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Wyszukujesz frazę ": viscoelasticity" wg kryterium: Temat

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    Wyświetlanie 1-3 z 3
    Tytuł:
    Impact of carrageenan addition on rheological characterisation of some hydrocolloid aqueous solutions during long-lasting agitating with rotational speed changes
    Autorzy:
    Neupauer, Krzysztof
    Kabziński, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/185187.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mixing
    viscoelasticity
    rheology
    hydrocolloids
    mieszanie
    lepkosprężystość
    reologia
    hydrokoloidy
    Opis:
    The paper presents the impact of carrageenan addition on rheological characterisation of some hydrocolloid aqueous solutions during stirring with rotational speed changes. Carboxymethyl cellulose, guar gum and xanthan gum were used. Measurements were conducted in a vessel equipped with an anchor stirrer under rotational speed increase and decrease conditions, equivalent to a hysteresis loop rheological test. Rheological parameters were calculated using the power-law equation. It was found that a carrageenan addition generally causes a reduction of liquid apparent viscosity and time-dependent rheological behaviour intensification, with some exceptions.
    Źródło:
    Chemical and Process Engineering; 2019, 40, 4; 351--360
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rheological scaling properties of starch solutionsin dimethylsulfoxide
    Autorzy:
    Ptaszek, P.
    Ptaszek, A.
    Łukasiewicz, M.
    Grzesik, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/185788.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lepkosprężystość
    model Maxwella
    skrobia
    viscoelasticity
    Maxwell model
    continuous relaxation spectra
    starch
    Opis:
    The possibility of scaling viscoelastic properties of starch solutions in relation to biopolymer concentration was presented in this study. An application of this empirical method enabled to widen the observation horizon of viscoelastic properties. It was also determined that the scope of its applicability is limited by amylose content in the solution. In high amylose solutions, for which up to 40% (w/w) concentration was the highest one obtained, calibration caused the formation of master curve in the widest frequency range. Determined values of scaling coefficients aC changed exponentially in starch concentration function in the solution. For waxy starch solutions of maximum concentration equal to 20% (w/w), scaling did not significantly widen the observation window. Based on master curves constructed in such way, continuous relaxation spectra H([lambda]) were determined using Tikhonov regularisation method. Their structure indicates advantageous of viscous elements in the process of viscoelastic phenomena formation.
    Źródło:
    Chemical and Process Engineering; 2012, 33, 3; 323-333
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and Co-Adsorption of Polyaldehyde Dextran Nanoparticles and Nonionic Surfactant at an Air–Water Interface: Potential Implications for Pulmonary Drug Delivery
    Autorzy:
    Jabłczyńska, K.
    Sosnowski, T. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/184846.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    polysaccharide nanoparticles
    lung surfactant
    dynamic surface tension
    surface viscoelasticity
    hysteresis
    nanocząstki polisacharydowe
    dynamiczne napięcie powierzchniowe
    lepkosprężystość powierzchni
    histereza
    Opis:
    Measurements of dynamic surface tension were carried out in aqueous systems (water or 0.1 mM Triton X-100) comprising nanoparticles formed from chemically modified polyaldehyde dextran (PAD). The nanostructures, considered as potential drug carriers in aerosol therapy, were obtained from biocompatible polysaccharides by successive oxidation and reactive coiling in an aqueous solution. The dynamic surface tension of the samples was determined by the maximum bubble pressure (MBP) method and by the axisymmetric drop shape analysis (ADSA). Experiments with harmonic area perturbations were also carried out in order to determine surface dilatational viscoelasticity. PAD showed a remarkable surface activity. Ward-Tordai equation was used to determine the equilibrium surface tension and diffusion coefficient of PAD nanoparticles (D = 2.3×10-6 m2/s). In a mixture with Triton X-100, PAD particles showed co-adsorption and synergic effect in surface tension reduction at short times (below 10 s). Tested nanoparticles had impact on surface rheology in a mixed system with nonionic surfactant, suggesting their possible interactions with the lung surfactant system after inhalation. This preliminary investigation sets the methodological approach for further research related to the influence of inhaled PAD nanoparticles on the lung surfactant and mass transfer processes in the respiratory system.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 1; 67-77
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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