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    Wyświetlanie 1-6 z 6
    Tytuł:
    Electrokinetic properties of silica-titania mixed oxide particles dispersed in aqueous solution of C.I. Direct Yellow 142 dye – effects of surfactant and electrolyte presence
    Autorzy:
    Chibowski, Stanisław
    Wiśniewska, Małgorzata
    Wawrzkiewicz, Monika
    Hubicki, Zbigniew
    Goncharuk, Olena
    Powiązania:
    https://bibliotekanauki.pl/articles/1450752.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    silica-titania composite
    mixed oxides
    zeta potential
    solid surface charge density
    dye adsorption
    surfactant effect
    Opis:
    The mixed $SiO_2$-$TiO_2$ oxide obtained by the pyrogenic method with the silica:titanium percentage ratio equal to 20:80 (ST80) was used in the experiments. The influence of azo dye C.I. Direct Yellow 142 (DY) adsorption at the mixed oxide-solution interface on the electrokinetic properties of solid particles was studied. To determine solid surface charge density and zeta potential of examined suspensions the potentiometric titration and Doppler laser electrophoresis techniques were applied. The changes in structure of electrical double layer formed on the mixed oxide surface in the dye presence were specified as a function of DY concentration, inorganic salt addition and surfactant introduction. The effects of surfactant type and its concentration were determined. Three surfactants of different ionic character (anionic SDS, cationic CTAB and nonionic Triton X-100) were used in measurements. The obtained electrokinetic characteristics of ST80 mixed oxide dispersed in aqueous solutions with various adsorbate compositions is essential for such suspensions stability.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 6-13
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated biocarbons obtained from post-fermentation residue as potential adsorbents of organic pollutants from the liquid chase
    Autorzy:
    Nowicki, Piotr
    Gruszczyńska, Karolina
    Urban, Teresa
    Wiśniewska, Małgorzata
    Powiązania:
    https://bibliotekanauki.pl/articles/2146892.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    post-fermentation residue
    activated carbons
    organic dyes adsorption
    electrokinetic properties
    zeta potential
    surface charge density
    Opis:
    A series of new synthetic carbonaceous adsorbents has been prepared via physical and chemical activation of residue of alcoholic fermentation of corn starch. Two different variants of thermal treatment procedure - microwave and conventional heating have been applied for preparing of the activated biocarbons. All the samples under investigation were characterised by elementary analysis, surface area measurements as well as determination of the number of surface functional groups. The electrokinetic properties of examined materials were studied using potentiometric titration and electrophoresis methods, which enabled determination of the surface charge density and zeta potential of activated biocarbon particles. Moreover, sorption properties of the carbonaceous materials towards two organic dyes - methylene blue and malachite green were tested. The final products were activated biocarbons of medium developed surface area ranging from 21 to 879 m2/g, showing acidic character of the surface and various content of surface functional groups. More favourable textural parameters as well as sorption properties toward both organic dyes were revealed by chemically activated samples. The obtained results indicated also considerable effect of adsorbed dye molecules on the structure of electrical double layer formed at the solid/liquid interface.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 2 (Special issue - selected papers conference: Physicochemistry of interfaces - instrumental methods); art. no. 146357
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Badania fazy ciekłej dwufazowych modelowych iłów na granicy plastyczności
    Investigations of the quantity of water of the monomineralic clay-water system at the moisture equal to the plastic limit
    Autorzy:
    Olchawa, A.
    Gorączko, A.
    Ziółkowska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/2074267.pdf
    Data publikacji:
    2014
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    iły monomineralne
    granica plastyczności
    powierzchnia właściwa
    gęstość ładunku powierzchniowego
    monomineralic clays
    plastic limit
    specific surface area
    surface charge density
    Opis:
    The paper presents investigations into the relationship between specific surface area of two monomineralic clays and their plastic limits. Two clays – sodium montmorillonite and calcium kaolinite were used to study. For montmorillonite, the quantity of interlayer water at plastic limit is approximately 30% of water content. The number of the layers of water molecules on the external surface area ne = 13÷14. For kaolinite (i.e. non- -swelling clay minerals which only contain water on external surface area), the number of layers of water molecules on the external surface area ne = 63.
