caa a22 4500 388021268 CHVBK 20180307124925.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1557/JMR.1998.0031 doi S0884291400042680 pii (NATIONALLICENCE)cambridge-10.1557/JMR.1998.0031 Preparation and properties of potassium-vermiculite films [Elektronische Daten] Flexible films of vermiculite have been prepared from aqueous suspensions after swelling by cation exchange and mechanical delamination. Two different swelling cations, lithium and butylammonium, have been investigated. The degree of swelling and delamination during the suspension preparation was characterized by the percentage of water reabsorbed by dried clays and the adsorption of methylene blue. The vermiculite saturated with lithium ions is more easily delaminated but contains more water than those saturated with butylammonium. Good quality coherent flexible films could be prepared from both the lithium and butylammonium exchanged vermiculites but the high percentage of water found in the films has a detrimental effect on their dielectric properties. To reduce the amount of water in the exchanged vermiculites a second ion exchange with potassium, a less hydratable cation, was investigated. Films prepared after exchange with potassium showed significant improvements in their dielectric properties, with a dielectric constant ∈ around 10 and a dissipation factor tan δ around 0.06 at 25 °C and a frequency of 1 kHz. Copyright © Materials Research Society 1998 Minker-Villemin Caroline Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland Bowen Paul Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland Lemaître Jacques Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland Ring Terry A. Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland Journal of Materials Research Cambridge University Press 13/1(1998-01), 228-236 0884-2914 13:1<228 1998 13 JMR https://doi.org/10.1557/JMR.1998.0031 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1557/JMR.1998.0031 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Minker-Villemin Caroline Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland NATIONALLICENCE 700 1- Bowen Paul Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland NATIONALLICENCE 700 1- Lemaître Jacques Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland NATIONALLICENCE 700 1- Ring Terry A. Powder Technology Laboratory (LTP), Materials Department, Swiss Federal Institute of Technology (EPFL), 1015 Lausanne, Switzerland NATIONALLICENCE 773 0- Journal of Materials Research Cambridge University Press 13/1(1998-01), 228-236 0884-2914 13:1<228 1998 13 JMR CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge