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Browsing by Subject "delamination"

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  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Delaminacja hydrotalkitów
    (Data obrony: 2013-07-11) Dziadkowiec, Joanna
    Wydział Geologii, Geofizyki i Ochrony Środowiska
    In recent years, the advanced nanomaterials based on single, delaminated mineral layers are of a great interest. The aim of this study was to investigate the delamination of hydrotalcites - synthetic, anionic clays. The process was carried out, using the samples modified organically with anionic surfactants and then dispersed in solutions of long-chained alcohols. As a result, stable colloidal solutions were obtained. The number of analyses (XRD, XRD in a suspension, FTIR) were employed to investigate the effect of delamination. However, the interpretation of them appears to be doubtful. Additionaly, the delaminated monolayers of hydrotalcite and smectite were further used in an attempt to synthesize a layer-by-layer, mineral nancomposite.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Delaminacja smektytów
    (Data obrony: 2013-07-11) Rogowska, Melania
    Wydział Geologii, Geofizyki i Ochrony Środowiska
    The detailed understanding of the delamination of layered minerals is of a great importance in a design of new advanced nanomaterials. In this study, the attempt of delamination of various smectites was undertaken. Three natural dioctahedral smectites and one synthetic trioctahedral smectite were modified by ion exchange with two organic cations with different chain length: cetyltrimethylammonium (CTMA) and decyltrimethylammonium (DTMA) cations. Organo-minerals were dispersed in an organic solvent like 1-octanol. The systems obtained were colloidal but unstable. The XRD and FTIR techniques does not allow to conclude that delamination process took place. For the further investigation of the delamination process, a layer-by-layer composite was prepared, which consisted of hydrotalcite and montmorillonite. The obtained material, prepared by solvothermal treatment, suggests the delamination of both hydrotalcite and montmorillonite.