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Colloids03:22

Colloids

20.9K
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

6.0K
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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Colloids and Suspensions01:17

Colloids and Suspensions

3.3K
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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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

6.3K
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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Precipitation Titration: Endpoint Detection Methods01:19

Precipitation Titration: Endpoint Detection Methods

5.9K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
5.9K
Precipitation of Ions03:11

Precipitation of Ions

30.0K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
30.0K

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Colloidal Stabilizer-Assisted Polymerization-Induced Precipitation Method for Colloidally Stable Polyacid Particles.

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Researchers synthesized stable poly(acid phosphoxy ethyl methacrylate) (PAPEMA) latex particles using poly(N-vinylpyrrolidone) (PNVP). These PAPEMA particles effectively modify metal surfaces.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Poly(acid phosphoxy ethyl methacrylate) (PAPEMA) latex particles are useful for surface modification.
  • Controlling particle size and stability is crucial for effective application.

Purpose of the Study:

  • To synthesize near-monodispersed, colloidally stable PAPEMA latex particles.
  • To investigate the role of poly(N-vinylpyrrolidone) (PNVP) in latex formation.
  • To explore the creation of cross-linked PAPEMA particles with tunable properties.

Main Methods:

  • Free-radical dispersion polymerization using PNVP as a stabilizer and precipitating agent.
  • Dispersion copolymerization with a divinyl cross-linking comonomer.
  • Characterization using electron microscopy, dynamic light scattering, X-ray photoelectron spectroscopy, elemental microanalysis, and Fourier transform infrared spectroscopy.

Main Results:

  • Near-monodispersed, colloidally stable PAPEMA latex particles were successfully synthesized.
  • PNVP was found to be essential for latex formation, forming a complex with PAPEMA.
  • Cross-linked PAPEMA latex particles with controllable softness and pKa values were produced.
  • Characterization confirmed homogeneous distribution of PNVP within and on the particles.
  • PAPEMA latex particles demonstrated effectiveness as metal surface modifiers.

Conclusions:

  • PNVP plays a critical role in the successful synthesis of PAPEMA latex particles.
  • Tunable cross-linked PAPEMA latex particles can be synthesized for specific applications.
  • PAPEMA latex particles are effective for modifying metal surfaces.