The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Xilin Xiao - One of the best experts on this subject based on the ideXlab platform.
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a square wave voltammetric method for the detection of microorganism populations using a mwnt modified Glassy Carbon electrode
Electrochimica Acta, 2012Co-Authors: Yongsheng Wang, Xilin Xiao, Lifu Liao, Yali Yuan, Jun He, Bo He, Yimou WuAbstract:Abstract A novel method for determination of trace amounts of microorganism populations in solution was developed by using a multiwalled Carbon nanotube (MWNT) modified Glassy Carbon electrode and square wave voltammetry (SWV). The simultaneous combination of MWNT and SWV allowed the electrochemical signal of electro-active materials in Escherichia coli O157:H7 ( E . coli ) to be dramatically amplified. Compared with a bare Glassy Carbon electrode, the MWNT-modified Glassy Carbon electrode showed catalytic properties in the oxidation of electro-active materials on cell surfaces. Moreover, SWV was proved to be more sensitive than cyclic voltammetry (CV) for investigation of the electrochemical behavior of cells. In this paper, a linear relationship was obtained between the SWV peak current and the cell concentration in the range 2 × 10 2 –2 × 10 8 cell mL −1 with a detection limit of 2 × 10 2 cell mL −1 . The effect of antibiotic drug Gentamycin Sulfate injection (GSI) on the growth of E . coli was also investigated.
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a square wave voltammetric method for the detection of microorganism populations using a mwnt modified Glassy Carbon electrode
Electrochimica Acta, 2012Co-Authors: Xilin Xiao, Lifu Liao, Yali Yuan, Guizhi Zhu, Bo Liu, Yongsheng WangAbstract:Abstract A novel method for determination of trace amounts of microorganism populations in solution was developed by using a multiwalled Carbon nanotube (MWNT) modified Glassy Carbon electrode and square wave voltammetry (SWV). The simultaneous combination of MWNT and SWV allowed the electrochemical signal of electro-active materials in Escherichia coli O157:H7 ( E . coli ) to be dramatically amplified. Compared with a bare Glassy Carbon electrode, the MWNT-modified Glassy Carbon electrode showed catalytic properties in the oxidation of electro-active materials on cell surfaces. Moreover, SWV was proved to be more sensitive than cyclic voltammetry (CV) for investigation of the electrochemical behavior of cells. In this paper, a linear relationship was obtained between the SWV peak current and the cell concentration in the range 2 × 10 2 –2 × 10 8 cell mL −1 with a detection limit of 2 × 10 2 cell mL −1 . The effect of antibiotic drug Gentamycin Sulfate injection (GSI) on the growth of E . coli was also investigated.
Alexander Wokaun - One of the best experts on this subject based on the ideXlab platform.
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influence of metal layer coated Glassy Carbon substrates on the properties of pld deposited li1 xmn2o4 δ films
Journal of Optoelectronics and Advanced Materials, 2010Co-Authors: F Simmen, Thomas Lippert, Petr Novak, Michael Horisberger, M Dobeli, M Mallepell, Alexander WokaunAbstract:Li 1+x Mn 2 O 4-δ thin films were deposited on plain or coated (Au, Pt, Au/Pt) Glassy Carbon substrates using pulsed laser deposition. The aim of the coating was to improve the conductivity and the adhesion between film and substrate. The application of different intermediate layers influenced the crystallinity, the surface morphology, and the cycle stability of the spinel films. Films deposited on Au/Pt coated Glassy Carbon showed the most intense (111) orientation and the best defined surface morphology with tetrahedral and octahedral particle shapes. Compared to films on other metallic layer/Glassy Carbon combinations, Li 1+x Mn 2 O 4-δ films on Au/Pt coated substrates displayed the lowest cycle stability.
