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Preparation of Mg-Vermiculite Nanoparticles Using Potassium Persulfate Treatment

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Delamination/exfoliation process of the Mg-vermiculite (Letovice, Czech Republic), particles with size less than 5 m, was studied after potassium persulfate treatment and compared with known method utilized hydrogen peroxide treatment. X-ray powder diffraction (XRPD) patterns showed that treatment of Mg-vermiculite with different molar concentration of potassium persulfate: c = 0 02, 0.04, and 0.08 mol · dm−3 at the temperature 60 °C for 2 hr caused reduction of relative intensity (Irel.) of the basal 001 diffraction to the 15%, 9%, and 4%, respectively, compared to intensity of 001 diffraction of untreated Mg-vermiculite (Irel. = 100%). On the other hand Irel. of the 001 diffraction of Mg-vermiculite after treatment with 30% and 50% (c = 9.8 and 17.4 mol · dm−3) hydrogen peroxide at the 60 °C for 2 hr decreased only to Irel. = 36% and 32%, respectively. Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM) verified effect of potassium persulfate treatment on structure degradation which is connected with higher degree of delamination/exfoliation of the particles and their cracking into nano-sized particles.
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Keywords: AFM; EXFOLIATION; HYDROGEN PEROXIDE; MG-VERMICULITE; POTASSIUM PERSULFATE; SEM; XRPD

Document Type: Research Article

Publication date: 2006-08-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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