Nano Convergence
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2020
·Vol. 7
·期 1
·1-18
·
IF 2.919
Cao Dingding,Shu Xugang,Zhu Dandan,Liang Shengli,Hasan Murtaza,Gong Sheng
ZnO nanoparticles are widely used in biological, chemical, and medical fields, but their toxicity impedes their wide application. In this study, pristine ZnO NPs (~ 7 nm; ~ 18 nm; ~ 49 nm) and lipid-coated ZnO NPs (~ 13 nm; ~ 22 nm; ~ 52 nm) with different morphologies were prepared by chemical method and characterized by TEM, XRD, HRTEM, FTIR, and DLS. Our results showed that the lipid-coated ZnO NPs (~ 13 nm; ~ 22 nm; ~ 52 nm) groups improved the colloidal stability, prevented the aggregation and dissolution of nanocrystal particles in the solution, inhibited the dissolution of ZnO NPs into Zn2+ cations, and reduced cytotoxicity more efficiently than the pristine ZnO NPs (~ 7 nm; ~ 18 nm; ~ 49 nm). Compared to the lipid-coated ZnO NPs, pristine ZnO NPs (~ 7 nm; ~ 18 nm; ~ 49 nm) could dose-dependently destroy the cells at low concentrations. At the same concentration, ZnO NPs (~ 7 nm) exhibited the highest cytotoxicity. These results could provide a basis for the toxicological study of the nanoparticles and direct future investigations for preventing strong aggregation, reducing the toxic effects of lipid-bilayer and promoting the uptake of nanoparticles by HeLa cells efficiently.
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Frontiers of Environmental Science & Engineering
·
2019
·Vol. 14
·期 2
·1-16
·
IF 3.883
Wang Xiangyu,Xie Yu,Yang Guizhen,Hao Jiming,Ma Jun,Ning Ping
The secondary pollution caused by modification of an electrode due to doping of harmful materials has long been a big concern. In this study, an environmentally friendly material, conductive carbon black, was adopted for modification of lead dioxide electrode (PbO 2 ). It was observed that the as-prepared conductive carbon black modified electrode (C-PbO 2 ) exhibited an enhanced electrocatalytical performance and more stable structure than a pristine PbO 2 electrode, and the removal efficiency of metronidazole (MNZ) and COD by a 1.0% C-PbO 2 electrode at optimal conditions was increased by 24.66% and 7.01%, respectively. Results revealed that the electrochemical degradation of MNZ wastewater followed pseudo-first-order kinetics. This intimates that the presence of conductive carbon black could improve the current efficiency, promote the generation of hydroxyl radicals, and accelerate the removal of MNZ through oxidation. In addition, MNZ degradation pathways through a C-PbO 2 electrode were proposed based on the identified intermediates. To promote the electrode to treat antibiotic wastewater, optimal experimental conditions were predicted through the Box-Behnken design (BBD) method. The results of this study suggest that a C-PbO 2 electrode may represent a promising functional material to pretreat antibiotic wastewaters.
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TRIBOLOGY LETTERS
·
2020
·Vol. 68
·期 1
·1-11
·
IF 2.566
Yang Ye,Liu Tengfei,Dai Yuanjing,Wang Yan,Zhang Chenhui
This work investigates the effect of amines on the lubricity of castor oil-sulfated sodium salt (CSS) emulsion solution for titanium alloys. It is found that the amines with hydrophilic parts such as diglycolamine, have a negative effect on the lubrication while those with hydrophobic parts such as dicyclohexylamine (DCHA), show a synergistic effect when they are mixed with the CSS. The mechanisms of both the synergistic and negative effects of amines are investigated. The quartz crystal microbalance with dissipation-monitoring results show that the ammonium salt with hydrophobic parts such as DCHA can form a strong adsorption film on the titanium surface. These findings indicate that the amines with hydrophobic parts can be used as a pH regulator and corrosion inhibitor for developing an effective cutting fluid for titanium alloys.
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Nano Research
·
2019
·Vol. 12
·期 12
·3116-3122
·
IF 8.515
Lu Shaojie,Wang Wenjing,Yang Shengshuang,Chen Wei,Zhuang Zhongbin,Tang Wenjing,He Caihong,Qian Jiajing,Ma Dekun,Yang Yun,Huang Shaoming
Developing non-precious metal catalysts with high activity and stability for electrochemical hydrogen evolution reaction (HER) is of great significance in both science and technology. In this work, N-doped CMK-3, which was prepared with a casting method using SBA-15 as the hard template and ammonia as the nitrogen source, has been utilized to hold MoS 2 and restrict its growth to form MoS 2 @N-CMK-3 composite. As a result, MoS 2 was found to have poorly crystallized and the limited space of porous N-CMK-3 made its size much small. Then there are more active sites in MoS 2 . Accordingly, MoS 2 @N-CMK-3 has exhibited good electrocatalytic performance toward HER in acids with a quite small Tafel slope of 32 mVdec” 1 . And more importantly, compared to MoS 2 @CMK-3, its stability has been greatly improved, which can be attributed to the interaction between MoS 2 and nitrogen atoms avoiding aggregation and mass loss. This work provides an idea that doping a porous carbon support with nitrogen is an effective way to enhance the stability of the catalyst.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 24
·20970-20978
·
IF 2.195
Gong Pengyu,Chen Qingyun,Shih Kaimin,Liao Changzhong,Wang Lielin,Xie Hua,Deng Sihao
The structure and magnetic properties of the magnetite can be substantial corrected by incorporating foreign cations. In this work, Tb 3+ was successfully incorporated into magnetite and superparamagnetic magnetite nanoparticles were obtained, using solvothermal method. The doping of Tb 3+ greatly reduces the M r and H c values of the magnetite. Due to the doping of high magnetic moment Tb 3+ , the original magnetic moment of the magnetite is destroyed and magnetic domain are decomposed, resulting in a significant reduction in remanence and magnetic agglomeration. The remarkable effect of Tb 3+ doping degaussing will provide new prospects for the application of magnetite materials in the superparamagnetic direction.
