Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • homogeneity effect  (1)
  • photochemical hole burning  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Preparation of high homogeneity BaO-TiO2-SiO2 gel (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 387-391 
    Details
    ISSN: 1573-4846
    Schlagwort(e): BaO-TiO2-SiO2 gel ; homogeneity effect ; crystallization
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract In BaO-TiO2-SiO2 system, crystallization from various gel by heating depended on the sol-gel processes and gel homogeneity. Through the condensation reaction of Si(OAc)4 and TiAcAc(O i Pr)3 in tetrahydrofuran solvent, homogeneous TiO2-SiO2 sol with oligomers of relatively large molecular weight was obtained. The gel prepared by mixing the binary sol, Ba(OAc)2, and Si(OMe)4 was the most homogeneous in term of suppression of crystallization. By heating the above gel, only Ba2TiSi2O8 crystal appeared, which was observed in a melt quenched glass. In the case of the gels made by other sol-gel processes, TiO2 or BaTiO3 crystal was first observed from the heated gels prior to the precipitation of Ba2TiSi2O8.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486276
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Spherical dye-doped silica particles (1994)
    Springer
    Journal of sol gel science and technology 2 (1994), S. 755-759 
    Details
    ISSN: 1573-4846
    Schlagwort(e): monomer dispersion in spheres ; photochemical hole burning ; microcavity effect
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Organic dyes such as water soluble porphyrins were incorporated into monodispersed SiO2 particles using the sol-gel technique (the Stober synthesis) and their monomeric and dimeric properties were investigated by aiming at the microcavity effect. Doping efficiencies of dyes into SiO2 particles depended on dye's hydrophilic properties. The doping efficiency of a porphyrin, TTMAPP, decreased with increasing the nominal content in the starting solution and the doping content showed the maximum value of 1.6×10−5 mol/g SiO2. With increasing the TTMAPP content, spectra of doped particles were changed from dimeric to monomeric nature; the absorption peak due to dimers disappeared and halfwidth of absorption at Soret band decreased. This unusual change was caused by the decrease of particle sizes by dye doping. The TTMAPP-doped sample having monomeric spectrum showed the fluorescence life time of 8.5 nsec and photochemical hole burning at about 5 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00486344
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...