Coated Microcapsules with Metallic Barrier for Solvent Resistance
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Solution Overview
Problem
Current microcapsules for encapsulating volatile substances like perfume oils are impermeable to polar solvents, but they fail to provide controlled release, as solvents like ethanol can penetrate the microcapsule walls, causing premature leakage of the encapsulated oils.
Innovation Solution
A coated microcapsule design featuring a polymeric shell with a metallic coating, where particles of a first metal are adsorbed onto the shell and a film of a second metal is formed on these particles, creating a robust barrier that prevents solvent penetration while allowing controlled release through mechanical rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules are made impermeable to polar solvents to prevent premature leakage, then the stability of the encapsulated liquid core material is improved, but the controlled release capability during use is compromised
Solution Approach 1:
The patent applies composite materials by combining a polymeric shell with a metallic coating layer. The polymeric shell provides impermeability to polar solvents, while the metallic coating enables controlled release through mechanical rupture. This composite structure resolves the contradiction by integrating the protective function of the polymeric shell with the controlled release function of the metallic coating.
Solution Approach 2:
The patent changes the physical and chemical parameters of the microcapsule wall by adding a metallic coating. This coating modifies the mechanical properties to enable controlled rupture while maintaining the impermeability of the polymeric shell. The metallic coating alters the stress distribution and rupture characteristics, allowing controlled release without compromising the barrier properties.
2Ease of operation
If a metallic coating is applied to provide controlled release through mechanical rupture, then the controlled release capability is improved, but the complexity of the microcapsule structure increases
Solution Approach 1:
The patent uses a thin metallic coating layer applied over the polymeric shell. This thin film approach provides the controlled release function through mechanical rupture while minimizing the increase in structural complexity. The metallic coating is applied as a thin layer, maintaining the overall simplicity of the microcapsule structure while enabling the desired controlled release mechanism.
Solution Approach 2:
The composite structure of polymeric shell with metallic coating is designed to achieve controlled release with minimal added complexity. The metallic coating is integrated directly onto the polymeric shell, creating a unified structure that functions as a single unit. This approach avoids the need for separate complex release mechanisms and maintains structural simplicity.
3Reliability
If the polymeric shell is made robust to prevent solvent penetration, then the stability is improved, but the ability to rupture during normal use is reduced
Solution Approach 1:
The composite structure combines the robust polymeric shell that resists solvent penetration with a metallic coating that facilitates controlled rupture. The polymeric shell maintains its integrity against solvents, while the metallic coating provides the necessary mechanical properties for controlled rupture during normal use. This composite approach resolves the contradiction between robustness and rupturability.
Solution Approach 2:
The metallic coating changes the mechanical parameters of the microcapsule wall, enabling controlled rupture while the polymeric shell maintains its solvent resistance. The coating alters the stress distribution and rupture characteristics, allowing the shell to be both robust against solvents and capable of controlled rupture under mechanical stress.
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 retain the liquid core material, especially in the presence of ethanol, and release it in a controlled manner upon mechanical stress, enhancing the stability and longevity of fragrance formulations.
Implementation Method 1
contacting the polymeric shell with a reducing agent and a solution comprising ions of the first metal, thereby reducing said ions and forming particles of the first metal adsorbed on said polymeric shell
Implementation Method 2
forming particles of the first metal adsorbed on said polymeric shell
Implementation Method 3
a metallic coating surrounding said microcapsule... creating a robust barrier that prevents solvent penetration
Implementation Method 4
release it in a controlled manner upon mechanical stress
Data Source
Figure 1a~2a
Figure 2b~2c
Figure 3
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 includes particles of a first metal adsorbed on said polymeric shell and a film of a second metal formed thereon; wherein the particles of the first metal are adsorbed on said polymeric shell by contacting the polymeric shell with a reducing agent and a solution comprising ions of the first metal, thereby reducing said ions and forming particles of the first metal adsorbed on said polymeric shell; method and formulations related thereto are also provided.