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Electrocatalysis
·
2019
·Vol. 11
·期 1
·59-67
·
IF 2.311
Guan Jibiao,Fang Yini,Zhang Ting,Wang Lina,Zhu Han,Du Mingliang,Zhang Ming
Biomass-derived porous carbon materials with environmental adaptability and superior specific surface area have become one of the most promising materials in 21st era, especially in the electrochemical application. Herein, we proposed a kelp-derived carbon material (KPC) with a unique highly disordered graphite layer structure as an outstanding sensor via facile KOH activation method. The BET adsorption-desorption isotherm of KPC shows a typical IUPAC I type, and KPC possesses a high specific surface area with 2064 m 2 g −1 . Morphology observation and pore size analysis indicate that its porous-rich structure comprises countless micropores and mesopores. This unique structure of KPC not only provides massive active sites but exhibits high sensitivity in the detection of heavy metal by square wave anodic stripping voltammetry (SWASV), with Pb 2+ at 53.4 μA μM −1 and Cd 2+ at 26.5 μA μM −1 in simultaneous detection. This study reports a new strategy for the detection of heavy metal ions using porous metal-free carbon materials.
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JOURNAL OF FLUORESCENCE
·
2019
·Vol. 29
·期 6
·1285-1290
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IF 1.913
Wen Qin,Liu Wanqiang,Zheng Yuhui,Gao Jinwei
In this study, the bio-inspired self-cracking substrate can be employed as a template to control the formation of a robust mirco-patterning film. Uniform materials with variable diameters are achieved by optimizing the egg white/water ratios and reaction temperature. The incorporated europium ions exhibit its typical f-f transitions in patterned films. Moreover, the mechanical property and excellent transmittance features have been demonstrated. The current approach can be extended to design two-dimensional nanofabrication of different materials.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Jiang Ningjing,Zhu Tingfeng,Hu Yongjun
It is known that the intensity of surface-enhanced Raman scattering (SERS) of monomeric gold nanoparticles (GNPs) is insufficient for ultrasensitive analysis. The authors describe dimeric GNPs for use in a competitive SERS and aptamer based assay for thrombin. The reagent 1,2-bis(4-pyridyl) ethylene serves as both the coupling agent and the Raman reporter on the GNP dimers. In the presence of thrombin, the hybridization of two aptamers, one attached to the GNP dimers, the other to magnetic nanoparticles, is competitively prevented. This method takes advantage of the unique “hot spots” of the GNP dimers to amplify the Raman signal. This results in an ultra-sensitive thrombin assay when compared to assays using GNP monomers. The limit of detection is as low as 1 fM of thrombin. The Raman intensity, best measured at 1612 cm −1 , increases linearly in the 1 fM to 10 nM thrombin concentration range. The method was applied to the determinaiton of thrombin in spiked simulated body fluid and human serum.
This method takes advantage of the unique “hot spots” of the gold nanoparticle dimers to amplify the Raman signal. The dimers are linked to the magnetic nanoparticles via an aptamer. The use of both competitive displacement and magnetic separation greatly improves the sensitivity of the thrombin assay.
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Stem Cell Research & Therapy
·
2019
·Vol. 10
·期 1
·1-11
·
IF 4.627
Liao Naishun,Shi Yingjun,Zhang Cuilin,Zheng Youshi,Wang Yingchao,Zhao Bixing,Zeng Yongyi,Liu Xiaolong,Liu Jingfeng
Background Adipose tissue-derived mesenchymal stem cells (ADSCs) are promising candidates for regenerative medicine. However, long-term in vitro passaging leads to stemness loss and cell senescence of ADSCs, resulting in failure of ADSC-based therapy. Methods In this study, ADSCs were treated with low dose of antioxidants (reduced glutathione and melatonin) with anti-aging and stem cell protection properties in the in vitro passaging, and the cell functions including stem cell senescence, cell migration, cell multidirectional differentiation potential, and ROS content were carefully analyzed. Results We found that GSH and melatonin could maintain ADSC cell functions through reducing cell senescence and promoting cell migration, as well as by preserving stemness and multidirectional differentiation potential, through inhibiting ROS generation during long-term expansion of ADSCs. Conclusions Our results suggested that antioxidant treatment could efficiently prevent the dysfunction and preserve cell functions of ADSCs after long-term passaging, providing a practical strategy to facilitate ADSC-based therapy.
