Colloidosome Microcapsule Production via Ionic Gelation
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Solution Overview
Problem
Current methods for producing colloidosomes-type microcapsules face challenges such as instability due to high vitreous transition temperatures of materials like PMMA, difficulty in scaling industrial production, and the use of organic solvents or heat treatments that affect the encapsulation efficiency and stability of the shell.
Innovation Solution
A process using ionic gelation to modify the surface chemistry of nano- or microparticles, which are then fixed on the oil-water interface through charged macromolecules and polyvalent ions, followed by heat treatment or cross-linking, to enhance emulsification efficiency and encapsulation concentration, allowing for the production of stable colloidosomes that can be dried into a powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PMMA particles are used to form colloidosomes, then the shell strength is improved, but the applicability to thermolabile systems deteriorates due to high vitreous transition temperature (92-142°C)
Solution Approach 1:
The patent changes the material parameter from PMMA to gelatin, which has a much lower gelation temperature (around 30-40°C), making it suitable for thermolabile systems while maintaining shell-forming capability
Solution Approach 2:
The patent uses composite gelatin-CaCO3 particles where gelatin provides low-temperature gelation for thermolabile system compatibility, and CaCO3 provides structural support for shell strength
2Manufacturing precision
If W/O/W double emulsion template is used with clay minerals, then colloidosome formation is achieved, but the process becomes difficult to scale at industrial level
Solution Approach 1:
The patent extracts and eliminates the complex W/O/W double emulsion template step, using direct adsorption of gelatin-CaCO3 particles onto oil-in-water emulsion droplets, thereby simplifying the process for industrial scaling while maintaining colloidosome formation control
Solution Approach 2:
The patent performs preliminary surface modification of CaCO3 particles with gelatin before the emulsion step, creating pre-functionalized particles that directly stabilize emulsion droplets and form colloidosomes in a single step, eliminating multi-step template procedures
3Adaptability or versatility
If organic solvents are used for emulsified oil phase extraction, then interface structure modulation is achieved, but the process becomes non-viable for industrial scaling due to long adsorption times
Solution Approach 1:
The patent replaces chemical extraction methods using organic solvents with a physical-chemical adsorption mechanism where gelatin-CaCO3 particles directly adsorb onto emulsion droplets, achieving interface structure modulation without requiring solvent extraction or prolonged adsorption times
Solution Approach 2:
The patent introduces gelatin as an intermediary substance that bridges the CaCO3 particles and the oil-water interface, enabling rapid adsorption and interface structure control without the need for organic solvents or extended processing times
4Manufacturing precision
If triglycerides are used as emulsion stabilizers, then colloidosome formation is achieved, but the shell destabilizes when triglycerides are melted
Solution Approach 1:
The patent creates composite gelatin-CaCO3 particles where the inorganic CaCO3 core provides thermal stability and structural integrity at elevated temperatures, while the gelatin shell enables colloidosome formation at lower temperatures, resolving the contradiction between formation and stability
Solution Approach 2:
The patent changes the emulsion stabilizer from triglycerides (which melt and destabilize shells) to gelatin-CaCO3 composite particles that maintain structural stability across a broader temperature range, preventing shell destabilization
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
This method increases the mechanical stability and efficiency of the emulsification process, enabling the production of colloidosomes with high encapsulation efficiency and stability, suitable for industrial scaling, while avoiding the limitations of previous methods.
Implementation Method 1
ionic gelation to modify the surface chemistry of nano- or microparticles
Implementation Method 2
fixed on the oil-water interface through charged macromolecules and polyvalent ions, followed by heat treatment or cross-linking
Implementation Method 3
The particles that stabilize the emulsion are fixed at the interface by polyelectrolyte adsorption
Implementation Method 4
fixed on the oil-water interface through charged macromolecules and polyvalent ions
Implementation Method 5
followed by heat treatment or cross-linking, to enhance emulsification efficiency
Implementation Method 6
allowing for the production of stable colloidosomes that can be dried into a powder
Data Source
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AI summary
This invention relates to a process for colloidosome-type microcapsules elaboration from solid particles microcapsules obtained by ionic gelation. In the process, an (O/W) type emulsion is initially generated stabilized with the solid particles microcapsules, and then the particles are fixed to the interface by adsorption of polyelectrolytes, cross-linking, heat treatment or fatty coating, generating the colloidosome with the water-insoluble phase encapsulated in the core and covered by the shell particles.