TALANTA
·
2022
·
IF 6.556
Jingyu Li,Yexin Dai,Jinran Cui,Halayit Abrha,Ning Kang,Xianhua Liu
Overuse of antibiotics posed a global threat to human health and the ecological environment. Efficient detection and control of antibiotic pollution demand novel sensory materials. Here, a dual-luminescent material FS@UIO66 was successfully synthesized by encapsulating fluorescent molecules (fluorescein sodium , FS) in UIO66 based on the in-situ encapsulation method. We found that the dual emission peaks of FS@UIO66 at 369 and 515 nm can be sensitively and synchronously quenched by tetracycline (TET). Interestingly, these two peak intensities were switched anisotropically by levofloxacin (LEV), in which the signal at 515 nm was enhanced. Photophysical analysis revealed that there may exist a competition and replenishment mechanism in the sensing processes. The ratiometric fluorescent feature was employed for rapid detection of TET and LEV, with detection limits of 0.2444 μM and 0.2808 μM for TET and LEV, respectively. The superior sensitivity, high selectivity, and excellent recyclability of FS@UIO66 in sensing TET and LEV were demonstrated in this work. In addition, TET and LEV were also successfully detected by FS@UIO66 in water from real water environment. The results indicate that FS@UIO66 composites are favorable for TET and LEV detection, presenting a great sensing platform for antibiotic detection.
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高影响因子
JOURNAL OF MOLECULAR GRAPHICS & MODELLING
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2022
·
IF 2.942
Qiu Bao,Jingzhi Xu,Wen Nie,Wenjin Niu,Qifan Tian,Mingyue Yuan
In this paper, the head group, tail group, and main chain of a single type of surfactant were constructed by a mesoscopic simulation, and the interaction between the simulated surfactant and coal dust both on its own and in a composite with polyacrylamide (PAM) was studied. The molecular adsorption behavior of cetyltrimethylammonium chloride (CTAC) surfactant mixed in different ratios with PAM was also experimentally characterized. The results showed that . From the above results, we can see that CTAC and PAM can form spherical, rod-shaped, and wormlike aggregates and a network structure as their volume fraction increases in an aqueous solution. The energy spectrum showed that when CTAC adsorbed on the surface of the coal, the content of carbon on the surface decreased from 63.8 to 50.4%, and the content of oxygen increased from 35.2 to 41.8%. The study on the adsorption mechanism of surfactants and polymers on the surface of low rank coal and the hydrophilicity of low rank coal is of great significance in developing efficient dust prevention technology for low rank coal to reduce coal dust pollution.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Guofeng Qiu,Zekai Miao,Yang Guo,Jie Xu,Wenke Jia,Yixin Zhang,Fanhui Guo,Jianjun Wu
Bamboo shavings hierarchical porous carbon (BPC) possesses excellent prospects for applications in supercapacitors . Herein, the formation mechanism of the hierarchical porous structure of BPC is systematically investigated in an attempt to clarify the role of three components (cellulose, hemicellulose , and lignin) in bamboo shavings on the pore structure and electrochemical properties of BPC. An efficient three-component separation method of bamboo shavings is proposed. We adopt a green activation strategy of CO 2 -catalyzed induction of small doses of K 2 CO 3 to prepare bamboo shavings and their different components into honeycomb-like hierarchical porous carbons with excellent supercapacitor performance . The findings demonstrate that cellulose and hemicellulose mainly provide the microporous structure for BPC. Lignin provides not only a large number of mesopores but also abundant micropores. Compared with porous carbon derived from other components, lignin-derived porous carbon exhibits the optimal specific capacitance (273 Fg −1 at 0.5 Ag −1 ) and rate performance (capacity retention of 82.6% at 20 Ag −1 ) attributed to the largest specific surface area (1985 m 2 g −1 ) and micro-mesopore volume, indicating that lignin provides an important guarantee for the excellent specific capacitance and rate performance of BPC. The cellulose-derived porous carbon demonstrates superior cycling stability (98.2% capacitance retention over 15,000 cycles) due to its extraordinary electrical conductivity and stable carbon backbone, which means that cellulose is essential to the outstanding cycling stability of the BPC. Furthermore, the existence of hemicellulose also promotes the electrochemical performance of BPC to some extent. With the combined action of lignin, cellulose and hemicellulose, the BPC demonstrates excellent electrochemical properties. This work provides a promising ideas for the subsequent adjustment of pore structure and optimization of electrochemical properties of biomass-derived carbon by adjusting the content of each component in biomass.
