Nanoscale
·
2019
·Vol. 11
·期 45
·21917-21926
·
IF 6.97
Zhichao Lin,Jingjing Yan,Qingbin Cai,Xiaoning Wen,Hongye Dong,Cheng Mu
Co-modification of an electron transport layer (ETL) with metal oxides and organic molecules can optimize the structure of the ETL and improve the performance of perovskite solar cells (PSCs). Here, a sandwich-structured ETL consisting of MgO/SnO2/EA was designed by co-modifying a SnO2 ETL with magnesium oxide (MgO) and ethanolamine (EA). The device with an ETL modified with MgO and EA has excellent performance in enhancing electron transport and blocking holes. It also inhibits the formation of deep defect states and improves the stability of the device. The introduction of MgO effectively improves the open-circuit voltage (VOC) of the device, while EA increases the short-circuit current density (JSC). The optimal efficiency of the PSC using the ETL co-modified with MgO and EA is 20.23%, which is much higher than that of the device with the unmodified SnO2 ETL (17.94%). The method described here provides an effective way to develop high performance ETLs co-modified with metal oxides and organic compounds for perovskite-based optoelectronic devices.
研究领域:
材料科学
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能源科学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Yu-Han Hu,Qiu-Yan Wang,Li-Hong Ye,Juan Yang,Xin Dong,Hui Zheng,Jian Zhou,Jun Cao
A simple, rapid and environmentally friendly method named effervescence-assisted matrix solid-phase dispersion (EA-MSPD) was investigated for the extraction of four coumarins (esculin, esculetin, fraxin and fraxetin) from Crotex fraxini ( C. fraxini ). In this study, an effervescent tablet containing carbon dioxide sources (100 mg sodium bicarbonate and 200 mg sodium dihydrogenphosphate) and an adsorbent (25 mg benzo-15-crown-5) was prepared. The effervescent tablet was dissolved into an aqueous solution, and as a consequence of the effervescence reaction, carbon dioxide was generated, thus making the sample better a dispersion of the extraction solvent (100 mM sodium dodecyl sulfate). The variables that influenced the extraction efficiency included effervescent salts, extraction solvents and crown ether. These values were represented using ultra- high-performance liquid chromatography (UHPLC). Good linearity was exhibited by coefficients of determination all equal to 1, limits of detection ranging from 1.62 to 3.83 ng·mL −1 and limits of quantification ranging from 5.39 to 12.76 ng·mL −1 . The recoveries ranged from 91.37 to 100.29% with relative standard deviations of 0.57–4.58% under optimized conditions. In this work, the proposed EA-MSPD method was successfully applied to extract and identify four coumarins in C. fraxini . Compared with previously reported methods, the method examined herein was faster, greener and more sensitive.
研究领域:
分析化学
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药学
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DOI
高影响因子
RADIATION PHYSICS AND CHEMISTRY
·
2012
·
IF 1.227
Desheng Su,Wenqi Niu,Sheng Liu,Chengyin Shen,Chaoqun Huang,Hongmei Wang,Haihe Jiang,Yannan Chu
Photoemission electron attachment ion mobility spectrometry (PE-EA-IMS), with a source of photoelectrons induced by vacuum ultraviolet radiation on a metal surface , has been developed to study electron attachment reaction at atmospheric pressure using nitrogen as the buffer gas . Based on the negative ion mobility spectra, the rate constants for electron attachment to tetrachloromethane and chloroform were measured at ambient temperature as a function of the average electron energy in the range from 0.29 to 0.96 eV. The experimental results are in good agreement with the data reported in the literature.
研究领域:
物理化学
·
分析化学
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产品关联
DOI
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2019
·
IF 4.959
Xiao Huang,Chun Chen,Xinting Zhu,Xi Zheng,Sanhua Li,Xingquan Gong,Zuli Xiao,Nian Jiang,Cangyan Yu,Caixia Yi
Tyrosinase inhibitors could effectively limit the activity of tyrosinase in melanocytes to reduce the excessive synthesis and deposition of melanin. However, low skin permeability and lacking in targeting greatly restricted their application. Herein, ZnO quantum dots were synthesized by gel-sol method and grafted with BQ-788, which have been employed as transdermal and targeting carrier to delivery ellagic acid to melanocytes. Ellagic acid loaded ZnO quantum dots with the size distribution of around 9 nm could targetedly bind to melanocytes and enter the melanocytes by endocytosis within 1 h. The ellagic acid release behavior was controlled by the decreasing of pH via the rapid dissolution of ZnO. When the concentration of BQ-788/EA@ZnO was 12.5 μg/mL, the inhibition rate on tyrosinase activity and melanin deposition were up to 44.23 ± 4.97% and 37.50 ± 5.23%, respectively. In view of their good biocompatibility, they were of great potential in clinically external application for tyrosinase inhibition.
