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  • 1. Guillard, F.
    et al.
    Tragardh, C.
    Fuchs, Laszlo
    New image analysis methods for the study of mixing patterns in stirred tanks2000Ingår i: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 78, nr 2, s. 273-285Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A method of treating data acquired with the planar laser-induced fluorescence technique has been developed to visualize the topology of two-dimensional concentration fields and to describe the dynamics of the coherent mixing structures identified; This method is based on a conditional binary transformation of the local concentration data, combined with a joint probability calculation. The methodology has been used to investigate the mixing in a stirred tank, at two injection port locations (in the bulk and in the impeller stream region). With bulk injection, a folding phenomenon of the coherent mixing structure was detected. Away from this port, large-scale spatially periodic motion was identified, with a characteristic time of oscillation of the order of 2 to 3 s. With injection in the impeller stream region, no spatial instabilities of the coherent structure were detected. Local oscillations of the coherent mixing structure were found both on short and long time-scales (i.e., similar to 1 and similar to 80 s).

  • 2.
    Jara, Rory
    et al.
    SI Grp, Proc Technol Grp, Morgantown, WV USA.;West Virginia Univ, Wood Sci & Technol Dept, Morgantown, WV 26506 USA..
    Lawoko, Martin
    KTH, Skolan för kemi, bioteknologi och hälsa (CBH), Fiber- och polymerteknologi.
    van Heiningen, Adriaan
    Univ Maine, 537 Jenness Hall, Orono, ME 04469 USA..
    Intrinsic dissolution kinetics and topochemistry of xylan, mannan, and lignin during auto-hydrolysis of red maple wood meal2019Ingår i: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 97, nr 3, s. 649-661Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    High temperature aqueous treatment of wood is the preferred technology for deconstructing lignocellulosics. Many studies have been carried out on the kinetics and mechanism of hot-water extraction. However, most were performed in batch or integral plug flow reactors, which are not optimal for measuring intrinsic dissolution kinetics of the lignocellulosic components. Therefore, we used a continuous mixed batch reactor (or Berty reactor) to determine the intrinsic dissolution kinetics of xylan, mannan, and lignin from milled hardwood (Acer rubrum) at three different temperatures (150, 160, and 170 degrees C) and four constant pH values: 2, 3, 4, and 5. During the initial phase of autohydrolysis (carbohydrate-free), lignin and (lignin-free) xylan dissolve starting at a high rate and then a slowly decreasing rate, respectively. This is followed by the dissolution of xylan-lignin complexes and finally cellulose xylan complexes when cellulose has been significantly hydrolysed. The kinetics and molecular weight distribution of the removed wood polymers are used to describe the topochemistry of autohydrolysis based on recent knowledge of the ultrastructure of hardwood fibres.

  • 3. Khan, Zaheer Abbas
    et al.
    Kumar, Rachana
    Dutta, Joydeep
    Asian Institute of Technology, Thailand.
    Multilayer thin films of colloidal gold and silica nanoparticles: Effect of polyelectrolyte coating2012Ingår i: Canadian Journal of Chemical Engineering, ISSN 0008-4034, E-ISSN 1939-019X, Vol. 90, nr 4, s. 919-924Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The use of oppositely charged colloidal nanoparticles to build multilayered structures is an approach in thin film science. In this work, uniform spherical nano-dispersions of gold (ca. 20nm) and silica (ca. 30nm) were synthesised with specific volume concentration to achieve colloidal stability. Exploiting the use of self-assembly, multilayers of these oppositely charged nanoparticles were built using alternate coating with chitosan. Gold nanoparticles have strong optical absorption in visible region of electromagnetic spectrum resulting from its surface plasmon resonance. Silica nanoparticles have low refractive index and absorb light mostly in the ultraviolet (UV) region. The optical absorption band of the fabricated thin films extends from UV to visible region of the electromagnetic spectrum. The spectral characteristics of these thin-film assemblies are a combination of thickness and the order of the layers in a stack. These films have potential applications as optical elements and in optoelectronics.

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