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Updated: Jun 27, 2026

Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

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Published on: February 27, 2016

Microencapsulation and Stimuli-Responsive Controlled Release of Particles Using Water-in-Air Powders.

Krishna Panthi¹, Robin Singh¹, Kishore K Mohanty¹

¹Department of Petroleum and Geosystems Engineering, The University of Texas at Austin , Austin, Texas 78712, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 4, 2017

Summary

We developed a simple method to encapsulate hydrophilic particles (HP) in water-in-air powders using silica nanoparticles. These encapsulated HP can be released using specific stimuli, showing potential for petroleum engineering applications.

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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
Chemical Engineering

Background:

Encapsulation of hydrophilic particles (HP) is crucial for controlled delivery in various applications.
Existing methods may lack efficiency or stimuli-responsive release capabilities.

Purpose of the Study:

To develop a facile, one-step method for encapsulating micro- or nanosize HP.
To create a stimuli-responsive system for controlled release of encapsulated HP.
To explore the potential of this technology in subsurface petroleum engineering.

Main Methods:

A one-step water-in-air powder formation method was employed.
Hydrophobic silica nanoparticles were self-assembled around aqueous droplets containing HP under high shear.
Stimuli-responsive release was investigated using pH and surfactant solutions.
Contact angle studies were used to analyze surface hydrophobicity changes.

Main Results:

Successful encapsulation of HP within a silica shell was achieved.
Stimuli-responsive release of HP was demonstrated by altering the silica shell's wettability.
Contact angle measurements confirmed the effect of stimuli on surface hydrophobicity.

Conclusions:

A novel, facile method for encapsulating HP in water-in-air powders was established.
The developed system offers stimuli-responsive controlled release of encapsulated materials.
This technology holds significant promise for applications in subsurface petroleum engineering, including conformance control and acid stimulation.