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Precipitate Formation and Particle Size Control

Precipitate Formation and Particle Size Control

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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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

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Published on: January 25, 2018

Liquid-core polymer nanocapsules prepared using flash nanoprecipitation.

Sophia Taylor¹, Yuri Chung¹, Samuel Becker¹

¹Department of Physics and Institute for Soft Matter Synthesis and Metrology, Georgetown University, 37th & O Sts. NW, Washington DC, USA.

|February 26, 2024

Summary

Flash nanoprecipitation successfully created nanocapsules with polystyrene shells and liquid n-hexadecane cores. Particle size was tunable by adjusting concentrations of polystyrene and n-hexadecane.

Keywords:

Flash nanoprecipitation Nanocapsules Nanoparticle synthesis Nanoparticles Polymers

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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles

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Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles

Flash NanoPrecipitation for the Encapsulation of Hydrophobic and Hydrophilic Compounds in Polymeric Nanoparticles

Published on: January 7, 2019

Area of Science:

Materials Science
Nanotechnology
Polymer Chemistry

Background:

Nanocapsules, featuring solid shells and liquid cores, are versatile materials with diverse applications.
Flash nanoprecipitation is a key technique for synthesizing nanoparticles.

Purpose of the Study:

To synthesize nanocapsules using flash nanoprecipitation with a polystyrene shell and n-hexadecane liquid core.
To investigate the influence of polystyrene and n-hexadecane concentrations on nanocapsule formation and size.

Main Methods:

Synthesis of nanocapsules via flash nanoprecipitation.
Characterization of nanocapsule dispersions using dynamic light scattering and scanning electron microscopy.

Main Results:

Successfully created nanocapsules with radii from 50 to 200 nm.
Determined n-hexadecane core radii (35-175 nm) and polystyrene shell thicknesses (7-62 nm).
Confirmed core/shell morphology and established a droplet model for size dependence on precursor concentrations.

Conclusions:

Flash nanoprecipitation is an effective method for producing core-shell nanocapsules.
Nanocapsule size is controllable by varying initial concentrations of core and shell materials.
The findings provide insights into the formation mechanism of these nanostructures.