MICROCHIMICA ACTA
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2020
·Vol. 187
·期 10
·1-9
·
IF 6.232
Jiao Mingxia,Li Yun,Jia Yuxiu,Xu Le,Xu Guiyun,Guo Yingshu,Luo Xiliang
Water-soluble Cu nanoclusters (NCs) with tunable emission were synthesized through an eco-friendly one-pot aqueous method. Blue-, green-, and red-emitting NCs with the emission peaks at 420 nm, 505 nm, and 630 nm were obtained by employing ethanediamine, cysteine, and glutathione as surface ligands, respectively. The ligand effects on the optical properties of Cu NCs were studied by the single variable method. It has been revealed by systematic characterizations that the dependence of emission color on the structures of ligands was mainly attributed to their different size-tuning effects. Glutathione has the strongest chelating ability and it can significantly reduce the monomer reactivity and thus decrease the supersaturation degree of the reaction, which is favorable for modulating Cu precursor to grow into larger NCs. In contrast, ethanediamine ligand resulted in smaller nanoclusters due to its weaker binding capability. Because of the strong emission and terrific fluorescent stability, Cu NCs capped with ethanediamine, possessing an emission peak at 420 nm when excited at a wavelength of 350 nm, were directly used for probing Hg(II) with satisfying selectivity, presenting a linear range of 0.1–5.0 mM and a detection limit of 33 μM. The sensor showed good performance in real sample analysis with recoveries ranging from 99% to 103%, and comparable accuracy with atomic fluorescence spectroscopy, manifesting the reliability of the current strategy for sensing Hg(II).
Water-soluble copper nanoclusters with blue, green, and red emissions were synthesized by employing ethanediamine, cysteine, and glutathione as surface ligands respectively, and the blue-emitting nanoclusters with strong emission and terrific stability were directly used for selectively sensing Hg 2+ .
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ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2020
·Vol. 46
·期 7
·6207-6217
·
IF 1.711
Ahmed Numan,Zhang Xianwei,Fahad Shah,Jamil Muhammad Imran,Aziz Tariq,Husamelden E.,Bittencourt Carla,Wan Jintao,Fan Hong
Nanoadditives are promising materials for long-envisioned next-generation lubricants to achieve excellent tribological performance and thermal stability. Here, an instigative and novel approach has been scrutinized to facilely prepare the nanolubricant additive. For this purpose, three synthetic strategies were designed for i) preparation of uniform-sized poly(methyl silsesquioxane) (PMSQ) nanoparticles, ii) hydrosilylation of the long carbon chain of ethyl 10-undecenoate and iii) modification of PMSQ nanoparticles with hydrosilylation product through a condensation reaction, in order to obtain long-carbon-chain grafted nanohybrids. The morphology, composition, and properties of these nanohybrids were confirmed by 1 H-NMR, FTIR, SEM, EDS, and TGA. The effects of different concentrations of unmodified and modified PMSQ nanoparticles on the tribological properties of silicone oil were discussed. In the comparison of unmodified PMSQ nanoparticles, the modified one performs very well to reduce the coefficient of friction and wear scar diameter at low concentration. The TGA results revealed the extraordinary thermal stability of these particles, as their weight loss was only 19% at 800 °C which is remarkably higher than other solid lubricant additives. In this research, we tried to fill the deficiency of thermally stable material in the field of heavy machinery and industry. In addition, the environment-friendly (fluorine-free), superhydrophobic and self-cleaning surface effect of modified PMSQ nanoparticles was also observed. These silsesquioxane-based nanohybrids having synergistic effects, advantageous scientific values, and promising application prospects are expected to be more useful with other longer carbon chains.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
