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Quartz crystal microbalance with dissipation monitoring (QCM-D) was used to investigate the fundamental interactions between wood extractives and surfaces used in papermaking. Experiments were carried out at 25°C and 50°C on a microcrystalline cellulose-coated surface (a surrogate for paper) and a chromium surface (a surrogate for metal surfaces in paper machines and printing presses) using colloids...
Saponins are natural surfactants with non-trivial surface and aggregation properties which find numerous important applications in several areas (food, pharma, cosmetic and others). In the current paper we study the surface properties of ten saponin extracts, having different molecular structure with respect to the type of their hydrophobic fragment (triterpenoid or steroid aglycone) and the number...
We investigated the dependence of the apparent slip length (β) on the particle concentration for suspensions of colloidal hard spheres flowing through microchannels with smooth walls. Hydrostatic pressure was used to pump monodisperse suspensions of 1μm silica spheres in water–glycerol mixture through a poly(dimethylsiloxane) microchannel with rectangular cross section. Confocal scanning laser microscopy...
The cationic spherical polyelectrolyte brushes (CSPB), with poly(2-(acryloyloxy) ethyltrimethylammonium chloride) chains grafted from the surfaces of colloidal silica particles were prepared and evaluated. The CSPB was characterized by Fourier-transform infrared spectrometry, thermo gravimetric analysis, colloid titration, gel permeation chromatography, transmission electron microscopy and X-ray photoelectron...
Tannic acid and other polyphenols adsorb spontaneously on almost all kinds of surfaces to yield hydrophilic coatings. However, the deposition kinetics of tannic acid as a function of its solution concentration has not yet been well characterized. Such fundamental aspects are of the highest importance for the protection against corrosion and other applications. Herein, it is shown by means of quartz...
Herein, the development of a colorimetric probe for selective detection of hypochlorite ion (ClO−) using cetylpyridinium bromide (CPB) capped silver nanoparticles (CPB-AgNPs) in aqueous solution is reported. The absorbance of the CPB-AgNPs was significantly decreased in presence of ClO− resulting in the color change from yellowish brown to colorless due to inducing aggregation of CPB-AgNPs with ClO...
In this work, non-equilibrium molecular dynamics (NEMD) is used to simulate simple shear flow of associative polymer solutions of the telechelic and multi-sticker types. The objective of the work is the analysis of the effect of the hydrophobic groups of these polymers on the rheological behavior of the system. To generate the flow, the equations of motion are coupled to boundary conditions of Lees...
The kinetic of the ageing process of 3 pyrogenic silica samples, exhibiting increasing surface areas (Wacker N20, T30 and T40), was followed through gravimetric measurements, during about 1000h at 22.5°C, under different relative humidities (RH) from 62% up to100%. Silanol chemical titration, and IR spectroscopy were also called on to evidence the change of the surface chemistry induced by the ageing...
When an aqueous platinum chloride or mixed rhodium and platinum chloride solutions are added to a mixture of lecithin, AOT and titanium isopropoxide (TIP) in isooctane, the surfactants partition the aqueous and oil phases into a nanoscale bicontinuous microstructure. Hydrolysis and condensation of the TIP generates a highly connected porous anatase support. Reduction of the metal salt/s in the confined...
We numerically investigated the demulsification phenomena of oil-in-water (O/W) emulsions using a membrane coalescence process. We simulated the permeation of O/W emulsions through a membrane with a single straight pore using our numerical framework based on the coupled level set and volume-of-fluid (CLSVOF) method. With a low droplet volume fraction, small droplets, and a large pore size, the oil...
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