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TALANTA
·
2022
·
IF 6.556
Li Zhan,Chengyuan Liu,Keke Qi,Liutian Wu,Ying Xiong,Xuan Zhang,Jianye Zang,Yang Pan
In this work, endogenous metabolites in mouse brain tissue were imaged by negative desorption electrospray ionization (DESI), ammonia assisted DESI (aa-DESI), DESI/post-photoionization (DESI/PI), and ammonia assisted DESI/PI (aa-DESI/PI) mass spectrometry imaging (MSI) strategies. The combined effect of ammonia additive and post-photoionization was found to play an important role in the enhancement of sensitivity and coverage for endogenous analytes under ambient conditions. Compared with DESI, aa-DESI/PI can provide increased signal intensities for metabolites up to 37.1-fold, as well as the imaging of nine more small metabolites ( m/z < 350) (26 for aa-DESI/PI and 17 for DESI) in mouse brain tissue. The results of Pearson correlation analysis and KEGG pathway analysis showed that the enhanced imaging strategy of aa-DESI/PI can facilitate the study of endogenous metabolic pathways and molecular networks. Moreover, the imaging results of mouse tumor tissue demonstrated the promising application of aa-DESI/PI in tumor research.
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HIGH PERFORMANCE POLYMERS
·
2022
·
IF 1.73
Xiankun Wu,Chang-an Xu,Mangeng Lu,Xiaole Zheng,Yingjie Zhan,Bifang Chen,Kunxin Wang,Huifa Meng
To explore thermal and mechanical properties of epoxy material, difunctional aromatic epoxy--divinylbenzene dioxide (DVBDO) had been synthesized by epoxidizing divinylbenzene, using the metal acetylacetone compound grafted Fe3O4 particles as the catalyst. The catalyet had high conversion and epoxy selectivity and could be recyclable. Then the polymerization of DVBDO with different diamine curing agents were reported. The structure and viscosity of DVBDO were firstly characterized. Because it had low molecular weight and viscosity, DVBDO had excellent liquidity and formability. Subsequently to clarify the properties of epoxy thermosets, experiments to determine thermal and mechanical performances were carried out, such as differential scanning calorimetry (DSC), thermal gravimetric (TGA), dynamic mechanical analysis (DMA) and tensile test. It could be observed that the thermoset polymers using DVBDO as epoxy matrix had excellent thermal (Tg was about 201°C) and mechanical properties (tensile strength was 131.99Mpa). Possibly considering that this kind of thermoset polymers had higher rigidity and crosslink density. In conclusion, a new type of one-component liquid epoxy encapsulant material with low viscosity, good filling fluidity, strong heat resistance and excellent storage performance had been developed.
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SURFACE & COATINGS TECHNOLOGY
·
2022
·
IF 4.865
Xiuhu Li,Rongrong Deng,Qibo Zhang
Cobalt-phosphorous (Co P) coatings are promising alternatives for hard chromium due to their outstanding corrosion protection . An excellent Co P coating can efficiently reduce the effects of a corrosive environment. Herein, Co P coatings with a tunable P content, ranging from 5.1 at.% to 20 at.%, are fabricated via a simple electrochemical deposition approach from choline chloride-ethylene glycol (Ethaline)-based deep eutectic solvent (DES) with saccharin (SA) as an additive. The rational introduction of SA induced the formation of close-growing Co P coatings rich in P on the substrate with reduced grain size and surface roughness . It turned out that the crystal structure of the deposited Co P coatings changed from a crystallized state to an amorphous state upon the addition of SA, which accelerated the nucleation rate of the nanocrystals and modified the nucleation model from progressive to instantaneous. The optimal Co P coating prepared exhibited excellent anti-corrosion and barrier protection properties for mild steel in corrosive NaCl solution, functioning up to 10 times better than its counterparts. Our work reveals the central role of additives in tailoring the structure and composition of the deposited Co P coatings in Ethaline-based DES and offers a new avenue for fabricating high-performance coating materials for anti-corrosion applications.
