Microwave versus conventional preparation of organoclays from natural and synthetic clays

Sara Baldassari, Sridhar Komarneni, Emilia Mariani, Carla Villa

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Organoclays are hybrids derived from an ion exchange of hydrophilic clays with quaternary ammonium salts. The exchange makes the clay hydrophobic and enables it to swell in non-aqueous systems; because of this property, organoclays are widely used as rheological additives in paints, inks, cosmetics and as pollutant absorbing agents in soil remediation programs. We studied the manufacturing process of organic-clay hybrids using one natural (Na-montmorillonite) and several synthetic clays (Na-fluorophlogopites) as precursors: organoclays prepared from synthesized clays are characterized by higher purity and reproducibility as well as specifically designed features. We prepared the organoclays using both conventional-hydrothermal and microwave hydrothermal processes, in order to compare the results obtained with two different heating methods under the same reaction conditions. We found that there are no significant differences in terms of kinetics of intercalation with lower-charged clays, while microwaves can lead to better results in the treatment of higher-charged clays.

Original languageEnglish (US)
Pages (from-to)134-141
Number of pages8
JournalApplied Clay Science
Issue number1-2
StatePublished - Jan 2006

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology


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