Nanoparticle Suspension
Nanoparticle Suspension - Related Videos
09:33
Asymmetrical Flow Field-Flow Fractionation for Sizing of Gold Nanoparticles in Suspension
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Cited by 6 •
2020
This protocol describes the use of Asymmetrical Flow Field-Flow Fractionation coupled with UV-vis detection for the determination of the size of an unknown gold nanoparticle sample.
10:17
The Tail Suspension Test
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Cited by 534 •
2012
The tail-suspension test is validated as an experimental procedure to assess antidepressant efficacy of drug treatments in mice. Mice are suspended by their tails for six minutes and escape-related behaviors are assessed. We describe procedures used in conducting the tail suspension test.
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.
04:16
ECM Suspension Preparation: A Technique to Obtain Homogenous Suspension from Tissue-derived Extracellular Matrix
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2023
This video describes the preparation of a homogenized and digested extracellular matrix suspension from decellularized and lyophilized tissues. This technique helps in fabricating ECM-derived porous foams and microcarriers for use as substrates in advanced 3D cell culture models.
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
Stability reflects a competition between attractive forces, which bring particles together, and repulsive effects that keep surfaces separated. Electrostatic surface charge supplies one repulsive contribution, while adsorbed molecules can create steric barriers, meaning physical spacing that hinders contact. The resulting balance determines whether aggregation is limited or promoted.
Changes in pH, ionic strength, or solvent composition can shift the balance of interactions at nanoparticle surfaces. Under some conditions, these changes promote particle association, settling, or flocculation, in which dispersed particles form larger clusters. Controlling the surrounding liquid is therefore important when maintaining a consistent suspension for chemical processing or measurement.
Brownian motion, the continual irregular movement of particles within a liquid, can help counteract the tendency of dispersed nanoparticles to settle. Its contribution supports continued movement throughout the suspension, although it does not eliminate attractive forces or prevent every form of aggregation. Stability still depends on surface charge, steric barriers, and liquid composition.
Preparation should account for particle size, concentration, and stability because each variable can affect the behavior of the final suspension. The surrounding liquid also requires attention to pH, ionic strength, and solvent composition, which may alter aggregation or settling. Monitoring these factors helps produce a suspension suited to its intended chemical application.
Chemists can use controlled nanoparticle suspensions for catalyst preparation, solution-based materials processing, sensing, and formulation. These applications benefit from combining nanoscale surface properties with the ability to handle particles in a liquid. The appropriate suspension conditions depend on whether the priority is chemical reactivity, processability, detection, or formulation performance.
Particle size, concentration, and stability can strongly influence reactivity, optical behavior, and overall performance. Aggregation or settling may change how much nanoparticle surface remains available and can make the suspension less uniform. For this reason, controlling dispersion conditions is important when interpreting chemical responses, optical signals, or results from solution-based processing.