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  • 1
    Electronic Resource
    Electronic Resource
    Soft X-ray spectromicroscopy on solid-stabilized emulsions (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 719-726 
    Details
    ISSN: 1435-1536
    Keywords: Key words Layered double hydroxide ; Montmorillonite ; Pickering emulsions ; Soft X-ray spectromicroscopy ; Solid-stabilized emulsions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oil–water emulsions stabilized by solids have been imaged with sub-100 nm spatial resolution and analyzed spectroscopically using a scanning transmission X-ray microscope. The emulsions are stabilized by particle heterocoagulate cages surrounding the oil droplets. These cages form due to the interaction of negatively charged clay mineral particles (sodium montmorillonite, Wyoming) and positively charged particles of calcium/aluminum layered double hydroxide (LDH). The emulsions were studied at atmospheric pressure, without any pretreatment using carbon K and calcium L X-ray absorption edges. Oil- and calcium-rich LDH were separately mapped, and the clay mineral dispersions were also imaged. Applying X-ray absorption-edge contrast, oil could be distinguished from water in the emulsion near the carbon K absorption edge (284 eV, 4.4 nm). Spectromicroscopy near the calcium L absorption edge (346 eV, 3.6 nm) allowed the structural details of heterocoagulate formation to be revealed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050445
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  • 2
    Electronic Resource
    Electronic Resource
    Stabilization of emulsions by heterocoagulation of clay minerals and layered double hydroxides (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 730-737 
    Details
    ISSN: 1435-1536
    Keywords: Key words Aluminum magnesium hydroxide ; antithixotropy ; bentonite ; emulsions ; montmorillonite ; Pickering emulsions ; layered double hydroxide ; solid stabilized emulsions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  Paraffin/water emulsions were stabilized by colloidal particles without surface active agents. Mixtures of two types of particles with opposite signs of charge were used: a layered double hydroxide (the hydroxide layers carry positive charges) and the clay mineral montmorillonite (the silicate layers carry negative charges). The emulsions were very stable and did not separate a coherent oil phase. The stability of the emulsion (no oil coalescence after centrifugation) was independent of the mixing ratio of both the compounds when the total solid content was 〉0.5%. Solid contents up to 2.0% were optimal. In contrast to stability, flow behavior of the emulsion was dependent on the mass fraction χ of the hydroxide. The maxima of viscosity and yield value were observed at χ≈0.2–0.3; the emulsion showed pronounced antithixotropic behavior. Weak thixotropic properties, smaller viscosities and yield values were observed at χ≤0.2 and ≥0.5. In the absence of the clay mineral, the double hydroxide particles stabilize by forming envelopes around the oil droplets. Addition of bentonites creates a three-dimensional network of particles with high elasticity which impedes coalescence of the oil droplets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050303
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Aggregation in Pickering emulsions (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 257-260 
    Details
    ISSN: 1435-1536
    Keywords: Key words Bentonite ; Hydrotalcites ; Layered double hydroxides ; Pickering emulsions ; X-ray microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract For the first time, the particle distribution and aggregation in Pickering emulsions were made visible by transmission X-ray microscopy. Oil/water emulsions were stabilized by heterocoagulates of a clay mineral and magnesium aluminum hydroxide. Stability is optimum when the particles surround the oil droplets and also assemble to form a network extending through the coherent phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00013752
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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