The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Yuri S. Djikaev - One of the best experts on this subject based on the ideXlab platform.

  • Statistico-probabilistic approach to taking account of the vapor depletion in the kinetics of Homogeneous nucleation: a free-molecular regime of droplet growth.
    Journal of Chemical Physics, 2004
    Co-Authors: Alexander P. Grinin, F. M. Kuni, Yuri S. Djikaev
    Abstract:

    We propose a statistico-probabilistic approach to investigate the process of Homogeneous Formation of droplets in a vapor phase in the presence of an already formed and growing droplet under free-molecular regime of droplet growth after the instantaneous creation of initial vapor supersaturation. We find the probability density for the Formation of a new, nearest (neighbor) droplet in the vicinity of an initially formed droplet. The mean distance between two neighboring droplets is also determined, as well as the average time lag for the Formation of the nearest (neighbor) droplet; the latter quantity serves as an estimate for the duration of the nucleation stage. An estimate for the average number of droplets forming in unit volume by the end of the nucleation stage is also given. Our results are compared with the predictions of classical nucleation theory which assumes the density uniformity of a metastable phase. Where the proposed appoach is applicable, there is observed qualitative agreement between ...

  • statistico probabilistic approach to taking account of the vapor depletion in the kinetics of Homogeneous nucleation a free molecular regime of droplet growth
    Journal of Chemical Physics, 2004
    Co-Authors: Alexander P. Grinin, F. M. Kuni, Yuri S. Djikaev
    Abstract:

    We propose a statistico-probabilistic approach to investigate the process of Homogeneous Formation of droplets in a vapor phase in the presence of an already formed and growing droplet under free-molecular regime of droplet growth after the instantaneous creation of initial vapor supersaturation. We find the probability density for the Formation of a new, nearest (neighbor) droplet in the vicinity of an initially formed droplet. The mean distance between two neighboring droplets is also determined, as well as the average time lag for the Formation of the nearest (neighbor) droplet; the latter quantity serves as an estimate for the duration of the nucleation stage. An estimate for the average number of droplets forming in unit volume by the end of the nucleation stage is also given. Our results are compared with the predictions of classical nucleation theory which assumes the density uniformity of a metastable phase. Where the proposed appoach is applicable, there is observed qualitative agreement between the results. The underlying cause of this agreement is analyzed and the limits of applicability of the uniformity approximation are clarified.

Qiqing Zhang - One of the best experts on this subject based on the ideXlab platform.

  • biomimetic mineralization on natural and synthetic polymers to prepare hybrid scaffolds for bone tissue engineering
    Colloids and Surfaces B: Biointerfaces, 2019
    Co-Authors: Lin Zou, Jingdi Chen, Qiqing Zhang, Yujue Zhang, Xiaocui Liu
    Abstract:

    Abstract To mimic the mineral component and the microstructure of natural bone, nanohydroxyapatite (nHAP)/polymer (natural and synthetic materials) composite scaffolds with micropore structures and good mechanical performance were prepared via the assistance of sonication and amidation. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) showed the biomimetic Homogeneous Formation of nHAP in the polymer matrix. Fourier transform infrared spectroscopy (FTIR) indicated that the polymer matrix regulated the crystallization of nHAP. The integration of synthetic/natural polymers benefited nHAP crystallization in the polymer matrix and thus improved the mechanical performance of the chitosan (CS)/collagen (Col)/ poly (lactic acid) (PLA)/nHAP scaffolds. The in vitro bioactivity ability was investigated by incubating in a simulated body fluid (SBF). The methyl thiazolyl tetrazolium (MTT) test, the acridine orange/ethidium bromide (AO/EB) and Giemsa staining showed that the scaffolds had good biocompatibility and could maintain the cell growth. Therefore, the CS/Col/PLA/nHAP scaffold is promising for bone tissue engineering applications.

  • preparation and biocompatibility of nanohybrid scaffolds by in situ Homogeneous Formation of nano hydroxyapatite from biopolymer polyelectrolyte complex for bone repair applications
    Colloids and Surfaces B: Biointerfaces, 2012
    Co-Authors: Jingdi Chen, Guodong Zhang, Shen Yang, Qiqing Zhang
    Abstract:

    The achievement of nano distribution for inorganic reinforced filler is a big challenge to three-dimensional porous composite scaffolds. In this paper, a Homogeneous nano hydroxyapatite/polyelectrolyte complex (HAP/PEC) hybrid scaffold was developed and investigated. Based on the enhancing properties of the Formation of PEC between chitosan and hyaluronic acid, the introduction of nano HAP via in situ crystallization from the PEC achieved nano distribution in the PEC matrix and supplied nano topographies of extracellular environments for the nanohybrid scaffold. The biocompatibility and bioactivity were evaluated by Human bone mesenchymal stem cells (hBMSCs) proliferation (MTT assay), maturation (alkaline phosphatase (ALP) activity) and histological analysis. The in vitro tests show the scaffold is excellent for cell penetration, growth, and proliferation and it is promising for bone repair application.

Alexander P. Grinin - One of the best experts on this subject based on the ideXlab platform.

