| abstract |
An electrorheological fluid composition comprising a dispersion of an aluminosilicate in an electrically highly resistive fluid vehicle, characterised in that the aluminosilicate comprisesn a) a moiety of empirical formula n(Al₂O₃) b (SiO₂) c nwhere b and c are any numerical values provided that the ratio of b/c lies in the range of 1:1 to 1:9, b) mono- or divalent main group metal cations, hydrogen ions or optionally substituted ammonium ions, and c) a non-aqueous polar adsorbate. eg a crystalline zeolite comprising a non-aqueous polar adsorbate, a particulate material for use as the disperse phase of an electrorheological fluid, which comprises such an aluminosilicate, and a process for the preparation of such a material. |