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1.
Novel water-compatible molecularly imprinted polymers were synthesized in methanol-water systems with Tratarzine as template and 1-(α-methyl acrylate)-3-methylimidazolium bromide (1-MA-3MI-Br) as functional monomer, which has π-π hydrophobic, hydrogen-bonding and electrostatic interactions with template molecule. 1-MA-3MI-Br molecularly imprinted polymers (1-MA-3MI-Br-MIPs) were used as selective sorbents for the solid-phase extraction (SPE) of water-soluble acid dyes from wastewater and soft drink. The good linearity of the method was obtained in a range of 5.0-2000 μg/L with the correlation coefficient of > 0.999. The detection limits were in a range of 0.13-0.51 μg/L for the water-soluble acid dyes in wastewater and 0.095-0.84 μg/L for those in soft drink. The mean recoveries for the acid dyes are from 89.1% to 101.0% in spiked wastewater and 91.0-101.3% in spiked soft drink. Compared with strongly anion exchange solid phase extraction (SAX-SPE), mixture anion exchange solid phase extraction (MAX-SPE), and 1-MA-3MI-Br non-imprinted solid phase extraction (1-MA-3MI-Br-NISPE), almost all of the matrix interferences were removed by 1-MA-3MI-Br-MISPE, exhibiting higher selectivity, recovery and enrichment ability for the acid dyes and better baselines in the results of HPLC analysis. 相似文献
2.
Tao Wenyan Tu Xinman Chen Jian Zhu Qian Zhu Yongqian 《Journal of Solid State Electrochemistry》2019,23(5):1613-1619
Journal of Solid State Electrochemistry - Here, a nanoporous gold electrode (NAu) was reported with a unique cone-shape nanohole structure for electrochemical sensing of nitric oxide (NO), which... 相似文献
3.
Xinman Chen Guangheng Wu Hailei Zhang Ni Qin Tao Wang Feifei Wang Wangzhou Shi Dinghua Bao 《Applied Physics A: Materials Science & Processing》2010,100(4):987-990
We report on reversible bipolar resistance switching effects in multiferroic BiFeO3 thin films without electroforming. The BiFeO3 thin films with (110) preferential orientation were prepared on LaNiO3-electrodized Si substrates with a Pt/BiFeO3/LaNiO3 device configuration. The resistance ratio of high resistance state (HRS) to low resistance state (LRS) of the devices was
as high as three orders of magnitude. The dominant conduction mechanisms of LRS and HRS were dominated by ohmic behavior and
trap-controlled space charge limited current, respectively. The resistance switching mechanism of the devices was discussed
using a modified Schottky-like barrier model taking into account the movement of oxygen vacancies. 相似文献
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5.
Xubiao Luo Yining Huang Fang Deng Shenglian Luo Youcai Zhan Hongying Shu Xinman Tu 《Mikrochimica acta》2012,179(3-4):283-289
We have developed a convenient, selective and reliable method for the rapid enrichment of trace quantities of Cu(II) by using a magnetic Cu(II) ion-imprinted polymer. This is followed by their determination by FAAS. The imprints were prepared by using (a) Cu(II) ions as the template, (b) 3-aminopropyltriethoxysilane as both the functional monomer and the crosslinking agent, and (c) Fe3O4 as the magnetic component. Enrichment is carried out in a single step, and adsorbed copper ions can be separated from the sample solution by applying a strong magnet. The effects of pH, elution condition, amount of imprint, and of potentially interfering ions were evaluated. Under the optimal conditions, the detection limit and enrichment factor are 0.3?μg L?1 and 100, respectively, and the recovery is >95?%. The procedure was successfully applied in the enrichment and detection of trace copper ions in environmental water. Figure
General procedure for preconcentration/recovery of Cu (II) ions 相似文献
6.