  • Statistico-probabilistic approach to taking account of the vapor depletion in the kinetics of Homogeneous nucleation: a free-molecular regime of droplet growth.
    Journal of Chemical Physics, 2004
    Co-Authors: Alexander P. Grinin, F. M. Kuni, Yuri S. Djikaev
    Abstract:

    We propose a statistico-probabilistic approach to investigate the process of Homogeneous Formation of droplets in a vapor phase in the presence of an already formed and growing droplet under free-molecular regime of droplet growth after the instantaneous creation of initial vapor supersaturation. We find the probability density for the Formation of a new, nearest (neighbor) droplet in the vicinity of an initially formed droplet. The mean distance between two neighboring droplets is also determined, as well as the average time lag for the Formation of the nearest (neighbor) droplet; the latter quantity serves as an estimate for the duration of the nucleation stage. An estimate for the average number of droplets forming in unit volume by the end of the nucleation stage is also given. Our results are compared with the predictions of classical nucleation theory which assumes the density uniformity of a metastable phase. Where the proposed appoach is applicable, there is observed qualitative agreement between ...

  • statistico probabilistic approach to taking account of the vapor depletion in the kinetics of Homogeneous nucleation a free molecular regime of droplet growth
    Journal of Chemical Physics, 2004
    Co-Authors: Alexander P. Grinin, F. M. Kuni, Yuri S. Djikaev
    Abstract:

    We propose a statistico-probabilistic approach to investigate the process of Homogeneous Formation of droplets in a vapor phase in the presence of an already formed and growing droplet under free-molecular regime of droplet growth after the instantaneous creation of initial vapor supersaturation. We find the probability density for the Formation of a new, nearest (neighbor) droplet in the vicinity of an initially formed droplet. The mean distance between two neighboring droplets is also determined, as well as the average time lag for the Formation of the nearest (neighbor) droplet; the latter quantity serves as an estimate for the duration of the nucleation stage. An estimate for the average number of droplets forming in unit volume by the end of the nucleation stage is also given. Our results are compared with the predictions of classical nucleation theory which assumes the density uniformity of a metastable phase. Where the proposed appoach is applicable, there is observed qualitative agreement between the results. The underlying cause of this agreement is analyzed and the limits of applicability of the uniformity approximation are clarified.

Frédéric Guittard - One of the best experts on this subject based on the ideXlab platform.

F. M. Kuni - One of the best experts on this subject based on the ideXlab platform.

  • Statistico-probabilistic approach to taking account of the vapor depletion in the kinetics of Homogeneous nucleation: a free-molecular regime of droplet growth.
    Journal of Chemical Physics, 2004
    Co-Authors: Alexander P. Grinin, F. M. Kuni, Yuri S. Djikaev
    Abstract:

    We propose a statistico-probabilistic approach to investigate the process of Homogeneous Formation of droplets in a vapor phase in the presence of an already formed and growing droplet under free-molecular regime of droplet growth after the instantaneous creation of initial vapor supersaturation. We find the probability density for the Formation of a new, nearest (neighbor) droplet in the vicinity of an initially formed droplet. The mean distance between two neighboring droplets is also determined, as well as the average time lag for the Formation of the nearest (neighbor) droplet; the latter quantity serves as an estimate for the duration of the nucleation stage. An estimate for the average number of droplets forming in unit volume by the end of the nucleation stage is also given. Our results are compared with the predictions of classical nucleation theory which assumes the density uniformity of a metastable phase. Where the proposed appoach is applicable, there is observed qualitative agreement between ...

  • statistico probabilistic approach to taking account of the vapor depletion in the kinetics of Homogeneous nucleation a free molecular regime of droplet growth
    Journal of Chemical Physics, 2004
    Co-Authors: Alexander P. Grinin, F. M. Kuni, Yuri S. Djikaev
    Abstract:

    We propose a statistico-probabilistic approach to investigate the process of Homogeneous Formation of droplets in a vapor phase in the presence of an already formed and growing droplet under free-molecular regime of droplet growth after the instantaneous creation of initial vapor supersaturation. We find the probability density for the Formation of a new, nearest (neighbor) droplet in the vicinity of an initially formed droplet. The mean distance between two neighboring droplets is also determined, as well as the average time lag for the Formation of the nearest (neighbor) droplet; the latter quantity serves as an estimate for the duration of the nucleation stage. An estimate for the average number of droplets forming in unit volume by the end of the nucleation stage is also given. Our results are compared with the predictions of classical nucleation theory which assumes the density uniformity of a metastable phase. Where the proposed appoach is applicable, there is observed qualitative agreement between the results. The underlying cause of this agreement is analyzed and the limits of applicability of the uniformity approximation are clarified.

  • A Theory of Homogeneous Boiling-Up of Liquid Solutions: 1. Kinetic Equation of Boiling-Up
    Colloid Journal, 2002
    Co-Authors: F. M. Kuni, I. A. Zhuvikina
    Abstract:

    Homogeneous Formation of bubbles of a stable gas phase in a liquid solution is studied. The intermediate (between diffusion and free molecular) regime of molecule exchange between a bubble and the solution is taken into account. A two-dimensional kinetic equation describing the Homogeneous boiling-up of the solution is derived. The variables selected for describing an emerging bubble are shown to be very convenient for studying the resultant equation. One of the variables is thermodynamically stable and rapidly changes with time; on the contrary, the other variable is thermodynamically unstable and slowly changes with time. The mobility of the boundary of an emerging bubble has a merely slight effect on the establishment of the stationary rate of the change in the number of molecules in the bubble; the smallness of this effect is substantiated.