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pro vyhledávání: '"Johan Sjo¨blom"'
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :225-232
Interfacially active components (asphaltenes and resins) have been extracted from North Sea crude oils and aged at 50°C. Model water-in-oil emulsions have been stabilized by these compounds in different amounts and ratios. The stability of these emu
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :593-607
A summary of the central problems of a colloidal chemical nature in offshore crude oil production and transport is presented. It is concluded that emulsified systems, mainly water/oil, are of high importance. Under North Sea conditions these emulsion
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :549-560
The dependence of the size of the silica particles produced by a sol-gel process on constituent concentrations, reaction temperature and time was studied using reduced factorial design 2 6-2 . Much information is obtained with a few experiments. The
Autor:
Marit-Helen Ese, Johan Sjo¨blom
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :479-489
Acid-base interactions and the influence of multivalent cations on the stability of stearic acid monolayers were studied by means of the Langmuir technique. The surface activity of secondary and tertiary amines increases with increasing size of the h
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :135-144
Interactions between benzoic acid and octyl amine have been studied by means of chemometric methods, i.e. PCA score plot and rank analysis and by adsorption onto solid α-alumina without and with 0.1 M NaCl and with pH adjusted to 4.2 or 3.95. The ch
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :329-337
Hydrolysis and condensation of tetramethyl orthosilicate (TMOS) in alcohol solutions of hydrated metal salts have been studied. The alcohols were methanol and ethanol, and the metal salts were nickel nitrate hexahydrate (Ni(NO 3 ) 2 .6H 2 O) and calc
Autor:
Johan Sjo¨blom, Stanislav S. Dukhin, Svetlana V. Verbich, Øystein Holt, Øystein Sæther, Andrej Tarovski
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :209-223
The kinetics for emulsion coagulation retarded by the electrostatic repulsion between droplets in the micron size range was studied. The rather high electrokinetic potential is provided by the presence of 10−3 M NaOH. The enormous discrepancy betwe
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :195-207
The rapid and reversible coagulation of oil (toluene) droplets during their lateral diffusion inside glass microcapillaries was studied by means of video enhanced microscopy (VEM). The methodological problems arising in the application of VEM to the
Autor:
Johan Sjo¨blom
Publikováno v:
Colloids and Surfaces A: Physicochemical and Engineering Aspects. :1-2
Publikováno v:
Journal of Colloid and Interface Science. 100:27-32
A model predicting the behavior of the dielectric constant for a system consisting of prolate reversed micelles with an ionic, aqueous core dispersed in a decanol-water medium, is presented. Theoretical values are compared with experimentally evaluat