Chung, Eunhyea Yiacoumi, Sotira Halbert, Candice Ankner, John Wang, Wei Kim, Changwoo Tsouris, Costas 2024-01-20T15:02:10Z 2024-01-20T15:02:10Z 2021-09-05 2012-04-17 0013-936X https://pubs.kist.re.kr/handle/201004/129328 Neutron reflectometry (NR) was employed to study the interaction of nanosized silica particle:: with a flat silica surface in aqueous solutions. Unlike other experimental tools that are used to study surface interactions, NR can provide information on the particle density profile in the solution near the interface. Two types of silica particles (25 and 100 nm) were suspended in aqueous solutions of varying ionic strength. Theoretical calculations of the surface interaction potential between a particle and a flat silica surface using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory were compared to the experimental data. The theory predicts that the potential energy is highly dependent on the ionic strength. In high ionic strength solutions, NR reveals a high concentration of particles near the flat silica surface. Under the same conditions, theoretical calculations show an attractive force between a particle and a flat surface. For low ionic strength solutions, the particle concentration near the surface obtained from NR is the same as the bulk concentration, while depletion of particles near the surface is expected because of the repulsion predicted by the DLVO theory. English American Chemical Society QUARTZ-CRYSTAL MICROBALANCE X-RAY AGGREGATION DEPOSITION REFLECTIVITY NANOMATERIALS SUSPENSIONS ENVIRONMENT FABRICATION KINETICS Interaction of Silica Nanoparticles with a Flat Silica Surface through Neutron Reflectometry Article 10.1021/es203992b 1 Environmental Science & Technology, v.46, no.8, pp.4532 - 4538 Environmental Science & Technology 46 8 4532 4538 scie scopus 000302850300038 2-s2.0-84859813438 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article QUARTZ-CRYSTAL MICROBALANCE X-RAY AGGREGATION DEPOSITION REFLECTIVITY NANOMATERIALS SUSPENSIONS ENVIRONMENT FABRICATION KINETICS