Neutron-scattering studies of concentrated oxide sols

Prediction and Measurement of the Interparticle Depletion Interaction Next to a Flat Wall

“…Specifically, the size of 12 nm used in the calculations presented above was taken from a data sheet on Ludox colloidal silica obtained from Dupont (the actual manufacturer of the silica particles). However, published measurements of the dry diameter of Ludox HS particles, also listed as 12 nm in diameter on the Dupont data sheet, range from 13.5 to over 19 nm (36)(37)(38)(39). Another possible factor is the presence of particle aggregates, which were observed using similar Ludox AM particles by Matijevič et al (40).…”

Flocculation of Colloidal Silica with Hydrolyzed Aluminum: An 27Al Solid State NMR Investigation

“…Silica suspensions were prepared from a concentrated silica sol, Ludox HS 40, which was kindly supplied by SPCI (France). Ludox HS has already been extensively studied − and consists of discrete, nonporous, almost spherical particles whose mean diameter is about 14 nm in size. Ludox HS was used as received; the stock silica suspension was diluted to 500 ppm with deionized water (MilliQ) and concentrations of 70 ppm NaCl and 336 ppm NaHCO 3 were included to provide pH and ionic strength buffers similar to that of typical river water.…”

Colloidal zeolites and zeolite membranes

“…Such contrast variation measurements were made with a dilute particle dispersion of the same concentration in a series of different H 2 O/D 2 O mixtures, as previously described. 12,18 The samples were prepared from a colloidal dispersion in pure D 2 O which had formed after approximately 20 hours under the same synthesis conditions as above. This reference dispersion in D 2 O was concentrated by ultracentrifugation.…”