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Showing 1 to 20 of 53 for “"DLVO"”.
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Application of Extended DLVO Theory: Modeling of Flotation and Hydrophobicity of Dodecane
The extended DLVO theory was used to develop a flotation model by considering both hydrodynamic and surface forces involved in the process. A stream function was used to estimate the kinetic energies for thinning the water films between bubbles and particles, which were compared with the energy …
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Investigation of Non-DLVO Forces using an Evanescent Wave Atomic Force Microscope
… using evanescent waves, and applications to non-DLVO forces. An evanescent wave, generated at a solid-liquid interface, is scattered by AFM tips or particles attached to AFM cantilevers. The scattering of this wave is used to determine absolute separation between surfaces and/or the refractive …
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A study of hydrophobic interaction in fine particle coagulation
… Verwey, and Overbeek. This theory, known as DLVO theory, has gone through the test of time and survived as a pillar of colloid science. In the present work, this theory has been used for describing the behavior of fine coal and silica particles in aqueous media. It has been found, however, …
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A fundamental study of the selective hydrophobic coagulation process
… higher than those predicted by the classical DLVO theory, suggesting that it is driven by a hydrophobic interaction energy. Thus, the process is referred to as the selective hydrophobic coagulation (SHe) process. The fundamental development of this process is the focus of this study. In this …
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Hydrophobic Forces in Wetting Films
… model the rupture of the wetting films using the DLVO theory. In the present work, we have measured the kinetics of film thinning between air bubble and flat surfaces of gold and silica. The former was hydrophobized by ex-site potassium amyl xanthate, while the latter by in-site …
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Hydrophobic Forces in Free Thin Films of Water in the Presence and Absence of Surfactants
… at shorter separation distances. These non-DLVO forces may be attributed to the steric repulsion between asphaltenes extracted on the bitumen surface. The steric forces increased with pH and temperature, which may be explained by the increased solubilization of asphaltenes in water. The …
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Roles of surface interaction on Cryptosporidium parvum oocyst transport in subsurface environment
… where the Derjaguin–Landau–Verwey–Overbeek (DLVO) theory predicted maximum deposition. Charge heterogeneity was responsible for oocyst deposition on natural organic matter (NOM) surfaces and at lower ionic strength where the DLVO theory predicted zero deposition. To study the role of oocyst …
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Diffuse double-layer interaction for nonspherical colloidal particles
The DLVO theory of colloids is used to consider the stability of clay colloid particles. An approach to colloid physics using classical electrostatic methods is presented. Specifically, the electrical double layer is examined using computational methods. To this end, the Poisson-Boltzman equation …
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Visualization, Characterization, and Analysis of Gold Nanoparticles Fate and Transport in Aqueous Porous Media Environment with Advanced Photonics Technique
… theory or Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Surface-enhanced Raman spectroscopy (SERS) was developed as a new technique to investigate AuNP aggregation in water with varying salt levels. The SERS technique proved valuable as an analytical technique, elucidating information about …
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Colloidal phoretic motion
… sphere and Derjaguin–Landau–Verwey–Overbeek (DLVO) interactions in a drying film. Excluded volume diffusiophoresis is found to act to promote small-on-top stratification, causing fluxes of a similar magnitude to diffusion. The hard sphere interaction model predicted regimes with small- or …
