Coated Microcapsules with Metallic Barrier for Solvent Leakage
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Solution Overview
Problem
Current microcapsule technologies face challenges in efficiently encapsulating and controlling the release of volatile substances like perfume oils, particularly due to permeability issues with polar solvents such as ethanol, which cause premature leakage.
Innovation Solution
Development of coated microcapsules with a polymeric shell and a metallic coating comprising charge-stabilized nanoparticles, where a first metal is adsorbed onto the shell and a second metal forms a continuous film, creating a barrier that prevents solvent penetration while allowing controlled release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules are used to encapsulate perfume oils, then encapsulation of volatile substances is achieved, but polar solvents such as ethanol can penetrate the wall causing premature leakage
Solution Approach 1:
The invention uses a composite shell structure combining a polymeric shell with a metallic coating layer. The metallic coating comprises particles of a first metal (e.g., gold, silver, platinum) adsorbed on the polymeric shell with a film of a second metal (e.g., palladium, rhodium, iridium) formed thereon. This composite structure creates a barrier that prevents penetration by polar solvents like ethanol while maintaining encapsulation of the perfume oil core material.
2Loss of substance
If the microcapsule wall is made impermeable to prevent leakage, then retention of liquid core material is improved, but controlled release during use becomes difficult
Solution Approach 1:
The metallic coating provides a dynamic barrier that maintains impermeability under normal conditions but can be ruptured during use through mechanical action such as rubbing or friction. This allows the capsule to transition from a stable encapsulated state to a controlled release state when needed, enabling the perfume oil to be released in a controlled manner during normal human movement or application.
3Object-affected harmful factors
If a metallic coating is applied to prevent solvent penetration, then barrier performance is improved, but manufacturing complexity increases
Solution Approach 1:
The invention replaces complex multi-layer polymeric coatings with a metallic coating system that can be applied through chemical deposition processes. The metallic coating comprises particles of a first metal adsorbed on the polymeric shell with a film of a second metal formed thereon, creating an effective barrier against polar solvent penetration while simplifying the overall coating structure and manufacturing process.
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 coated microcapsules effectively prevent leakage from polar solvents and enable controlled release of the encapsulated substances, such as perfume oils, during use, maintaining a high retention of the liquid core material.
Implementation Method 1
particles of a first metal adsorbed on said polymeric shell
Implementation Method 2
particles of the first metal are charge-stabilised nanoparticles
Implementation Method 3
a film of a second metal formed thereon
Implementation Method 4
causing the perfume oils to leach prematurely from the microcapsules
Data Source
Figure 1a~2a
Figure 2b~2c
Figure 2d
AI summary
Accordingly, there are provided coated microcapsules including: a microcapsule including a polymeric shell and a liquid core material encapsulated therein; and a metallic coating surrounding said microcapsule, wherein the metallic coating comprises particles of a first metal adsorbed on said polymeric shell and a film of a second metal formed thereon; wherein said particles of the first metal are charge-stabilised nanoparticles; processes for preparing the coated microcapsules, as well as formulations related thereto are also included.