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Types of Coprecipitation

Types of Coprecipitation

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...

Preparation of Samples for Electron Microscopy

Preparation of Samples for Electron Microscopy

To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...

Colloidal precipitates

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...

Surface Tension, Capillary Action, and Viscosity

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...

Precipitate Formation and Particle Size Control

Precipitate Formation and Particle Size Control

In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...

Excess Pressure Inside a Drop and a Bubble

Excess Pressure Inside a Drop and a Bubble

The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.

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Related Experiment Video

Updated: Oct 30, 2025

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

Published on: August 15, 2018

Surface coating captures droplets.

Claire Ashworth¹

¹Nature Reviews Chemistry, http://www.nature.com/natrevchem/.

Nature Reviews. Chemistry

|July 5, 2021

Summary

A novel polymer coating derived from cosmetic ingredients can be applied to various surfaces. This innovation captures airborne droplets, effectively reducing the spread of infectious respiratory diseases.

Area of Science:

Polymer Science
Materials Science
Public Health

Background:

Infectious respiratory diseases spread via airborne droplets.
Current mitigation strategies have limitations.
Need for innovative surface-based interventions.

Purpose of the Study:

To develop a polymer coating for capturing airborne droplets.
To assess the coating's efficacy in mitigating disease transmission.
To utilize cosmetic-based ingredients for a safe and accessible solution.

Main Methods:

Formulation of a polymer coating using cosmetic-based ingredients.
Application of the coating to diverse surfaces.
Testing the coating's droplet capture efficiency.

Keywords:

Environmental chemistry Pollution remediation Polymers

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Last Updated: Oct 30, 2025

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

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Published on: August 15, 2018

A Protocol for the Production of Gliadin-cyanoacrylate Nanoparticles for Hydrophilic Coating

A Protocol for the Production of Gliadin-cyanoacrylate Nanoparticles for Hydrophilic Coating

Published on: July 8, 2016

Enhancement Method of Surface Acoustic Wave-Atomizer Efficiency for Olfactory Display

Enhancement Method of Surface Acoustic Wave-Atomizer Efficiency for Olfactory Display

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Evaluating the impact on airborne pathogen transmission.

Main Results:

The polymer coating demonstrated significant airborne droplet capture capabilities.
Application on various surfaces proved feasible.
The coating effectively reduced the potential for disease transmission.

Conclusions:

A polymer coating from cosmetic ingredients offers a promising approach to reduce respiratory disease spread.
This surface-based technology can be applied widely.
Further research can optimize the coating for enhanced public health applications.