Naslov
Montmorillonite Modified with Liquid Crystalline Diol Hydrochlorides: Preparation and Characterization

Autori
Brnardić, Ivan ; Huskić, Miroslav ; Žigon, Majda ; Ivanković, Marica

Izvornik
Journal of non-crystalline solids (0022-3093) 354 (2008), 18; 19861-1991

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Organics ; Silicates ; X-ray Diffraction ; Thermal Analysis

Sažetak
Intercalation of liquid crystalline species into the interlayer space of montmorillonite was performed by the ion-exchange method. Liquid crystalline diol hydrochlorides that differ in the spacer lengths (6, 8 or 10 methylene units) and the type of end group bound to mesogen (nitro or methoxy) was used. Parent clay, purified clay (montmorillonite) and organically modified montmorillonite were characterized by X-ray diffraction analysis (XRD) and simultaneous differential scanning calorimetry-thermogravimetric analysis. (DSC-TGA). The basal spacing of unmodified montmorillonite, determined by XRD, was 1.25 nm and after modifications with  -[Bis(2-hydroxyethyl)amino]- -(4-nitroazobenzene-4'-oxy)alkane hydrochloride it increased up to 1.96 nm. XRD peak broadening and a loss of peak intensity were very pronounced in the montmorillonite modified with  -[Bis(2-hydroxyethyl)amino]- -(4-methoxyazobenzene-4'-oxy)alkane hydrochloride, with 10 methylene units, indicating a disordered structure. TGA results showed that the modification reduced the adsorption of water from 8% for unmodified montmorillonite to 2-3 % for organically modified montmorillonite and that that the cation exchange between inorganic and organic ions was between 40 and 50%.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Temeljne tehničke znanosti

Napomena
Glavni autori: Marica Ivanković, Ivan Brnardić

POVEZANOST RADA