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Related Concept Videos

Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Solubility03:00

Solubility

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Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules,...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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The Paradoxical Behavior of Rough Colloids at Fluid Interfaces.

Md Anisur Rahman1, Peter J Beltramo1

  • 1Department of Chemical Engineering, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.

ACS Applied Materials & Interfaces
|June 26, 2024
PubMed
Summary
This summary is machine-generated.

Surface roughness paradoxically impacts colloidal particle interactions at fluid interfaces. While enhancing deformation in spheres, it weakens it in ellipsoids, offering new avenues for particle surface engineering.

Keywords:
anisotropic colloidscapillarityfluid interfacesinterfacial phenomenapolymer colloidsrough particlessurface topography

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Area of Science:

  • Colloid and interface science
  • Materials science
  • Polymer science

Background:

  • Colloidal particles stabilize interfaces via strong adsorption, with contact angle determining behavior.
  • Particle surface roughness or shape anisotropy can cause undulated contact lines, leading to quadrupolar interfacial deformation and capillary interactions.

Purpose of the Study:

  • To investigate the paradoxical impact of surface roughness on interfacial deformation and capillary interactions of spherical and ellipsoidal polymer colloids.
  • To understand how surface roughness influences wetting behavior and capillary forces for different particle shapes.

Main Methods:

  • Synthesized spherical and ellipsoidal polymer colloids with controlled surface roughness using seeded emulsion polymerization.
  • Measured in situ interfacial deformation around individual colloids at an air-water interface.
  • Employed numerical predictions to analyze interfacial deformation and capillary interactions.

Main Results:

  • Surface roughness strengthened quadrupolar deformation in spheres, consistent with theory.
  • Conversely, surface roughness weakened quadrupolar deformation in ellipsoids.
  • Increased roughness led to more hydrophilic particles and decreased apparent contact angles for both shapes.
  • Numerical predictions confirmed that decreased wetting explains reduced interfacial deformation in ellipsoids.

Conclusions:

  • Surface roughness has a shape-dependent, paradoxical effect on interfacial deformation and capillary interactions.
  • Particle surface engineering can tune capillary deformation and interactions by altering wetting behavior and capillary pinning, particularly for asymmetric particles.