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ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2206053
·
IF 19.924
Zhi Zhang,Ziming Xiong,Yao Yao,Derong Wang,Zhiqian Yang,Pin Zhang,Qing Zhao,Wenke Zhou
Electronic devices have brought huge convenience to daily lives; however, a large amount of electromagnetic radiation pollution is generated. Therefore, an urgent demand for electromagnetic wave absorbing materials featuring “low thickness, wide frequency band and strong absorption” is put forward. Here, a strategy of introducing a conductive carbon nanotubes (CNTs) network into CH 3 NH 3 PbI 3 (MAPbI 3 ) is developed to construct an electromagnetic wave absorbing system. As the absorption center, MAPbI 3 dominates the absorption band via an electric polarization process. Meanwhile, the CNTs construct an efficient conductive network, which supply a transmission path for free electrons inside the MAPbI 3 crystals and enhance conduction loss. In comparison with the insulated network formed by MoO 3 /MAPbI 3 , it is speculated that the broadened absorption bandwidth and reduced absorption thickness originate from the conductive network of CNTs. As a result, when the CNTs is 7.7% (mass ratio), the reflection loss strength of MAPbI 3 /CNTs reaches −57.71 dB at 13.96 GHz and the corresponding effective absorption bandwidth is 6.32 GHz (11.68–18.00 GHz), with an absorber thickness of 1.96 mm. The method of constructing conductive network proves a great potential of hybrid perovskite in the field of electromagnetic wave absorption and provides feasible strategies for the absorption regulation of dielectric loss-type materials.
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Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 33
·11931-11937
·
IF 8.067
Hong Zhu,Yuexiao Pan,Hongzhou Lian,Jun Lin
Bulk zero-dimensional (0D) rhombohedral perovskite Cs4PbBr6 crystals grown into microsized ones exhibit bright green photoluminescence (PL) ranging from 510 to 530 nm and have attracted much attention due to their potential applications in photovoltaic and white light-emitting diodes (WLEDs). Here, we report blue luminescence of Cs4PbBr6 nanosized crystals (NCs) (∼3 nm) at 467 nm in highly volatile acetone (CP) solution in the presence of organic amines with carbon chain lengths ranging from 4C to 8C at room temperature. Subsequently, the Cs4PbBr6 NCs gradually grew into microsized crystals (MCs) (∼2 μm) and the emission wavelength shifts to 515 nm within 40–100 min. This is attributed to the evaporation of organic amines along with CP on the surfaces of Cs4PbBr6 crystals. The final grown Cs4PbBr6 MCs are free of any ligands with photoluminescence quantum yields (PLQYs) up to 93.3% and show a superior moisture resistance. The spontaneous growth of ligand-free Cs4PbBr6 crystals spans from the nanometer to the micrometer scale and causes changes in quantum confinement for fundamental new insights into the crystal growth dynamics of the perovskites and exhibits promising applications in WLEDs.
