Gelation of gellan induced by trivalent cations and coexisting trivalent with monovalent cations studied by rheological and DSC measurements.

The effect of trivalent cation Fe on the gelation process of a sodium salt form of gellan (DG, deacylated gellan gum) was investigated by rheology and DSC studies. On addition of a fairly low concentration of Fe (1 mM), both the complex modulus (G*) of a 1.0 % DG solution in gel state and the sol-gel transition temperature (T) slightly decreased.

Synthesis of Fluoride-Containing High Dimensionally Structured Nb Oxide and Its Catalytic Performance for Acid Reactions.

High dimensionally structured niobium oxide (HDS-NbO) containing fluoride (F) was prepared by a hydrothermal synthesis. F could be introduced into HDS-NbO by replacing lattice oxygen up to a solid F/Nb ratio of 0.55.