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-9
·
IF 11.878
Yan Jianhua,Dong Keqi,Zhang Yuanyuan,Wang Xiao,Aboalhassan Ahmed Abdulqawy,Yu Jianyong,Ding Bin
Conductive porous carbon nanofibers are promising for environmental, energy, and catalysis applications. However, increasing their porosity and conductivity simultaneously remains challenging. Here we report chemical crosslinking electrospinning, a macro–micro dual-phase separation method, to synthesize continuous porous carbon nanofibers with ultrahigh porosity of >80% and outstanding conductivity of 980 S cm −1 . With boric acid as the crosslinking agent, poly(tetrafluoroethylene) and poly(vinyl alcohol) are crosslinked together to form water-sol webs, which are then electrospun into fibrous films. After oxidation and pyrolysis, the as-spun fibers are converted into B-F-N triply doped porous carbon nanofibers with well-controlled macro–meso–micro pores and large surface areas of ~750 m 2 g −1 . The sponge-like porous carbon nanofibers with substantially reduced mass transfer resistances exhibit multifunction in terms of gas adsorption, sewage disposal, liquid storage, supercapacitors, and batteries. The reported approach allows green synthesis of high-performance porous carbon nanofibers as a new platform material for numerous applications.
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Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-6
·
IF 3.159
Zhao Yingjian,Wang Yong
Polyethylene oxide (PEO)-based solid polymer electrolytes (SPEs) have important significance for the development of next-generation rechargeable lithium-ion batteries. However, strong coordination between lithium ions and PEO chains results the ion conductivity usually lower than the expectation. In this study, sub-micron montmorillonite is incorporated into the PEO frames as Lewis base center which enables the lithium ions to escape the restraint of PEO chains. After involving montmorillonite (MMT) into the SPEs, the ionic conductivity of SPEs is 4.7 mS cm − 1 at 70 °C which shows a comparable value with that of liquid electrolyte. As coupling with LiFePO 4 material, the battery delivers a high discharge capacity of 150.3 mAh g − 1 and an excellent rate performance with a capacity of 111.8 mAh g − 1 at 0.16 C and maintains 58.2 mAh g − 1 at 0.8 C. This study suggests that the customized incorporation of Lewis base materials could offer a promising solution for achieving high-performance PEO-based solid-state electrolyte.
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CHEMICAL PAPERS
·
2019
·Vol. 74
·期 6
·1717-1727
·
IF 1.246
Wang Jun,Wang Yan,Liu Xin-Xin,Li De-Ming,Li Sui-Xin
Determination of pyraclostrobin in ginseng samples by molecularly imprinted dispersive solid-phase extraction (MIDSPE) coupled with high-performance liquid chromatography (HPLC) method was developed. Molecularly imprinted polymers (MIPs) were prepared by precipitation polymerization using pyraclostrobin as template, methacrylic acid (MAA) as functional monomer, ethylene glycol dimethacrylate (EGDMA) and azobisisobutyronitrile (AIBN) as cross-linker and initiator, respectively. The mixture of butanone (MEK) and n -heptane (7:3, V:V) was used as solvent and porogen. The microspheres were characterized by laser particle size analyzer, scanning electron microscopy (SEM) and Fourier transform infrared spectrometry (FTIR). Binding experiments showed high binding capacity of polymers, and that the maximum adsorption of MIPs and NIPs to pyraclostrobin was 73.01 mg g −1 and 59.14 mg g −1 . Selective adsorption experiments verified that polymers had specific and selective recognition site for pyraclostrobin. Comparing MIPs with C 18 , the recoveries of pyraclostrobin from blank ginseng samples spiked at 0.05, 0.1, and 1.0 mg kg −1 ranged between 77.6% and 93.5% with the standard deviation of 2.18–6.07 and the relative standard deviations (RSDs) between 2.47 and 6.99% ( n = 5). The recoveries of pyraclostrobin that used C 18 as sorbent were found to be 53.04–63.86% with the standard deviation of 1.13–2.83 and the relative standard deviations of 1.07–4.99%. The data indicated that the method for the analysis of the pyraclostrobin in ginseng samples can achieve good recoveries, repeatability and reproducibility. The linear regression equation was calculated as y = 2.09935e−006 x + 0.0176235 ( R 2 = 0.998656). The limit of detection (LOD, S/N = 3) was 0.01 mg kg −1 . The confidence interval for the slope at the 95% confidence level was [356084.1828, 899542.8563], and the confidence interval for the intercept was [− 755349.2710, 72645.0856]. The MIDSPE-HPLC method showed specific selective separation and enrichment of trace pyraclostrobin in ginseng samples. The raw samples were tested and results were all below the maximum Residue Limit (MRL) 0.1 mg kg −1 in the European Union.
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