MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-11
·
IF 5.833
He Yanlei,Li Ning,Liu Xiangwei,Chen Wei,Zhu Xixi,Liu Qingyun
Urchin-like peroxidase mimics 5,10,15,20-tetrakis (4-carboxyl phenyl) porphyrin–functionalized CuCo 2 O 4 nanospheres (Por-CuCo 2 O 4 ) has been fabricated as an excellent visual biosensor. X-ray diffractometry (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS) have been employed to characterize the composition, morphologies, and elemental analysis of the as-synthesized Por-CuCo 2 O 4 . The catalytic activity of Por-CuCo 2 O 4 was evaluated by the chromogenic substrate 3,3′,5,5′-tetramethylbenzidine (TMB) with the aid of H 2 O 2 , which exhibited a visual blue change with an absorption maximum at 652 nm for only 10 s. The peroxidase-like behaviors of Por-CuCo 2 O 4 conformed to the Michaelis-Menten equation. Electrochemistry, radical scavenger, and fluorescence probe experiments verified that electron transfer, •O 2 − radicals, and holes (h + ) are the important factors during the catalytic oxidation of TMB. Based on the inhibition of dopamine (DA) on TMB oxidation, the Por-CuCo 2 O 4 -based colorimetric biosensor has been successfully constructed for sensitive determination of DA witha detection limit (LOD) of 0.94 μΜ. In addition, colorimetry was validated to detect DA in serum samples with high sensitivity and good selectivity. Graphical abstract
5,10,15,20-tetrakis (4-carboxyl phenyl) porphyrin–functionalized urchin-like CuCo 2 O 4 (Por-CuCo 2 O 4 ) with excellent peroxidase activity, ascribed to the synergistic effect between •O 2 − radicals and holes (h + ). A fast colorimetric sensor on the basis of Por-CuCo 2 O 4 has been constructed to quantitatively determine dopamine concentration in human serums.
研究领域:
纳米技术
·
生物传感器
·
分析化学
·
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 12
·3101-3109
·
IF 4.831
Li Shuhuai,Liu Chunhua,Yin Guihao,Luo Jinhui,Zhang Zhenshan,Xie Yixian
The authors describe an electrochemical sensor for the neonicotinoid insecticide imidacloprid (IMI) based on Pt-In catalytic nanocomposite film and Bromophenol blue amplification. The Pt-In nanocomposite film was deposited on the surface of a modified glassy carbon electrode. The composite molecularly imprinted polymer (MIP) was prepared by electro-polymerization using bromophenol blue doped o -aminophenol as functional monomer and 4-tert-butylcalix[6]arene-IMI supramolecular inclusion complex as template molecule. The experimental results showed that the current intensity of IMI was clearly amplified in the potential range from −0.3 to −1.8 V, because of the double amplification, based on the Pt-In film and Bromophenol blue catalysis. Moreover, the double recognition ability of the sensor, which relied on the MIP and the vacuum structure of 4-tert-butylcalix[6]arene, effectively increased the specific recognition performance. The feasibility of its practical applications has been demonstrated by the analysis of vegetable samples.
A supramolecular imprinted electrochemical sensor for imidacloprid determination was prepared based on Pt-In nanocomposite film and bromophenol blue amplification. Because of the advantages of the specific recognition sites in MIPs and supramolecular chemistry, the sensor showed good selectivity for imidacloprid.
研究领域:
分析化学
·
环境科学
·
农业科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2018
·Vol. 27
·期 4
·1927-1935
·
IF 1.34
Zhang Xiaosheng,Xu Hong,Dong Jinxiang
Nickel-ion-exchanged α -zirconium phosphate (Ni- α -ZrP) was synthesized by a mild hydrothermal synthesis method. Different raw material ratios (NaF/H 3 PO 4 /Ni(CH 3 COO) 2 ·4H 2 O) influence the particle size of the Ni- α -ZrP samples. The grain size could be controlled and distributed from 20 to 600 nm. Ni- α -ZrP was evaluated as an additive in lithium grease in a four-ball test. A 3.0 wt.% addition of Ni- α -ZrP to lithium grease yielded maximum non-seizure load values of 1235 N, and the wear scar diameter on the lower balls is 0.42 mm at 294 N. Compared with smaller particles, the addition of Ni- α -ZrP with a larger particle size to grease yields a better load-carrying capacity.
