The Experts below are selected from a list of 74892 Experts worldwide ranked by ideXlab platform

Renliang Xu - One of the best experts on this subject based on the ideXlab platform.

  • particle size and zeta potential of Carbon Black in liquid media
    Carbon, 2007
    Co-Authors: Renliang Xu, Chifei Wu, Haiyan Xu
    Abstract:

    Zeta potential is a parameter that can be used for studying and predicting colloid stability and surface morphology. Even though zeta potential measurements have been applied to both aqueous and non-aqueous suspensions, theories for colloidal behavior and zeta potential in non-aqueous media are not as well-established as those in aqueous environments. There are few reports on systematic studies of zeta potential of colloids in liquid media. In the present study, zeta potential and particle size measurements of two Carbon Black powder samples in various media were performed. Combined with particle size characterization, the experimental zeta potential values were used to discuss charge transfer and colloid stability of Carbon Black in suspension.

Haiyan Xu - One of the best experts on this subject based on the ideXlab platform.

  • particle size and zeta potential of Carbon Black in liquid media
    Carbon, 2007
    Co-Authors: Renliang Xu, Chifei Wu, Haiyan Xu
    Abstract:

    Zeta potential is a parameter that can be used for studying and predicting colloid stability and surface morphology. Even though zeta potential measurements have been applied to both aqueous and non-aqueous suspensions, theories for colloidal behavior and zeta potential in non-aqueous media are not as well-established as those in aqueous environments. There are few reports on systematic studies of zeta potential of colloids in liquid media. In the present study, zeta potential and particle size measurements of two Carbon Black powder samples in various media were performed. Combined with particle size characterization, the experimental zeta potential values were used to discuss charge transfer and colloid stability of Carbon Black in suspension.

Nathan S Lewis - One of the best experts on this subject based on the ideXlab platform.

  • chemiresistors for array based vapor sensing using composites of Carbon Black with low volatility organic molecules
    Chemistry of Materials, 2006
    Co-Authors: Marc D Woodka, Bruce S Brunschwig, Nathan S Lewis
    Abstract:

    Chemically sensitive resistors have been fabricated from composites of Carbon Black and low volatility, nonpolymeric, organic molecules such as propyl gallate, lauric acid, and dioctyl phthalate. Sorption of organic vapors into the nonconductive phase of such composites produced rapid and reversible changes in the relative differential resistance response of the sensing films. Arrays of these sensors, in which each sensing film was comprised of Carbon Black and a chemically distinct nonpolymeric organic molecule or blend of organic molecules, produced characteristic response patterns upon exposure to a series of different organic test vapors. The use of nonpolymeric sorption phases allowed fabrication of sensors having a high density of randomly oriented functional groups and provided excellent discrimination between analytes. By comparison to Carbon Black−polymer composite vapor sensors and sensor arrays, such sensors provided comparable detection limits as well as enhanced clustering and enhanced resolu...

  • relationships among resonant frequency changes on a coated quartz crystal microbalance thickness changes and resistance responses of polymer Carbon Black composite chemiresistors
    Analytical Chemistry, 2000
    Co-Authors: Erik J Severin, Nathan S Lewis
    Abstract:

    The relationships among frequency changes on a film-coated quartz crystal microbalance, thickness changes, and dc resistance changes have been investigated for Carbon Black−insulating polymer composite vapor detectors. Quartz crystal microbalance (QCM) measurements and ellipsometry measurements have been performed simultaneously on polymer films that do not contain Carbon Black filler to relate the QCM frequency change and the ellipsometrically determined thickness change to the analyte concentration in the vapor phase. In addition, quartz crystal microbalance measurements and dc resistance measurements on Carbon Black composites of these same polymers have been performed simultaneously to relate the QCM frequency change and dc electrical resistance response to the analyte concentration in the vapor phase. The data indicate that the dc resistance change is directly relatable to the thickness change of the polymers and that a variety of analytes that produce a given thickness change produce a constant resistance change for each member of the test set of polymers investigated in this work.

