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The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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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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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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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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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Shearing Stress01:18

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Shearing stress, denoted by the Greek letter tau (τ), is stress caused by forces acting transversely on an object. These forces create internal ones within the entity in the plane where the external forces are applied. The resultant of these internal forces is the shear in the section.
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Colloidal Plastic Crystals in a Shear Field.

Fangfang Chu1,2, Nils Heptner1,2, Yan Lu2

  • 1†Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary
This summary is machine-generated.

We investigated colloidal dumbbell crystals under shear, revealing a new phase with partial orientation. This impacts phase transitions and causes unique yielding behavior in these anisotropic materials.

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Area of Science:

  • Colloidal science
  • Materials science
  • Soft matter physics

Background:

  • Colloidal crystals exhibit complex phase behavior under external fields.
  • Anisotropic particles like dumbbells present unique structural and rheological challenges compared to spheres.
  • Understanding nonequilibrium phase transitions is crucial for designing advanced materials.

Purpose of the Study:

  • To investigate the structural and viscoelastic properties of 3D plastic crystals formed by colloidal dumbbells under oscillatory shear.
  • To identify and characterize novel phases and transitions in sheared colloidal dumbbell systems.
  • To compare the shear response of colloidal dumbbells with that of hard spheres.

Main Methods:

  • Rheo-small-angle neutron scattering (rheo-SANS) experiments to probe structure under shear.
  • Brownian dynamics computer simulations to model particle behavior.
  • Utilizing sterically stabilized dumbbell-shaped microgels (polystyrene cores, PNIPAM shells) as model systems.

Main Results:

  • A discontinuous phase transition was observed from a twinned-fcc-like crystal to a partially oriented sliding-layer phase, with a shear-molten state in between.
  • The novel sliding-layer phase exhibits a small, finite orientational order of dumbbells along the shear direction.
  • The shear response of dumbbells shows a unique two-step yielding process, distinct from the single yielding event in hard spheres.

Conclusions:

  • The weak orientational order in the sliding-layer phase significantly perturbs the nonequilibrium phase transition.
  • Colloidal dumbbells display a distinct yielding mechanism compared to hard spheres due to their anisotropy.
  • Findings aid in interpreting shear responses of anisotropic colloids and designing colloidal crystals for applications like photonics.