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  • 1
    Electronic Resource
    Electronic Resource
    Formation and gelation of titania nanoparticles from AOT reverse micelles (1997)
    Springer
    Journal of sol gel science and technology 8 (1997), S. 65-69 
    Details
    ISSN: 1573-4846
    Keywords: nanocrystalline titania powder ; microemulsions ; reverse micelles ; AOT
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Titania nanoparticles have been produced by the controlled hydrolysis of tetraisopropyltitanate (TPT) in sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles. Particle formation and aggregation were investigated by static and dynamic light scattering and the chemical species by vibrational spectroscopy. The kinetics of particle formation and aggregation were controlled by varying [H2O]/[AOT] (w 0), [H2O]/[Ti(IV)] and [AOT]/[Ti(IV)]. Nanoparticles, with diameters〈10 nm, could be produced at relatively high Ti(IV) concentrations (up to 0.05 M). These nanoparticles aggregated into sols, with colloid sizes of 20 to 200 nm, eventually forming gelatinous precipitates. Different titania phases were produced, depending on the size of the micellar water pool; small pools (w 0〈6) yielded amorphous particles, while larger pools (w 0〉10) produced anatase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436819
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Lichenothrix riddlei is an ascolichen and also occurs in New Zealand—light and electron microscopical investigation (1983)
    Springer
    Plant systematics and evolution 143 (1983), S. 293-309 
    Details
    ISSN: 1615-6110
    Keywords: Ascolichens ; Ascomycetes ; Lichenothrix riddlei ; Cyanophyceae ; Scytonema ; Distribution ; anatomy ; fine structure ; Flora of New Zealand
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lichenothrix riddlei is reported from two widely separate localities in New Zealand. It was previously known only from the South Eastern states of U.S.A. Light and electron microscopy show its sterile fungal partner to belong to the ascomycetes. Apparently as a consequence of lichenization, the variation in breadth of the trichomes of theScytonema phycobiont is greater than normal. A thin, probably gelatinous layer, covering the fungal cells and the algal sheath in the interstices between them, can be demonstrated by electron microscopy. In the contact region with the algal cells, the otherwise two layered wall of the haustoria is reduced to one layer only. In the fungal protoplast conspicuous stacks of ER-like membranes can be found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00986611
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    Paper (German National Licenses)
    Fulltext
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