  • an investigation of the concentration dependence and response to analyte mixtures of Carbon Black insulating organic polymer composite vapor detectors
    Analytical Chemistry, 2000
    Co-Authors: Erik J Severin, Brett J Doleman, Nathan S Lewis
    Abstract:

    The responses relative to an air background of Carbon Black/polymer composite vapor detectors have been determined as a function of the concentration of a homologous series of alcohols (n-CnH2n+1OH, 1 ≤ n ≤ 8), a homologous series of alkanes (n-CnH2n+2, 5 ≤ n ≤ 10 and n = 12, 14), and a set of diverse solvent vapors. In all cases, the steady-state relative differential resistance responses, ΔR/Rb, of the Carbon Black/polymer composite vapor detectors were well-described by a linear relationship with respect to the analyte partial pressure, at least over the tested concentration range (P/P° = 0.005−0.03, where P° is the vapor pressure of the analyte). When two vapors in air were simultaneously presented to the detectors, the ΔR/Rb response, relative to an air background, was the sum of the ΔR/Rb values obtained when each analyte was exposed separately to the Carbon Black/polymer composite detectors under study. Similarly, when an analyte was exposed to the detectors on top of a background level of another ...

Volke Presse - One of the best experts on this subject based on the ideXlab platform.

  • in situ electrochemical dilatometry of onion like Carbon and Carbon Black
    Journal of The Electrochemical Society, 2012
    Co-Authors: M M Hantel, Volke Presse, Yury Gogotsi, Joh K Mcdonough, Guang Feng, Pete T Cummings, Rainer Kotz
    Abstract:

    High power electrochemical double layer capacitors (also called supercapacitors) rely on highly conductive electrode materials witha large specific surface area, which is easily accessible for ions. Exohedral materials with a large ion-accessible outer surface andlittle or no porosity within the particles are particularly attractive for supercapacitor electrodes because they decrease mass transportlimitations and enable very high charge/discharge rates. This study focuses on the investigation of charge induced expansioneffects of spherical exohedral Carbons, that is, onion-like Carbons (OLC, diameter: 5–7 nm) and Carbon Black (diameter: ≈40 nm).Employing electrochemical in-situ dilatometry we studied the expansion behavior within ±1 V potential window

  • and Carbon Black in situ electrochemical dilatometry of onion like Carbon
    2012
    Co-Authors: M M Hantel, Volke Presse, Joh K Mcdonough, Guang Feng, Pete T Cummings, Yury Gogotsi
    Abstract:

    High power electrochemical double layer capacitors (also called supercapacitors) rely on highly conductive electrode materials witha large specific surface area, which is easily accessible for ions. Exohedral materials with a large ion-accessible outer surface andlittle or no porosity within the particles are particularly attractive for supercapacitor electrodes because they decrease mass transportlimitations and enable very high charge/discharge rates. This study focuses on the investigation of charge induced expansioneffects of spherical exohedral Carbons, that is, onion-like Carbons (OLC, diameter: 5–7 nm) and Carbon Black (diameter: ≈40 nm).Employing electrochemical in-situ dilatometry we studied the expansion behavior within ±1 V potential window

Pete T Cummings - One of the best experts on this subject based on the ideXlab platform.

  • in situ electrochemical dilatometry of onion like Carbon and Carbon Black
    Journal of The Electrochemical Society, 2012
    Co-Authors: M M Hantel, Volke Presse, Yury Gogotsi, Joh K Mcdonough, Guang Feng, Pete T Cummings, Rainer Kotz
    Abstract:

    High power electrochemical double layer capacitors (also called supercapacitors) rely on highly conductive electrode materials witha large specific surface area, which is easily accessible for ions. Exohedral materials with a large ion-accessible outer surface andlittle or no porosity within the particles are particularly attractive for supercapacitor electrodes because they decrease mass transportlimitations and enable very high charge/discharge rates. This study focuses on the investigation of charge induced expansioneffects of spherical exohedral Carbons, that is, onion-like Carbons (OLC, diameter: 5–7 nm) and Carbon Black (diameter: ≈40 nm).Employing electrochemical in-situ dilatometry we studied the expansion behavior within ±1 V potential window

  • and Carbon Black in situ electrochemical dilatometry of onion like Carbon
    2012
    Co-Authors: M M Hantel, Volke Presse, Joh K Mcdonough, Guang Feng, Pete T Cummings, Yury Gogotsi
    Abstract:

    High power electrochemical double layer capacitors (also called supercapacitors) rely on highly conductive electrode materials witha large specific surface area, which is easily accessible for ions. Exohedral materials with a large ion-accessible outer surface andlittle or no porosity within the particles are particularly attractive for supercapacitor electrodes because they decrease mass transportlimitations and enable very high charge/discharge rates. This study focuses on the investigation of charge induced expansioneffects of spherical exohedral Carbons, that is, onion-like Carbons (OLC, diameter: 5–7 nm) and Carbon Black (diameter: ≈40 nm).Employing electrochemical in-situ dilatometry we studied the expansion behavior within ±1 V potential window