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Showing 1 to 20 of 32 for “"DLVO theory"”.
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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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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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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
… predicted by traditional colloidal filtration 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 …
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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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A study of hydrophobic interaction in fine particle coagulation
A stability theory for lyophobic colloids was put forth in the 1940’s by Derjaguin, Landau, 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 …
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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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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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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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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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Studies on the stability of thin films in bubble-particle adhesion
… the bubble-particle adhesion process using the DLVO theory modified to include interaction energies due to structural forces. The calculations required knowledge of the values of various parameters such as, H<sub>C</sub>, zeta potentials, and Hamaker constants for both bubbles and particles. The …
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Adhesion of silver nanoparticle amendments to ceramic water filters
… classic Derjaguin, Landau, Verwey and Overbeek (DLVO) theory, steric forces, and particle-particle interaction energy calculations. A multilevel statistical model was built to describe the removal of Ag NPs from ceramic water filters under different water conditions. The type of Ag NP was found …
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Nanomaterials from lignocellulosic biomass : tailorable synthesis via surface functionalization and self-assembly mechanisms
… applying Derjaguin-Landau-Verwey-Overbeek's (DLVO) theory and population balance equation was developed to predict the particle size of LNPs formed in different conditions. Secondly, a diol-based DES pretreatment platform was developed for efficient switchgrass fractionation and lignin …
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Direct Force Measurement between Surfaces Coated with Hydrophobic Polymers in Aqueous Solutions and the Separation of Mixed Plastics by Flotation
… force) that cannot be explained by the classical DLVO theory. The surface force measurements were conducted in pure water and in solutions of surfactant (alkyltrimethylammonium chloride) and a salt (NaCl). In pure water, the attractive forces were much stronger than van der Waals force. In 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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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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Effects of long-chain surfactants, short-chain alcohols and hydrolyzable cations on the Hydrophobic and Hydration Forces
The DLVO theory states that the interaction between two lyophobic particles in aqueous media can be predicted by the sum of two surface forces, i.e., the electrical double-layer and van der Waals forces. This theory, which was developed 50 years ago, served as a backbone for colloid chemistry. …
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Development and Evaluation of NI-P-PTFE Based Nano-Composite Coatings for Medical Devices
… and removal were also investigated. Extended DLVO theory also explained why some coatings adhered less bacteria than others by analysing total interaction energy between bacteria and the coatings. While in the corrosion test, open circuit potential, polarization resistance (Rp), corrosion …
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Aggregation Effects on the Rheological, Sedimentation, and Drying Behavior of Colloidal Silica Suspensions
… importance of extending classical models (i.e., DLVO theory) for predicting interparticle interactions to account for short-range structural contributions.
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