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This work discusses the sedimentation stability and aging of aqueoussuspension of Laponite in the presence of cetyltrimethylammonium bromide(CTAB). The concentration of Laponite was fixed at the constant level $C_l=2$%wt, which corresponds to the threshold between equilibrium gel IG$_1$ andrepulsive gel IG$_2$ phases. The concentration of CTAB $C_s$ was within 0-0.3%wt. In the presence of CTAB the Laponite aqueous suspensions were unstableagainst sedimentation and they separated out into upper and bottom layers (U-and B-layers, respectively). The dynamic light scattering technique revealedthat the addition of CTAB even at rather small concentration, $C_s=0.0164$ %wt($0.03 CEC$), induced noticeable changes in the aging dynamics of U-layer, andit was explained by equilibration of CTAB molecules that were initiallynon-uniformly distributed between different Laponite particles. Acceleratedstability analysis by means of analytical centrifugation with rotor speed${\omega}=500-4000$ rpm revealed three sedimentation regimes: continuous (I,$C_s<0.14$ %wt), zone-like (II, $0.14<C_s<0.2$ %wt) and gel-like (III, $C_s>0.2$ %wt). It was demonstrated that B-layer was "soft" in the zone-likeregime. The increase of ${\omega}$ resulted in its supplementary compressingand the collapse of "soft" sediment above certain critical centrifugalacceleration.

Sedimentation stability and aging of aqueous dispersions of Laponite in the presence of cetyltrimethylammonium bromide