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  • 1
    Electronic Resource
    Electronic Resource
    Salt penetration into electrical double layers (1992)
    s.l. : American Chemical Society
    Langmuir 8 (1992), S. 2778-2780 
    Details
    ISSN: 1520-5827
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/la00047a032
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A theoretical and experimental study of forces between charged mica surfaces in aqueous CaCl2 solutions (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 4399-4407 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interaction between two mica surfaces immersed in CaCl2 solutions has been directly measured. Accurate theoretical calculations, including the anisotropic hypernetted chain (HNC) theory used in this work, predict that at reasonably high surface charge densities the electrical double layer interactions in the presence of divalent counterions should be attractive at short surface separations (in the range 0.6–2 nm). Under most conditions investigated, the experimental results indicate that this indeed is the case. The attraction is a consequence of the correlation between the ions. In addition to the double layer interaction, in most cases the measured force contains an oscillatory contribution. At low CaCl2 concentrations and small surface separations, Ca2+ ions between the surfaces are exchanged for H3O+ ions, which decreases the oscillatory interaction and the ion-correlation attraction. At high concentrations the force is dominated by a strong hydration repulsion, which is related to the adoration of Ca2+ ions onto the mica surface. These complications are not considered in the theoretical treatment—which uses the primitive model for the electrolyte—but the ion-correlation attraction is sufficiently prominent to be detected by surface force measurements. The accuracy of the anisotropic HNC theory for 2:1 electrolytes in the primitive model has been checked by comparing calculated ionic concentration profiles with those obtained by Monte Carlo simulations for identical systems. The agreement is excellent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457750
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Permeability of Porous Media (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 387-388 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Childs and Collis-George2 proposed a theory wherein flow is determined by the pore radii and by the probability of continuity of pores of different radii in adjacent planes. Marshall3 greatly facilitated computation by using arbitrary equal volume components of the porosity. Both these approaches ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/183387a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Crystalline Swelling of Montmorillonite: Use of Electrolytes to Control Swelling (1954)
    [s.l.] : Nature Publishing Group
    Nature 173 (1954), S. 255-256 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] HOFMANN, ENDELL AND WILM1 first demonstrated that montmorillonite had a layer structure similar to mica but differed from it in that the interlayer distance was variable and dependent on water content. Many workers2"6 have since verified this one-dimensional crystalline swelling and have shown that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/173255a0
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  • 5
    Electronic Resource
    Electronic Resource
    Swelling of Clay–Water Systems (1959)
    [s.l.] : Nature Publishing Group
    Nature 183 (1959), S. 1752-1753 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In a series of papers, Bolt et al.l~z have reported film thicknesses for clays saturated with sodium or calcium ions. Their results have been obtained in the main by the drying of clay materials from the gel state. Croney and Coleman4 and also Holmes5 have clearly demonstrated that in order to ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1831752a0
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  • 6
    Electronic Resource
    Electronic Resource
    Role of Polysaccharides in Stabilization of Natural Soil Aggregates (1961)
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1283-1284 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] IT is well known that polysaccharide and polyuron-ide materials are generally present in soils1-3, and that in sufficient concentration they are particularly effective in causing aggregation4'5. The amounts normally present in soils are small6. They are, however, more strongly adsorbed by clay than ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1911283a0
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  • 7
    Electronic Resource
    Electronic Resource
    Diffusion of Potassium from Mica-like Clay Minerals (1967)
    [s.l.] : Nature Publishing Group
    Nature 213 (1967), S. 1156-1157 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have conducted a number of experiments on the rate of release of potassium from the fraction of Fithian illite (API 35) less than 2 micron, and an illite from Tumut, New South Wales, supplied by Dr. K. Norrish. The potassium contents of these micas are respectively 4-7 and 7-4 per cent. Samples ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2131156a0
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  • 8
    Electronic Resource
    Electronic Resource
    Role of Iron Oxides in the Bonding of Soil Particles (1964)
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 107-108 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Air-dry aggregates 1.0-2.0 mm in size from samples of Buchanan?s laterite from Kerala, Southern India, a Krasnozem from northern New South Wales, various Rendzinas, Terra Rossas and Red Brown Earths from South Australia and a Lateritic Red Earth from Katherine. North Australia, were separated by ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/201107b0
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  • 9
    Electronic Resource
    Electronic Resource
    Specific Adsorption of Anions (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 1459-1461 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The specific adsorption of anions depends on the pK values of the anion acids. The adsorbed anions confer a negative charge on the surface displacing the zero point of charge to lower pH ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2151459a0
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  • 10
    Electronic Resource
    Electronic Resource
    The nature of "contact" in measuring the forces between muscovite surfaces (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 3300-3301 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100161a061
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