EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Guofei Chen,Gang Xu,Yang Jiao,Yongmei Tang,Liyun Tan,Xingzhong Fang
Two series of transparent cardo polyimides (PIs) derived from bisphenol fluorenes and 1,4-bis(4-fluorophthalimide)cyclohexanes (BFCH) with different ratios of trans- and cis - 1,4-diaminocyclohexane were prepared via aromatic nucleophilic substitution. These PIs exhibited high glass transition temperatures ( T g s) of 271–352 °C, 5% weight loss temperatures ( T d 5% ) of 400–433 °C in nitrogen, mechanical properties of tensile strengths of 62–107 MPa, tensile moduli of 3.0–4.4 GPa and elongations at break of 1.7–4.5% and great solubility in a variety of organic solvents. These PI films appeared excellent optical transparency, which displayed the cut-off wavelengths from 323 to 355 nm and high transmittance at 450 nm with more than 85 %. The steric effects of different substituent groups on bisphenol fluorene and different ratios of trans / cis configuration were also investigated.
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COMBUSTION AND FLAME
·
2022
·
IF 5.767
Hua Fang,Peng Deng,Rui Liu,Kehua Han,Pengfei Zhu,Jianxin Nie,Xueyong Guo
Metal hydride has been used as a potential energetic material due to its high hydrogen storage density, high reactivity, high mass calorific value and large gas production. But it was still a great challenge towards optimizing and enhancing the energy-releasing properties of metal hydride. In this work, a novel molecular perovskite energetic material (H 2 dabco)[NH 4 (ClO 4 ) 3 ] (DAP-4) was introduced as a high energy oxidant to fabricate metal hydride (MH 2 , M=Mg, Ti, and Zr) based energetic composites. The thermal decomposition, ignition and combustion characteristics of MH 2 -based energetic composites were studied. The results showed that molecular perovskite energetic material DAP-4 was beneficial as oxidant in MH 2 -based high-energy solid composites, which were originated from its high energy properties and strong oxidation capacity. The ignition and combustion reaction mechanisms of MH 2 with DAP-4 as oxidant were provided. This work offered an effective way to realize energy-releasing performance of MH 2 by molecular perovskite energetic materials introduced for their potential application.
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ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Jihong Zheng,Fumin Li,Chong Chen,Qing Du,Mengqi Jin,Huilin Li,Mingxing Ji,Zhitao Shen
2,2′,7,7′-Tetrakis(N,N-di-p-methoxyphenyl-amine)-9,9′-spirobifluorene (spiro-OMeTAD), the most widely used hole transport material in high-efficiency perovskite solar cells (PSCs), still has serious defects, such as moisture absorption and poor long-term conductivity, which seriously restrict further improvement of the power conversion efficiency (PCE) and stability of the cell. Herein, to overcome these problems, inorganic salt PbSO4(PbO)4 quantum dots (QDs) are incorporated into spiro-OMeTAD as the hole transport layer (HTL) for the first time. The incorporated PbSO4(PbO)4 QDs significantly hinder the agglomeration of lithium bis(trifluoromethanesulfonyl)-imide and improve the long-term conductivity through the oxidative interaction between PbSO4(PbO)4 QDs and spiro-OMeTAD and hydrophobicity of the HTL. Furthermore, the spiro-OMeTAD:PbSO4(PbO)4 composite film can effectively passivate perovskite defects at the perovskite/HTL interface, resulting in suppressed interfacial recombination. As a result, the PSC based on the spiro-OMeTAD:PbSO4(PbO)4 HTL shows an improved PCE of 22.66%, which is much higher than that (18.89%) of the control device. PbSO4(PbO)4 also significantly improves the moisture stability for 50 days at room temperature (at RH ∼ 40–50%) without encapsulation. This work indicates that inorganic PbSO4(PbO)4 QDs are crucial materials that can be employed as an additive in spiro-OMeTAD to enhance the efficiency and stability of PSCs.
