Advanced Composites and Hybrid Materials
·
2021
·Vol. 5
·期 1
·91-103
·
IF 5.693
Zhu Tengyang,Zhao Xiaoxu,Yi Ming,Xu Sheng,Wang Yan
To eliminate the interfacial defects between polymeric matrix and inorganic fillers in hybrid membranes, various strategies have been proposed by modifying membrane materials or optimizing membrane formation process. In this work, a ternary cross-linked PVA-APTES-ZIF-90 (PVA, poly(vinyl alcohol); APTES, 3-aminopropyltriethoxysilane; ZIF-90, zeolitic imidazolate framework-90) membrane was developed to eliminate interfacial defects between PVA and ZIF-90 for enhanced ethanol dehydration performance, where APTES served as a covalently linked bridge to cross-link PVA and ZIF-90 simultaneously. The morphologies and physicochemical properties of the resultant membranes were characterized by various characterization techniques. Moreover, we also explored the effects of [ZIF-90]/[APTES] mole ratio and [ZIF-90]/[APTES] loading on the separation performance of the trinity membranes. The results indicated that ZIF-90 particles showed better dispersion and compatibility in PVA-APTES-ZIF-90 trinity membranes than in PVA/ZIF-90 hybrid membrane, attributed to the ternary cross-linking among PVA, APTES, and ZIF-90. Compared with pristine PVA membrane, PVA-APTES-ZIF-90 trinity membranes showed stronger anti-swelling and mechanical properties, as well as more excellent separation performance, which resulted from the incorporation of cross-linker APTES and ZIF-90 particles. The separation factor of the optimal PVA-APTES-ZIF-90 trinity membrane was improved by 215.4%, up to 552, accompanied by a total flux of 82 g/m 2 h. Ternary cross-linking among cross-linker, inorganic filler, and polymeric chain is therefore believed to be a feasible strategy in preparing polymeric-based hybrid membranes with high separation performance. Graphical abstract Summary: A novel ternary cross-linked hybrid membrane with APTES as co-cross-linkers of ZIF-90 and PVA for efficient ethanol dehydration
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 5
·1541-1553
·
IF 2.647
Zeng Laiyuan,Wei Xuefeng,Miao Juan,Zhang Ruichang,Zhang Jun,Zhou Ming,Lu Weiwei
A Sb-doped SnO 2 anode modified with Ni and B was fabricated by the sol–gel method. The effect of major operation parameters of electrode preparation, such as Ni content, B content, and calcination temperature, on the mineralization degree of phenol was investigated. Response surface methodology was used to optimize the experimental conditions and evaluate the association between various operation parameters. The morphology, crystal structure, and electrocatalytic performance of the prepared SnO 2 –Sb–Ni–B anodes were studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), linear sweep voltammetry (LSV), and cyclic voltammetry (CV). The optimized sol–gel preparation ratio of citric acid, ethylene glycol, tin tetrachloride, antimony trichloride, nickel chloride, and boric acid was 650:200:100:6.5:0.5:2, and the calcination temperature of the electrode was 550 °C. The SnO 2 –Sb–Ni–B anode has the highest oxygen evolution potential of 1.63 V (vs. Hg 2 /Hg 2 SO 4 ). The removal degree of phenol reached 58% within 2 h on the SnO 2 –Sb–Ni–B anode. The accelerated lifetime of the selected SnO 2 –Ni–B anode was 720 min, which was carried out in a 3-mol/L sulfuric acid solution with a current density of 500 mA/cm 2 .
