Deposition of particles while flowing past constrictions is a ubiquitous phenomenon observed in diverse systems. Some common examples are jamming salt crystals near the orifice saltshakers, clogging filter systems, gridlock vehicular traffic etc. Our work investigates deposition events colloidal microspheres over microstructured barriers microfluidic devices. The interplay DLVO, contact and hyd...

Background: Access to safe drinking water remains a global issue with fecal indicator bacteria being major pollutants. Biochars offer low-cost adsorbents for bacterial pathogens. A fundamental understanding of how biochars interact pathogens is essential designing effective biofilters. Methods: Water-saturated sand columns amended Magnesium and Nitrogen-doped produced by pyrolysis at 400, 500, ...

We study charged nanoparticles adsorbed onto surfactant bilayers using small-angle scattering of synchrotron radiation. The in-plane interaction of the particles is well described by a DLVO component (measured independently in solution) and a repulsive dipolar interaction due to the presence of the interface, with an amplitude close to the theoretical prediction. We prove that charged nanoparti...

Nanoparticle transport in natural settings is complex due to interactions with the surrounding environment. In this study, the impact of UVA irradiation and humic acid (HA) on deposition of aqueous fullerene nanoparticles (nC60) on a silica surface as a surrogate for natural sediments was studied using packed column experiments and quartz crystal microbalance with dissipation monitoring under v...

Toward understanding intermolecular interactions governing self-association of proteins, the present study investigated a model protein, myoglobin, using a small-angle X-ray scattering technique. It has been known that removal of the heme makes myoglobin aggregation-prone. The interparticle interferences of the holomyoglobin and the apomyoglobin were compared in terms of the structure factor. A...

When studying the colloidal stability of an immunolatex formed by F(ab')2 protein fragments and a polystyrenepolychloromethylstyrene copolymer, striking results were obtained. After the expected particle aggregation induced by an increase in the electrolyte concentration (KBr), subsequent restabilization occurred when this electrolyte concentration was increased even more. This non-DLVO behavio...

Langmuir's disjoining pressure between two flat, charged planes was calculated analytically for strongly overlapping double layers in the limit of zero electric field between the planes. The resulting repulsion has a long-range algebraic decay that stems from the thermodynamic equilibrium between homogeneously distributed interplate ions and ions in the surrounding electrolyte reservoir. Togeth...