研究领域:
药学
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生物医学工程
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皮肤科学
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DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2026
·
IF 8.8
Chenxuan Shao,Weijia Kong,Changqing Miao,Yafang Wu,Xiaohui Ju,Yujia Tong,Weixing Li,Weihong Xing
Separation membranes for purification of fermentation broths represent a significant research challenge. In order to enhance separation efficiency, a simple and rapid one-step method with self-assembly strategy for hydrophilic modified membranes was proposed. In order to shorten membrane fabrication time, ellagic acid (EA) oxidized by sodium periodate (SP) and then reacted with p-phenylenediamine (PPDA) via Michael addition and Schiff base reactions at 25 °C. A highly crosslinked hydrophilic network formed firmly adheres to PVDF substrate. According to molecular dynamic simulation, the adsorption energy for the proposed PVDF@EA-PPDA membrane with water reached −830 kcal/mol, which was 4.1 times that of pristine PVDF membrane. The modified membrane exhibited the high permeability of 11265 L m −2 h −1 ·bar −1 for water and 3450 L m −2 h −1 ·bar −1 for soy protein fermentation broth. The solids and oil rejection arrived at 99.3% and 99.9%, respectively. The developed membranes showed significant antifouling characteristics with the flux recovery rate exceeding 95%, which had promising potential for protein purification in biomedical field.
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2019
·
IF 3.074
Chuang Zhou,Ziming Yang,Li Zhang,Enming Dong,Zuyu He,Xianwu Liu,Chao Wang,Yan Yang,Jing Jiao,Yunhao Liu,Yu Chen,Puwang Li
In this work, carboxymethyl chitosan-graft-eleostearic acid (CMCS-g-EA) was synthesized via the amide reaction between the amino groups of carboxymethyl chitosan and the carboxyl group of eleostearic acid, and then mPEG-NH 2 was grafted to CMCS-g-EA to prepare amphiphilic polymers (mPEG-CMCS-g-EA). The chemical structures of the above conjugates were characterized by FT-IR and 1 H NMR. Both CMCS-g-EA and mPEG-CMCS-g-EA based nano-vesicles were prepared by ultrasonic self-assembly method and they exhibited a low critical aggregation concentration (CAC) of 14.97 μg/mL, 16.82 μg/mL, respectively. The spinosad-loaded mPEG-CMCS-g-EA nano-vesicles (SSD@mPEG-CMCS-g-EA NVs) were spherical in shape with an average diameter of 502.8 nm and the zeta potential of −25.60 mV. The encapsulation efficiency (EE) and drug loading content (LC) of SSD@mPEG-CMCS-g-EA nano-vesicles were 42.00%, 23.07%, respectively. In vitro release revealed that the SSD@mPEG-CMCS-g-EA nano-vesicles exhibited a sustained and pH-responsive drug release property, and could significantly enhance the photostability of spinosad . Furthermore, the toxicological tests demonstrated that the SSD@mPEG-CMCS-g-EA nano-vesicles could efficiently inhibit the growth and development of Helicoverpa armigera . These results indicated that the SSD@mPEG-CMCS-g-EA nano-vesicles were highly potential for the treatment of Helicoverpa armigera .
研究领域:
农药科学
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生物材料学
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昆虫学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
·
2014
·
IF 2.227
Hui Gao,Wenqi Niu,Chaoqun Huang,Yan Hong,Chengyin Shen,Hongmei Wang,Yan Lu,Xiaojing Chen,Lei Xia,Haihe Jiang,Yannan Chu
The photoionization electron attachment ion mobility spectrometry (PI-EA-IMS), with photoelectrons formed by photoionization of organic compound like acetone, has been developed to study electron attachment reactions. With this apparatus, the rate constants for electron attachment to alkyl iodides including ethyl iodide (C 2 H 5 I), 1-propyl iodide (1-C 3 H 7 I), 1-butane iodide (1-C 4 H 9 I) and 2-propyl iodide (2-C 3 H 7 I) have been determined over the average electron energy from 0.29 to 0.96 eV. The rate constants are in the order of magnitude of ∼10 −9 cm 3 molecule −1 s −1 . The experimental measurements show that for straight-chain alkyl iodides, the values of the rate constants follow the order of: k (C 2 H 5 I) < k (1-C 3 H 7 I) ≈ k (1-C 4 H 9 I) which can be explained by the energy threshold for the formation of iodine anion via dissociative electron attachment. For the isomers, 2-C 3 H 7 I has a lower rate constant than 1-C 3 H 7 I which may be caused by the effect of branched chain.
