Nanoparticle Size Control
Nanoparticle Size Control - Related Videos
08:21
A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
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Cited by 4 •
2016
We describe a simple method for producing highly stable oligomeric clusters of gold nanoparticles via the reduction of chloroauric acid (HAuCl4) with sodium thiocyanate (NaSCN). The oligoclusters have a narrow size distribution and can be produced with a wide range of sizes and surface coats.
16:24
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Cited by 13 •
2012
The goal of this experiment is to determine and control the size, shape and stability of self-assembled discotic amphiphiles in water. For aqueous based supramolecular polymers such level of control is very difficult. We apply a strategy using both repulsive and attractive interactions. The experimental techniques applied to characterize this system are broadly applicable.
11:35
Constant Pressure-controlled Extrusion Method for the Preparation of Nano-sized Lipid Vesicles
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Cited by 29 •
2012
This protocol describes an extrusion method for preparing lipid vesicles of sub-micron sizes with a high degree of homogeneity. This method uses a pressure-controlled system with controlled nitrogen flow rates for liposome preparation. The lipid preparation1,2, liposome extrusion, and size characterization will be presented herein.
12:47
Tangential Flow Ultrafiltration: A “Green” Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Cited by 20 •
2012
Tangential flow ultrafiltration (TFU) is a recirculation method used for the weight-based separation of biosamples. TFU was adapted to size-select (1-20 nm diameter) and highly concentrate a large volume of polydisperse silver nanoparticles (4 L of 15.2 μg ml-1 down to 4 ml of 8,539.9 μg ml-1) with minimal aggregation.
01:16
Precipitate Formation and Particle Size Control
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2024
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...
FAQs
Size control depends on the relationship between nucleation and growth during synthesis. Nucleation creates new particle starting points, whereas growth enlarges particles that already exist. Adjusting the balance between these processes changes the resulting dimensions and size distribution. This mechanistic distinction helps chemists interpret why changes in synthesis conditions can alter particle uniformity and performance.
Precursor concentration, temperature, reaction time, reducing-agent strength, surfactants, and ligands are the principal adjustable inputs identified for nanoparticle size control. These variables alter the chemical environment in which nucleation and growth occur, while reaction time determines how long those processes continue. Considering them together is important because changing one condition can affect the balance that sets final dimensions.
Surfactants and ligands can limit aggregation and crystal growth, helping prevent particles from continuing to enlarge or cluster during synthesis. Their role differs from simply changing precursor concentration or temperature because they directly help restrict particle development. Including these additives can support a narrower size range and improve the reproducibility of the resulting material.
A practical workflow starts by selecting the desired particle dimensions and then deliberately tuning precursor concentration, temperature, reaction time, reducing-agent strength, and any surfactant or ligand. The resulting particles should be assessed for size range and consistency, because narrow distributions make experiments easier to compare. Repeating the synthesis with controlled changes helps identify conditions that produce the desired dimensions.
Particles within a narrow size range improve reproducibility and make comparisons across experiments more meaningful. Because dimensions influence surface area, reactivity, optical behavior, and stability, a broad distribution can combine materials with different properties. Controlling the range therefore helps researchers connect a measured outcome to a more consistent nanoscale structure rather than to uncontrolled variation in particle size.
Size-controlled nanoparticles can be tailored for catalysts, sensors, electronic materials, and drug-delivery systems. The relevant advantage depends on the property being targeted: dimensions affect surface area and reactivity in catalytic settings, while optical behavior and stability are also important across applications. Controlled synthesis gives researchers a way to design nanoscale materials around specific performance requirements.