Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 19
·10425-10434
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IF 11.9
Ke Yang,Chan Li,Haoyuan Qi,Yunfei Dai,Yuhong Cui,Yibo He
The shuttle effect of polysulfides seriously hinders the practical application of lithium–sulfur (Li–S) batteries, and separator modification is supposed to be an effective way to solve this issue. Herein, MXene quantum dots (MQDs) were self-assembled on the surface of g-C3N4 sheets (g-C3N4@MQDs) by electrostatic adsorption principles to construct a functional layer on a Celgard separator. Making MXene into quantum dots was conducive to solving the agglomeration issue of its sheets, providing more active sites to capture the dissolved polysulfides. Moreover, the MQDs could also work as an electrocatalyst to further facilitate the Li2S catalytic conversion, obtaining a high deposition current and capacity (257.4 mA h g−1). Attributed to the regulation effect of MQDs toward the kinetic behavior of polysulfides, the shuttle effect was effectively mitigated. An as-fabricated Li–S battery with a heterostructured g-C3N4@MQD-based separator achieved a high specific capacity of 1433 mA h g−1 at 0.1 C, excellent rate performance (532 mA h g−1 at 4 C), and good cycling performance (0.024% capacity fading per cycle after 1000 cycles at 2 C). The rational design of the g-C3N4@MQD-based separator not only broadens the application of MQDs, but also presents new insights to develop high-performance Li–S batteries.
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JOM
·
2021
·Vol. 73
·期 12
·4103-4111
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IF 2.474
Wang Ying,Hou Jiyue,Li Xue,Hu Xiuqiong,Wang Yanjie,Yang Zhengwu,Ai Rui,Zhang Yiyong
This paper proposes the preparation of a S-Se-Ti 3 C 2 T x /TiO 2 cathode by etching Ti 3 AlC 2 with hydrofluoric acid and doping with selenium (Se). Through an electrochemical performance test, selenium is doped into the active material sulfur and forms a sulfur-selenium compound to compensate for the ‘chemical inertness’ of the elemental sulfur, thereby increasing the utilization rate of the active material. Taking advantage of the ability of TiO 2 to absorb polysulfide compounds and the high conductivity of carbides, the Ti 3 C 2 T x composite material, modified with TiO 2 nanodots, is constructed in situ as a sulfur-selenium composite material carrier, achieving a high sulfur content of 80%. S-Se-Ti 3 C 2 Tx/TiO 2 is used as the cathode, and the initial discharge specific capacity is as high as 1073 mAh g −1 , which improves the utilization of active materials and effectively inhibits the shuttle effect of lithium polysulfide intermediates.
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PEST MANAGEMENT SCIENCE
·
2023
·
IF 4.1
Hao-Lan Yang,Jia-Min Yu,Fu Cao,Wu-Ye Li,Bin Li,Xiao Lei,Shi-Guang Li,Su Liu,Mao-Ye Li
BACKGROUND Chlorantraniliprole (CAP) is a diamide insecticide with high efficacy against many pest insects, including the black cutworm, Agrotis ipsilon . Agrotis ipsilon is a serious pest causing significant yield losses in crops. Glutathione- S -transferases (GSTs) belong to a family of metabolic enzymes that can detoxify a wide range of pesticides. However, little is known about the functions of GSTs in CAP tolerance in A. ipsilon . RESULTS A cDNA sequence (designated AiGSTu1 ) encoding an unclassified GST was identified from A. ipsilon . AiGSTu1 is highly expressed during the 3 rd -instar larval and the pupal stages. Most of the mRNA transcripts were found in larval Malpighian tubules. Exposure to CAP strongly enhanced AiGSTu1 expression, GST activity, hydrogen peroxide (H 2 O 2 ) and malondialdehyde levels in larvae. H 2 O 2 treatment upregulated the transcription level of AiGSTu1 , suggesting that CAP-induced oxidative stress may activate AiGSTu1 expression. The activity of recombinant AiGSTu1 was inhibited by CAP in a dose-dependent manner. Metabolism assay results demonstrated that AiGSTu1 is capable of depleting CAP. Overexpression of AiGSTu1 enhanced the tolerance of Escherichia coli cells to H 2 O 2 and the oxidative stress inducer, cumene hydroperoxide. Silencing of AiGSTu1 by RNA interference increased the susceptibility of A. ipsilon larvae to CAP. CONCLUSION The findings of this study provide valuable insights into the potential role of AiGSTu1 in CAP detoxification and will improve our understanding of CAP tolerance in A. ipsilon . © 2023 Society of Chemical Industry.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Tao Feng,Teng Zhao,Shuangfei Zhu,Ziheng Wang,Lei Wei,Nanxiang Zhang,Tinglu Song,Li Li,Feng Wu,Renjie Chen
