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Related Concept Videos

Colloids03:22

Colloids

21.0K
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 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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Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy03:07

Kinetic Molecular Theory: Molecular Velocities, Temperature, and Kinetic Energy

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The kinetic molecular theory qualitatively explains the behaviors described by the various gas laws. The postulates of this theory may be applied in a more quantitative fashion to derive these individual laws.
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Colloids and Suspensions01:17

Colloids and Suspensions

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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 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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Kinetic Energy00:23

Kinetic Energy

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Kinetic energy is the ability of an object in motion to do work or enact change. It can take on many forms. For instance, water flowing down a waterfall has kinetic energy. In biological systems, particles of light travel and are absorbed by plants to create chemical energy. Animals consume the chemical energy and give off molecules that carry their scent through the air. They also generate kinetic energy when they run away from predators. Entire systems also possess kinetic energy, like the...
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Colloidal precipitates01:09

Colloidal precipitates

6.5K
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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Enzyme Kinetics01:19

Enzyme Kinetics

104.0K
Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...
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Synthesis and Characterization of Supramolecular Colloids
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Aggregation kinetics and colloidal stability of functionalized nanoparticles.

Filippo Gambinossi1, Steven E Mylon2, James K Ferri1

  • 1Lafayette College, Department of Chemical and Biomolecular Engineering, Easton, PA 18042, USA.

Advances in Colloid and Interface Science
|August 25, 2014
PubMed
Summary
This summary is machine-generated.

Functionalized nanoparticles offer enhanced stability for nanomaterials, crucial for their diverse applications. Novel functionalization schemes enable controllable aggregation, maintaining nanoparticle function.

Keywords:
Aggregation kineticsColloidal stabilityCore–shell nanoparticlesDynamic light scatteringFunctional polymersNanoparticle functionalization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Nanoparticle functionalization is key to maintaining stability in suspensions, preventing aggregation and loss of function.
  • The growing applications of functionalized nanomaterials necessitate advanced control over their stability.
  • Current methods focus on capping agents for specific solution chemistries to ensure monodispersity.

Purpose of the Study:

  • To review novel functionalization schemes for nanoparticles designed to control aggregation.
  • To highlight synthesis and attachment methods for these advanced functionalization strategies.
  • To discuss methods for measuring aggregation kinetics and theoretical models for data reduction.

Main Methods:

  • Review of stimulus-responsive polymers (e.g., temperature, pH-sensitive) for nanoparticle functionalization.
  • Analysis of primary methods for measuring particle aggregation kinetics.
  • Discussion of theoretical models for nanoparticle aggregation data analysis.
  • Case study on gold nanoparticles functionalized with block copolymers.

Main Results:

  • Advanced functionalization allows fine control over nanoparticle suspension stability.
  • Stimulus-responsive polymers enable tunable transitions between monodisperse and aggregated states.
  • Homologous block copolymers demonstrate effective control over gold nanoparticle aggregation.

Conclusions:

  • Novel functionalization schemes are critical for precise control over nanoparticle aggregation and stability.
  • Understanding aggregation kinetics and applying appropriate models are essential for nanomaterial design.
  • Functionalized nanoparticles offer tailored properties for a wide array of applications.