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Triplet Fusion Upconversion Nanocapsule Synthesis

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Published on: September 7, 2022

Preparation of polyurea capsules using electrocapillary emulsification.

Hideki Sakai¹, Keisuke Tanaka, Hiroshi Fukushima

¹Department of Pure and Applied Chemistry, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba, Japan.

Colloids and Surfaces. B, Biointerfaces

|September 5, 2008

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Researchers created submicron polyurea capsules using electrocapillary emulsification. Adjusting aqueous phase volume and dropping rate, along with monomer ratios, controls particle size for applications like bioreactors.

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Controlling particle size in the submicron range is crucial for advanced material applications.
Polyurea capsules offer potential for use in bioreactors and as carriers due to their versatile properties.

Purpose of the Study:

To synthesize polyurea capsules with controlled submicron particle sizes.
To investigate the influence of various experimental parameters on capsule formation and size.

Main Methods:

Electrocapillary emulsification technique employed for capsule preparation.
Interfacial polycondensation reaction between tetraethylenepentamine (TEP) and toluenediisocyanate (TDI).
Utilized sorbitan sesquioleate (SO-15) as an emulsion stabilizer in the oil phase.

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Main Results:

Capsule size was successfully reduced by decreasing the aqueous phase volume and the dropping rate.
The mole ratio of TEP to TDI significantly impacted the final capsule diameter.
Achieved polyurea capsules with an average diameter of approximately 200nm under optimized conditions.

Conclusions:

Electrocapillary emulsification is an effective method for producing submicron polyurea capsules.
Particle size control is achievable by manipulating key process parameters.
The synthesized 200nm polyurea capsules show promise for future applications in bioreactors and drug delivery systems.