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  • 1
    Electronic Resource
    Electronic Resource
    The size of sodium dodecyl sulfate micelles in the presence ofn-alcohols as determined by fluorescence quenching measurements (1995)
    Springer
    Colloid & polymer science 273 (1995), S. 876-880 
    Details
    ISSN: 1435-1536
    Keywords: Micelles ; micelle size ; fluorescence ; polar additives
    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 steady-state fluorescence quenching technique was used to investigate the effect of the presence of a series of alcohol homologues of mid-sized straight chain on the size of mixed micelles of sodium dodecyl sulfate (SDS). We used pyrene at concentration of ca. 10−6M, where only its monomer exhibits any fluorescence, as fluorescent probe, and cetylpiridinium chloride at concentrations in the range (1–9)×10−5 M as quencher. This technique allows one to determine the micellar aggregation number. The number of alcohol molecules per micelle was calculated from reported values for the micelle-water partition coefficient. On the assumption of spherical micelles, their hydrophobic radii was then calculated. The hypothesis that micelle size is determined by the available surface area per charged headgroup is discussed in the light of the results obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00657637
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  • 2
    Electronic Resource
    Electronic Resource
    Order-disorder in T, T′, and T* phase: Superconductors and related materials (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 30 (1995), S. 193-207 
    Details
    ISSN: 1059-910X
    Keywords: Superconductivity ; n-type superconductors ; Nonstoichiometry ; Superconducting oxides ; T, T′ ; T* structures ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: After reviewing microstructural studies on superconducting materials showing T, T′, and T* structural types, results are presented on the microstructure of some n-type superconductors and related materials prepared with accurate control of the oxygen stoichiometry. Electron microscopy is used to describe the ordering of interstitial oxygen defects in T-type La2NiO4+δ leading to the formation of the n = 2 term of a homologous series with the general formula La8nNi4nO16n+1. Structural transitions and superstructure formation in the Pr2-x-yCexSryCuO4-δ system are reported, where T, T′:;, and T* phases are isolated as a function of both Ce and Sr content. © 1995 Wiley-Liss, Inc.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1070300302
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    Paper (German National Licenses)
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