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Related Concept Videos

Precipitation Processes01:12

Precipitation Processes

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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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Types of Coprecipitation01:10

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
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Types of Membrane Protrusions01:28

Types of Membrane Protrusions

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The protrusion of the cell surface is an initial step for several cellular processes, including cell migration, phagocytosis, and neurite outgrowth. These membrane protrusions are a result of cytoskeletal rearrangement. The most  widely observed cell protrusions include lamellipodia, pseudopodia, filopodia, microvilli, invadopodia, and podosomes. These protrusions can be of two types — static or dynamic.
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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Investigations into precipitation membrane growth.

Nathan Tompkins1, Raymond J Arebalo1, Gabriel Brandenburg1

  • 1Physics Department, Wabash College, Crawfordsville, Indiana 47933, USA.

The Journal of Chemical Physics
|December 4, 2025
PubMed
Summary

Researchers studied metal hydroxide precipitation membranes in a microfluidic device. Applying an opposing electric potential reduced membrane growth, suggesting selective ion permeability controls formation.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Origin of Life Studies

Background:

  • Natural precipitation membranes at deep-sea hydrothermal vents generate electric potential.
  • These structures are hypothesized to be relevant to the origin of life on Earth.
  • Synthetic membranes are used to study precipitation membrane growth in laboratory settings.

Purpose of the Study:

  • To investigate the formation of metal hydroxide precipitation membranes in a microfluidic device.
  • To measure the electric potential generated during membrane formation.
  • To explore the influence of applied electric potential on membrane growth rates.

Main Methods:

  • Fabrication of a microfluidic device for precipitation membrane formation.
  • In-situ measurement of electric potential across the membrane during growth.
  • Controlled application of opposing electric potential to study growth rate modulation.
  • Measurement of growth curves for nickel, iron, and cobalt hydroxide membranes.

Main Results:

  • Successfully formed metal hydroxide precipitation membranes (Ni(OH)2, Fe(OH)2, Co(OH)2) in a microfluidic device.
  • Measured electric potential generation across the membranes during formation.
  • Experimentally verified that an opposing electric potential reduces membrane growth rate.
  • Hypothesized that selective permeability to positive ions (e.g., H+) controls growth.

Conclusions:

  • The growth of metal hydroxide precipitation membranes is influenced by electric potential.
  • Selective ion permeability, likely for H+, plays a key role in regulating membrane growth.
  • Microfluidic devices are effective tools for studying precipitation membrane formation and electrical properties.
  • Further research involving direct electrical measurements and material characterization is recommended.