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2020
·Vol. 35
·期 4
·719-725
·
IF 0.64
Zhang Chenxu,Wu Xiangfeng,Jia Yunning,Chang Tianlong,Liu Zhifeng,Fu Yunxuan,Liu Xutao,Wang Hui,Shi Yimai,Zuo Yuqian
The SnO 2 quantum dots (SnO 2 QDs)/ZnS nanosheets (ZnSNs) heterojunction was fabricated via an in-situ synthetic method at room temperature. Rhodamine B, potassium dichromate, and tetracycline were used to discuss the photocatalytic activities of the as-prepared samples under the visible light illumination. The photocatalytic mechanism of the as-prepared samples was also proposed. The experimental results indicate that the degradation efficiency of the as-prepared SnO 2 QDs/ZnSNs heterojunction first increases and then decreases with increasing the usage of ZnSNs. When the mass ratio of SnO 2 QDs to ZnSNs is 1: 2 in 180 min, the asprepared samples have the highest degradation efficiency of 89.1% for rhodamine B, 97.7% for potassium dichromate, and 83.8% for tetracycline, which are much higher than 51.7%, 26.8%, and 0.9% of pure SnO 2 QDs as well as 37.9%, 87.1%, and 19.1% of pure ZnSNs, respectively. After it is repeatedly degraded for 3 times, it possesses the degradation efficiency of 62.5% for rhodamine B, which increases by 200.5% in comparison with 20.8% of the pure SnO 2 QDs. Moreover, the enhanced photocatalytic performances of the as-prepared hybrids are attributed to the formation of heterojunction between the SnO 2 QDs and ZnSNs. In addition, hydroxyl radicals and superoxide anion radicals play major roles during the photocatalytic degradation process, while holes play a minor role.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2020
·Vol. 27
·期 14
·16963-16971
·
IF 3.056
Gong Pijian,Li Chunyu,Li Xinxue
Marine diesel engines produce a lot of exhaust gas (NO, SO 2 ). Based on the situation that wet scrubbing methods have been already applied to ship desulfurization and seawater is easily accessible around the ships, this paper proposed a novel AOP (advanced oxidation process) of NaClO 2 (sodium chlorite) with Cl − (abundant Cl − exist in seawater) to remove NO from the flue gases of marine engines. The buffer capacity of NaAC (sodium acetate), the effect of Cl − concentration, and Cl − promotion mechanism on NO removal were investigated. The result showed that the existence of NaAC in solution could inhibit the rapid decline of the solution pH. The addition of Cl − achieved a remarkable promotion to NO removal at lower NaClO 2 concentration, which was due to the fast generation of ClO 2 from the promotion decomposition of NaClO 2 by Cl − in acidic condition. Then, the thermodynamic and dynamic mechanism of the generation of ClO 2 was intensively analyzed. And the mechanism of NO removal was discussed finally.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2020
·Vol. 324
·期 2
·903-911
·
IF 1.137
Wu Hao,Huang Wei,Duan Zhiqin,Luo Mingbiao,Wang Zhifen,Hua Rong
For the first time in laboratory, diffusion parameters of Se(IV) in the clay of Chinese Tamusu region(TMS clay) against compacted density, ionic strength and pH value were obtained by capillary method. Diffusion process can be Simplified by using one-dimensional semi-infinite medium diffusion model. The results show a good similarity with the international literature and meet the internationally recognized range of 10 −9 –10 −12 . This work will provide data support and theoretical references for the pre-selection of clay rock sites in China’s high-level radioactive waste deep geological repository.