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高影响因子
MACROMOLECULAR BIOSCIENCE
·
2022
·Vol. 22
·期 6
·2100524
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IF 5.859
Shuaishuai Yuan,Xiuxia Sun,Yong Shen,Zhibo Li
Antibacterial and hemostatic properties are of great importance to wound dressing in treating trauma. Poly(4-hydroxybutyrate) (P4HB), an U.S. Food and Drug Administration (FDA)-approved bioabsorbable polyester, is used as dermal substitutes to prevent sever wound contraction and improve wound healing. However, P4HB fibrous mats are not efficient in halting bleeding and preventing bacterial associated infection. Here the authors prepare a new kind of wound dressing by incorporating poly(ethylene glycol) (PEG) and zinc oxide (ZnO) nanoparticles into the P4HB matrix by using electrospinning method. The in vitro results reveal that the P4HB/PEG/ZnO dressings can synergistically help blood clotting, prevent bacteria adhesion, and kill bacteria efficiently. It's found that the bactericidal activity of the bioactive P4HB/PEG/ZnO dressings is related to the release of Zn 2+ ions rather than reactive oxygen species (ROS) under dark condition. The in vivo antibacterial evaluation indicates that the bioactive P4HB/PEG/ZnO dressings can successfully prevent wound infections in Sprague–Dawley (SD) rats’ skin defect model. The in vivo hemostatic experiments evaluated in the rabbit ear injury model further confirm that the bioactive P4HB/PEG/ZnO dressings have excellent hemostatic performance. Hence, this study demonstrates that the bioactive P4HB/PEG/ZnO dressings with hemostatic and bactericidal properties have great potential in possible clinical applications.
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CHEMICAL ENGINEERING JOURNAL
·
2022
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IF 16.744
Yuan Zhong,Kai Qu,Wenhua Yan,Kun Zhang,Xian Qin,Yi Wang,Meng Yan,Shuai Wu,Li Zhu,Essam Abdo Mohammed Saad Obaid,Guixue Wang,Wei Wu
The development of atherosclerosis (AS) is closely related to inflammation. The common feature of inflammatory sites is upregulation of vascular cell adhesion molecule-1 (VCAM-1), which has a strong affinity with very late antigen-4 (VLA-4). Endothelial cell membranes overexpressing VLA-4 (OEM) were used to camouflage rapamycin nanoparticles (RAP NPs) with reactive oxygen species (ROS) responsiveness to construct biomimetic nanodrugs [email protected] NPs. These nanoparticles were capable of enhancing the active target drug delivery and ROS-responsive drug release under the pathological overexpression of VCAM-1 and accumulation of ROS stimulus. In vitro and in vivo investigations confirmed that [email protected] NPs could enhance the active target drug delivery to atherosclerotic plaques and increase drug accumulation in the focal site, thus improving the bioavailability of drugs, reducing side effects and inhibiting the occurrence and development of atherosclerosis.
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Journal of Energy Chemistry
·
2022
·
IF 13.599
Licheng Lou,Yuancai Gong,Jiazheng Zhou,Jinlin Wang,Xiao Xu,Kang Yin,Biwen Duan,Huijue Wu,Jiangjian Shi,Yanhong Luo,Dongmei Li,Hao Xin,Qingbo Meng
Photo-generated carrier recombination loss at the CZTSSe/CdS front interface is a key issue to the open-circuit voltage ( V OC ) deficit of Cu 2 ZnSnS x Se 4− x (CZTSSe) solar cells. Here, by the aid of an easy-handling spin-coating method, a thin PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) layer as an electron extraction layer has been introduced on the top of CdS buffer layer to modify CZTSSe/CdS/ZnO-ITO (In 2 O 3 :Sn) interfacial properties. Based on Sn 4+ /DMSO (dimethyl sulfoxide) solution system, a total-area efficiency of 12.87% with a V OC of 529 mV has been achieved. A comprehensive investigation on the influence of PCBM layer on carrier extraction, transportation and recombination processes has been carried out. It is found that the PCBM layer can smooth over the CdS film roughness, thus beneficial for a dense and flat window layer. Furthermore, this CZTSSe/CdS/PCBM heterostructure can accelerate carrier separation and extraction and block holes from the front interface as well, which is mainly ascribed to the downward band bending of the absorber and a widened space charge region. Our work provides a feasible way to improve the front interfacial property and the cell performance of CZTSSe solar cells by the aid of organic interfacial materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Zhaojie Yang,Minghua Zhang,Zhixin Zhao,Wenting Lan,Xi Zhang,Minmin Fan
