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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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
·
2023
·
IF 9.5
Zhili Li,Jiye Zhang,Pengfei Luo,Jiayi Chen,Bowen Huang,Yuzhe Sun,Jun Luo
Silver chalcogenides demonstrate great potential as flexible thermoelectric materials due to their excellent ductility and tunable electrical and thermal transport properties. In this work, we report that the amorphous/crystalline phase ratio and thermoelectric properties of the Ag2SxTe1–x (x = 0.55–0.75) samples can be modified by altering the S content. The room-temperature power factor of the Ag2S0.55Te0.45 sample is 4.9 μW cm–1 K–2, and a higher power factor can be achieved by decreasing the carrier concentration as predicted by the single parabolic band model. The addition of a small amount of excessive Te into Ag2S0.55Te0.45 (Ag2S0.55Te0.45+y) not only enhances the power factor by decreasing the carrier concentration but also reduces the total thermal conductivity due to decreased electronic thermal conductivity. Owing to the effectively optimized carrier concentration, the thermoelectric power factor and dimensionless figure of merit zT of the sample with y = 0.007 reaches, respectively, 6.2 μW cm–1 K–2 and 0.39, while the excellent plastic deformability is well maintained, demonstrating its promising potential as a flexible thermoelectric material at room temperature.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 34
·期 10
·3125-3136
·
IF 3.4
Longwei Shi,Zheng Zhao,Lishuai Zong,Jinyan Wang,Xigao Jian
Limiting molecules' polarized motion effectively reduces the dielectric loss of materials. This article synthesized side chains with different lengths using p-ethoxyphenol, p-hydroxybenzoic acid, and long-chain halohydrins through a two-step process. These chains' movement was almost unaffected by the main chain of polymers, so they can fill up the free volume of polymers under certain conditions. 1,2-dihydro-4-(4-hydroxyphenyl)phthalazine-1-(2H)-one(DHPZ), 4,4'-Difluorophenyl sulfone(DFS), and 4,4-Bis(4-hydroxyphenyl) valeric acid(HPV) obtained three polymers with different carboxyl groups (10%, 30%, and 50%) through nucleophilic substitution. They were then grafted and treated with hot-pressing. The introduction of side chains could reduce the free volume of polymers under hot-pressing conditions, so further reducing the dielectric loss of materials. Polymer with the shortest and least (10%) side chains showed the most obvious dielectric loss tangent, the reduction rate of the film's dielectric loss tangent was 13.11% (at T g + 15°C, while the non-grafted one was only 3.69%) and 20.70% (at T g + 80°C, while the non-grafted one was only 8.35%), respectively. In addition, WXRD and DMA tests showed that films' intermolecular chain spacing (“ d ”) and T g changed after the hot-pressing process, respectively. The change law of both was consistent with that of dielectric loss tangent. Confirm that grafting high-motility side chains can significantly reduce polymer's dielectric loss by enhancing the free volume reduction effect after hot-pressing.
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MATERIALS RESEARCH BULLETIN
·
2023
·
IF 5.4
Yue-Jie Bai,Li-Ying Liu,Xun-Kai Duan,Guang-Xuan Zhang,Chao Wang,Xin-Yu Zhou,Changhao Wang,Bing-Rong Wang,Xiao-Lin Wei,Ru-zhi Wang
To further develop sensing materials for NO 2 gas detection practical application, the operating temperature of the sensor should be significantly reduced. In this paper, In 2 O 3 flowers were prepared by the microwave-assisted hydrothermal method . Then, In 2 O 3 was doped using TAA (thioacetamide). The prepared S-doped In 2 O 3 flowers have good gas sensitivity and significantly reduced operating temperature. When exposed to 10 ppm NO 2 gas, the corresponding response was 250 at 118 °C. It can be demonstrated by the first principle calculations, in which the doping of S atoms changes the electron structure of In 2 O 3 from semiconductor to metal with a lower potential barrier. Then, significantly affects the electron crossing the intergranular potential barriers. Therefore, the operating temperature of the sensor can be reduced. Our research results will provide new research ideas and technical approaches for designing, fabricating, and applying a new generation of In 2 O 3 gas sensors.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 19
·10425-10434
·
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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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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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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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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Journal of Materials Chemistry A
·
2024
·
IF 10.7
Xi Chen,Wei Zhou,Xu Fang,Cheng Li,Die Cong,Tie Yu,Wei-Qiao Deng,Chengcheng Liu
Photocatalytic CO2 reduction to syngas has recently garnered substantial interest due to its mild reaction conditions, high safety, and environmental sustainability. However, the efficiency of syngas production remains relatively low. In this study, we have developed metallosalen-based poly(ionic liquid)s (PILs) to enhance syngas production, achieving one of the highest production rates recorded to date. The Co(Salen)-PIL demonstrates a syngas production rate of 168.1 mmol g−1 h−1, including a CO production rate of 69.3 mmol g−1 h−1, which is more than eight times higher than that of the best previously reported organic materials. Mechanistic investigations reveal that pyridine ions facilitate electron transfer from the heptazine light-harvester to the Co(Salen) active site. This study lays the groundwork for developing high-performance catalysts for photocatalytic syngas production.
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CHEMICAL RESEARCH IN TOXICOLOGY
·
2016
·
IF 3.025
Hui Wang,Yukun Feng,Qian Wang,Xiucai Guo,Wenlin Huang,Ying Peng,Jiang Zheng
Benzbromarone (BBR) is a therapeutically useful uricosuric agent but can also cause acute liver injury. The hepatotoxicity of BBR is suggested to be associated with its metabolic activation. Our recent metabolic study demonstrated that BBR was metabolized to epoxide intermediate(s) by cytochrome P450 3A, and the intermediate(s) was reactive to N-acetylcysteine. The objectives of the present study were to determine the chemical identity of the interaction of protein with the epoxide intermediate(s) of BBR and to define the association of the protein modification with hepatotoxicity induced by BBR. Microsomal incubation study showed that the reactive intermediate(s) covalently modified microsomal protein at cysteine residues. Such adduction was also observed in hepatic protein obtained from liver of mice given BBR. The protein covalent binding occurred in time- and dose-dependent manners. Pretreatment with ketoconazole attenuated BBR-induced protein modification and hepatotoxicity, while pretreatment with dexamethasone or buthionine sulfoximine potentiated the protein adduction and hepatotoxicity induced by BBR. A good correlation was observed between BBR-induced hepatotoxicity and the epoxide-derived hepatic protein modification in mice. The present study provided in-depth mechanistic insight into BBR-induced hepatotoxicity.
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