研究领域:
化学动力学
·
物理化学
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2016
·
IF 2.478
Bin Chen,Shenwen Fang,Ting Chen,Yan Xiong,Ming Duan
Compound poly(methylmethacrylate (MMA)-acrylic acid (AA)-ethyl acrylate (EA))/Fe 3 O 4 superparamagnetic nanoparticles were synthesized successfully by emulsion polymerization and solvothermal reaction methods. The nanoparticles were characterized by transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), Fourier transform infrared spectra (FT-IR), X-ray diffraction (XRD) and thermogravimetry analysis (TGA). P(MMA-AA-EA)/Fe 3 O 4 nanoparticles exhibited superparamagnetic properties with a saturation magnetization value of 20 emu/g. The selective adsorption behaviors of nanoparticles toward dyes were investigated and the function of electronic interaction during the adsorption process was also discussed.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MASS SPECTROMETRY
·
2026
·Vol. 61
·期 9
·e70105
·
IF 2.1
Li Hongwei,Feng Lianjun,Xu Junjie,Zhao Lei
An improved method was proposed, which addressed the technical challenge of incomplete combustion and conversion of high‐temperature, high‐pressure metamorphic graphite—a chemically stable material for conventional EA‐IRMS method analysis. The method was based on the addition of an efficient oxidant. Using graphite from a Sri Lankan charnockite (G1) and graphite containing pyrite (G2) as test materials, the effects of oxygen injection modes and solid oxidants (CuO and V 2 O 5 ) on combustion efficiency were evaluated. It was demonstrated that merely increasing oxygen flow rate or duration failed to achieve complete oxidation of the samples, whereas the addition of V 2 O 5 effectively resolved the problem. By optimizing reaction conditions, an optimal analysis method was proposed: mixing the graphite sample with V 2 O 5 at a mass ratio of no less than 1:6 and injecting oxygen at a flow rate of 175 mL/min for 6 s. Under these conditions, both types of refractory graphite samples achieved complete combustion, significantly enhancing carbon conversion efficiency, ensuring the accuracy of δ 13 C analyses. The method substantially extends the applicability of EA‐IRMS technology for isotope analysis of inert geological carbon materials, providing reliable and critical support for research on deep carbon cycling, graphite deposit genesis, and related studies.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaodi Zhang,Guojie Zhang,Xiaowei Qin,Jun Liu,Guoqiang Li,Ying Xu,Yongkang Lv
A series of nitrogen doped biomass carbon catalysts were prepared through two different nitrogen doped methods by using soybean meal as the raw material, melamine as nitrogen source and KOH as the activators. The catalysts were characterized by BET, SEM , CO 2 -TPD, EA , FTIR , XPS and Raman. The catalytic performances of CH 4 –CO 2 reforming over different samples were also studied. The results show that the preparation method of the catalyst significantly affects the structural characteristics, N content and N species type of the catalyst. The characterization results also show the proportion of pyrrolic-N in the catalyst prepared by in-situ nitrogen doped method (Y-NC) is higher than that in prepared by the post-treatment method (H-NC). Pyrrole-N is more conducive to the adsorption and activation of CO 2 . So, the catalyst prepared by in-situ nitrogen doped method has good catalytic activity and stability. The conversion of CH 4 and CO 2 were respectively 40% and 65% at 900 °C after 50 h of CH 4 –CO 2 reforming reaction .
研究领域:
催化
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材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
Nature Catalysis
·
2023
·Vol. 6
·期 2
·174-184
·
IF 37.8
Hua Wuxing,Shang Tongxin,Li Huan,Sun Yafei,Guo Yong,Xia Jingyi,Geng Chuannan,Hu Zhonghao,Peng Linkai,Han Zhiyuan,Zhang Chen,Lv Wei,Wan Ying
Understanding sulfur conversion chemistry is key to the development of sulfur-based high-energy-density batteries. However, unclear relationships between the electronic structure of the catalyst and its activity are the major problem. Here, we provide a direct correlation between the p electron gain of S in p -block metal sulfides and the apparent activation energies ( E a ) for the sulfur reduction reaction (SRR), in particular, Li 2 S n to Li 2 S conversion, which is the rate-determining step of the SRR. The maximum p charge occurs in bismuth sulfide and results in the lowest E a and a high SRR rate in the cathode. Li–S batteries with the Bi 2 S 3 catalyst work steadily at a high rate of 5.0C with a high-capacity retention of ~85% after 500 cycles. A high areal capacity of ~21.9 mAh cm −2 was obtained under a high sulfur loading of 17.6 mg cm −2 but a low electrolyte/sulfur ratio of 7.5 μl mg −1 .
研究领域:
材料科学
·
电化学
·
电池技术
·
催化
✓ 已验证
DOI
高影响因子
Food Chemistry-X
·
2025
·
IF 8.2
Libing Zhou,Chunli Huang
This study employed a range of indicators, including heat of combustion, combustibility, fat content, amino acid content, ash content, crude fiber content, trace element content, and concentrations of catechins, theanine, and caffeine, to develop comprehensive evaluation systems for assessing the quality of five tea samples: Duyun Maojian tea, Liping fragrant tea, Shuicheng spring tea, Huaxi jasmine tea, and Zunyi black tea. Analytical techniques such as gray pattern recognition (GPR), gray principal component analysis (GPCA), gray factor analysis (GFA), entropy analysis (EA), and factor cluster analysis (FCA) were utilized. Based on the 42variable data, the nutritional value ranked as follows: Shuicheng spring tea > Huaxi jasmine tea > Duyun Maojian tea > Liping fragrant tea > Zunyi black tea. These findings offer significant theoretical and practical insights for the determination and comprehensive evaluation of tea quality indicators, contributing to scientific research on the nutrition, health, and classification aspects of tea.
研究领域:
食品科学
·
植物化学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）