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FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 2
·245-251
·
IF 1.797
Meng Guihua,Yan Jiayu,Wu Jianning,Zhang Weifang,Wang Yixi,Wang Qian,Liu Zhiyong,Guo Xuhong
Water pollution severely effects human health and ecosystems. This paper presents a simple method of superhydrophobic cotton fabric fabrication for oil/water separation, We implemented thiol-ene reaction using 3-(Trimethoxysilyl)propyl methacrylate (TMSPMA) and n -dodecyl mercaptan (NDM). to synthesize low surface energy hydrophobic modifier. Superhydrophobic cotton fabrics demonstrated excellent superhydrophobicity, which makes them outstanding materials for continuous and simultaneous removal of insoluble and emulsified oils. Chemical composition, morphology, and hydrophobicity of these cotton fabrics were confirmed by FTIR spectra, scanning electron microscopy (SEM), and water contact angle measurements, respectively. Fabrics samples maintained their superhydrophobic properties even after 20 cycles, separation efficiency was still above 98.5 %. Our superhydrophobic cotton fabric demonstrated a remarkable separation of emulsified oil. We believe that our quick and environmentally friendly method can be used in variety of applications involving water-in-oil emulsion separation and oil purification.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2020
·Vol. 412
·期 11
·2487-2494
·
IF 3.637
Xue Ning,Wu Shujie,Li Zongbing,Miao Xiangmin
A versatile nanocomposite was simply prepared based upon the electrostatic adsorption of positively charged gold nanoparticles with negatively charged graphene oxide ( nano-gold@GO), and utilized as a novel fluorescence quenching platform for ultrasensitive detection of adenosine triphosphate (ATP). In the designed system, DNA-stabilized Ag nanoclusters (DNA/AgNCs) were used as fluorescent probes, DNA duplex was formed in the presence of ATP, and they can electrostatically adsorb onto the surface of nano-gold@GO to quench the fluorescence signal. Upon the addition of exonuclease III (Exo III), the DNA duplex would be hydrolyzed into DNA fragments and resulted in the recovery of the fluorescence signals due to the diffusion of AgNCs away from nano-gold@GO. Based on these, sensitive detection of ATP was realized with a detection range of 5.0 pM–20 nM. Notably, a good recovery in the range of 94–104% was obtained when detecting ATP in human serum samples, indicating a promising application value in early disease diagnosis.
A functional positively charged nano-gold@graphene oxide was fabricated and utilized as an enhanced fluorescence quenching platform for the detection of ATP, coupled with exonuclease III-assisted signal amplification.
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POLYMER BULLETIN
·
2020
·Vol. 78
·期 2
·643-662
·
IF 2.014
Yan Jiali,Xu Miaojun
Abstract A novel hyperbranched mono-component intumescent flame retardant poly(piperazine methylphosphonic acid pentaerythritol ester) defined as PPMPPE was synthesized, and its chemical structure was characterized. The individual PPMPPE was incorporated into polyethylene (PE), and the fire resistance, thermal properties and flame retardant mechanism of PE composites were investigated in detail. The 1.6-mm PE/PPMPPE sheets fulfilled UL-94 V-0 level during vertical burning tests, and the limiting oxygen index was 25.3% when the loading amount of PPMPPE was 22 wt%. PPMPPE was completely melted, and the expanded char layer was generated on heating. The addition of PPMPPE stimulated the degradation and charring of PE composites in advance and improved the residual mass and thermal stability of FR-PE at high temperature. The cone calorimeter tests verified that the heat release rate and total heat release of PE/PPMPPE composites were obviously declined. PPMPPE exerted shielding effect in condensed phased and quenching active free radicals in the gas phase. The flame was constrained and even extinguished. Thus, PE composites fulfilled superior flame retardant properties. Graphic abstract
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Journal of Flow Chemistry
·
2020
·Vol. 10
·期 1
·227-234
·
IF 3.622
Yuan Wei-Qiang,Zhou Shou-Quan,Jiang Yu-Yan,Li Hao-Hong,Zheng Hui-Dong
Considering the low conversion and long reaction time in scaling up reaction in batch reactor, the organocatalyzed epoxidation reaction of styrene was intensified under continuous flow conditions using a commercial fluidic reactor (Corning Advanced Flow G1 Reactor). After investigating the effect of reaction temperature, catalyst amount, MeCN/ t -BuOH ratio, F O / F AB (buffer solution amount), total feed flow rate and operating mode on the epoxidation reaction, the optimal reaction conditions were identified under continuous flow conditions. Upon optimization, high conversion and excellent selectivity with short reaction time (3.17 min) can be obtained. We successfully developed a process for the rapid and continuous epoxidation of styrene using an organocatalyst with hydrogen peroxide as the oxidant. Compared with the batch conditions, the continuous flow reactor can exhibit unique advantages including high-speed, safety, continuousness and absence of amplifying effect, which will be significant for the industrial production of epoxides.