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Quantitative analysis of protein liquid-liquid phase separation
… using Derjaguin- Landau-Verwey-Overbeek (DLVO) theory. It was achieved by constructing a Monte-Carlo model that can produce simulated scattering curves from interaction potential parameters, with a surrogate machine learning model that may produce comparable results within shorter time …
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Surface Forces in Foam Films
… from the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. The contribution from the non-DLVO force was estimated by subtracting the electrostatic double-layer and van der Waals forces from the total force (or pressure) measured. The results obtained in the present work suggest that a strong …
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Αδρανοποίηση και μεταφορά βιοκολλοειδών σε πορώδη μέσα
… συνθήκες με την εφαρμογή της θεωρίας DLVO. Στη συνέχεια εξετάστηκε η μεταφορά τριών υδατογενών μικροοργανισμών (Escherichia coli, MS2, και ΦX174), δεικτών κοπρανώδους μόλυνσης, σε εργαστηριακές x στήλες με πληρωτικό υλικό καθαρή χαλαζιακή άμμο. Εξετάστηκαν τρία διαφορετικά μεγέθη …
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Anti-Adhesive Si-and F-Doped DLC Coatings and Micro-Nanostructured Surfaces for Medical Implants
… with uncoated stainless steel. The extended DLVO theory was used to explain the bacterial adhesion mechanism. Quartz Crystal Microbalance technology (QCM-D), which is a simple, efficient, reliable, real time and information-rich method for measuring bacterial adhesion and related assesses, …
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The Design of Stable, Well-Defined Polymer-Magnetite Nanoparticle Systems for Biomedical Applications
… the modified Derjaguin-Verwey-Landau-Overbeek (DLVO) theory allowed the determination of the polymer loading and molecular weight necessary to sterically stabilize primary magnetite particles. Anchoring of polyethers to the magnetite nanoparticle surface was examined using three different types …
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Synthesis and Characterization of Novel Magnetite Nanoparticle Block Copolymer Complexes
… TEM, VSM, DLS and zeta potential measurements. DLVO calculation methods, which sum the contributions from van der Waals, steric, electrostatic and magnetic forces were utilized to examine the interparticle potentials in the presence and absence of external magnetic fields. Compositions were …
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ΦΥΣΙΚΟΧΗΜΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΓΑΛΑΚΤΩΜΑΤΩΝ ΚΟΡΕΣΜΕΝΩΝ ΥΔΡΟΓΟΝΑΝΘΡΑΚΩΝ Ε/Υ
… ΣΤΑΘΕΡΟΤΗΤΑΣ ΧΡΗΣΙΜΟΠΟΙΩΝΤΑΣ ΤΗΝ ΘΕΩΡΙΑ DLVO. ΥΠΟΛΟΓΙΣΤΗΚΑΝ ΜΕΡΙΚΕΣ ΧΡΗΣΙΜΕΣ ΠΑΡΑΜΕΤΡΟΙ. ΤΑ ΓΑΛΑΚΤΩΜΑΤΑ ΜΕ ΤΗΝ ΠΡΟΣΘΗΚΗ ΤΗΣ ΚΑΤΙΟΝΙΚΗΣ ΤΑΣΕΝΕΡΓΗΣ ΧΑΛΟΥΣΑΝ ΣΕ ΧΡΟΝΟΥΣ ΚΑΤΩ ΑΠΟ 1 Η, ΜΕ ΠΟΛΥ ΧΑΜΗΛΕΣ ΣΥΓΚΕΝΤΡΩΣΕΙΣ. ΑΠΟ ΜΕΤΡΗΣΕΙΣ ΔΙΕΠΙΦΑΝΕΙΑΚΩΝ ΤΑΣΕΩΝ ΥΠΟΛΟΓΙΣΤΗΚΕ Η ΣΧΕΤΙΚΗ ΕΠΙΦΑΝΕΙΑΚΗ …
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Development of a Flotation Rate Equation from First Principles under Turbulent Flow Conditions
… and hydrophobic) by use of the Extended DLVO theory. The model includes probabilities for attachment, detachment, and froth recovery as well as a collision frequency. A review of the effects fluids have on the flotation process has also been given. This includes collision frequencies, …
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Transport, Stability, and Deposition of Gold Nanoparticles in Porous Media
… fails to predict and explain this discrepancy. DLVO calculations suggested pore-space destabilization occurred in these experiments that were not accounted by CFT.
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A methodology for coupled CFD-DEM modeling of particulate suspension rheology
… particles. This combination is known as the DLVO force. Plain particles, with no DLVO forces, were also considered. To the author's knowledge, using a coupled CFD-DEM approach to model suspension rheology had never been attempted before. Therefore, it was decided the development of the model …
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