsive materials: aggregation-induced emission (AIE) and liquid crystals (LCs) into one system. An AIE-active fluorescence liquid crystal compound of α-cyanodistyrene derivate Py-CN-LBM8 was synthesised using knoevenagel condensation reaction. Its AIE effect, LC behaviour, multi-stimuli responsive properties and mechanisms were investigated by polarised optical microscopes (POM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), UV-visible (UV-vis) absorption spectra and photoluminescence (PL) spectra. The results showed that Py-CN-LBM8 exhibited significant physical response to external stimuli including temperature, mechanical force, solvent, pH and trace water. This work provided a strategy for designing new multi-stimuli responsive materials and made it possible to apply in the multifunction anti-counterfeit, sensor and information storage fields.
研究领域:
材料科学
·
化学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）