title: Successive interaction of pairs of soluble organics with nanosilica in aqueous media.
abstract: Successive interaction of different pairs of water-soluble polymers (poly(ethylene glycol) (PEG), poly(vinyl pyrrolidone) (PVP), poly(vinyl alcohol) (PVA)), proteins (bovine serum albumin (BSA), ovalbumin, gelatin, and ossein), and smaller organics such as lecithin (1-stearoyl-2-oleoyl phosphatidylcholine, SOPC) and Aethonium (1,2-ethylene-bis(N-dimethyl carbodecyl oxymethyl) ammonium dichloride) with nanosilicas A-300 (S(BET)=232 and 297 m(2) g(-1)) and A-50 (S(BET)=52 m(2)g(-1)) was studied using dynamic light scattering, adsorption, and infrared (FTIR) spectroscopy methods. Time-dependent rearrangement of particle size distributions (PSDs) depicts appearance of both smaller and larger aggregates for silica/PEG(I-first adsorbate)/BSA(II-second adsorbate) and silica/PVP(I)/BSA(II) (i.e., BSA adsorbs onto PEG/silica or PVP/silica) than that for silica/organic compound I. However, in the cases of PVA(I)-BSA(II) and PVA(I)-SOPC(II) a similar effect is not observed because only increased aggregation occurs. The successive equilibrium adsorption of similar pairs shows a diminution of the adsorption of the second compound (gelatin, ovalbumin) with increasing amount of the first adsorbed polymer (PEG or PVP).
authors.affiliation: Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine. gun@voliacable.com
authors.forename: V M
authors.initials: VM
authors.lastname: Gun'ko
authors.forename: V I
authors.initials: VI
authors.lastname: Zarko
authors.forename: E F
authors.initials: EF
authors.lastname: Voronin
authors.forename: E V
authors.initials: EV
authors.lastname: Goncharuk
authors.forename: L S
authors.initials: LS
authors.lastname: Andriyko
authors.forename: N V
authors.initials: NV
authors.lastname: Guzenko
authors.forename: L V
authors.initials: LV
authors.lastname: Nosach
authors.forename: W
authors.initials: W
authors.lastname: Janusz