Xinman Chen Hong Zhou Guangheng Wu Dinghua Bao 《Applied Physics A: Materials Science & Processing》2011,104(1):477-481
A heterojunction structure of p-NiO/n-Mg0.6Zn0.4O with an aim to tuning or improving the resistive switching properties was fabricated on Pt/TiO2/SiO2/Si substrates by the sol-gel spin-coating technique. The Pt/NiO/Mg0.6Zn0.4O/Pt heterojunction thin-film device shows excellent resistive switching properties, such as a reduced threshold current of
1 μA for device initiation, a small dispersion of reset voltage ranging from 0.54 to 0.62 V, long retention time and a high
resistance ratio of high-resistance state to low-resistance state about six orders of magnitude. These results indicate that
the resistive switching properties can be greatly improved by constructing the p-NiO/n-Mg0.6Zn0.4O heterojunction for nonvolatile memory applications. The physical mechanism responsible for colossal resistive switching
properties of the heterojunction was analyzed based on interfacial defect effect and formation and rapture of conductive filaments. 相似文献
7.
Feifei Wang Wangzhou Shi Yanxue Tang Xinman Chen Tao Wang Haosu Luo 《Applied Physics A: Materials Science & Processing》2010,100(4):1231-1236
In present work, a simple longitudinal piezoelectric transformer with the size of 16-mm length, 2-mm width, and 2-mm thickness
was designed and fabricated with relaxor ferroelectric single-crystal (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3. Both the input and output parts utilized the ultrahigh longitudinal extensional electromechanical coupling coefficients.
Compared to the Rosen-type transformer, this transformer has the advantages of smaller-size, simpler structure, no spurious
vibration, and no acoustic mismatch between the input and output parts. The electrical measurement results indicated that
under the resonance frequency of 114 kHz, a step-up voltage of about 30 can be obtained under a 10-MΩ load resistance, which
agreed well with the calculated results. Besides, the frequency and load dependences of this transformer were also systematically
studied and discussed. The results indicated that this transformer has potential applications in the small-size high-voltage
amplifier and magnetoelectric/piezoelectric-transformer composite transducers. 相似文献
8.
Pinghua Chen Huitao Zheng Hualin Jiang Jun Liu Xinman Tu Weibo Zhang Bailey Phillips Lei Fang Jian-Ping Zou 《中国化学快报》2022,33(2):907-911
To address the challenge of treating complex pollutants containing heavy metals and organic compounds,a phenanthroline/TiO2 nanocomposite with rich oxygen vacancy defects was synthesized to integrate the functions of pollutant detection, adsorption, and photocatalytic degradation. The results showed that the nanocomposite could adsorb Cr3+and the process could be transduced into a colorimetric signal for qualitative and quantitative detection. The adsorbed heavy metal also ... 相似文献
9.
Guisheng Zeng Xianyong Wang Shenglian Luo Hui Li Xinman Tu Xubiao Luo Jianping Zou 《Acoustical Physics》2014,60(3):356-360
The effect of ultrasound vibrations on the cooling crystallization of sodium arsenate in supersaturated solutions was investigated. In particular, the effects of ultrasound vibrations on induction time and crystal size distribution were studied using a laser-based apparatus with relative supersaturation ranging from 1.3 to 1.8. The results show that ultrasound vibrations have a significant effect on reducing induction time and crystal size distribution. The application of ultrasound vibrations to the system resulted in a small change in surface tension; however, the induction time and crystal size significantly decreased. The mean size of sodium arsenate crystals decreased from 398.87 ± 3.27 to 168.68 ± 2.07 μm, as the ultrasound power increases from 26 to 130 W. Ultrasound vibrations significantly reduced the induction time in a highly supersaturated solution compared to that in a low supersaturated solution. 相似文献
10.
A sensitive electrochemical method was developed for the determination of bisphenol A (BPA) at a glassy carbon electrode (GCE) modified with a multiwalled carbon nanotubes (MWCNTs)‐gold nanoparticles (GNPs) hybrid film, which was prepared based on the electrostatic interaction between positively charged cetyltrimethylammonium bromide (CTAB) and negatively charged MWCNTs and GNPs. The MWCNT‐GNPs/GCE exhibited an enhanced electroactivity for BPA oxidation versus unmodified GCE and MWCNTs/GCE. The experimental parameters, including the amounts of modified MWCNTs and GNPs, the pH of the supporting electrolyte, scan rate and accumulation time, were examined and optimized. Under the optimal conditions, the differential pulse voltammetric anodic peak current of BPA was linear with the BPA concentration from 2.0×10?8 to 2×10?5 mol L?1, with a limit of detection of 7.5 nmol L?1. The proposed procedure was applied to determine BPA leached from real plastic samples with satisfactory results. 相似文献