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CELLULOSE
·
2021
·Vol. 28
·期 6
·3647-3662
·
IF 5.044
Yang Junjie,Yao Jintong,Ma Yingying
Biological gel paper actuators (BGPAs) constitute a rising class of electroactive smart artificial muscles with the advantages of large deformation and high energy density at low cost, and they are extensively used in areas such as soft robots, aerospace applications, and biomedical engineering. In this study, a double-side casting process and evaluation methods were proposed for manufacturing electroactive BGPAs and testing their output force characteristics. Furthermore, the effect and optimization mechanism of the double-side casting temperature on the output force performance and electrically activated mechanochemical behavior of a BGPA were studied in depth under single-cycle and repeated work periods. The experimental results demonstrated that when the casting temperature was 50 °C, various hydrogel membranes of BGPAs had optimal connections, with a penetration thickness of 6 μm, which reduced the interfacial contact resistance and drastically increased the quantity of interlayer hydrated ions. Moreover, the specific capacitance of this BGPA reached a maximum at 551.34 mF/g, but its elastic modulus, internal resistance and water loss rate all reached minimum values of 5.934 MPa, 1.91 Ω and 0.176%, respectively. Hence, the ideal values of the working life and output force density were similarly obtained for the BGPA, which were 891 s and 16.249 mN/g, respectively. In general, this optimized high-performance BGPA holds great value for the development and validation of natural smart polymers and engineering solutions. Graphic abstract
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RARE METALS
·
2021
·Vol. 40
·期 9
·2538-2551
·
IF 4.003
Han Zhi-Xin,Liu Xiang-Mei,Tan Lei,Li Zhao-Yang,Zheng Yu-Feng,Yeung Kelvin Wai-Kwok,Cui Zhen-Duo,Liang Yan-Qin,Zhu Sheng-Li,Wu Shui-Lin
Abstract Controlling the corrosion rate is critical for practical applications of Mg-based alloys. In this work, we constructed a protective coating of hybrid polycaprolactone (H-PCL)/indocyanine green (ICG) on AZ31 Mg alloy, whose degradation rate was controlled by 808-nm near-infrared (NIR) light irradiation. The corrosion behaviors of H-PCL/ICG coated Mg alloys were systematically investigated by potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) and hydrogen evolution experiments. The results disclosed that the H-PCL/ICG composite coating could effectively protect Mg alloy from corroding without NIR light irradiation. In contrast, under 808-nm NIR light irradiation, the corrosion resistance of this composite coating was decreased significantly, i.e., the corrosion current density ( i corr ) increased from (8.81 ± 1.068) × 10 −8 to (1.22 ± 0.545) × 10 −6 A·cm −2 . This is because the component of ICG in the coating was excited to produce heat locally, which triggered the glass transition temperature ( T g ) of H-PCL in the coating, resulting in the motion of the molecular chain segment. Consequently, the electrolytes penetrated the coating and corroded the Mg substrate. In vitro biological experiment indicated that the synthesized coating exhibited good cytocompatibility. Hence, these findings will provide a new strategy for designing novel photoresponsive coatings to remotely adjust the degradation rate of biodegradable metals for biomedical applications. Graphic abstract
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Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-11
·
IF 4.703
Li Zihaoran,Wu Xinghan,Wang Wenyu,Gai Chengcheng,Zhang Weifen,Li Wentong,Ding Dejun
Suppression of tumor development by inducing ferroptosis may provide a potential remedy for triple-negative breast cancer, which is sensitive to intracellular oxidative imbalance. Recently, artemisinin (ART) and its derivatives have been investigated as potential anticancer agents for the treatment of highly aggressive cancers via the induction of ferroptosis by iron-mediated cleavage of the endoperoxide bridge. Owing to its poor water solubility and limited intracellular iron content, it is challenging for further application in antitumor therapy. Herein, we developed ferrous-supply nano-carrier for ART based on tannic acid (TA) and ferrous ion (Fe(II)) coated on the zeolitic imidazolate framework-8 (ZIF) with ART encapsulated (TA-Fe/ART@ZIF) via coordination-driven self-assembly. Drug release experiments showed that ART was not nearly released in pH 7.4, while 59% ART was released in pH 5.0 after 10 h, demonstrating the excellent pH-triggered release. Meanwhile, a high level of intracellular ROS and MDA, accompanied with decreasing GSH and GPX4, displayed a newly developed nano-drug system displayed markedly enhanced ferroptosis. Compared with monotherapy, in vitro and vivo tumor inhibition experiments demonstrated higher efficiency of tumor suppression of TA-Fe/ART@ZIF. This work provides a novel approach to enhance the potency of ferroptotic nano-medicine and new directions for TBNC therapy.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 11
·6414-6425
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IF 1.938
Fan Wentao,Du Yongqiang,Zhou Jianjun,Ma Xueqing,Liu Yingliang,Xu Shengang,Cao Shaokui
The introduction of polymer additives provides a simple effective method to modify perovskite grain boundaries to improve power conversion efficiency (PCE) and stability of perovskite solar cells (PSCs). In this work, the high-quality methylammonium lead triiodide (MAPbI 3 ) perovskite film is prepared by adding the protonated polyamide-amine dendrimer (NH 3 + -PAMAM) to the perovskite precursor solution to regulate the crystalline growth process. The cross-linked perovskite grain structure induced by dendritic NH 3 + -functionalized PAMAM macromolecules results in the formation of compact and pinhole-free perovskite film owing to the suppression of perovskite gain boundaries. Finally, the unsealed NH 3 + -PAMAM modified PSC device achieves the highest PCE value of 16.03%, representing an increase of 48% compared with the control PSC device. Also, the unencapsulated NH 3 + -PAMAM-modified PSC device retained 75% of initial PCE value after being exposed to an ambient environment for 20 days, which is obviously higher than 10% for the control device. The improvements of perovskite morphology and photovoltaic performance are attributed to the modification of NH 3 + -PAMAM dendrimers. Graphic abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 4
·5043-5051
·
IF 4.223
Xu
Jing,Wu Yi,Ma Mengling,Luo Tao,Xia Jun,Zhang Xiang
Iron species that occur in natural surface water could affect the photochemical behavior of pollutants. Complexation between iron species and polycarboxylate or heavy metals has been widely reported, where the ligands could be oxidized via ligand-to-metal charge transfer (LMCT) by light inducement. Such complexation and photochemical reactions might also occur for low valance metal-containing organic compounds, which is worthy of investigation. This work studied the phototransformation of p -arsanilic acid (ASA), an organic arsenic compound that is widely used as a feed additive in the poultry industry, by colloidal ferric hydroxide (CFH) using black light lamps ( λ = 365 nm) as the light source. The results revealed the contribution to ASA transformation at circumneutral conditions by CFH through an LMCT process, which is the same as that for As(III). The complexation between ASA and CFH was investigated using UV–vis spectroscopy. The estimated equilibrium constant for the CFH–ASA complex was log K f271 = 4.22. The analysis of the photoproducts found the generation of both inorganic and organic arsenic. Our findings confirmed the similarities in the photochemical mechanisms of ASA and As(III) in the presence of CFH. The results help in further understanding the fate of organoarsenicals in the surface water environment.
