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  • 1
    Electronic Resource
    Electronic Resource
    Viscoelasticity-concentration relationships for non-aqueous concentrated dispersions (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 553-556 
    Details
    ISSN: 1435-1536
    Keywords: Concentrated dispersions ; viscoelasticity ; PMMA particles
    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 viscoelastic properties of a concentrated 0.6 μm diameter polymethyl methacrylate (pMMA) dispersion, sterically stabilised with a pMMA — polyhydroxystearic acid (pHS) graft copolymer in a hydrocarbon medium, have been measured as a function of concentration at a single fixed frequency (10 Hz) and temperature (23 °C). The measurements were made with a novel viscoelastometer, where the properties of a large (150 g) sample are measured under conditions of minimal disturbance (shear strain and strain rate). The results demonstrate that, in the system measured, small but distinct elastic effects are measurable at concentrations (phase volume fraction) values, where the average particle core separation is considerably in excess of twice the average stabiliser barrier thickness. This finding supports the author's argument that elasticity can arise from forces, such as hydrodynamic, other than those colloid forces produced by the interaction of the stabiliser barriers of neighbouring particles of the dispersion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01412511
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  • 2
    Electronic Resource
    Electronic Resource
    The rheological properties of concentrated cetyltrimethylammonium bromide-salicylic acid solutions in water (1989)
    Springer
    Colloid & polymer science 267 (1989), S. 269-280 
    Details
    ISSN: 1435-1536
    Keywords: Rheology ; aqueoussolution ; cetyltrimethylammonium bromide-salicylic acid
    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 Data on the rheological properties of the hexadecyl-trimethylammonium salicylate system (CTAB-SA) in water are reported. Three concentrations were used (0.1, 0.01, and 0.001 M). For the highest concentration, the effect of temperature on the rheology was studied in detail. The rheology of the 0.1 M CTAB-SA solution indicates a very uniform micellar size. By contrast with concentrated polymethyl methycrylate dispersions studied by the author, there was a strong divergence between the viscosity-shear rate and viscosity-frequency data, although the plateau low shear rate and frequency values agreed over a wide range of temperature. This effect could be explained by a shear rate dependent diffusion constant. The large temperature variation of the plateau viscosity and elasticity modulus values could be explained by a combination of micellar number concentration and flexibility changes as the temperature varies. At lower concentrations, the rheological data shows evidence of polydispersity in micellar size. Strong shear thickening and extensional viscosity effects are also evident, probably due to micellar overlap and cluster formation in strong shear fields and the alignment of the very long micelles in elongational flow. The shear thickening effects take some 200 s to relax (0.01 M solution). Recovery of the elasticity after shearing the 0.1 M solution is rapid (a few hundred milliseconds).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410585
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  • 3
    Electronic Resource
    Electronic Resource
    Der Scherverdickungs effekt in konzentrierten Dispersionssystemen (1979)
    Springer
    Colloid & polymer science 257 (1979), S. 222-222 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01638170
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  • 4
    Electronic Resource
    Electronic Resource
    Polymer modified colloidal dispersions (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 279-287 
    Details
    ISSN: 1435-1536
    Keywords: Colloidal dispersion ; polymer ; particles ; interactions ; phase diagram ; depletion ; phase separation ; rheology ; structure
    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 effect of added polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP) on a dispersion of polystyrene particles stabilised with grafted methoxy PEG chains is discussed. PVA adsorbed more strongly on the particles compared to PVP. Polymer addition led to stable mixtures in the case of PVA compared to depletion phase separation observed in the case of PVP. Rheological measurements showed thickening of the dispersion and absence of any structure in the case of PVA, in contrast to structure formation in the case of PVP due to depletion phase separation. A weak gel state was reached for ca. 7% w/w PVP. The observed behaviour is in accord with the relative propensity of PVA and PVP to interact with the particle surface, the grafted chains and their solubility in water. The solvency of the free polymer chains dominated the overall behaviour while the contribution from the incompatibility between free and grafted chains was conterbalanced by differences in the free polymer adsorption on the particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657835
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  • 5
    Electronic Resource
    Electronic Resource
    On the observation of micellar structures by dielectric spectroscopy (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 938-948 
    Details
    ISSN: 1435-1536
    Keywords: Cationicsurfactants ; micelles ; dielectricdispersion ; micellarnetworks ; barriercapacitance
    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 Many cationic surfactants form, in the presence of certain organic acids, large supramolecular micellar structures in water. The dielectric response of one such system (cetyl trimethyl ammonium bromide-salicylic acid, CTMAS) has been studied as a function of frequency, concentration and temperature. The results are compared with dynamic mechanical data on the same system, which has been published in the literature. The dielectric response shows that the micelles form a rigid, open network structure, which does not impede ionic transport in the bulk liquid. However, the response also shows the presence of a frequency dispersive barrier capacitance. From the variation of the properties of this capacitance with CTMAS concentration and applied voltage over a range of frequencies, it is deduced that the barrier originates in an ordered micelle structure at each electrode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657311
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  • 6
    Electronic Resource
    Electronic Resource
    The viscoelastic properties of concentrated suspensions (1983)
    Springer
    Colloid & polymer science 261 (1983), S. 74-81 
    Details
    ISSN: 1435-1536
    Keywords: Concentrated suspensions ; viscoelasticity steric stabilisation ; non-aqueous dispersions
    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 viscoelastic properties of concentrated, well dispersed, sterically stabilised polymethyl methacrylate particles were studied using a specially developed low frequency, controlled shear stress rheometer. The experimental results show a well defined viscoelastic transition over a narrow frequency range. Evidence is produced to show that the particles act as hard, non-interacting spheres. It is argued that the transition represents a change from a randomly packed assemblage with particle motion dominated by Browniandiffusion processes to a lower packing density shear flow regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411521
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  • 7
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    Viscoelasticity-concentration relationships for non-aqueous concentrated dispersions (1987)
    Springer
    Details
    Publication Date: 1987-06-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 8
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    The viscoelastic properties of concentrated suspensions (1983)
    Springer
    Details
    Publication Date: 1983-01-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 9
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    Polymer modified colloidal dispersions (1995)
    Springer
    Details
    Publication Date: 1995-03-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 10
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    Der Scherverdickungs effekt in konzentrierten Dispersionssystemen (1979)
    Springer
    Details
    Publication Date: 1979-02-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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