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Related Concept Videos

Colloids03:22

Colloids

21.2K
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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IR Absorption Frequency: Delocalization01:04

IR Absorption Frequency: Delocalization

1.4K
Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...
1.4K
Phase Transitions02:31

Phase Transitions

23.2K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
23.2K
Colloids and Suspensions01:17

Colloids and Suspensions

3.5K
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...
3.5K
Properties of Transition Metals02:58

Properties of Transition Metals

29.9K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.9K
Colloidal precipitates01:09

Colloidal precipitates

6.5K
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...
6.5K

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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

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Probing interface localization-delocalization transitions by colloids.

Svyatoslav Kondrat1, Oleg A Vasilyev2,3, S Dietrich2,3

  • 1Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 5, 2018
PubMed
Summary
This summary is machine-generated.

Interface localization-delocalization transitions (ILDTs) in confined fluids can now be detected experimentally. Colloids reveal vivid force changes indicating these transitions, overcoming previous observation challenges.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Interface localization-delocalization transitions (ILDTs) occur in confined two-phase fluids with competing wall preferences.
  • These transitions, where an interface moves between walls with changing temperature, are theoretically studied but experimentally unobserved.
  • Experimental detection is challenging due to the need to resolve fine fluid structure details.

Purpose of the Study:

  • To propose a novel experimental method for detecting ILDTs in confined fluids.
  • To utilize colloids as indicators for these transitions.
  • To provide an accessible experimental signature for ILDTs.

Main Methods:

  • Mean field theory calculations.
  • Monte Carlo simulations of the Ising model.
  • Analysis of colloid-environment interactions within the confined fluid.

Main Results:

  • Colloids experience significant changes in finite-size and fluctuation-induced forces near ILDTs.
  • A vivid force change occurs when the interface localizes at a wall upon decreasing temperature.
  • This force variation serves as a detectable experimental signal.

Conclusions:

  • Colloids can act as effective probes for detecting ILDTs in confined fluid systems.
  • The proposed method offers a more accessible experimental route to observe these transitions.
  • This research bridges theoretical predictions with potential experimental validation.