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Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 4
·832-842
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IF 6.707
Du Bin,Cai Mei,Wang Xuan,Qian Junjie,He Chao,Shui Anze
Nowadays, metal oxide-based electromagnetic wave absorbing materials have aroused widely attentions in the application of telecommunication and electronics due to their selectable mechanical and outstanding dielectric properties. Herein, the binary ZnO/NiCo 2 O 4 nanoparticles were successfully synthesized via hydrothermal reaction and the electromagnetic wave absorption properties of the composites were investigated in detail. As a result, benefiting from the dielectric loss, the as-obtained ZnO/NiCo 2 O 4 -7 samples possessed a minimum reflection loss value of −33.49 dB at 18.0 GHz with the thickness of 4.99 mm. This work indicates that ZnO/NiCo 2 O 4 composites have the promising candidate applications in electromagnetic wave absorption materials in the future.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 28
·期 34
·47099-47106
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IF 4.223
Jiang Wenqi,Yao Guojun,Jing Xu,Liu Xueke,Liu Donghui,Zhou Zhiqiang
Heavy metals may coexist with pesticides in farmland through wastewater irrigation, application of pesticides and chemical fertilizers, or unappropriated waste disposal. Heavy metals are toxic to soil microorganism, which may influence the environmental behavior of pesticides subsequently. In this study, the influence of Cd 2+ and Pb 2+ on the degradation of α-cypermethrin and its metabolites, 3-phenoxphenoxybenzoic acid (3-PBA) and 3-(2’,2’-dichlorovinyl)-2,2-dimethylcyclopropane carboxylic acid (DCCA), were investigated through soil incubation experiment. It was found heavy metals like Cd 2+ and Pb 2+ will inhibit the degradation of α-cypermethrin, especially at high concentrations. Pb 2+ has a stronger inhibitory effect on the degradation of α-cypermethrin than Cd 2+ in the same concentration. With the presence of 10 mg/kg Pb 2+ , the half-life of α-cypermethrin increased from 41.1 to 99.9 days, even the half-life was 129.3 days with 50 mg/kg of Pb 2+ . Besides, heavy metals influenced the chiral selective degradation of α-cypermethrin. The enantiomer fraction was near 0.5 when 10 mg/kg of heavy metals existed. Furthermore, the adverse effects of heavy metals on soil urease, catalase, and sucrase activity were assayed. In tested concentrations (10 and 50 mg kg -1 ), the heavy metals result in strong inhibition of the activity of the enzymes present on soil, jeopardizing the biodegradation by the microbiome and which may inhibit the degradation of α-cypermethrin.