Lithium–sulfur batteries are attractive because of their high specific capacity and energy density, but issues with the polysulfide dissolution and shuttling intrinsically hinder their wide application. Here, hydroxylate multiwalled carbon nanotubes (MWCNT-OH) were grafted with a supramolecular polymer (heptakis(6-amino-6-deoxy)-β-cyclodextrin) to form a polysulfide-engulfing net, which was coated on a separator. Such a molecular microarray structure of a polymer can block the polysulfides and have biomimetic cellular behavior for engulfing polysulfides. The cavity (∼6 Å) and functional groups of the supramolecular polymer can provide a dynamic structure for reversible adsorption of polysulfides while the conductive MWCNT-OH ensure fast electron transfer. The batteries with the modified separator exhibited excellent rate capacities (945.5 and 625.4 mA h g–1 at 2 C and 4 C rates, respectively). Especially, the high areal capacities of 5.86 and 7.2 mA h cm–2 achieved at S loadings of 4.5 and 6.0 mg cm–2 and good cycling stability after 200 cycles at 0.1 C can be obtained. This demonstrates a strategy of supramolecular polymer-grafted carbon for dynamic polysulfide adsorption toward advanced Li–S batteries.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2021
·
IF 3.171
Lutai Song,Li Liu,Mingyuan Zhu,Bin Dai
The continuous expansion of vinyl chloride production increases environmental pollution caused by mercury catalysts, which is an issue that urgently needs to be solved. Green and stable catalysts should be researched to alleviate this issue. In this research, Thiolactic acid acts as a ligand where sulfhydryl groups form a stable complex with Au on the surface of a spherical activated carbon (SAC). An Au-thiolactic acid/SAC catalyst was designed with a Au theoretical loading of 0.5% (mass) to overcome the disadvantages of traditional Au-based catalysts, such as a low conversion rate and poor life cycle. The ratio of Au to ligand was screened, and the activity was best when Au/S = 1:8. The formation of the Au-S bond was proven by FT-IR and UV–vis. The longevity test of the Au1S8 /SAC catalyst was carried out at 1200 h −1 for 50 h. Samples with reaction times of 0 h, 5 h, 10 h, 20 h, and 50 h were taken to monitor the catalyst status. The XPS and TPR tests proved that the Au-S bond broke as the acetylene hydrochlorination reaction proceeded. The DFT calculation proved that the Au-S bond is the active site, and the sulfur atom promotes the adsorption of C 2 H 2 by the catalyst.
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EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Tanveer-Ul-Hassan Shah,Mudassir Hussain Tahir,Muhammad Sajjad Ahmad,Ata ur Rahman,Muhammad Arshad kamran,Hewen Liu
Hyperbranched Poly(amido amine)s (PAMAM) especially those containing disulfide groups have been highly investigated for DNA condensation, drugs and genes delivery. However, the detailed optical properties of PAMAM, intrinsic fluorescence characteristics and their applications for detection of thiols in pure aqueous medium have not been explored yet. Here we report for the first time the detailed investigation of optical properties of PAMAM and their biosensing application in pure aqueous medium. Three PAMAM named as MBAP (without disulfide group), CBAP and HPAP (with disulfide) groups were chosen, synthesized and characterized. Quantum yields of these PAMAM at different pH value were calculated in pure aqueous medium and all the PAMAM were found to be pH sensitive due to presence of tertiary amine and have shown increase in quantum yields in acidic medium. MBAP was not found to be redox sensitive due to the absence of disulfide group while CBAP has shown low redox sensitivity in aqueous medium because of low water solubility. HPAP has shown high redox sensitivity and high quantum yields hence applied for detection of thiols with the limit of detection of 5.29 mM in pure aqueous medium under physiological conditions. These investigations have not only shown the detailed optical properties of extremely important PAMAM but also broadens their application for bioimaging and biosensing.
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EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Zhen Zhao,Yiyang Gu,Danming Chao,Xincai Liu
Thermally responsive shape memory polymers have received great attention in the fields of biomedicine and aerospace. A new type of thermoplastic shape memory polymer with excellent mechanical and thermal properties was synthesized. A new reactable monomer with flexible alkyl chain was first designed and synthesized, then introducing it into the main chain structure of poly(aryl ether ketone)s. The alternating chain structure of the soft and hard segments and the H-Bonding between the carboxyl groups on the side chains both serve as physical cross-linking points in the polymer network, thereby imparting shape memory properties to the polymers. Polymers with more flexible segments exhibit better shape memory performance in terms of high shape fixing ratio and high shape recovery ratio.
