01830nas a2200181   4500008004100000022001400041245010700055210006900162260007100231300001600302490000800318520110300326100002701429700002501456700002501481700001901506856012301525       2005                        eng d  a1520-610600aLayered inorganic-organic clay-like nanocomposites rearrange to form silsesquioxanes on acid treatment0 aLayered inorganicorganic claylike nanocomposites rearrange to fo  a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcAUG  a16034-160390 v1093 a<p>The formation of talc-like compounds by the condensation of organotrialkoxy silanes with magnesium hydroxide has been recently reported. These represent layered hybrid nanomaterials that have a layer thickness of around 1 nm, have organic moieties covalently linked to the layer surfaces, and are called ``organoclays.'' We show that such compounds are sensitive to acid treatment. When a phenylclay is treated with hydrochloric acid, magnesium leaches out, destroying the layered structure. The extent to which magnesium is leached out is a function of the time of the acid treatment and the concentration of the acid used. Magnesium leaches out rapidly when the concentration of acid used to treat the phenyl-clay is higher, and the extent of structural magnesium that is leached out is also higher for higher acid concentrations. Removal of the magnesium rearranges the structure of the phenyl-clay to form oligomeric phenylsilsesquioxanes. FTIR and NMR suggest that the silsesquioxanes formed by acid treatment of the phenyl-clay comprise a mixture of ladderlike and cagelike structures.</p>1 aKumaraswamy, Guruswamy1 aDeshmukh, Yogesh, S.1 aAgrawal, Vikrant, V.1 aRajmohanan, P.  uhttps://library.ncl.res.in/content/layered-inorganic-organic-clay-nanocomposites-rearrange-form-silsesquioxanes-acid-1