The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Seung Jong Lee - One of the best experts on this subject based on the ideXlab platform.

  • Adsorption-stress relationship in drying of silica/PVA suspensions.
    Journal of colloid and interface science, 2011
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kyung Hyun Ahn, Sangki Chun, Seung Jong Lee
    Abstract:

    In this study, we investigated drying process of silica/PVA suspensions. After measuring the amount of Polymer Adsorption and the stress evolution of a film during drying process, we could find a quantitative relationship between Polymer Adsorption and stress development, for silica/PVA suspensions of different pH and mixing time. For all the suspensions of different pH, both the amount of Polymer Adsorption (Γ) and the plateau stress of dry film (σ(p)) could be scaled onto a single master curve as a function of mixing time (t(m)). The scaling of mixing time for both Γ and σ(p) could be performed by the same scale factor, which implies that there is a one to one correlation between Adsorption and stress. This correlation implies that we can control the microstructure and performance of dry film by adjusting the amount of Polymer Adsorption. The origin of Adsorption kinetics of silica/PVA suspension was also discussed in terms of saponification of acetate groups in PVA, which facilitates hydrogen bonding between silica and PVA.

  • The effect of Adsorption kinetics on film formation of silica/PVA suspension
    Journal of colloid and interface science, 2010
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kang-heon Hur, Kyung Hyun Ahn, Seung Jong Lee
    Abstract:

    Particle/binder/solvent systems are widely used in many applications and have long been studied. Understanding and controlling Polymer Adsorption in these complex material systems are important to achieve successful final performance. In this study, the effect of Polymer Adsorption on film formation and the relation between the microstructures of the suspension and film have been investigated by measuring the amount of Polymer Adsorption and the stress development during drying. In terms of mixing (or dispersion) time (t(m)), the Adsorption amount (Gamma(PVA)), characteristic stress (sigma(ch)) and dried film density (rho) showed a similar behavior in the form of 1 - e(t(m)/tau) with a single characteristic time tau = 45 h, which implies that the drying process is determined by this single time constant. The porous and non-uniform microstructure of the dried film at short t(m) became close-packed and uniform with longer t(m). The Polymer Adsorption was found to play a key role in film formation as it introduces steric repulsion in suspension and suppresses the flocculation during solvent evaporation. It was also pointed out that enough mixing time for the saturated Polymer Adsorption is critical to acquire the consolidated and uniform film microstructure.

Sun-hyung Kim - One of the best experts on this subject based on the ideXlab platform.

  • Adsorption-stress relationship in drying of silica/PVA suspensions.
    Journal of colloid and interface science, 2011
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kyung Hyun Ahn, Sangki Chun, Seung Jong Lee
    Abstract:

    In this study, we investigated drying process of silica/PVA suspensions. After measuring the amount of Polymer Adsorption and the stress evolution of a film during drying process, we could find a quantitative relationship between Polymer Adsorption and stress development, for silica/PVA suspensions of different pH and mixing time. For all the suspensions of different pH, both the amount of Polymer Adsorption (Γ) and the plateau stress of dry film (σ(p)) could be scaled onto a single master curve as a function of mixing time (t(m)). The scaling of mixing time for both Γ and σ(p) could be performed by the same scale factor, which implies that there is a one to one correlation between Adsorption and stress. This correlation implies that we can control the microstructure and performance of dry film by adjusting the amount of Polymer Adsorption. The origin of Adsorption kinetics of silica/PVA suspension was also discussed in terms of saponification of acetate groups in PVA, which facilitates hydrogen bonding between silica and PVA.

  • The effect of Adsorption kinetics on film formation of silica/PVA suspension
    Journal of colloid and interface science, 2010
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kang-heon Hur, Kyung Hyun Ahn, Seung Jong Lee
    Abstract:

    Particle/binder/solvent systems are widely used in many applications and have long been studied. Understanding and controlling Polymer Adsorption in these complex material systems are important to achieve successful final performance. In this study, the effect of Polymer Adsorption on film formation and the relation between the microstructures of the suspension and film have been investigated by measuring the amount of Polymer Adsorption and the stress development during drying. In terms of mixing (or dispersion) time (t(m)), the Adsorption amount (Gamma(PVA)), characteristic stress (sigma(ch)) and dried film density (rho) showed a similar behavior in the form of 1 - e(t(m)/tau) with a single characteristic time tau = 45 h, which implies that the drying process is determined by this single time constant. The porous and non-uniform microstructure of the dried film at short t(m) became close-packed and uniform with longer t(m). The Polymer Adsorption was found to play a key role in film formation as it introduces steric repulsion in suspension and suppresses the flocculation during solvent evaporation. It was also pointed out that enough mixing time for the saturated Polymer Adsorption is critical to acquire the consolidated and uniform film microstructure.

Jun Hee Sung - One of the best experts on this subject based on the ideXlab platform.

  • Adsorption-stress relationship in drying of silica/PVA suspensions.
    Journal of colloid and interface science, 2011
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kyung Hyun Ahn, Sangki Chun, Seung Jong Lee
    Abstract:

    In this study, we investigated drying process of silica/PVA suspensions. After measuring the amount of Polymer Adsorption and the stress evolution of a film during drying process, we could find a quantitative relationship between Polymer Adsorption and stress development, for silica/PVA suspensions of different pH and mixing time. For all the suspensions of different pH, both the amount of Polymer Adsorption (Γ) and the plateau stress of dry film (σ(p)) could be scaled onto a single master curve as a function of mixing time (t(m)). The scaling of mixing time for both Γ and σ(p) could be performed by the same scale factor, which implies that there is a one to one correlation between Adsorption and stress. This correlation implies that we can control the microstructure and performance of dry film by adjusting the amount of Polymer Adsorption. The origin of Adsorption kinetics of silica/PVA suspension was also discussed in terms of saponification of acetate groups in PVA, which facilitates hydrogen bonding between silica and PVA.