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Food Analytical Methods
·
2020
·Vol. 13
·期 4
·1008-1016
·
IF 2.667
Zha Yonghong,Liu Xiaolei,Hu Pan,Lu Shiying,Ren Honglin,Liu Zengshan,Liang Xiongyan,Yang Yuying,Li Yansong,Zhou Yu
Enzyme-linked immunosorbent assay (ELISA), as an immunoassay platform, usually suffers from poor sensitivity due to the limited signal intensity. To overcome this obstacle, an alkaline phosphatase–triggered immunoassay based on fluorogenic reaction of o -phenylenediamine and ascorbic acid was developed for sensitive detection of chloroacetamide herbicides in corn. The new immunoassay revealed limits of detection (LODs) for acetochlor (ATC), metolachlor, and propisochlor of 1.19 ng/mL, 2.34 ng/mL, and 3.40 ng/mL, respectively. The average recoveries of the three chloroacetamide herbicides in corn sample were 88.4%, 91.8%, and 87.6%, respectively. Such fluorescent immunoassay via in situ formation of fluorescent signal from scratch provides a new strategy with excellent sensitivity in point-of-care test of chloroacetamide herbicides.
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CELLULOSE
·
2020
·Vol. 27
·期 6
·3197-3209
·
IF 4.21
Etuk Samuel Samuel,Lawan Ibrahim,Zhou Weiming,Jiang Yifan,Zhang Qixing,Wei Xiao,Zhang Mingxin,Fernando Gerard Franklyn,Yuan Zhanhui
Abstract Polymer electrolyte membrane fuel cells operated at temperature above 100 °C has enhanced electrochemical reactions; reduce CO poisoning, lower electrocatalyst loading and good water management. Nafion, the commercial proton exchange membrane performs poorly at this temperature, necessitating synthesis of alternative membranes. Nanocrystalline cellulose (NCC) based membrane promises a better performance at high temperature due to its water retention capability. Herein, sulfonated NCC composite membrane doped with 1,2,4-triazole was synthesized using solution casting technique. Findings have shown that the synergistic effect of the sulfonic acid group and the 1,2,4-triazole yields high proton conductivity of 13 mScm −1 at 120 °C for NCC-poly vinyl alcohol-triazole5 (NCC-PVA-T5) composite membrane. The membranes were characterized with thermogravimetric analysis, fourier transform infrared spectroscopy, X-ray diffraction, electrochemical impedance spectroscopy, scanning electron microscopy and mechanical test to unravel the effect of the 1,2,4-triazole on the sulfonated NCC composite membranes. The elemental analysis of the membranes was also carried out to reveal the presence of triazole in the final membrane composites.
Graphic abstract
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Nature Communications
·
2020
·Vol. 11
·期 1
·1-10
·
IF 12.121
Sun Tingting,Zhou Beiying,Zheng Qi,Wang Lianjun,Jiang Wan,Snyder Gerald Jeffrey
Assembling thermoelectric modules into fabric to harvest energy from body heat could one day power multitudinous wearable electronics. However, the invalid 2D architecture of fabric limits the application in thermoelectrics. Here, we make the valid thermoelectric fabric woven out of thermoelectric fibers producing an unobtrusive working thermoelectric module. Alternately doped carbon nanotube fibers wrapped with acrylic fibers are woven into π-type thermoelectric modules. Utilizing elasticity originating from interlocked thermoelectric modules, stretchable 3D thermoelectric generators without substrate can be made to enable sufficient alignment with the heat flow direction. The textile generator shows a peak power density of 70 mWm −2 for a temperature difference of 44 K and excellent stretchability (~80% strain) with no output degradation. The compatibility between body movement and sustained power supply is further displayed. The generators described here are true textiles, proving active thermoelectrics can be woven into various fabric architectures for sensing, energy harvesting, or thermal management.
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