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  • 1
    Electronic Resource
    Electronic Resource
    Interaction of blockcopolymer micelles as probed by small-angle neutron and by small-angle X-ray scattering (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 1027-1034 
    Details
    ISSN: 1435-1536
    Keywords: Key words Micelles ; block-copolymers ; SAXS ; SANS ; structure factor
    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  The analysis of the interaction of micelles formed by a blockcopolymer is given by means of small-angle X-ray (SAXS) and small-angle neutron scattering (SANS). The blockcopolymer consists of poly(styrene) and poly(ethylene oxide) (molecular weight of each block: 1000 g/mol) and forms well-defined micelles (weight-association number: 400, weight-average diameter: 15.4 nm) in water. The internal structure has been studied previously (Macromolecules 29:4006 (1996)) by SAXS. There it has been shown that the micelles are spherical objects. The structure factor S(q) as a function of the scattering vector q (q=(4π/λ) sin (θ/2); λ: wavelength of the radiation in the medium; θ: scattering angle) can be extracted from both sets of small-angle scattering data (SANS: q≤0.4 nm-1; SAXS: q≤0.6 nm-1). It is shown that particle interaction in the present system can be described by assuming soft interaction which is modeled by a square-step potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050181
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and characterization of well-defined sterically stabilized latex particles with narrow size distribution (1998)
    Springer
    Colloid & polymer science 276 (1998), S. 794-799 
    Details
    ISSN: 1435-1536
    Keywords: Key words Latex ; steric stabilization ; SAXS ; turbidity
    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  The synthesis and comprehensive characterization of a purely sterically stabilized latex with narrow size distribution is reported. By use of non-ionic initiators no chemically bound surface charges are generated. Stabilization of the particles is achieved through use of a non-ionic surfactant having a double bond in the hydrophobic part which is chemically bound to the surface. Analysis of the latex particles thus generated by transmission electron microscopy, disc centrifugation, and small-angle X-ray scattering (SAXS) reveals that the size distribution is narrow (standard deviation between 6 and 10%). SAXS furthermore demonstrates that the surfactant is located in a thin layer on the surface. The interaction of the particles is purely repulsive as shown by the analysis of the turbidity of the latex. The systems obtained herein may serve as model systems of water-borne purely sterically stabilized colloid particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050312
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