研究领域:
材料科学
·
化学工程
·
机械工程
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2013
·Vol. 31
·期 10
·1359-1371
·
IF 1.27
Zhang Tao,Yan Hong-qiang,Fang Zheng-ping,Peng Mao
Three kinds of novel aromatic diamine-based benzoxazines containing naphthalene, propane-2,2-diyldibenzene and neopentyl groups in the backbone, respectively (designated as BAPNCP, BAPBACP and BAPNPGCP, respectively), were synthesized and characterized. In addition, the effects of backbone structures on curing behaviors of the monomers and thermal and flammability properties of the resulting polymers were systematically studied. The results indicated that BAPNPGCP displayed the highest enthalpy of the curing reaction associated with the ring-opening of benzoxazine, which was due to the effect of benzoxazine ring content per unit mass. Interestingly, the 5 wt% weight loss temperature and char residue after thermogravimetric test for poly(BAPNPGCP) were 8 °C and 7% higher than those of poly(BAPBACP). Meanwhile, the total heat release of poly(BAPNPGCP) was less than half of that for poly(BAPBACP), indicating the substantial effect of benzoxazine ring content on flammability and char formation. Furthermore, it was found that poly(BAPNCP) gave the best thermal stability and flame retardancy, which was due to the synergistic effect between naphthalene group and benzoxazine ring content. This study provides new insight into the curing behavior of benzoxazine and further understanding on the high performance of polybenzoxazine.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 11
·2001-2007
·
IF 3.741
Ma Hong-Fei,Chen Ting-Ting,Luo Yu,Kong Fen-Ying,Fan Da-He,Fang Hai-Lin,Wang Wei
Novel nanocomposites were prepared from graphene oxide (GO) and octahedral tin dioxide (SnO 2 ) through a facile process that included synthesis of octahedral SnO 2 and the reduction of GO with ascorbic acid. The morphology and structure of the nanocomposites were characterized by UV–vis spectroscopy, transmission electron microscopy, and Raman spectroscopy. The nanocomposites were placed on a glassy carbon electrode where they displayed excellent performance in terms of differential pulse voltammetric determination of dopamine (DA). This is attributed to (a) the synergetic interactions between reduced graphene oxide (r-GO) and octahedral SnO 2 , and (b) the presence of a large number of active sites on the nanocomposites surface. The sensor responds to DA in the concentration range of 0.08 to 30 μM, with a 6 nM detection limit if operated at 0.24 V (vs. Ag/AgCl). The modified electrode also widely suppresses the background current resulting from excess ascorbic acid and uric acids. The method was applied to the determination of DA in spiked human urine and gave satisfactory results, with recoveries in the range from 96.4 to 98.2 %.
Green and facile synthesis of reduced graphene oxide-octahedral SnO 2 (r-GO-SnO 2 ) nanocomposites for the sensitive and selective electrochemical detection of dopamine.
