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  • 1
    Electronic Resource
    Electronic Resource
    Differential pulse voltammetric determination of cobalt with a perfluorinated sulfonated polymer-2,2-bipyridyl modified carbon paste electrode (1991)
    s.l. : American Chemical Society
    Analytical chemistry 63 (1991), S. 953-957 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00010a004
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  • 2
    Electronic Resource
    Electronic Resource
    All-solid-state sodium-selective electrode based on a calixarene ionophore in a poly(vinyl chloride) membrane with a polypyrrole solid contact (1992)
    s.l. : American Chemical Society
    Analytical chemistry 64 (1992), S. 2496-2501 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00045a007
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  • 3
    Electronic Resource
    Electronic Resource
    Bright-blue electroluminescence from a silyl-substituted ter-(phenylene–vinylene) derivative (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 865-867 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A bright-blue electroluminescent device has been fabricated by using an emissive dopant and an electron-transporting host. The dopant was a highly photoluminescent silyl-substituted ter-(phenylene–vinylene) derivative [1,4-bis[4-(2-trimethylsilylvinly) styryl]-2,5-dibutoxybenzene (BTSB)]. BTSB was doped into a trimer of N-arylbenzimidazoles (TPBI) which functioned as the host and electron transporter. N,N′-bis-(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4-4′-diamine (NPB) was used as the hole transporter. The device, with a structure of indium tin oxide(backward-slash)NPB(backward-slash)TPBI:10%BTSB(backward-slash)TPBI(backward-slash)Mg:Ag, shows a bright blue emission of 11000 cd/m2 at a current density of 360 mA/cm2. The current efficiency of this device is about 3.2 cd/A at 20 mA/cm2. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123392
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  • 4
    Electronic Resource
    Electronic Resource
    Polymer electrolytes based on acrylonitrile-butadiene-styrene copolymer (1999)
    Springer
    Journal of solid state electrochemistry 3 (1999), S. 387-391 
    Details
    ISSN: 1433-0768
    Keywords: Key words Ion conductivity ; Polymer electrolyte ; Interface
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract One of the approaches to improving the ionic conductivity and the mechanical strength of a solid polymer electrolyte is to use polymers in modified forms, such as polymer blends, copolymers and cross-linked polymers. In this study, a new polymer electrolyte based on the acrylonitrile-butadiene-styrene (ABS) copolymer has been prepared. The ionic conductivity, electrochemical stability and interfacial characteristics of the polymer electrolyte in contact with a lithium electrode have been investigated. The temperature dependence of the conductivity below 20 °C can be described by the Arrhenius equation, and above 20 °C by the VTF equation. Lithium passivation appeared to have taken place in the system. The conductivity and electrochemical characteristics of the system are somewhat similar to those of PAN-based polymer electrolytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100080050171
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  • 5
    Electronic Resource
    Electronic Resource
    A real-time self-tuning web tension regulation scheme (1996)
    Springer
    Real-time systems 11 (1996), S. 265-287 
    Details
    ISSN: 1573-1383
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A self-tuning control scheme is proposed for tension regulation in a web transport system. A computationally efficient self-tuning method is first described. The frequency domain model of the plant is then described. Simulations of the on-line tuning are presented. The paper closes with a discussion of cognizant real-time implementation issues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337682
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  • 6
    Electronic Resource
    Electronic Resource
    Adsorptive stripping voltammetric determination of traces of molybdenum in natural water in the presence ofα-benzoinoxime (1996)
    Springer
    Microchimica acta 124 (1996), S. 211-218 
    Details
    ISSN: 1436-5073
    Keywords: adsorptive stripping voltammetry ; α-benzoinoxime ; molybdenum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrochemical behavior of the molybdenum complex of α-benzoinoxime was investigated using cyclic voltammetry and linear scan voltammetry, after adsorptive accumulation of the complex onto a hanging mercury drop electrode (HMDE). The signal corresponds to the reduction of molybdenum in the complex adsorbed at the HMDE surface. Under optimal conditions, the adsorptive stripping voltammetric procedure gave an extremely low detection limit of 0.1 nM (9.6ng/l) Mo(VI) following stirred accumulation for 5 min at 0.0 V (vs. Ag/AgCl). The reduction cur rent-[Mo(VI)] relationships were linear up to 25 and 100 nM. Repetitive determinations of 10 nM solutions gave relative standard deviations of 2.2 and 3.5%, for 1 and 5-min accumulation periods, respectively. Most of the ions investigated did not interfere with the determination of molybdenum, except for tungsten. Excellent selectivity against copper was observed. The proposed procedure was applied to the direct determination of molybdenum in natural water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01242818
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  • 7