    Źródło:
    Przegląd Geologiczny; 2014, 62, 10/2; 654--56
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Adsorption and electrokinetic studies of sodalite/lithium/poly(acrylic acid) aqueous system
    Autorzy:
    Wiśniewska, Małgorzata
    Franus, Wojciech
    Fijałkowska, Gracja
    Ostolska, Iwona
    Wójcik, Grzegorz
    Nosal-Wiercińska, Agnieszka
    Gościańska, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/1450512.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sodalite
    zeolite from fly ash
    lithium acquisition
    zeta potential
    solid surface charge density
    poly(acrylic acid) adsorption
    mixed adsorbates
    Opis:
    The synthetic zeolite-sodalite obtained by the hydrothermal conversion of fly ash with aqueous sodium hydroxide was used in the experiments. Its adsorption properties in relation to lithium ions were examined. The effects of: solution pH, presence of polymeric substance – poly(acrylic acid) and order of individual adsorbates addition were determined. To specify the binding mechanism of lithium ions on the sodalite surface, besides adsorption experiments, the measurements leading to the solid surface charge density and zeta potential determination, were performed. As a result, the structure of mixed adsorption layer composed of polymer+metal complexes was characterized. The presented study concerns two important issues: management of environmentally harmful wastes such as coal combustion products as well as searching for new sources of lithium and effective methods of its acquisition.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 158-166
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The changing shape of a liquid drop in an electric field
    Autorzy:
    Jayalal, A. A. S. N.
    Wijewardena Gamalath, K. A. I. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/411766.pdf
    Data publikacji:
    2012
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    gęstość ładunku powierzchniowego
    stała dielektryczna
    kąt stożka
    napięcie powierzchniowe
    minimalne pole elektryczne
    surface charge density
    dielectric constant
    cone angle
    surface tension
    minimum electric field
    Opis:
    An approximate extension of the slender body theory was used to determine the static shape of a conically ended dielectric fluid drop in an electric field. Using induced surface charge density, hydrostatic pressure and the surface tension of the liquid with interfacial tension stresses and Maxwell electric stresses, a governing equation was obtained for Spender geometries for the equilibrium configuration and numerically solved for 3D. For an applied electric field, the electric energy on a spherical drop can be maximized in a weak dielectric by increasing the applied electric field. The minimum dielectric constant ratio needed to produce a conical end is 14.5 corresponding to a cone angle 31.25° .There is a sharp increment of the aspect ratio after reaching the threshold value of the applied field strength and the deformation of the fluid drop increases with the increase in dielectric constant of the fluid drop. For a particular dielectric constant ratio, the threshold electric field producing conical interface increases with the increased surface tension of the liquid. The threshold electric field for a water drop is 1.0854×104 units and the corresponding aspect ratio is 15. For the minimum dielectric ratio the cone angle of the drop decreases with applied field making the drop more stable at higher fields.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2012, 3; 24-40
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Small high density lipoprotein subclasses: some of their physico-chemical properties and stability in solution.
    Autorzy:
    Atmeh, Ragheb
    Abd Elrazeq, Issa
    Powiązania:
    https://bibliotekanauki.pl/articles/1041440.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    small high density lipoproteins
    diffusion coefficient
    surface charge
    molecular shape
    coefficient of friction
    stability
    Opis:
    Small high density lipoproteins (SHDL) contribute to the protection from atherosclerosis, but detailed information about their properties is not available yet. We isolated four of the smallest HDL subclasses that contain apoA-I alone, the small lipoprotein A-I (SLpAI), by their separation on gradient polyacrylamide gel followed by electroelution. Their physico-chemical properties were calculated from their displacement in non-denaturing gradient polyacrylamide gel under the effect of electrical potential. The properties are: Stokes' radii 2.96-3.56 nm; molecular masses 42-70 kDa; net negative charge 7.2-13.5; surface charge densities 3139-4069 -esu∙˙cm^(-2); surface potentials 10.6-15.7 -mV; coefficients of friction 5.74-6.90 × 10-8 g∙˙s^(-1); and diffusion coefficients 5.76-6.94 7× 10-7 cm^2∙˙s^(-1). We found that these particles were of low stability as they underwent molecular transformation into larger particles on storage. The estimated dimensions of these particles do not support ellipsoidal shape, therefore, the most probable shape is spherical; consequently, their hydrated characteristics were estimated. We conclude that these particles have high values of negative surface charge and diffusion coefficients, and are of low stability. Their small Stokes' radii were similar to each other and they are spherical and highly hydrated.
    Źródło:
    Acta Biochimica Polonica; 2005, 52, 2; 515-525
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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