Aggregation of air-dry alumina powder nanoparticles redispersed in an aqueous medium

Preparation of alumina nanoparticle suspensions with narrow particle size distribution

“…According to the DLS weight, the proportion of individual particles of Al 2 O 3 in the suspensions is 40- 80% depending on the degree of dispersion of the source nanopowder; the remainder are aggregates, the size of which is approximately three times higher than the size of individual particles [1]. At the same time, the results show that additional disaggregation is needed for suspensions containing only individual particles.…”

“…It is shown [1] that the primary aggregates in an amount of 35-50% (wt.) are stable; i.e., their further consolidation is not observed for quite a long time.…”

“…The processes of aggregation in aqueous suspen sions by dispersing air dry Al 2 O 3 nanopowders pro duced by plasmochemical and electroexplosive meth ods have been studied in earlier work [1]. It is shown [1] that the primary aggregates in an amount of 35-50% (wt.)…”

Influence of interfacial adhesion and the nonequilibrium glassy structure of a polymer on the enthalpy of mixing of polystyrene-based filled composites

“…The uniformity of dispersion and the degree of particle aggregation in suspensions were estimated via dynamic light scattering on a Brookhaven Zeta Plus analyzer. As was shown in [16], a certain degree of aggregation of nanoparticles in suspensions obtained via dispersion of dry powders in a liquid medium is unavoidable. The average sizes of aggregates that are present in ZnO suspensions are given in Table 1.…”

Aggregation stability of a positively charged γ-Al2O3 sol prepared from an air-dry nanopowder

“…The average particle size of the γ Al 2 O 3 hydrosol, as deter mined by measuring the scattered light intensity, was d agg = 196 nm. This size obviously corresponds to nanoparticle aggregates formed during powder storage [1][2][3][4][5].…”