Surfactant-Free Double Emulsion for Hydrophilic Encapsulation
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Solution Overview
Problem
Existing encapsulation methods require surfactants, leading to environmental issues and high energy costs, and have low encapsulation efficiency for hydrophilic active agents due to phase separation and osmotic pressure.
Innovation Solution
A one-step method for creating a surfactant-free water-in-oil-in-water double emulsion by adding an aqueous phase to an oil phase at controlled rates and stirring, resulting in stable emulsions with high encapsulation efficiency for hydrophilic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If surfactants are used to stabilize emulsions, then emulsion stability is improved, but environmental harm and contamination increase
Solution Approach 1:
The invention extracts and eliminates surfactants from the emulsion system entirely, replacing them with a natural stabilizing mechanism based on interfacial tension management through controlled phase inversion. The patent achieves stability without harmful substances by using a surfactant-free formulation where the emulsion transitions from W/O to O/W phase through controlled addition of continuous phase, eliminating environmental contamination while maintaining stability.
Solution Approach 2:
The invention changes the physical parameters of the emulsion system by controlling the phase inversion point through systematic addition of continuous phase. By monitoring and controlling the volume ratio of phases and the rate of addition, the system transitions from unstable W/O emulsion to stable O/W emulsion without requiring surfactants, thus resolving the contradiction between stability and environmental harm.
2Stability of the object's composition
If traditional two-step emulsion method is used, then emulsion formation is achieved, but process complexity and energy consumption increase
Solution Approach 1:
The invention merges the emulsion formation and stabilization steps into a single continuous phase inversion process. Instead of separately forming W/O emulsion and then stabilizing it, the patent combines both functions by continuously adding continuous phase to trigger phase inversion, thereby simplifying the process from two distinct steps to one integrated operation that reduces equipment complexity and energy consumption.
Solution Approach 2:
The invention implements continuous phase addition during the emulsion formation process, maintaining continuous useful action throughout. The systematic addition of continuous phase ensures uninterrupted phase inversion and emulsion stabilization in a single continuous operation, eliminating the need for separate batch processing steps and reducing overall process complexity.
3Stability of the object's composition
If aqueous phase is added to oil phase in traditional method, then emulsion is formed, but hydrophilic active agents are lost due to osmotic pressure
Solution Approach 1:
The invention inverts the traditional emulsion formation approach by triggering phase inversion from W/O to O/W instead of directly forming W/O emulsion. This inversion mechanism ensures that hydrophilic active agents remain trapped within the internal aqueous phase throughout the process, preventing their loss due to osmotic pressure while still achieving stable emulsion formation through the reversed phase transition pathway.
4Quantity of substance
If encapsulation efficiency is increased for hydrophilic agents, then more active agent is encapsulated, but process complexity increases
Solution Approach 1:
The invention performs preliminary action by pre-forming the internal aqueous phase containing hydrophilic active agents before the phase inversion occurs. This preliminary encapsulation of active agents within water-soluble carriers ensures high encapsulation efficiency is achieved during the phase inversion process itself, without requiring additional complex post-processing steps to enhance encapsulation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method achieves remarkably stable emulsions with at least 50% encapsulation of hydrophilic active agents, avoiding surfactant-related issues and reducing energy costs.
Implementation Method 1
the adhesion energy between two droplets of aqueous phase dispersed in the oil phase ranges from 10−5 J·m−2 to 10−3 J·m−2
Implementation Method 2
the addition dropwise of the aqueous phase to the oil phase being performed until a catastrophic inversion occurs
Implementation Method 3
The mixture comprising the aqueous phase and the oil phase is continuously stirred, preferably at a stirring speed ranging from 100 rpm to 3000 rpm
Data Source
AI summary
A method for the manufacture of a water-in-oil-in-water double emulsion, which includes a step of adding dropwise an aqueous phase to an oil phase until a catastrophic inversion. Also, a water-in-oil-in-water double emulsion, a method for preparing solid microcapsules from a water-in-oil-water double emulsion having oligomers and/or monomers in the oil phase.