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exponential growth of electrochemical double layer capacitance in Glassy Carbon during thermal oxidation
Carbon, 2003Co-Authors: Marion Bartsch, Rüdiger Kötz, Olivier Merlo, B Schaffner, Benno Schnyder, Alexander Wokaun, O. HaasAbstract:The evolution of the electrochemical double layer capacitance of Glassy Carbon during thermochemical gas phase oxidation was studied with electrochemical impedance spectroscopy. Particular attention was paid to the initial oxidation stage, during which the capacitance grows exponentially. This stage could be experimentally assessed by lowering the reaction temperature and oxidant partial pressure. After a specific oxidation time the capacitance growth experiences a cross-over to a logistic growth.
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evolution of bet internal surface area in Glassy Carbon powder during thermal oxidation
Carbon, 2002Co-Authors: Marion Bartsch, Rüdiger Kötz, Benno Schnyder, Alexander Wokaun, O. HaasAbstract:Abstract It is demonstrated that Glassy Carbon powder can be thermochemically activated. During activation, a film with open pores is created on the Glassy Carbon particles. This film has a large internal surface area, which is accessible to liquids and gases. A simple model for the evolution of the internal surface area in Glassy Carbon powder during thermochemical gas-phase oxidation is also presented and compared with experimental data. Experimental results are in qualitative agreement with the model. We found that a sharp particle size distribution is desirable with regard to potential technical applications.
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evolution of bet internal surface area in Glassy Carbon powder during thermal oxidation
Carbon, 2002Co-Authors: Rüdiger Kötz, Benno Schnyder, Alexander Wokaun, O. Haas, Marion Bartsch, Artur BraunAbstract:Abstract It is demonstrated that Glassy Carbon powder can be thermochemically activated. During activation, a film with open pores is created on the Glassy Carbon particles. This film has a large internal surface area, which is accessible to liquids and gases. A simple model for the evolution of the internal surface area in Glassy Carbon powder during thermochemical gas-phase oxidation is also presented and compared with experimental data. Experimental results are in qualitative agreement with the model. We found that a sharp particle size distribution is desirable with regard to potential technical applications.
Yongsheng Wang - One of the best experts on this subject based on the ideXlab platform.
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a square wave voltammetric method for the detection of microorganism populations using a mwnt modified Glassy Carbon electrode
Electrochimica Acta, 2012Co-Authors: Yongsheng Wang, Xilin Xiao, Lifu Liao, Yali Yuan, Jun He, Bo He, Yimou WuAbstract:Abstract A novel method for determination of trace amounts of microorganism populations in solution was developed by using a multiwalled Carbon nanotube (MWNT) modified Glassy Carbon electrode and square wave voltammetry (SWV). The simultaneous combination of MWNT and SWV allowed the electrochemical signal of electro-active materials in Escherichia coli O157:H7 ( E . coli ) to be dramatically amplified. Compared with a bare Glassy Carbon electrode, the MWNT-modified Glassy Carbon electrode showed catalytic properties in the oxidation of electro-active materials on cell surfaces. Moreover, SWV was proved to be more sensitive than cyclic voltammetry (CV) for investigation of the electrochemical behavior of cells. In this paper, a linear relationship was obtained between the SWV peak current and the cell concentration in the range 2 × 10 2 –2 × 10 8 cell mL −1 with a detection limit of 2 × 10 2 cell mL −1 . The effect of antibiotic drug Gentamycin Sulfate injection (GSI) on the growth of E . coli was also investigated.
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a square wave voltammetric method for the detection of microorganism populations using a mwnt modified Glassy Carbon electrode
Electrochimica Acta, 2012Co-Authors: Xilin Xiao, Lifu Liao, Yali Yuan, Guizhi Zhu, Bo Liu, Yongsheng WangAbstract:Abstract A novel method for determination of trace amounts of microorganism populations in solution was developed by using a multiwalled Carbon nanotube (MWNT) modified Glassy Carbon electrode and square wave voltammetry (SWV). The simultaneous combination of MWNT and SWV allowed the electrochemical signal of electro-active materials in Escherichia coli O157:H7 ( E . coli ) to be dramatically amplified. Compared with a bare Glassy Carbon electrode, the MWNT-modified Glassy Carbon electrode showed catalytic properties in the oxidation of electro-active materials on cell surfaces. Moreover, SWV was proved to be more sensitive than cyclic voltammetry (CV) for investigation of the electrochemical behavior of cells. In this paper, a linear relationship was obtained between the SWV peak current and the cell concentration in the range 2 × 10 2 –2 × 10 8 cell mL −1 with a detection limit of 2 × 10 2 cell mL −1 . The effect of antibiotic drug Gentamycin Sulfate injection (GSI) on the growth of E . coli was also investigated.