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Materials
·
2022
·Vol. 15
·期 12
·4149
·
IF 3.748
Yinghui Wang,Xiurong Guo,Danfeng Du,Shaochi Yang
Perovskite-type catalysts were widely used in the field of automobile exhaust purification due to their inherent physicochemical properties and excellent doping characteristics. A series of La1−xMxCo1−yNyO3(M = Ce, Ca; N = Fe, Mn) perovskite-type catalyst samples were prepared by sol-gel method for the four-way purification of PM, NOx, CO, and HC emitted by diesel exhaust. The activity of catalyst samples was tested by simulation experiments and hydrogen temperature-programmed reduction (H2-TPR). Catalyst samples were characterized by means of XRD, FT-IR, SEM, BET, and XPS analysis. The results demonstrated that the perovskite-type catalyst samples with a particle pore size of 3–5 μm can be prepared by sol-gel method. When A-site of LaCoO3perovskite-type oxide was doped by cerium ions, the catalyst samples produced small distortion. The doping of cerium ions to A-site was more conducive to the four-way purification of diesel exhaust than calcium ions. La0.8Ce0.2CoO3perovskite-type samples showed the best purification efficiency, and the purification efficiencies of PM, NOx, CO, and HC were 90%, 85%, 94%, and 100%, respectively. When the B-site of La0.8Ce0.2CoO3perovskite was doped with iron ions, the purification efficiency of catalyst samples for PM and NOxcan be further enhanced. When the B-site of La0.8Ce0.2CoO3perovskite was doped with manganese ions, the purification efficiency of the catalyst samples for PM can be further enhanced. It can be seen from the simulation experiments that La0.8Ce0.2Co0.7Fe0.3O3perovskite was the best doping amount, and the purification efficiencies of PM, NOx, CO, and HC were 95%, 92%, 94%, and 100%, respectively.Keywords:perovskite-type catalyst;diesel exhaust;sol-gel method;four-way purification;doping amount
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APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chenghao Zhang,Chun Li,Zongjing He,Dejun Gao,Junlei Qi,Jian Cao
Multi-level hierarchical surface roughness is the key to natural superhydrophobic materials. In this work, rough surfaces of a novel superhydrophobic material are achieved by the reactive wetting technique. The molten AgCuTi alloy is applied to infiltrate into the porous anodic aluminum oxide (AAO) membrane, and wetting of molten AgCuTi is promoted by the reaction layer formed at the interface between AAO and AgCuTi. The AgCuTi infiltrates the AAO nanopores and forms the first-level surface roughness based on reactive wetting. To release the nanostructures embedded in the AAO pores, hydrothermal etching with NaOH aqueous solution was used to remove AAO. Meanwhile, TiO 2 nanostructures are synthesized under hydrothermal conditions, resulting in the second-level surface roughness. After modification, the surface is found to exhibit excellent superhydrophobic properties, including a high water contact angle (WCA) and low roll-off angle (RA). The superhydrophobic surface also shows self-cleaning, mechanical durability and long-term stability. The as-prepared surface exhibits excellent repellence for water solutions with different pH values. This method could be applied to fabricate superhydrophobic surfaces on different kinds of materials, showing broad application prospects.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 39
·e52943
·
IF 3.057
Congyang Ma,Sheng Wang,Yage Li,Tianjia Yu,Youwei Yao,Hongda Du,Qiang Cai
Generally, foamed epoxy resin prepared by chemical method has relatively large average cell size and low cell density, resulting in low mechanical properties and poor heat resistance. In this work, a new type of composite foaming agent (CFA) was prepared by filling the chemical foaming agent 4,4′-bisoxybenzenesulfonyl hydrazide (OBSH) into microporous silica microspheres (MSMs), and then used for epoxy resin foaming research. The effects of curing agent diethylenetriamine (DETA) and CFA contents on cell density and size were also discussed. The best epoxy resin foaming sample has a cell density of 10 6 cells cm −3 with an average cell diameter of 65 μm, and a high compressive strength of 34 MPa as well as a good heat resistance. These results indicate the potential application of CFA in epoxy resin foaming area.
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POLYMERS FOR ADVANCED TECHNOLOGIES
·
2022
·Vol. 33
·期 12
·4072-4083
·
IF 3.348
Zhonghang Fang,Qunzhang Tu,Zhiyuan Chen,Xinmin Shen,Ming Pan,Kang Liang,Xuan Yang
To improve interfacial adhesion to rubber matrix, a lower cost surface modification strategy of ultrahigh molecular weight polyethylene (UHMWPE) fiber was proposed by replacing expensive dopamine with the two-component system of catechol/tetraethylenepentamine (CAT/TEPA) and then depositing nano zinc oxide (ZnO NPs). By Michael addition reaction or Schiff base reaction between CAT and TEPA, the CAT/TEPA layer was coated on the fiber surface, and further served as a secondary functional platform to realize ZnO NPs deposition through coordination. The surface morphology, chemical structure and composition, wettability and thermal property of the UHMWPE fibers were investigated to evaluate the process and effect of the surface modification. The results of the single-filament tensile test indicated that the tensile strength of the UHMWPE fibers has no deterioration after the modification treatment. In comparison with the original fiber, the pull-out test showed that the highest interface adhesion between the modified UHMWPE fibers and rubber matrix increased by 80.4%. Additionally, it was found that the appropriate zinc ion concentration played an important role in the modification effect.
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