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Materials Research Express
·
2019
·Vol. 6
·期 11
·115083
·
IF 1.449
Yanyan Chen,Qi Hu,Qiang Wang,Minghui Yu,Xiaoyu Gong,Tianyong Zha,Jingying Gao,Shenjie Li
In this article, a new simple one-step process to fabricate Cd–In–S luminescent quantum dot thin films (QDTFs) is provided. Metal sulfide precursor solutions were manufactured by directly adding a certain amount of butylamine and carbon disulfide in the ethanol solution followed by dissolving Cd(OH)2 and In(OH)3 powder. Cd–In–S luminescent QDTFs can be obtained by mixing Cd and In precursor solutions and then spinning on a cover slip and annealing on a hot plate at 190 °C under air atmosphere directly without complicated synthesis method. By changing the sintering parameters including the temperature, time and ratios of (Cd+In)/ligand, the Cd–In–S luminescent QDTFs covering the entire visible light wavelength from 470 to 628 nm can be obtained. The Cd–In–S luminescent QDTFs exhibited remarkable optical properties and has potential application in solar cell and light emitting diode, with the photoluminescence quantum yield of up to 36.5%.
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Chinese Physics B
·
2018
·Vol. 27
·期 6
·066108
·
IF 1.321
Qing Yu,Jiangjian Shi,Pengpeng Zhang,Linbao Guo,Xue Min,Yanhong Luo,Huijue Wu,Dongmei Li,Qingbo Meng
A study of the self-healing phenomenon of Cu2ZnSn(S, Se)4 (CZTSSe) solar cells has shown more than 10% enhancement in cell performance after storage at room temperature for a week, with a significant improvement in the open-circuit photovoltage (Voc) and fill factor (FF). In addition, up to 10.45% power conversion efficiency (PCE) has been achieved. No obvious change in crystallinity, crystal phase, optical absorption or elemental distribution in the CZTSSe films was detected on examining the x-ray diffraction (XRD) pattern, Raman spectrum, ultraviolet-visible (UV-Vis), and TOF-SIMS. Further investigations on the charge carrier concentration, charge radiative recombination, and band structure suggest that the enhancement in PCE stems mainly from a reduction in deep defects of the CZTSSe semiconductor film.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Yan Li,Tao Li,Long-Qiang Xiao,Yue-Fei Zhang
The polycondensation of 2-pyrazolines is presented. The products are oligomers with the five-membered rings of the 2-pyrazoline as the backbone and the reaction is a polycondensation reaction by decomposition of ROH from the hydrogen atom in the −NH– group and the −OR in the ester group. Metal catalysts, reaction periods, and the addition amounts of the catalyst are investigated to optimize the reaction conditions. The products are down-/up-conversion fluorescence molecules that can significantly enhance cell imaging through the synchronized excitation of visible and near-infrared light and may be widely used in other optical fields.
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Jove-Journal of Visualized Experiments
·
2018
·
IF 1.184
Yanlan Wang,Jiayu Liu,Haitao Pan,Jieyu Xing,Xiaoqiong Wu,Qing Li,Zhong Wang
This protocol describes the construction and functional studies of a bispecific antibody (bsAb), GPC3-S-Fab. bsAbs can recognize two different epitopes through their two different arms. bsAbs have been actively studied for their ability to directly recruit immune cells to kill tumor cells. Currently, the majority of bsAbs are produced in the form of recombinant proteins, either as Fc-containing bsAbs or as smaller bsAb derivatives without the Fc region. In this study, GPC3-S-Fab, an antibody fragment (Fab) based bispecific antibody, was designed by linking the Fab of anti-GPC3 antibody GC33 with an anti-CD16 single domain antibody. The GPC3-S-Fab can be expressed in Escherichia coli and purified by two affinity chromatographies. The purified GPC3-S-Fab can specifically bind to and kill GPC3 positive liver cancer cells by recruiting natural killer cells, suggesting a potential application of GPC3-S-Fab in liver cancer therapy.
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INTERNATIONAL JOURNAL OF PHARMACEUTICS
·
2017
·
IF 3.649
Wenxi Wang,Anna Shao,Shisen Feng,Min Ding,Gan Luo
S-layer proteins (Slps) are crystalline arrays of protein on bacterial cell surface layers. Owning to their capability to reassemble on the surface of lipid layers, Slps have been employed to modify liposomes for various profits. But the interaction information between Slps and positively charged liposomes are destitute, especially the gastrointestinal adhesion of Slps-coating liposomes is rarely reported. In the present work, the Slps extracted from Lactobacillus helveticus were reassembled on the surface of novel positively charged liposomes composed of soybean lecithin , Eudragit ® RL100 and cholesterol. The particle size and remarkable changes of Zeta potential with various Slps/lipid weight ratios were determined by dynamic light scattering and phase analysis light scattering. Significant difference in fluorescence dequenching percentage of liposomes decorated by ODA-FITC confirmed Slps self-reassemble on the surface of liposomes. A higher integrity of vesicular membrane after the addition of Triton X-100 solution demonstrated the stability enhancement of Slps-coating liposomes. Fourier transform infrared (FTIR) spectroscopy illustrated the interaction came from non-covalent bond. The mucoadhesion of Slps-coating liposomes was evaluated by the resident FITC-LP on the gastric and intestinal tract of mice at 7 h and 12 h after intragastrical administration, which proved that the Slps-coating improved the gastrointestinal adhesion significantly.
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危险品化学品经营许可证（带存储）