Abstract Ultrafiltration of high‐purity grade bovine serum albumin has been carried out under various temperature between 5 and 30°C at cross‐flow velocities, pressures, concentrations with the aim studying protein denaturation its consequences on process. Three different pump heads have tested. Denaturation proteins in solution monitored by laser light scattering size exclusion chromatography. The rate increases temperature, cross‐flow, time. It is observed that membrane fouling whether...

Increasing the particle density of a suspension microgel colloids above point random-close packing, must involve deformations to accommodate increase in volume fraction. By contrast isotropic osmotic deswelling soft particles, particle-particle contacts give rise non-homogeneous pressure, raising question if these occur through homogeneous or by formation facets. Here we aim answer this combination imaging individual microgels dense packings and simple model describe balance between shape...

Abstract This work describes a novel strategy for surface functionalization, the aim of which is to significantly increase lifetime an electrochemical sensor dedicated Hg(II) trace determination. In order tailor stable mixed organic/inorganic interfaces, gold nanoparticles were electrodeposited onto glassy carbon electrode previously functionalized by thick 4‐thiophenol diazonium film, affords good anchoring nanoparticles. AFM and FEG‐SEM used characterize film thickness average size...

We have developed a microfluidic chip for the osmotic compression of samples at nanoliter scale, enabling in situ and operando acquisition structural features through small-angle X-ray scattering throughout process. The design builds upon previous setup allowing high-throughput measurements with minimal sample quantities. updated is specifically tailored compatibility laboratory beamline, taking into account factors such as reduced photon flux increased beam size compared to synchrotron...

Aqueous dispersions of nanometric clay platelets (Laponite) have been dewatered through different techniques: centrifugation, mechanical compression, and osmotic stress (dialysis against a polymer solution). The positional orientational correlations the particles determined small-angle neutron scattering. Uniaxial compression experiments produce concentrated (volume fraction > 0.03) in which strong correlations. cause to align with their normal along common axis, is axis compression. be...

Aqueous dispersions of latex particles have been aggregated by addition Ca2+ ions and then filtered in a pressure filtration cell. The cakes examined through small-angle neutron scattering, void volume fraction measurements, permeate flux measurements. At all pressures (20−400 kPa), the were extensively collapsed (latex fractions φ = 0.27−0.46), remaining porosity had tenuous structure (fractal dimensions df 1.3−1). However, local structures remained same as aggregates original suspensions....

The compressive yield stress of particle gels shows a highly nonlinear dependence on the packing fraction. We have studied continuous compression processes, and discussed fraction with scale rearrangements. 2D simulation uniaxial was applied to fractal networks, required stresses were evaluated for wide range fractions that approached close packing. acts reduce size characteristic structural entities (i.e. correlation length structure). observed three stages compression: (I) elastic-dominant...

This work started as part of an investigation into the mechanisms by which fine zirconia aqueous dispersions can be processed for ceramic materials engineering. Aqueous TZ3Y particles obtained dispersion dry powder in acidic solutions (pH 3) have been subjected to compression through osmotic experiments. The results show a behavior that is unusual when compared with classical colloidal dispersions. Indeed, 50 nm are well dispersed and protected from aggregation electrical double layers, high...

The cell model is a ubiquitous, fast, and relatively easily implemented used to estimate the osmotic pressure of colloidal dispersion. It has been shown yield accurate approximations in dispersions with low salt content. generally accepted that it performs well when long-ranged interactions are involved structure dispersion solidlike. aim present work determine quantitatively error committed by assuming computed real To this end, pressures compared correct estimation actual obtained from...