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  • polymer colloids  (2)
  • protein adsorption  (2)
  • Anionicsurfactants  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effective interaction potential obtained from experimental structure factors: The inverse problem (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 104-106 
    Details
    ISSN: 1435-1536
    Keywords: Structure factors ; colloidal stability ; polymer colloids
    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 structure factorS(q) was measured for a colloidal dispersion of latex microspheres (40 nm of diameter) by both static and dynamic light scattering (using a Malvern Instruments spectrometer, λ=488 nm). The structure was formed for a sample of particle number density 2×1013 ml−1. The interaction potential was determined from the experimentalS(q) by means of the straightforward use of three different closures (Percus-Yevick, hipernetted chain, mean spherical approximation). Some difficulties found with this procedure (such as the cut-off effect) are discussed. However, these closures lead to very similar results. Furthermore, the results are tested and compared with the simulations based on a Yukawa potential.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182421
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of anionic surfactants on positively charged polystyrene particles II (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 406-411 
    Details
    ISSN: 1435-1536
    Keywords: Anionicsurfactants ; cationiclatex
    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 In the case of cationic polystyrene latex, the adsorption of anionic surfactants involves a strong electrostatic interaction between both the particle and the surfactant, which may affect the conformation of the surfactant molecules adsorbed onto the latex-particle surface. The adsorption isotherms showed that adsorption takes place according to two different mechanisms. First, the initial adsorption of the anionic surfactant molecules on cationic polystyrene surface would be due to the attractive electrostatic interaction between both ionic groups, laying the alkyl-chains of surfactant molecules flat on the surface as a consequence of the hydrophobic interaction between these chains and the polystyrene particle surface, which is predominantly hydrophobic. Second, at higher surface coverage the adsorbed surfactant molecules may move into a partly vertical orientation with some head groups facing the solution. According to this second mechanism the hydrophobic interactions of hydrocarbon chains play an important role in the adsorption of surfactant molecules at high surface coverage. This would account for the very high negative mobilities obtained at surfactant concentration higher than 5×10−7 M. Under high surface-coverage conditions, some electrophoretic mobility measurements were performed at different ionic strength. The appearance of a maximum in the mobility-ionic strength curves seems to depend upon alkyl-chain length. Also the effects of temperature and pH on mobilities of anionic surfactant-cationic latex particles have been studied. The mobility of the particles covered by alkyl-sulphonate surfactants varied with the pH in a similar manner as it does with negatively charged sulphated latex particles, which indicates that the surfactant now controls the surface charge and the hydrophobic-hydrophilic character of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654587
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental evidence regarding the influence of surface charge on the bridging flocculation mechanism (1997)
    Springer
    Colloid & polymer science 104 (1997), S. 144-147 
    Details
    ISSN: 1435-1536
    Keywords: Colloidal aggregation ; bridging flocculation ; single particle detection ; surface charge ; protein adsorption
    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 In this work, the influence of particle surface charge density on the mechanism of bridging flocculation is studied. Different amount of bovine serum albumin (BSA) molecules were adsorbed onto the surface of two almost identical systems of polystyrene particles which differ only in their surface charge density. Flocculation was induced by adding a small amount of electrolyte to a dilute suspension. Single particle light scattering was used to monitor the flocculation processes. It was found that steric stabilisation does not prevent aggregation in all cases and at least some weak flocculation occurs. Nevertheless, it inhibits complete flocculation of the sample. The initial rate constants are obtained and it is shown that the constant kernel solution for Smoluchowski's system of rate equations cannot describe the flocculation processes. No clear evidence for bridging flocculation was found for the particles with low surface charge. For the higher charged particles, however, a pronounced maximum for the initial flocculation rate was measured at intermediate surface coverage. This finding gives clear evidence for bridging flocculation and that the particle surface charge indicater is a very important parameter for the formation of protein bridges between the particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01182433
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  • 4
    Electronic Resource
    Electronic Resource
    Sequential adsorption of F(ab′)2 and BSA on negatively and positively charged polystyrene latexes (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 47 (1995), S. 633-639 
    Details
    ISSN: 0006-3592
    Keywords: protein adsorption ; sequential ; polymer colloids ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The aim of the present work is to study the sequential adsorption of F(ab′)2 and bovine serum albumin (BSA) molecules adsorbed onto positively and negatively charged polystyrene latexes. Cationic and anionic latexes were prepared by emulsifier-free emulsion polymerization. Adsorptions of F(ab′)2 on both latexes at a low ionic strength and different pHs were performed. The cationic latex showed a higher adsorption of F (ab′)2 molecules over a range of pH, which could be due to the formation of multilayers. Sequential adsorption of anti-CRP F(ab′)2 and monomeric BSA were performed at two different pre-adsorbed F(ab′)2 amounts on both types of latex. Displacement of F(ab′)2 occurred only when the preadsorbed amounts were larger than a certain critical value, which depends on the adsorption pH. A greater displacement of larger preadsorbed amounts might be the result of a weaker contact between the protein molecules and the polystyrene surface. The displacement of F(ab′)2 previously adsorbed onto both latexes occurred due to pH changes, an increase of ionic strength and the presence of BSA molecules. The effect caused by these three factors was studied independently. The main factors in the desorption of F(ab′)2 on the anionic latex are the changes in pH and ionic strength, whereas on the cationic latex the desorption is mainly caused by the increase of the ionic strength and the presence of BSA. The colloidal stability of the immunotatex was improved by BSA adsorption, especially on cationic latex. © 1995 John Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260470604
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