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Adsorbed Amount

The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Yasuhisa Adachi – 1st expert on this subject based on the ideXlab platform

  • yield stress of mixed suspension of silica particles and lysozymes the effect of zeta potential and Adsorbed Amount
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
    Co-Authors: Atsushi Yamaguchi, Motoyoshi Kobayashi, Yasuhisa Adachi

    Abstract:

    Abstract To investigate the interactions between colloidal particles in the presence of oppositely charged proteins, the yield stress of a mixed suspension of silica particles and lysozymes was measured as a function of lysozyme dose and pH. Further, the corresponding surface properties of silica particles covered with lysozymes were determined by measuring the Adsorbed lysozyme Amount and zeta potential. The present results indicated that an increase in the Adsorbed lysozyme Amount increases the zeta potential of silica particles from negative to positive through an isoelectric point. As expected from the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, the maximum value of yield stress is obtained around the isoelectric point and the yield stresses decrease with an increase in the zeta potential magnitude. However, the maximum yield stress depends on the pH, and yield stresses at the same zeta potential magnitude are different depending on the zeta potential sign even if the pH values are similar. That is, the relationship between yield stress and zeta potential is asymmetric with respect to the isoelectric point. These asymmetric results of the yield stress indicate the existence of non-DLVO forces, such as patch-bridging attraction and lateral repulsion between Adsorbed lysozymes, affected by the Adsorbed Amount of lysozyme. Our analysis suggested that the relative Adsorbed Amount, defined as the ratio of the Adsorbed Amount to the maximum Adsorbed Amount, can be used as a parameter to explain the asymmetric feature of the yield stress with respect to the zeta potential. In addition to the zeta potential, the surface occupation of Adsorbed substances is critical in controlling particle–particle interactions.

Don M Zebolsky – 2nd expert on this subject based on the ideXlab platform

  • investigation of quantitative relationship between Adsorbed Amount of solute and solvent concentration at relatively high solute con centration by frontal analysis in rplc
    Chinese Journal of Chemistry, 2010
    Co-Authors: Yan Wang, Xindu Geng, Don M Zebolsky

    Abstract:

    In previous paper a new adsorption isotherm which relates the Amount of solute absorbed to the solvent concentration is pro-posed and simplified, and it only can be used at lower solute concentration. In this article the scope of the new adsorption isotherm is extended and the expressions with three and four parameters are obtained. The equations with multi-parameters are valid when the Adsorbed mounts are larger and show non-linear logarithmic relationships. Tests with a homologue of are-matic alcohols by frontal analysis in reversed phase liquid chro-matography demonstrate that the experimental results fit those equations well. In addition, the predicted values by the multi-parameters were found to fit the experimental values well also. The parameters have physical meaning only for the two-param-eter equation for the aromatic alcohols.

  • quantitative relationship between Adsorbed Amount of solute and solvent composition
    Thermochimica Acta, 2003
    Co-Authors: Yan Wang, Xindu Geng, Don M Zebolsky

    Abstract:

    Abstract A new adsorption isotherm that relates the Amount of solute Adsorbed to the solvent concentration is proposed. The new equation is derived from Geng and Shi’s stoichiometric displacement model for adsorption (SDM-A). The obtained equation may be simplified to an expression containing two parameters. The equation with two parameters, valid for low concentrations of solute, is a logarithmically linear relationship. The intercept contains a thermodynamic equilibrium constant of the solute displacing solvent from the adsorbent. The slope is the negative value of the stoichiometric displacement parameter (Z), the average total number of solvent molecules displaced from an active site on the adsorbent and from the solute. Tests with a homologous series of aromatic alcohols by frontal analysis in reversed phase liquid chromatography demonstrate that experimental results fit the equation well.

Atsushi Yamaguchi – 3rd expert on this subject based on the ideXlab platform

  • yield stress of mixed suspension of silica particles and lysozymes the effect of zeta potential and Adsorbed Amount
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
    Co-Authors: Atsushi Yamaguchi, Motoyoshi Kobayashi, Yasuhisa Adachi

    Abstract:

    Abstract To investigate the interactions between colloidal particles in the presence of oppositely charged proteins, the yield stress of a mixed suspension of silica particles and lysozymes was measured as a function of lysozyme dose and pH. Further, the corresponding surface properties of silica particles covered with lysozymes were determined by measuring the Adsorbed lysozyme Amount and zeta potential. The present results indicated that an increase in the Adsorbed lysozyme Amount increases the zeta potential of silica particles from negative to positive through an isoelectric point. As expected from the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory, the maximum value of yield stress is obtained around the isoelectric point and the yield stresses decrease with an increase in the zeta potential magnitude. However, the maximum yield stress depends on the pH, and yield stresses at the same zeta potential magnitude are different depending on the zeta potential sign even if the pH values are similar. That is, the relationship between yield stress and zeta potential is asymmetric with respect to the isoelectric point. These asymmetric results of the yield stress indicate the existence of non-DLVO forces, such as patch-bridging attraction and lateral repulsion between Adsorbed lysozymes, affected by the Adsorbed Amount of lysozyme. Our analysis suggested that the relative Adsorbed Amount, defined as the ratio of the Adsorbed Amount to the maximum Adsorbed Amount, can be used as a parameter to explain the asymmetric feature of the yield stress with respect to the zeta potential. In addition to the zeta potential, the surface occupation of Adsorbed substances is critical in controlling particle–particle interactions.

  • Charging and aggregation behavior of silica particles in the presence of lysozymes
    Colloid and Polymer Science, 2017
    Co-Authors: Yi Huang, Atsushi Yamaguchi, Tien Duc Pham, Motoyoshi Kobayashi

    Abstract:

    To gain insight into the colloidal stability in the presence of proteins, we measured the electrophoretic mobility and aggregation rate constant of silica particles coated with lysozymes, and the Adsorbed Amount of lysozymes on the silica. We also examined model analyses, which are based on the Derjaguin, Landau, Verwey, and Overbeek theory with the effect of charge heterogeneity, to discuss the aggregation of lysozyme-coated silica. Our results show that lysozymes enhance the aggregation of silica when the lysozyme-coated silica is near the isoelectric point. When the Adsorbed Amount of lysozyme is low, the effect of charge-patch attractive force promotes the aggregation of silica. The effect of charge heterogeneity weakens with the increase of Adsorbed Amount of lysozyme. Our model which takes account of the effect of charge heterogeneity can capture the trend of the aggregation of silica in the presence of lysozyme qualitatively, but there are also large quantitative discrepancies between the theoretical prediction and experimental results. Further improvement is required to describe realistic charge heterogeneity and the effect of the surface coverage of lysozyme on the silica.