To avoid the detrimental effect of aryl ethers on the alkali stability of anion exchange membrane (AEM), elaborately designed and synthesized poly(styrene- co -4-vinyl pyridine) (PS4VP) copolymer without aryl ether linkages is used to prepare AEMs. By introducing commercialized polyquaternium-10 (PQ-10) as the main ion-conducting molecule, the fully-interpenetrating polymer network quaternized PS4VP/PQ-10 (F-IPN QPS4VP/PQ-10) AEMs are prepared by cross-linking PS4VP and PQ-10, respectively. The as-prepared F-IPN QPS4VP/PQ-10 AEMs have obvious nanoscale microphase-separated morphologies, which ensure the membranes have good mechanical properties and dimensional stability. With optimized component ratios, F-IPN QPS4VP/PQ-10 AEM exhibits high ionic conductivity (74.29 mS/cm at 80 °C) and power density (111.83 mW/cm 2 at 60 °C), as well as excellent chemical stabilities (94.36% retaining of initial mass after immersion in Fenton reagent at 30 °C for 10 days, and 92.28% retaining of original ionic conductivity after immersion in 1 M NaOH solution at 60 °C for 30 days), which are greater than those of semi-interpenetrating polymer network QPS4VP/PQ-10 AEM. In summary, a combination of fully-interpenetrating polymer network and stable polymer chains and ion-conducting moieties is found to effectively overcome the trade-off between high ionic conductivity and good dimensional/chemical stabilities.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 10
·1-11
·
IF 6.408
Deng Gaoqiong,Chen Hengye,Shi Qiong,Ren Lixue,Liang Ke,Long Wanjun,Lan Wei,Han Xiaole,She Yuanbin,Fu Haiyan
A simple and sensitive colorimetric assay for detecting organophosphorus pesticides (OPs) was developed based on 3,3',5,5' -tetramethylbenzidine (TMB)/hydrogen peroxide (H 2 O 2 )/dodecyl trimethylammonium bromide (DTAB)-tetramethyl zinc (4-pyridinyl) porphyrin (ZnTPyP). In this system, based on the peroxidase-like activity of DTAB-ZnTPyP, H 2 O 2 decomposes to produce hydroxyl radicals, which oxidize TMB, resulting in blue oxidation products. The OPs (trichlorfon, dichlorvos, and thimet) were first combined with DTAB-ZnTPyP through electrostatic interactions. The OPs caused a decrease in the peroxidase-like activity of DTAB-ZnTPyP due to spatial site blocking. At the same time, π-interactions occurred between them, and these interactions also inhibited the oxidation of TMB (652 nm), thus making the detection of OPs possible. The limits of detection for trichlorfon, dichlorvos, and thimet were 0.25, 1.02, and 0.66 μg/L, respectively, and the corresponding linear ranges were 1–35, 5–45, and 1–40 μg/L, respectively. Moreover, the assay was successfully used to determine OPs in cabbage, apple, soil, and traditional Chinese medicine samples (the recovery ratios were 91.8–109.8%), showing a great promising potential for detecting OPs also in other complex samples.
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ENVIRONMENTAL TECHNOLOGY
·
2022
·
IF 3.475
Dairui Xie,Hao Huang,Heng Zhang,Fang Shen,Meng Jiang,Xiaoting Li,Hongyan Shang,Jun Ma,Shilin Zhao
The amphiphilic humic acid ester ether (HAEE), as a kind of solid-phase extractant with characteristics of easy separation and hydrophilic–hydrophobic amphiphilic property, was prepared and used to extract micro or trace nitrofen, 2,4-dichlorophenol and p-nitrotrophenol (NIPs) from water and soil. Degradation of NIPs and extractant regeneration were carried out by simple photocatalysis. The adsorption equilibrium of the mono- or three mixed NIPs by HAEE in aqueous could be quickly reached within 20 min. The adsorption process was fit to quasi-second-order kinetics model and Friendlich thermodynamics model. The possible adsorption interaction was discussed. Results suggested that the adsorption of NIPs onto HAEE predominated by hydrogen bonding, hydrophobic interaction and π-π interaction. The extraction capacity of mixed NIPs (80 μg/L each component) by HAEE was up to 0.38 mg/g and tended to be multi-layer adsorption, in which p-nitrotrophenol had higher adsorption competitiveness because of lower resistance to HAEE. When HAEE-NIPs were degraded by photo-catalyst Fe0/F-TiO2 for 8 h, not only the adsorbed NIPs could be totally degraded and mineralized, but also the HAEE could be effectively regenerated. When the NIPs were continuously extracted from 40-year aging soil for three times (regenerative twice) by combined extractant (48 mL H2O + 2 mL n-hexane + 0.1 g HAEE), the total extraction efficiency of NIPs could reach to 84.66%. This research could supplement the theory and technique for harmless treatment of NIPs contaminated water and soil.