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高影响因子
BMC Chemistry
·
2021
·Vol. 15
·期 1
·1-11
·
IF 2.61
Senan Ahmed M.,Yin Binru,Zhang Yaoyao,Nasiru Mustapha M.,Lyu Yong‐Mei,Umair Muhammad,Bhat Javaid A.,Zhang Sicheng,Liu Li
With the increasing demand for antimicrobial agents and the spread of antibiotic resistance in pathogens, the exploitation of plant oils to partly replace antibiotic emerges as an important source of fine chemicals, functional food utility and pharmaceutical industries. This work introduces a novel catalytic method of plant oils hydroxylation by Fe(III) citrate monohydrate (Fe 3+ -cit.)/Na 2 S 2 O 8 catalyst. Methyl (9 Z ,12 Z )-octadecadienoate (ML) was selected as an example of vegetable oils hydroxylation to its hydroxy-conjugated derivatives (CHML) in the presence of a new complex of Fe(II)-species. Methyl 9,12-di-hydroxyoctadecanoate 1 , methyl-9-hydroxyoctadecanoate 2 and methyl (10 E ,12 E )-octadecanoate 3 mixtures is produced under optimized condition with oxygen balloon. The specific hydroxylation activity was lower in the case of using Na 2 S 2 O 8 alone as a catalyst. A chemical reaction has shown the main process converted of plantoils hydroxylation and (+ 16 Da) of OH- attached at the methyl linoleate (ML-OH). HPLC and MALDI-ToF-mass spectrometry were employed for determining the obtained products. It was found that adding oxidizing agents (Na 2 S 2 O 8 ) to Fe 3+ in the MeCN mixture with H 2 O would generate the new complex of Fe(II)-species, which improves the C-H activation. Hence, the present study demonstrated a new functional method for better usage of vegetable oils.Producing conjugated hydroxy-fatty acids/esters with better antipathogenic properties. CHML used in food industry, It has a potential pathway to food safety and packaging process with good advantages, fundamental to microbial resistance. Lastly, our findings showed that biological monitoring of CHML-minimum inhibitory concentration (MIC) inhibited growth of various gram-positive and gram-negative bacteria in vitro study. The produced CHML profiles were comparable to the corresponding to previousstudies and showed improved the inhibition efficiency over the respective kanamycin derivatives.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 19
·4887-4894
·
IF 4.157
Zhang Luwei,Xin Fuli,Cai Zhixiong,Zhao Hong,Zhang Xiaolong,Yao Cuiping
Azodicarbonamide (ADA), as a dough conditioner food additive in flour, can be turned into toxic biurea and semicarbazide after high temperature processing. Hence, the using of ADA in food material should be strictly controlled, and the detection of ADA is very important for consumers’ safety and health. Herein, a simple and fast colorimetric strategy has been developed for ADA detection based on the MnO 2 nanosheets-3,3′,5,5′-tetramethylbenzidine (TMB)-glutathione (GSH) as oxidative sensing system (MnO 2 -TMB-GSH). Since the ADA can selectively react with GSH via oxidizing the sulfydryl (-SH) group of GSH to disulfide bond (S-S), which makes GSH unable to reduce MnO 2 nanosheets and restore its oxidase-like activity. The absorbance changes of the TMB solution depended on ADA content. The MnO 2 -TMB-GSH colorimetric platform can detect the ADA with a linear range of 10 μmol L −1 (11.6 ppm) to 400 μmol L −1 (464 ppm), and the limit of detection (LOD) is 3.3 μmol L −1 (3.51 ppm). Some potential interferences in real sample were tested and did not affect the MnO 2 -TMB-GSH colorimetric platform for ADA detection. Furthermore, the sensing platform was applied for detecting ADA in real flour sample with a recovery of 96%–105% (RSD < 5%). This colorimetric method can effectively and rapidly detect ADA additives in flour less than the prescribed standard (45 mg kg −1 ), which shows a great potential for visualization analysis and on-site detection of ADA in flour. Graphical abstract
A simple and fast colorimetric strategy has been developed for azodicarbonamide (ADA) detection based on the MnO 2 nanosheets-3,3′,5,5′-tetramethylbenzidine (TMB)-glutathione (GSH) as oxidative sensing system (MnO 2 -TMB-GSH).
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Journal of Central South University
·
2021
·Vol. 28
·期 4
·1233-1243
·
IF 1.716
Rao Wei-dong,Liu Yao,Cheng Li-jing,Liu Shao-jun
Combining sintering additive with field assisted sintering, stereolithographical dense Si 3 N 4 ceramics was successfully fabricated. Owing to a large amount of polymer during the stereolithography, the green parts have the characteristics of low powder loading and high porosity. Adjusting the process parameters such as sintering temperature and soaking time can effectively improve the density of the specimens. The stress exponent n of all specimens is in a range of 1 and 2, which is derived from a modified sintering kinetics model. The apparent activation energy Q d of stereolithographic Si 3 N 4 ceramics sintered with applied pressures of 30 MPa, 40 MPa, and 50 MPa is 384.75, 276.61 and 193.95 kJ/mol, respectively, suggesting that the densification dynamic process is strengthened by raising applied pressure. The grain boundary slipping plays a dominating role in the densification of stereolithographic Si 3 N 4 ceramics. The Vickers hardness and fracture toughness of stereolithographic Si 3 N 4 ceramics are HV10/10 (1347.9±2.4) and (6.57±0.07) MPa·m 1/2 , respectively.
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危险品化学品经营许可证（带存储）