研究领域:
分析化学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2014
·Vol. 9
·期 1
·1-6
·
IF 2.481
Zhang Qi,Li Houbin,Zhang Pan,Liu Liangliang,He Yuhang,Wang Yali
Modified carbon spheres (CSPBs) were obtained by grafting poly(diallyl dimethyl ammonium chloride) (p-DMDAAC) on the surface of carbon spheres (CSs). It can be viewed as a kind of cation spherical polyelectrolyte brushes (CSPBs), which consist of carbon spheres as core and polyelectrolytes as shell. The method of synthesizing carbon spheres was hydrothermal reaction. Before the polyelectrolyte brushes were grafted, azo initiator [4,4′-Azobis(4-cyanovaleric acyl chloride)] was attached to the carbon spheres' surface through hydroxyl groups. CSPBs were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR), gel permeation chromatography (GPC), conductivity meter, and system zeta potential. The results showed that compared with carbon spheres, the conductivity and zeta potential on CSPBs increased from 9.98 to 49.24 μS/cm and 11.6 to 42.5 mV, respectively, after the polyelectrolyte brushes were grafted. The colloidal stability in water was enhanced, and at the same time, the average diameter of the CSPBs was found to be 173 nm, and the average molecular weight and grafted density of the grafted polyelectrolyte brushes were 780,138 g/mol and 4.026 × 10 9 /nm 2, respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Central South University
·
2022
·Vol. 29
·期 5
·1423-1436
·
IF 2.392
Liu Jun-ru,Li Zhi-bo,Chen Ben,Chou Kuo-chih,Zhang Guo-hua
In order to improve the low ductility of the Mo-Ni alloy, Fe is added and the effects of Ni/Fe mass ratio on the densification behavior, microstructure evolution and mechanical properties of alloy were investigated. The experimental results show that when iron is added to 95Mo-5Ni alloy, the formation of brittle intermetallic phase δ -MoNi at the grain boundary is avoided. Meanwhile, the grain growth of Mo is also effectively inhibited in the sintering process. However, the addition of iron reduces the degree of densification of alloy since the activation effect of Ni is superior to that of Fe. From the experimental results, it could be concluded that the maximum hardness and bending strength are achieved by 95Mo-1.5Ni-3.5Fe alloy, which are HV 614 and 741 MPa, respectively. Combined with the analyses of bending fracture mechanism, the improvement relative to Mo-Ni alloy is likely attributed to the inhibition of the brittle phase.
研究领域:
材料科学
·
金属学
✓ 已验证
DOI
高影响因子
Journal of Flow Chemistry
·
2019
·Vol. 9
·期 4
·211-220
·
IF 2.277
Hu JiaYu,Tian Jiaxin,Wang Kai,Deng Jian,Luo Guangsheng
Herein, a continuous synthetic method of tetraethyl thiuram disulfide (TETD) with CO 2 as a weak acid reagent in a gas-liquid microdispersion reaction system has been described. A microdispersion reaction system comprising two microreactors for CO 2 absorption and diethyldithiocarbamate acid subsequent oxidation reaction was developed. In the first step, the main products of absorption and oxidation reactions were identified. Next, the yield of TETD and selectivity of sodium diethyldithiocarbamate under different flow rates of raw materials, amount of CO 2 , aging effect, and pressure in the microreaction system were determined. The yield reached 89.03% based on 60% H 2 O 2 dosage and the selectivity was 92.86% in less than 3 min of residence time, which was more than 30 min in the batch process. The space time yield in the microreaction system was ~20 times of that achieved in the batch process. The study provides a new successful reference for replacing batch synthesis by a continuous process using a microreaction system.
