Bistable colloidal orientation in polar liquid near a charged wall.

08:00 EDT 4th October 2019 | BioPortfolio

Summary of "Bistable colloidal orientation in polar liquid near a charged wall."

We examine the translation and rotation of an uncharged spheroidal colloid in polar solvents (water) near a charged flat surface. We solve the nonlinear Poisson-Boltzmann equation outside of the colloid in two dimensions for all tilt angles θ with respect to the surface normal. The colloid's size is assumed to be comparable to the Debye's length and hence field gradients are essential. The Maxwell stress tensor, including the ideal gas pressure of ions, is integrated over the colloid's surface to give the total force and torque on the colloid. From the torque we calculate the effective angular potential U(θ). The classical behavior where the colloid tends to align in the direction perpendicular to the surface (parallel to the field, θ=0) is retrieved at large colloid-surface distances or small surface potentials. We find a surprising transition whereby at small separations or large potentials the colloid aligns parallel to the surface (θ=90°). Moreover, this colloid orientation is amplified at a finite value of the aspect ratio. This transition may have important consequences to flow of colloidal suspensions or as a tool to switch layering of such suspensions near a surface.


Journal Details

This article was published in the following journal.

Name: Journal of colloid and interface science
ISSN: 1095-7103
Pages: 45-50


DeepDyve research library

PubMed Articles [6712 Associated PubMed Articles listed on BioPortfolio]

Polyelectrolyte Microgels at a Liquid-Liquid Interface: Swelling and Long-Range Ordering.

In this work we studied the behavior of charged microgels at a liquid-liquid interface by means of dissipative particle dynamics simulations with explicit electrostatic interactions; the liquids repre...

Enhancing metal separations by liquid-liquid extraction using polar solvents.

The less polar phase of liquid-liquid extraction systems has been studied extensively for improving metal separations, however, the role of the more polar phase has been overlooked for far too long. H...

Structure and rheology of liquid crystal hydroglass formed in aqueous nanocrystalline cellulose suspensions.

Liquid crystal hydroglass (LCH) is a biphasic soft material with flow programmable anisotropy that forms via phase separation in suspensions of charged colloidal rods upon increases in ionic strength....

Electric-Alignment Immobilization of Liquid Crystalline Colloidal Nanosheets with the Aid of a Natural Organic Polymer.

Inorganic nanosheets obtained by exfoliation of layered crystal in water form colloidal liquid crystals, and their alignment can be controlled by an electric field. In order to realize the immobilizat...

Liquid-liquid criticality in the dielectric constant and refractive index: A perspective.

The critical region in the phase diagram of condensed matter systems such as fluids or fluid mixtures is characterized by the anomalous behaviour of specific thermodynamic properties. Here, we discuss...

Clinical Trials [1894 Associated Clinical Trials listed on BioPortfolio]

Clinical Study to Evaluate the Efficacy of Ectoin® Containing Eye Spray for Treatment of Dry Eye Disease

Subjective and objective evaluation of the efficacy and tolerability of preservative-free "Ectoin® Eye Spray - Colloidal" and comparison of the efficacy and tolerability between "Ectoin®...

Silver Nanoparticle Investigation for Treating Chronic Sinusitis

Chronic rhinosinusitis is a highly prevalent disease resulting in high economic burden. Effective therapeutic options are needed. Rhinosinusitis-related biofilms are a likely contributor t...

Health Wearables and College Student Health

The purpose of this pilot randomized trial is to determine (1) the effectiveness of the Polar M400, used in combination with a twice-weekly Facebook-delivered Social Cognitive Theory-based...

Single Dose Escalations Study of Amphotericin B Colloidal Dispersion In Healthy Subjects in China

The purpose of this trial is to evaluate the pharmacokinetics of single intravenous of Amphotericin B Colloidal Dispersion(ABCD)in Chinese healthy subjects.

Trial to Determine the Therapeutic Benefit of an OTC Cream on Dry, Itchy Skin of Adults and Children With Eczema

The objective of this 1 week trial is to evaluate the efficacy of an over-the-counter (OTC) 1% colloidal oatmeal skin protectant cream in adults and children with mild to moderate AD.

Medical and Biotech [MESH] Definitions

Colloids with liquid continuous phase and solid dispersed phase; the term is used loosely also for solid-in-gas (AEROSOLS) and other colloidal systems; water-insoluble drugs may be given as suspensions.

The removal of a soluble component from a liquid mixture by contact with a second liquid, immiscible with the carrier liquid, in which the component is preferentially soluble. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Minute cells produced during development of an OOCYTE as it undergoes MEIOSIS. A polar body contains one of the nuclei derived from the first or second meiotic CELL DIVISION. Polar bodies have practically no CYTOPLASM. They are eventually discarded by the oocyte. (from King & Stansfield, A Dictionary of Genetics, 4th ed)

A subclass of GLYCOSPHINGOLIPIDS containing large polar heads made up of several sugar units. One or more of their terminal sugar units are bound to a negatively charged molecule at pH 7. Members of this class include: GANGLIOSIDES, uronoglycosphingolipids, SULFOGLYCOSPHINGOLIPIDS, phosphoglycosphingolipids, and phosphonoglycosphingolipids.

A chromatography technique in which the stationary phase is composed of a non-polar substance with a polar mobile phase, in contrast to normal-phase chromatography in which the stationary phase is a polar substance with a non-polar mobile phase.

Quick Search

DeepDyve research library

Relevant Topic

Stress is caused by your perception of situations around you and then the reaction of your body to them. The automatic stress response to unexpected events is known as 'fight or flight'. Discovered by Walter Cannon in 1932, it is the release of h...

Searches Linking to this Article