O Kraft - One of the best experts on this subject based on the ideXlab platform.
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Approaching theoretical strength in Glassy Carbon nanolattices
Nature Materials, 2016Co-Authors: J. Bauer, Ruth Schwaiger, Andreas Schroer, O KraftAbstract:The strength of lightweight mechanical metamaterials, which aim to exploit material-strengthening size effects by their microscale lattice structure, has been limited by the resolution of three-dimensional lithography technologies and their restriction to mainly polymer resins. Here, we demonstrate that pyrolysis of polymeric microlattices can overcome these limitations and create ultra-strong Glassy Carbon nanolattices with single struts shorter than 1 μm and diameters as small as 200 nm. They represent the smallest lattice structures yet produced-achieved by an 80% shrinkage of the polymer during pyrolysis-and exhibit material strengths of up to 3 GPa, corresponding approximately to the theoretical strength of Glassy Carbon. The strength-to-density ratios of the nanolattices are six times higher than those of reported microlattices. With a honeycomb topology, effective strengths of 1.2 GPa at 0.6 g cm(-3) are achieved. Diamond is the only bulk material with a notably higher strength-to-density ratio.
F. Wang - One of the best experts on this subject based on the ideXlab platform.
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a sensitive voltammetric sensor for taxifolin based on graphene nanosheets with certain orientation modified Glassy Carbon electrode
Sensors and Actuators B-chemical, 2015Co-Authors: F. WangAbstract:Abstract The electrodeposition of reduced graphene oxide (ERGO) film with preferred vertical orientation was fabricated on a Glassy Carbon electrode by using pulse potential method in a graphene oxide colloidal solution. Using square wave adsorptive stripping voltammetry (SWASV), the ERGO film was applied for the first time, in developing a high-sensitive electrochemical sensor for detection of taxifolin. Compared with bare Glassy Carbon electrode (GCE), the resulting electrodes (ERGO/GCE) exhibited excellent response toward the redox of taxifolin by significantly enhancing the redox peak currents and decreasing the peak-to-peak separation. Under the selected conditions, the peak currents were linear relationship with taxifolin concentration in the range of 1.0 × 10−8–1.0 × 10−6 mol L−1, with detection limit of 2.0 × 10−9 mol L−1. Besides, the ERGO/GCE also exhibited an excellent selectivity, stability, reproducibility and repeatability.
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methyl parathion sensors based on gold nanoparticles and nafion film modified Glassy Carbon electrodes
Sensors and Actuators B-chemical, 2010Co-Authors: Tianfang Kang, Liping Lu, F. Wang, Yan ZhangAbstract:Abstract Gold nanoparticles were electrochemically deposited on a Nafion film coated Glassy Carbon electrode to prepare a sensor for determining methyl parathion. The electrochemica1 behaviours of methyl parathion at the sensor based on gold nanoparticles and Nafion film modified Glassy Carbon electrodes were studied by cyclic voltammetry. The microscopic network structure of Nafion provides so much scope that Au nanoparticles can infiltrate into it to enhance ionic and electronic conduction and makes them nanosized. Gold nanoparticles possess extreme small size, a high surface-to-volume ratio and high electrocatalytic activity towards the reduction of methyl parathion. The experimental parameters were optimized, and square wave voltammetry for determining methyl parathion was developed. The irreversible reduction peak current of methyl parathion was proportional to the concentration of methyl parathion over the range of 5.0 × 10 −7 to 1.2 × 10 −4 M with the detection limit of 1.0 × 10 −7 M. The presented method was applied to determining methyl parathion in real samples of water and different vegetables. The sensors for methyl parathion exhibit high sensitivity and good reproducibility and are promising for fast, simple, and sensitive analysis of OPs in environmental and biological samples.
