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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...
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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
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Recrystallization: Solid–Solution Equilibria01:10

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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...
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Preparation of Binary and Ternary Deep Eutectic Systems
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Presolidification in Eutectic Droplets.

Bene Poelsema1, Zhiguo Zhang1, Harold J W Zandvliet1

  • 1Physics of Interfaces and Nanomaterials, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, Netherlands.

Physical Review Letters
|September 22, 2023
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Summary
This summary is machine-generated.

Presolidification, the opposite of premelting, influences the movement of germanium-platinum (Ge-Pt) droplets. Droplet motion direction unexpectedly shifts to align with the substrate

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Area of Science:

  • Materials Science
  • Surface Science
  • Physics

Background:

  • Premelting describes surface disordering of solids at temperatures below melting.
  • Presolidification is the analogous phenomenon occurring at the liquid-solid interface, influencing material behavior.
  • Understanding interface phenomena is crucial for controlling material properties and processes.

Purpose of the Study:

  • To investigate the phenomenon of presolidification in eutectic Germanium-Platinum (Ge-Pt) droplets on a Germanium (Ge) substrate.
  • To determine the influence of presolidification on the thermal gradient driven motion of these droplets.
  • To explore the relationship between droplet morphology and motion direction.

Main Methods:

  • Utilizing a substrate of Germanium (Ge) with a (110) surface orientation.
  • Observing the behavior of micron-sized eutectic Ge-Pt droplets under controlled thermal gradients.
  • Analyzing droplet motion direction and shape changes at temperatures near and above the eutectic temperature (T_C).

Main Results:

  • At temperatures well above T_C, droplets moved towards the heat source regardless of substrate orientation.
  • A distinct transition occurred at 90 K above T_C, with droplets exhibiting a strong preference for motion along the [001] azimuth.
  • This directional motion was accompanied by a change in droplet shape from compact to elongated along the [001] direction.
  • The observed behavior was attributed to presolidification effects at the liquid-solid interface.

Conclusions:

  • Presolidification significantly impacts the directional motion of eutectic Ge-Pt droplets on Ge(110) substrates.
  • The phenomenon dictates a transition in droplet movement from thermophilic to anisotropic motion.
  • This finding provides new insights into interfacial phenomena and their role in material transport.