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Related Concept Videos

Colloids03:22

Colloids

17.8K
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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Colloidal precipitates01:09

Colloidal precipitates

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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...
724
Colloids and Suspensions01:17

Colloids and Suspensions

2.0K
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 visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Surface Tension of Fluid01:22

Surface Tension of Fluid

439
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
439
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

910
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...
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Synthesis and Characterization of Supramolecular Colloids
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Synthesis and Characterization of Supramolecular Colloids

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Dynamically shaping the surface of silica colloids.

Vincent Niggel1, Chiao-Peng Hsu1, Lucio Isa1

  • 1Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zurich, CH-8093, Zurich, Switzerland. lucio.isa@mat.ethz.ch.

Soft Matter
|October 4, 2022
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Summary

Researchers developed a simple, one-pot method to create silica particles with controlled rough surfaces using two silanes. This facile synthesis route offers better control over particle morphology for advanced material processing.

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Area of Science:

  • Materials Science
  • Colloid Chemistry
  • Surface Science

Background:

  • Surface roughness is critical for particle-based material processing.
  • Existing methods for synthesizing rough particles have limitations like low yield and complexity.

Purpose of the Study:

  • To investigate a facile, one-pot synthesis route for silica particles with controlled corrugated surfaces.
  • To understand the mechanism behind surface structuring and control particle morphology.

Main Methods:

  • One-pot synthesis using tetraethyl orthosilicate (TEOS) and vinyltrimethoxysilane (VTMS).
  • Control of particle morphology via precursor ratios, ammonia concentration, and solvent exchange.
  • Characterization using atomic force microscopy (AFM) and in situ observation.

Main Results:

  • Silica particle morphology is tunable by adjusting silane precursors and ammonia concentration.
  • A mechanism involving silane droplet formation, preferential VTMS reaction, and osmotic imbalance leading to wrinkling/buckling is proposed.
  • Solvent exchange significantly impacts particle shape, demonstrating a dynamic synthesis route.

Conclusions:

  • A facile and controllable method for synthesizing corrugated silica particles is established.
  • The findings reveal a general mechanism for wrinkling and buckling applicable to various colloidal systems.
  • The synthesis allows for fluorescent dye incorporation for studying dynamic processes.