Nanoparticle Aggregation
Nanoparticle Aggregation - Related Videos
07:08
In Situ Synthesis of Gold Nanoparticles without Aggregation in the Interlayer Space of Layered Titanate Transparent Films
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Cited by 1 •
2017
Here, we present a protocol for the in situ synthesis of gold nanoparticles (AuNPs) within the interlayer space of layered titanate films without the aggregation of AuNPs. No spectral change was observed even after 4 months. The synthesized material has expected applications in catalysis, photo-catalysis, and the development of cost-effective plasmonic devices.
09:23
Harmonic Nanoparticles for Regenerative Research
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Cited by 1 •
2014
Protocol details are provided for in vitro labeling human embryonic stem cells with second harmonic generating nanoparticles. Methodologies for hESC investigation by multi-photon microscopy and their differentiation into cardiac clusters are also presented.
10:10
Aggregates for Concrete and Asphaltic Mixes
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Concrete and asphalt are by far the most common construction materials used today. Concrete is a composite material consisting of cement, water, air, coarse aggregate, and fine aggregates. Fine aggregates are typically sands and coarse aggregates are natural or crushed rocks. Chemical admixtures to modify certain specific properties are also commonly used (i.e., superplasticizers to make the...
04:16
A Magnetic Nanoparticle-Based Immunoassay Using a Microfluidic Device
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2025
This video demonstrates a microfluidic system for a magnetic nanoparticle-based immunoassay. The detection system utilizes a microfluidic device incorporating a magnetic trap within its channels. Pre-formed immunocomplexes, comprised of antigen-coated magnetic nanoparticles bound to primary and peroxidase-conjugated secondary antibodies, are introduced into the channels. The immunocomplexes become captured in the porous magnetic trap upon applying an external magnetic field. Using a fluorogenic...
13:39
Optical Trapping of Nanoparticles
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Cited by 7 •
2013
The following setup approach details low power optical trapping of dielectric nanoparticles using a double-nanohole in metal film.
FAQs
The balance between attractive and repulsive forces determines whether particles remain dispersed. Van der Waals interactions promote clustering, whereas electrostatic repulsion can oppose close approach. Changes in pH, ionic strength, solvent composition, or surface coating can shift this balance, so the same nanoparticles may show different suspension stability under different chemical conditions.
Electrostatic stabilization relies on repulsive interactions associated with particle surfaces, while steric stabilization uses a surface coating to hinder close particle approach. Both mechanisms reduce the tendency to form clusters, but they act through different forms of surface-based protection. Distinguishing them helps chemists select coatings suited to maintaining dispersed colloids.
The key variables identified are pH, ionic strength, solvent composition, and surface coatings. A change in any one can shift the attractive-repulsive balance and alter suspension stability. Considering these factors helps connect chemical conditions with changes in particle clustering, surface reactivity, optical behavior, and overall material performance.
Control begins with selecting chemical conditions and surface treatments that shift the force balance toward dispersion. Researchers can compare changes in pH, ionic strength, solvent composition, or coating conditions while considering effects on suspension stability. This approach supports the preparation of colloids whose reactivity, optical behavior, or material performance better matches the intended application.
Aggregation can complicate interpretation of particle size, transport, and reactivity because clustering changes the assembly being studied. It can also modify optical behavior and material performance, making observed behavior differ from that expected for more dispersed particles. Recognizing aggregation as a chemical variable helps relate outcomes to suspension conditions and surface state.
In chemistry, controlling nanoparticle aggregation is relevant when designing stable colloids, catalysts, sensors, and functional nanomaterials. Stability may be central for a colloid, whereas altered surface reactivity, optical behavior, or material performance may matter in a functional system. This context links aggregation control to laboratory studies and industrial material systems.