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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
Sublimation01:03

Sublimation

Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
Colloidal precipitates01:09

Colloidal precipitates

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...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
Freezing Point Depression and Boiling Point Elevation03:12

Freezing Point Depression and Boiling Point Elevation

Boiling Point Elevation
The boiling point of a liquid is the temperature at which its vapor pressure is equal to ambient atmospheric pressure. Since the vapor pressure of a solution is lowered due to the presence of nonvolatile solutes, it stands to reason that the solution’s boiling point will subsequently be increased. Vapor pressure increases with temperature, and so a solution will require a higher temperature than will pure solvent to achieve any given vapor pressure, including one...
Freezing Point Depression and Boiling Point Elevation01:24

Freezing Point Depression and Boiling Point Elevation

When a non-volatile solute is added to a pure solvent, it results in the lowering of the freezing point of the solvent. This phenomenon is called freezing point depression. The extent to which the freezing point is lowered depends on the molality of the solute -the number of moles of solute per kilogram of solvent and the cryoscopic constant of the solvent.From the plot of chemical potential, μ, against temperature, it is evident that the μ of both solid and liquid solvents decrease with...

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Updated: Jun 13, 2026

Plunge Freezing: A Tool for the Ultrastructural and Immunolocalization Studies of Suspension Cells in Transmission Electron Microscopy
13:35

Plunge Freezing: A Tool for the Ultrastructural and Immunolocalization Studies of Suspension Cells in Transmission Electron Microscopy

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Substrate-enhanced supercooling in AuSi eutectic droplets.

T U Schülli1, R Daudin, G Renaud

  • 1CEA, Institut Nanosciences et Cryogénie, SP2M, 17 rue des Martyrs, 38054 Grenoble, France. schulli@esrf.fr

Nature
|April 24, 2010
PubMed
Summary
This summary is machine-generated.

Supercooling in metals is hindered by atomic packing. This study shows gold-silicon interfaces stabilize liquid phases, revealing crucial solid-liquid interactions for crystallization processes.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Supercooling, the metastable liquid state below melting point, is theorized to be limited by atomic packing hindering crystal nucleation.
  • Solid surfaces can influence liquid layering, potentially affecting supercooling, but direct experimental evidence of surface-induced lateral order is lacking.

Purpose of the Study:

  • To experimentally investigate the relationship between surface-induced lateral order and supercooling in metallic systems.
  • To elucidate the role of solid-liquid interactions in stabilizing the liquid phase at interfaces.

Main Methods:

  • Utilized in situ X-ray scattering to observe atomic arrangements at the interface.
  • Employed ab initio molecular dynamics simulations to analyze liquid phase behavior and atomic interactions.
  • Studied gold-silicon (AuSi) eutectic droplets on a reconstructed silicon (Si(111)) substrate.

Main Results:

  • Observed enhanced supercooling in AuSi droplets due to a gold-induced (6 x 6) reconstruction of the Si(111) surface.
  • Identified pentagonal atomic arrangements of gold at the interface, promoting lateral ordering and stabilization of the liquid phase.
  • Demonstrated a direct link between interface structure and the stabilization of the adjacent liquid layers.

Conclusions:

  • Solid-liquid interactions significantly influence the structure of liquid layers at interfaces, impacting supercooling.
  • The findings highlight the importance of interface engineering for controlling material properties and processes.
  • This research has implications for technologies involving soldering, casting, microfluidics, and nanowire growth.