    Electronic Resource
    Electronic Resource
    Electrochemical sensor of nitrite based on an inorganic film modified glassy carbon electrode (1993)
    Springer
    Microchimica acta 111 (1993), S. 63-70 
    Details
    ISSN: 1436-5073
    Keywords: chemically modified electrode ; electrochemical sensor ; flow injection analysis ; nitrite ; heptacyanonitrosylferrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The electrocatalysis of nitrite in solutions at an inorganic film modified glassy carbon electrode was studied. The modifier was an electrodeposited thin inorganic film of the copper-heptacyanonitrosylferrate (CuHNF). Cyclic voltammetry of the modified electrode in a nitrite solution revealed that both oxidation and reduction of nitrite were catalyzed and the electrocatalytic currents were controlled by the diffusion of nitrite. Voltammetric and amperometric responses were investigated. When applied as an amperometric sensor in a flow injection system, the modified electrode permitted detection at — 0.55 V, over 500 mV lower than at the naked electrode surface. A linear response range extending from 1 × 10−6 to 1 × 10−3 M nitrite was obtained, with a detection limit of 3 × 10−7 M. The relative standard deviation for 50 repetitive injections with a 5 × 10−5 M nitrite solution was less than 4%. The procedure was applied to the determination of nitrite in saliva and nitrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01240168
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  • 8
    Electronic Resource
    Electronic Resource
    Voltammetric determination of traces of cobalt(II) with a chemically modified carbon paste electrode (1991)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 339 (1991), S. 137-141 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A new preconcentration and voltammetric determination method for cobalt(II) in aqueous solution with a chemically modified electrode is proposed. The accumulation behaviour and voltammetry of cobalt(II) has been investigated with a carbon paste electrode modified with cationexchanger and 1,10-phenanthroline. The electrochemical response is characterized with respect to carbon paste composition, pH, preconcentration time, cobalt(II) concentration and other variables. For a 3-min preconcentration time, the electrode gives good linearity for 1×10−7 to 4×10−6 mol/l Co(II), a detection limit of 8×10−8 mol/l. The response can be reproduced with a 4.0% relative standard deviation. The method is fairly free from many coexisting ions interferences. A rapid and convenient renewal procedure allows the use of a single electrode in multiple analytical determinations over several days. Satisfactory results are obtained for the determination of cobalt in a variety of certified standard reference materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324399
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  • 9
    Electronic Resource
    Electronic Resource
    The enhancement effect of surfactants in single-sweep polarography of the palladium-dimethylglyoxime complex (1989)
    Weinheim : Wiley-Blackwell
    Electroanalysis 1 (1989), S. 371-374 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A rapid, sensitive, selective single-sweep polarographic method for the determination of palladium based on the reduction of palladium(II) in the Pd(II)-dimethylglyoxime (DMG) complex is described. In weakly acidic media, Pd(II) reacts with DMG and forms a yellow precipitate. After adding a low concentration of the anionic surfactant SDBS (sodium dodecylbenzenesulfonate), the solubility of the complex increases remarkably, and the sensitivity of the determination increases more than fivefold. The solution is stable for at least 3 hours. The complex is strongly adsorbed on the surface of the mercury electrode. The enhancement effect of the surfactant is ascribed to the “synergistic adsorption” of the complex and the surfactant. The current is caused by the reduction of palladium in the complex at -0.45 V (versus SCE). The method can be used to determine trace amounts of palladium over the range of 4 × 10-8 to 4 × 10-6. Assays of palladium catalysts and waste water samples are illustrated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140010416
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  • 10
    Electronic Resource
    Electronic Resource
    Polarographic studies and measurements of nitrite in cobalt(II) - thiocyanate - ascorbic acid solution (1992)
    Weinheim : Wiley-Blackwell
    Electroanalysis 4 (1992), S. 199-206 
    Details
    ISSN: 1040-0397
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In the cobalt(II) - thiocyanate - ascorbic acid solution (pH = 2.0), nitrite can form a ternary complex (CoSCNNO)+, which can be reduced at mercury electrode to -0.59 V (vs. SCE). The wave can be used for the polarographic determination of traces of nitrite in the concentration range of 1 × 10-8 -8 × 10-7 M (single sweep polarography), 1 × 10-7 -4 × 10-5 M (differential pulse polarography). or 1.5 × 10-6 -2 × 10-4 M (direct current polarography). The mechanism of the electrode process is studied by linear sweep voltammetry, DC polarography, cyclic voltammetry, double-step chronocoulometry, and controlled potential coulometry. The polarographic wave is ascribed to the reduction of nitrogen monoxide in the complex to hydroxyamine. The procedure is used for the direct determination of nitrite in various real samples.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elan.1140040210
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