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Related Concept Videos

Colloids03:22

Colloids

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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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The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ...
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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...
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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Related Experiment Video

Updated: Jun 28, 2025

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
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Fluorocarbon Nanodroplets: Their Formation and Stability in Complex Solution Systems.

Yuwen Ji1,2, Jin Zheng1,2, Zhanli Geng3,4

  • 1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 18, 2024
PubMed
Summary
This summary is machine-generated.

Researchers explored perfluorohexane nanodroplets (NDs) stability in electrolytes. Electrolyte ion concentration and valence critically control ND formation and stability, enabling tailored applications in biotechnology and medicine.

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Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets
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Formulation and Acoustic Modulation of Optically Vaporized Perfluorocarbon Nanodroplets

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Area of Science:

  • Biotechnology and Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Perfluorocarbon nanodroplets (NDs) have diverse applications, but their stability in biological environments is crucial yet underexplored.
  • Current methods for creating stable, uniform NDs with low energy are limited, hindering their use in physiological conditions.
  • Potential toxicity from surface stabilizers restricts the application of NDs in advanced medical interventions.

Purpose of the Study:

  • Investigate the formation and stability of uncoated perfluorohexane (PFH) NDs.
  • Explore the influence of electrolyte composition and pH on NDs' characteristics.
  • Develop a method for creating stable NDs suitable for physiological settings without surface stabilizers.

Main Methods:

  • Synthesized uncoated perfluorohexane (PFH) nanodroplets (NDs) using a low-energy solvent exchange technique.
  • Studied ND formation and stability across various electrolyte compositions and pH levels.
  • Proposed a stabilization mechanism based on electrolyte-induced surface modifications.

Main Results:

  • Low concentrations of low-valent electrolyte ions promoted ND nucleation and accelerated Ostwald ripening.
  • High concentrations of highly valent electrolyte ions inhibited nucleation and slowed Ostwald ripening.
  • Electrolytes influence ND stability by altering ion adsorption, electric double layer thickness, and inter-droplet energy barriers.

Conclusions:

  • Electrolyte composition precisely controls the stability of perfluorocarbon nanodroplets.
  • A method for preparing stable, bare PFC NDs in physiological conditions is established.
  • Findings provide a theoretical basis for utilizing bare PFC NDs in biological and medical applications.