Colloidal Stability of Silica-Modified Magnetite Nanoparticles: Comparison of Various Dispersion Techniques

Abstract

The production of stable and homogeneous batches during nanoparticle fabrication is challenging. Surface charging, as a stability determinant, was estimated for 3-aminopropyltriethoxysilane (APTES) coated pre-formed magnetite nanoparticles (MNPs). An important consideration for preparing stable and homogenous MNPs colloidal systems is the dispersion stage of pre-formed samples, which makes it feasible to increase the MNP reactive binding sites, to enhance functionality. The results gave evidence that the samples that had undergone stirring had a higher loading capacity towards polyanions, in terms of filler content, compared to the sonicated ones. These later results were likely due to the harsh effects of sonication (extremely high temperature and pressure in the cavities formed at the interfaces), which induced the destruction of the MNPs.

Origin of Enhancement of Orbital Magnetic Moment in SiO2-Coated Fe3O4 Nanocomposites Studied by X-ray Magnetic Circular Dichroism

“…The zeta potential is an essential parameter to find out the strength and interaction type of the dispersed particle. It is generally determined by theoretical models involved with experimentally calculated electrophoretic mobility. , A related factor known as the electrokinetic potential is determined from the electrophoretic potential through the “Smoluchowski equation”. , Electrophoretic mobility ( U e ) is given by U e = true U H where U refers to the linear velocity of the transfer in the dispersive medium (m/s) and H is the involved electric strength (V/m). To ensure the stability of the dispersed NPs in water or any other liquid solution, repulsion with short-range force is necessary to maintain the discrete nature of each particle and to anticipate further agglomeration .…”

“…It is generally determined by theoretical models involved with experimentally calculated electrophoretic mobility. 33,34 A related factor known as the electrokinetic potential is determined from the electrophoretic potential through the "Smoluchowski equation". 34,35 Electrophoretic mobility (U e ) is given by…”

Synthesis and Enhanced Oil Recovery Potential of the Bio-Nano-Oil Displacement System

“…Researchers have also improved the oil displacement efficiency of chemical enhanced oil recovery (CEOR) through the synergistic effect of nanoparticles and traditional chemical enhanced oil recovery (CEOR) materials. , However, the stable dispersion, high input ratio, and compatibility with other agents of NPs are still the main factors restricting the application of NPs to EOR. Reducing the cost of NPs, improving the compatibility of NPs with other oil-displacing agents, and enhancing the stable dispersion in the system are the objectives of the present study. − …”