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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 275 (1997), S. 440-448 
    ISSN: 1435-1536
    Keywords: Key words Optical video microscopy ; polystyrene latex particles ; hexa-decane oil drops ; aggregation ; flocculation ; coagulation ; hetero ; homo ; selective ; partial wetting ; zeta potential ; Debye length ; total interaction free energy ; DLVO theory ; London ; van der Waals ; electrical double layer ; secondary minimum
    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  An optical video microscopic technique was used to study hetero-aggregation and selective aggregation phenomena among n-hexadecane oil drops (40–110 μm in diameter) and two types of polystyrene latex particles (6.76 and 30.2 μm, in diameter), suspended inside an aqueous medium with pH varying between 1.1 and 12.9. A single drop was produced in situ using a micropipette inside the aqueous phase-filled glass microcapillary (100–160 μm i.d.) containing the particles. Interactions between the drop and the solid particles and among the solid particles was achieved by movement of the aqueous medium in and out of a second micropipette. Drop–particle interactions were distinctly different from particle–particle interactions. It was observed that the latex particles aggregated irreversibly with the oil drop in all cases except two, viz. for 6.76 μm particles at around neutral pH whereas the irreversibility of aggregation in particle–particle interactions was only seen at the ends of the pH spectrum. At around neutral pH, the flocs or clusters of small particles were very weak. Visual observations at each pH are explained on the basis of the classical DLVO (Derjaguin–Landau–Verwey–Overbeek) theory. Partial wetting of particles surfaces by oil appears to be a key factor in the irreversibility of drop– particle hetero-aggregation. Results indicate that the display of reversible, irreversible or weak aggregation depends on the location and depth of the secondary minimum and that the long-range, attractive, London–van der Waals force is responsible for the initial formation of an aggregate.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 276 (1998), S. 117-124 
    ISSN: 1435-1536
    Keywords: Key words: Modified Booth equation ; zeta potential ; electrophoretic mobility ; relaxation effect ; computer program ; Henry equation ; polystyrene latex particles ; bitumen-in-water emulsions ; ionic strength ; Debye length ; electrical double layer
    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  An easy-to-use computer program based on the modified Booth equation (MBE) is developed to calculate the zeta potential of a spherical nonconducting particle from knowledge of the electrophoretic mobility, particle size, and the type and concentration of ions present in the solution. The program is applied to five sets of previously published literature data and the resulting zeta potentials are compared with the values given by the Henry equation to illustrate the extent of the relaxation effect in each case. In four cases, the output zeta potential data are compared with the corresponding values obtained from the rigorous numerical solution of O’Brien and White. Results indicate that the computer program developed here gives a reliable estimate of the zeta potential. The main advantage in using the MBE lies in its capability of calculating the zeta potential even for cases where the experimentally measured mobility exceeds the maximum theoretical mobility predicted by the O’Brien and White solution.
    Type of Medium: Electronic Resource
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  • 3
    facet.materialart.
    Unknown
    In:  Other Sources
    Publication Date: 2019-06-28
    Description: It is shown that the low frequency turbulence driven by ions reflected in the foot of magnetosonic shocks can accelerate electrons to large energies. The mechanism seems to account for the energetic electron fluxes and the associated wave activity observed in the Earth bow shock.
    Keywords: SPACE RADIATION
    Type: ESA Plasma Astrophys.; p 313-315
    Format: text
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  • 4
    Publication Date: 2019-06-27
    Description: Astrophysical plasmas radio emission interpreted as collective bremsstrahlung due to ultrarelativistic electron tails, discussing Crab Nebula, quasars and Jupiter
    Keywords: SPACE RADIATION
    Type: ; ADEMIE DES SCIENCES
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  • 5
    Publication Date: 2019-06-27
    Description: We show that the electron streams that give rise to type III solar radio bursts are stable and will not be decelerated while propagating out of the solar corona. The stabilization mechanism depends on the parametric oscillating two-stream instability. Radiation is produced near the fundamental and second harmonic of the local electron plasma frequency. Estimates of the emission at the second harmonic indicate that the wave spectra created by the oscillating two-stream instability can account for the observed intensities of type III bursts.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 190; May 15
    Format: text
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  • 6
    Publication Date: 2019-06-27
    Description: The description of a multifluid code with anomalous transport coefficients due to plasma instabilities self consistently followed in space and time is given. As an example, simulations of colliding solar wind streamers are presented. The results compare favorably with the observations.
    Keywords: SPACE RADIATION
    Type: NASA-CR-138174
    Format: application/pdf
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  • 7
    Publication Date: 2019-06-27
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal; 179; Feb. 1
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  • 8
    Publication Date: 2019-06-27
    Description: It is shown that the electron streams that give rise to Type 3 solar radio bursts are stable and will not be decelerated while propagating out of the solar corona. The stabilization mechanism depends on the parametric oscillating two stream instability. Radiation is produced near the fundamental and second harmonic of the local electron plasma frequency. Estimates of the emission at the second harmonic indicate that the wave spectra created by the oscillating two stream instability can account for the observed intensities of Type 3 bursts.
    Keywords: SPACE RADIATION
    Type: NASA-CR-133844 , BN-770
    Format: application/pdf
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  • 9
    Publication Date: 2019-06-27
    Description: A common feature of all rocket measurements of the differential flux of primary and secondary electrons under auroral activity is that between 30 and 85 eV, where the measurements overlap in energy, the electron flux data can be fitted by a certain power law. In the present paper, it is shown that the existence of plasma waves even in a region where they are nonresonant with the ambient particles can significantly modify the observed flux power law.
    Keywords: SPACE RADIATION
    Type: Journal of Geophysical Research; 83; Dec. 1
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