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MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-10
·
IF 6.408
Wang Yuexin,Chen Rui,Shen Bo,Li Cai,Chen Junman,Wang Yanshuang,Tian Shen,Li Xuemiao,Luo Nini,Liu Rui,Ding Shijia,Zhu Chuanlong,Xia Qianfeng
A multifunctional catalytic nanomaterial (Co-MOF@AuNP@ABEI) composed of cobalt-doped metal–organic frameworks (Co-MOF), gold nanoparticles (AuNP), and N -(4-aminobutyl)- N -(ethylisoluminol) (ABEI) is reported. Co-MOF@AuNP@ABEI exhibits high synergistic and zero-distance catalytic properties, which are beneficial to the improvement of the detection sensitivity of an electrochemiluminescent (ECL) biosensor. After coupling with the ECL system and 3D magnetic walking nanomachine amplification strategy, the Co-MOF@AuNP@ABEI can achieve an ultrasensitive ECL assay of Burkholderia pseudomallei with the limit of detection (LOD) of 60.3 aM, which is 2 and 4 orders of magnitude lower than individual ECL system without the nanomachine (4.97 fM) and individual walking nanomachine (340 fM), and superior to the pathogenic bacteria analyses in the previous report. Moreover, the LOD of the proposed ECL detection system for the determination of B. pseudomallei in serum sample was as low as 9.0 CFU mL −1 . The relative standard deviations (RSD) of ECL intensity for the detection of five B. pseudomallei -spiked serum samples were 4.02%, 0.84%, 0.84%, 1.55%, and 0.21%, respectively. The recoveries of the ECL biosensor for the detection of B. pseudomallei DNA-spiked serum samples were 93.63 ~ 107.83%. Therefore, this work demonstrated that the developed multifunctional catalytic nanomaterial with synergistic and zero-distance catalytic properties can be used as excellent ECL signal reporter to improve the detection sensitivity of ECL biosensor. Graphical abstract
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Jie Liu,Ziqian Wang,Qiuliang Wang,Kailai Zhang,Yali Luo,Yunfei Liu,Yinong Lyu,Bei Huang
Porous carbon with abundant nitrogen doping (C-PCTF) was obtained by using porphyrin-based covalent triazine framework (PCTF) as the carbonization precursor. As expected, C-PCTF inherits the porous structure and the chemical composition of the PCTF . Due to the high surface area and accessible nitrogen sites, the carbon material can be employed as a superior supporting substrate to immobilize Au and Ag nanoparticles . Both the Au@C-PCTF and Ag@C-PCTF nanocatalysts show good catalytic activity in the reduction of 4-nitrophenol. Especially for Ag@C-PCTF, the catalytic activity is higher than most of other metal-catalysts reported previously. This study would provide a new strategy to use various porous organic polymers in fabricating carbon-supported heterogeneous catalysts.
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Inorganic Chemistry Frontiers
·
2021
·Vol. 8
·期 22
·4903-4913
·
IF 6.569
Yufeng Yao,Jiayi Yuan,Ming Shen,Bin Du
In this study, hexylresorcinol calix[4]arene-ZnO-Au (HRCA-ZnO-Au) micro–nano materials are synthesized by a simple atmospheric reflux. AuCl4− ions are in situ reduced to Au by the phenolic hydroxyl groups of amphiphilic HRCA and deposited on the primarily formed ZnO sheets, which prevents Zn2+ ions in the solution from depositing at this position. Finally, the flake sample is obtained. HRCA and chloroauric acid effectively shape the morphology of ZnO from micron-sized flowers to nanometer sheets, and they significantly increase the specific surface area of the sample. Low temperature calcination of the HRCA-ZnO-Au composite micro–nano materials partially removes calixarene molecules and exposes the surface of ZnO–Au. Thus, the photocatalytic activity of ZnO–Au is significantly improved due to the synergistic effect between ZnO and Au.
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危险品化学品经营许可证（带存储）