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  • 1
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    PROOFS AND REFUTATIONS (I) (1963)
    Oxford : Periodicals Archive Online (PAO)
    The British journal for the philosophy of science. 14 (1963:May-1964:Feb.) 1 
    Details
    ISSN: 0007-0882
    Thema: Allgemeine Naturwissenschaft , Philosophie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4064-1963-014-00-000001
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  • 2
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    PROOFS AND REFUTATIONS (IV) (1963)
    Oxford : Periodicals Archive Online (PAO)
    The British journal for the philosophy of science. 14 (1963:May-1964:Feb.) 296 
    Details
    ISSN: 0007-0882
    Thema: Allgemeine Naturwissenschaft , Philosophie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4064-1963-014-00-000014
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  • 3
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    PROOFS AND REFUTATIONS (II) (1963)
    Oxford : Periodicals Archive Online (PAO)
    The British journal for the philosophy of science. 14 (1963:May-1964:Feb.) 120 
    Details
    ISSN: 0007-0882
    Thema: Allgemeine Naturwissenschaft , Philosophie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4064-1963-014-00-000006
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  • 4
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    PROOFS AND REFUTATIONS (III) (1963)
    Oxford : Periodicals Archive Online (PAO)
    The British journal for the philosophy of science. 14 (1963:May-1964:Feb.) 221 
    Details
    ISSN: 0007-0882
    Thema: Allgemeine Naturwissenschaft , Philosophie
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4064-1963-014-00-000010
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  • 5
    Digitale Medien
    Digitale Medien
    Mass, size and shape of micelles formed in aqueous solutions of ethoxylated nonyl-phenols (1987)
    Springer
    Colloid & polymer science 265 (1987), S. 715-722 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Non-ionicsurfactants ; ethoxylatednonylsphenols ; micellar mass ; hydrodynamicradius ; conformation ofmicelles
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The study was extended to analysis of mass, size and conformation of micelles formed in aqueous solutions of ethoxylated nonyl phenols. The results obtained by ultracentrifugal technique between 293 and 323 K have proved that the slightly ethoxylated nonyl phenols form micelles with high molecular mass and larger size at constant temperature, while the increasing length of the ethylene oxide chain favours formation of micelles of smaller molecular mass and size. The transformation of conformation from oblate to spherical shapes ensues with increasing temperature at constant ethoxy number or with ethoxylation at constant temperature. The second virial coefficient decreases with increasing temperature and decreasing ethoxy number. In accordance with the earlier conclucions, the change of the second virial coefficient relates to enhanced variation of monomer solubility, stabilization of micelle structure and increased deviation from ideal behaviour of a given micellar system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01425034
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  • 6
    Digitale Medien
    Digitale Medien
    Micelle formation of ethoxylated nonyl-phenols in aqueous solutions (1986)
    Springer
    Colloid & polymer science 264 (1986), S. 267-272 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Non-ionic surfactants ; ethoxylated nonyl-phenols ; micellization ; thermodynamics of micelle formation ; critical micelle concentration
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract The micelle formation of nonyl-phenols with various numbers of ethoxy groups (n EO=10–40) was investigated in aqueous solutions and the study was focussed on the effect of temperature (293–323 K), the chain length and the inorganic electrolyte (NaCl) on the critical micelle concentration (c.m.c). The c.m.c. was determined by surface tension and interfacial tension measurements in a water/n-octane system. On the basis of the actual c.m.c. and its temperature dependence the thermodynamic functions of micelle formation (ΔH° m,ΔS°m,ΔG°m) were also calculated. The latter study comprised the determination of the thermodynamic function for unity ethoxy groups (Δ(ΔY° m)) as a function ofn EO. According to the experimental results the micellar solutions are the more stable, the smaller the number of ethoxy groups in the tenside molecule and the higher the temperature as well as the electrolyte content of the system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01414964
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  • 7
    Digitale Medien
    Digitale Medien
    On the preparation of 4-mercapto-azetidinones
    Amsterdam : Elsevier
    Tetrahedron Letters 20 (1979), S. 2929-2932 
    Details
    ISSN: 0040-4039
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(01)86455-8
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  • 8
    Digitale Medien
    Digitale Medien
    Diffusion of Randon in Porous Media Saturated with Gels and Emulsions (1997)
    Springer
    Transport in porous media 27 (1997), S. 171-184 
    Details
    ISSN: 1573-1634
    Schlagwort(e): diffusion ; randon ; gel ; emulsion ; environmental protection.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Technik allgemein
    Notizen: Abstract The effective diffusion coefficient of radon was determined in polymer/silicate gels and clay suspension used as sealing materials in environmental protection. On the basis of the experimental findings, it was concluded that both materials drastically decrease the convective mass transport in porous media. Simultaneously, the effective diffusion coefficient was reduced significantly. Thus, the radon flux might be decreased by 5 to 6 orders of magnitude in porous systems originally having gas or low water saturation by injection of gel-forming materials or placement of clay suspensions. At high water saturation, however, the diffusion transport of radon can be slightly restricted in consolidated and unconsolidated porous media. The laboratory studies may firmly allow us to conclude that hydrogels and clay suspensions are prospective candidates in an integrated environmental technology to be used for restriction of radon migration in subsurface regions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006564200829
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  • 9
    Digitale Medien
    Digitale Medien
    Effect of ethoxylated nonyl-phenols on interfacial rheological properties of oil/water systems (1997)
    Springer
    Colloid & polymer science 275 (1997), S. 493-501 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Key words Surfactants ; non-ionic tensides ; interfacial rheology ; oil ; water interface ; rigid films
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract  Interfacial rheological properties of different Hungarian crude oil/water systems were determined in wide temperature and shear rate range and in presence of ethoxylated nonyl-phenols with ethoxy group number between 10 and 40. The fundamental conclusion of the experimental results is that the interfacial viscosity, the non-Newtonian flow behavior and the activation energy of the viscous flow drastically decrease in presence of non-ionic surfactants. Modification of these interfacial rheological properties increase with decreasing ethoxy group number and increasing tenside concentration and temperature. The most radical change was observed in presence of NPEO10. As a summary it was evidenced that the interfacial rheology is an efficient and powerful detection technique, which may enhance our knowledge on formation, structure, properties and behavior of interfacial layers formed in oil/water systems. Thus, similar studies will probably accelerate the progress significantly not only in oil recovery but also in all areas of colloid science and technology.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003960050109
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  • 10
    Digitale Medien
    Digitale Medien
    Effect of alkaline materials on interfacial rheological properties of oil-water systems (1999)
    Springer
    Colloid & polymer science 277 (1999), S. 41-47 
    Details
    ISSN: 1435-1536
    Schlagwort(e): Key words Alkaline materials ; Interfacial rheology ; Oil-water interface ; Rigid films
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract Interfacial rheological properties of a model crude oil-water system were studied in the presence of sodium hydroxide. The interfacial viscosity, the non-Newtonian flow behavior and the activation energy of viscous flow were determined as a function of shear rate, alkali concentration and aging time. The fundamental conclusion of the experimental results is that the interfacial viscosity drastically decreases in the presence of alkaline materials and the change under favorable conditions may exceed 3 or 4 orders of magnitude. Simultaneously, the sodium hydroxide effectively suppresses the non-Newtonian flow behavior of the interfacial layer. The experimental observations are explained by simultaneous chemical processes taking place in the boundary layer. The present data may help to elucidate the formation, stability and breaking of alkali-containing oil-water emulsions and they provide additional information for better understanding of the displacement mechanism and for the formulation of alkaline flooding as a potential chemically enhanced oil-recovery method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003960050365
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