研究领域:
化学工程
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 14
·11870-11877
·
IF 2.22
Chen Weigang,Yang Pengyu,Shen Wenfeng,Zhu Chaoting,Lv Dawu,Tan Ruiqin,Song Weijie
Flexible room temperature sub-ppm ammonia (NH 3 ) gas-sensing films based on polyaniline (PANI) nanoparticles were successfully developed on porous polyvinylidene fluoride (PVDF) substrate by in suit chemical oxidative polymerization method. The fabricated PANI/PVDF film sensor, which was synthesized with 0.1 mol/L aniline, possesses the best response value of 24.5% and 2.6% to 1 ppm and 0.1 ppm NH 3 at room temperature, respectively. Furthermore, the PANI/PVDF film sensor shows excellent selectivity towards NH 3 compared with methanol, ethanol, acetone, toluene, and formaldehyde at room temperature. The improved sensing performance is related to the porous PVDF nanostructure and synergetic effects of PVDF and PANI. Finally, the effect of working temperature and relative humidity on the sensing properties of the PANI/PVDF thin film sensor was also discussed and analyzed. The results show the potential application of the flexible PANI/PVDF film sensor for monitoring sub-ppm NH 3 gas under ambient conditions.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 23
·35204-35216
·
IF 5.19
Song Xu,Mo Jingqian,Fang Yuting,Luo Shumin,Xu Jingjing,Wang Xu
We prepared a double-layer magnetic nanocomposite Fe 3 O 4 @ZIF-8@ZIF-67 by layer-by-layer self-assembly. Fe 3 O 4 @ZIF-8@ZIF-67 was used to remove tetracycline from an aqueous solution via a combination of adsorption and Fenton-like oxidation. Depending on the outstanding porous structure of the Fe 3 O 4 @ZIF-8@ZIF-67, a high adsorption capacity for tetracycline was 356.25 mg g −1 , with > 95.47% removal efficiency within 100 min based on Fenton-like oxidation. To better understand the mechanisms involved in integrated adsorption and Fenton-like oxidation, various advanced characterization techniques were used to monitor the changes in morphology and composition of Fe 3 O 4 @ZIF-8@ZIF-67 before and after removal of tetracycline. Scanning electron microscopy/energy-dispersive X-ray spectroscopy (SEM/EDS), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) all supported adsorption and Fenton oxidation of tetracycline. This study extends the application of Fe 3 O 4 @ZIF-8@ZIF-67 for environmental remediation. Graphical abstract
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2013
·Vol. 143
·期 10
·1030-1034
·
IF 2.244
Zhang Jing,Yao Weifeng,Liu Mingshuang,Xu Qunjie,Wu Qiang,Zeng Tao
Abstract Synthesis of monodisperse Pt nanocrystals with cubic and cuboctahedral shapes were successfully done by using a chemical reduction method. The catalytic performance of Pt nanoparticles toward methanol electrooxidation was measured. The results indicate that Pt cuboctahedra with external Pt{100} and Pt{111} crystallographic facets showed a higher catalytic activity for methanol electrooxidation than the commercial Pt/C catalyst. Graphical Abstract
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 53
·80693-80704
·
IF 5.19
Wei Qiqi,Chen Jiuyan,Zhang Qiang,Lu Taotao,Farooq Usman,Chen Weifeng,Qi Zhichong
Colloid-mediated contaminant mobility is absolutely critical for the environmental behavior of contaminants such as antibiotics in water resources. In this study, the influences of phosphate (a commonly inorganic ligand in the environment) on the ferrihydrite colloid-mediated transport of tetracycline (TC, a typical antibiotic) in porous media were investigated. In the absence of colloids, phosphate promoted TC mobility due to the competitive deposition of phosphate and TC on the sand surface as well as the electrostatic repulsion. Interestingly, ferrihydrite colloids could inhibit TC transport; however, the inhibitory effect of the colloids was weakened by the addition of phosphate. This phenomenon stemmed from colloid-associated TC mobility, the increased electrostatic repulsion induced by adsorbed phosphate, and deposition site competition effect. Another interesting finding was that the impacts of phosphate on the colloid-mediated mobility of TC were pH-dependent. That is, phosphate exhibited a weaker effect on the inhibitory role of ferrihydrite colloids in TC mobility at pH 5.0 than that at pH 7.0; specially, ferrihydrite colloids acted as possible carriers of TC and facilitated antibiotic transport at pH 9.0. The observations were ascribed to different influences of phosphate on the binding affinity of ferrihydrite toward TC and the mobility of free TC under different pH conditions. Therefore, the findings of this study provide useful information about the fate and co-transport of antibiotics and natural mineral colloids in the presence of inorganic ligands in the aquatic environment.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）