The rhodamine B intercalation of montmorillonite

RETRACTED ARTICLE: Synthesis, characterization and assessment thermal properties of clay based nanopigments

“…This phenomenon occurs in different processing steps and leads to a serious contamination of processing tools. Additionally, dyes exhibit bad properties [7] such as low stability to UV radiation, oxygen and temperature. Pigments are inorganic substances and in general their properties are better than dyes.…”

Composition, structure, and luminescence of montmorillonites saturated with different aggregates of methylene blue

“…In contrast with, e.g., rhodamine B, which aggregates in water solutions, forming dimers, and whose isosbestic point is characteristic for this aggregation [16,24], methylene blue cations also form trimers, tetramers, and probably even higher aggregates. For higher dye aggregation, absence of an isosbestic point is typical in the visible part of the spectrum, and moreover, for increasing concentration of MB in aqueous solution, the wavelength of the absorption maximum of higher aggregates (about 600 nm) is continuously moving.…”

“…The percentages of dye polymers presented in Table 1 were calculated as arithmetic means from both calculated data [25,26]. Because every montmorillonite sample was repeatedly saturated with the dye solution at the same concentration, we can assume equilibrium between the analytical concentration of methylene blue (and its calculated agglomerates) and prepared fully saturated montmorillonites [16]. In the same Table 1 Table 1).…”

“…For the acquisition of a perspective on the ordering of molecules in interlayers, the method of molecular modeling is an invaluable tool [14][15][16]. The results obtained by this method show that intercalated molecules (guests) deposited in the interlayers of, e.g., smectites (host) are bonded to basal tetrahedral nets of clay minerals by weak interactions (van der Waals, Coulomb, and H-bonds).…”

Study of cetyltrimethylammonium and cetylpyridinium adsorption on montmorillonite

“…Twice-distilled water deionized by a mixed-bed ion exchanger (Watek, Czech Republic) was used for the preparation of all solutions. 4 with a cation-exchange capacity (CEC) of 0.9 meq/g [12] was used as the host structure for the absorption of CTA and CP. The cationic surfactants were dissolved in a mixture of water and ethanol (50:50, v/v), a portion of MMT was added, and this suspension was shaken vigorously for 2 h. The suspension was centrifuged for 20 min and a supernatant was analyzed by capillary isotachophoresis (ITP) and atomic absorption spectrometry (AAS).…”