  • The effect of Adsorption kinetics on film formation of silica/PVA suspension
    Journal of colloid and interface science, 2010
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kang-heon Hur, Kyung Hyun Ahn, Seung Jong Lee
    Abstract:

    Particle/binder/solvent systems are widely used in many applications and have long been studied. Understanding and controlling Polymer Adsorption in these complex material systems are important to achieve successful final performance. In this study, the effect of Polymer Adsorption on film formation and the relation between the microstructures of the suspension and film have been investigated by measuring the amount of Polymer Adsorption and the stress development during drying. In terms of mixing (or dispersion) time (t(m)), the Adsorption amount (Gamma(PVA)), characteristic stress (sigma(ch)) and dried film density (rho) showed a similar behavior in the form of 1 - e(t(m)/tau) with a single characteristic time tau = 45 h, which implies that the drying process is determined by this single time constant. The porous and non-uniform microstructure of the dried film at short t(m) became close-packed and uniform with longer t(m). The Polymer Adsorption was found to play a key role in film formation as it introduces steric repulsion in suspension and suppresses the flocculation during solvent evaporation. It was also pointed out that enough mixing time for the saturated Polymer Adsorption is critical to acquire the consolidated and uniform film microstructure.

Kyung Hyun Ahn - One of the best experts on this subject based on the ideXlab platform.

  • Adsorption-stress relationship in drying of silica/PVA suspensions.
    Journal of colloid and interface science, 2011
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kyung Hyun Ahn, Sangki Chun, Seung Jong Lee
    Abstract:

    In this study, we investigated drying process of silica/PVA suspensions. After measuring the amount of Polymer Adsorption and the stress evolution of a film during drying process, we could find a quantitative relationship between Polymer Adsorption and stress development, for silica/PVA suspensions of different pH and mixing time. For all the suspensions of different pH, both the amount of Polymer Adsorption (Γ) and the plateau stress of dry film (σ(p)) could be scaled onto a single master curve as a function of mixing time (t(m)). The scaling of mixing time for both Γ and σ(p) could be performed by the same scale factor, which implies that there is a one to one correlation between Adsorption and stress. This correlation implies that we can control the microstructure and performance of dry film by adjusting the amount of Polymer Adsorption. The origin of Adsorption kinetics of silica/PVA suspension was also discussed in terms of saponification of acetate groups in PVA, which facilitates hydrogen bonding between silica and PVA.

  • The effect of Adsorption kinetics on film formation of silica/PVA suspension
    Journal of colloid and interface science, 2010
    Co-Authors: Sun-hyung Kim, Jun Hee Sung, Kang-heon Hur, Kyung Hyun Ahn, Seung Jong Lee
    Abstract:

    Particle/binder/solvent systems are widely used in many applications and have long been studied. Understanding and controlling Polymer Adsorption in these complex material systems are important to achieve successful final performance. In this study, the effect of Polymer Adsorption on film formation and the relation between the microstructures of the suspension and film have been investigated by measuring the amount of Polymer Adsorption and the stress development during drying. In terms of mixing (or dispersion) time (t(m)), the Adsorption amount (Gamma(PVA)), characteristic stress (sigma(ch)) and dried film density (rho) showed a similar behavior in the form of 1 - e(t(m)/tau) with a single characteristic time tau = 45 h, which implies that the drying process is determined by this single time constant. The porous and non-uniform microstructure of the dried film at short t(m) became close-packed and uniform with longer t(m). The Polymer Adsorption was found to play a key role in film formation as it introduces steric repulsion in suspension and suppresses the flocculation during solvent evaporation. It was also pointed out that enough mixing time for the saturated Polymer Adsorption is critical to acquire the consolidated and uniform film microstructure.

Steve Granick - One of the best experts on this subject based on the ideXlab platform.

  • Phospholipid membranes as substrates for Polymer Adsorption
    Nature Materials, 2002
    Co-Authors: Anne Feng Xie, Steve Granick
    Abstract:

    A largely unsolved problem in soft materials is how surface reconstruction competes with the rate of Adsorption. Here, supported phospholipid bilayers of DMPC (1,2-dimyristoyl-sn-glycero-3-phosphocholine) were employed as substrates for the Adsorption of a weak polyelectrolyte, polymethacrylic acid, whose time-dependent ratio of charged to uncharged functional groups served to probe the local dielectric environment. Chains that encountered sparsely covered surfaces spread to maximize the number of segment-surface contacts at rates independent of the molar mass (which was varied by a factor of 30), but dependent on the phase of the lipid bilayer, gel or liquid crystal. Surface reconstruction rather than molar mass of the adsorbing molecules seemed to determine the rate of spreading. The significance of these findings is the stark contrast with well-known views of Polymer Adsorption onto surfaces having structures that are 'frozen' and unresponsive, and is relevant not just from biological and biophysical standpoints, but also in the formulation of many cosmetics and pharmaceutical products.