Surface modifications of talcs. Effects of inorganic and organic acid treatments

Thermoplastic starch/talc bionanocomposites. Influence of particle morphology on final properties

“…FTIR spectrum corresponding to A10 and SJ10 talc samples shared the same characteristics bands located at 3676 cm À1 (Mg 3 eOH), 1018 cm À1 (SieOeSi stretching), 671 cm À1 (eOH deformation), 536 and 452 cm À1 (SieOeMg), 466 cm À1 (MgeO) and 426 cm À1 (SieO). Similar results were reported by Castillo et al (2011). Talc genesis is also revealed by the presence of some impurities such as chlorite (Ch), calcite (C), dolomite (D), and magnesite (Mg) in SJ10 sample (Fig.…”

“…Besides, this talc has a microcrystalline morphology, where small platelets are stacked up heterogeneously. On the other hand, SJ10 is a blockytype talc sample with long and well stacked up platelets which corresponds to a macrocrystalline structure (Castillo, Barbosa, Maiza, & Capiati, 2011). Moreover, these talc particles appear as blocks, with abrupt and well defined borders.…”

Microwave and acid modified talc as adsorbents of methylene blue in aqueous solution

“…Research showed that associated minerals in talc were dissolved away by monocarboxylic organic acids, with the result that the talc as more pure and particle size of the talc was smaller. 13 Simultaneously, it was found that the adsorptive ability of talcum powder modified by nitric acid was increased compared to that of unmodified talcum powder, and that the acid could dissolve inorganic salts, which open the internal pores of the talcum powder. 10 Taken together, acid treatments could improve the adsorptive ability of minerals.…”

Effect of operational parameters and stress energies on stirred media milling of talc

“…A special feature of talc is its exceptional particle shape: platy with a three-layer structure in which octahedral magnesium oxide is layered between hydrophobic tetrahedral silica layers [1,6]. Talc particles have a high aspect ratio (particle diameter/thickness ≈ 20:1), referring to micron-sized dimensions of length and width and to the nano-sized dimension of thickness [7,8]. Due to this special property, talc qualifies as a good reinforcement and coverage filler of applications, compared to other industrial minerals such as calcium carbonate (CaCO 3 ).…”