Microcapsule Millisecond Release via Elastomer Shell Rupture
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Solution Overview
Problem
Existing microcapsules release active ingredients slowly due to slow diffusion, taking seconds or minutes, which limits their effectiveness in pharmaceuticals and cosmetics and fails to provide a unique sensual experience in food.
Innovation Solution
A microcapsule with a core phase containing polyvinyl alcohol, a density enhancer, and an active substance, surrounded by a shell phase of elastomer precursor, curing agent, and silicone oil, which ruptures under mechanical stress to release the active substance in milliseconds, providing strong mechanical stimulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If microcapsules use conventional membrane materials and structures, then they maintain mechanical stability and store active substances, but they release active ingredients slowly through diffusion taking seconds or minutes
Solution Approach 1:
The patent changes the material parameters of the shell phase by using elastomer precursors (such as polydimethylsiloxane) instead of conventional rigid membrane materials. This parameter change transforms the shell from a stable but slow-release structure to an elastic structure that can rapidly deform and rupture, achieving millisecond-level release speeds while maintaining mechanical stability through controlled elasticity before rupture.
Solution Approach 2:
The patent employs composite material design by combining elastomer precursors with crosslinking agents and catalysts in the shell phase. This composite structure provides both the mechanical stability needed for storage and the rapid rupture capability for fast release. The crosslinked elastomer network maintains structural integrity until a critical stress threshold is reached, at which point rapid failure occurs enabling ultrafast release.
2Productivity
If microcapsules release active ingredients rapidly, then they provide strong mechanical stimulation and improve absorption efficiency, but they lose mechanical stability and may leak before use
Solution Approach 1:
The patent applies dynamics principle by designing the shell phase with time-dependent mechanical properties. The elastomer-based shell maintains stability during storage and transport, then transitions to a rapid rupture state upon application of mechanical stress (such as skin friction or chewing). This dynamic behavior allows the microcapsules to switch between stable storage mode and rapid release mode, achieving both reliability and productivity.
Solution Approach 2:
The patent uses flexible elastomer shells instead of rigid membranes. The flexible shell can deform under stress and then rapidly return to its original state or rupture, providing both mechanical stability during storage and rapid release capability. The elasticity of the shell allows it to withstand handling and storage conditions while enabling ultrafast release when triggered by external stress.
3Speed
If microcapsules use rigid membrane structures, then they maintain structural integrity, but they fail to provide mechanical stimulation and ultrafast release
Solution Approach 1:
The patent changes the mechanical parameters of the shell phase by selecting elastomer materials with specific elastic moduli and rupture strengths. These parameter changes enable the shell to store elastic energy during deformation and then release it rapidly through rupture, generating both ultrafast release and strong mechanical stimulation. The elastic properties of the material are key to achieving millisecond-level release with high force output.
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 microcapsules achieve rapid release of active ingredients in milliseconds, enhancing absorption efficiency and providing a unique sensual experience, while maintaining mechanical stability and preventing leakage.
Implementation Method 1
the core phase includes 8 wt % to 12 wt % of polyvinyl alcohol (PVA), 4 wt % to 6 wt % of a density enhancer
Implementation Method 2
the shell phase includes an elastomer precursor, a curing agent and silicone oil
Data Source
AI summary
A microcapsule and a preparation method and use thereof are provided. The microcapsule includes a core phase and a shell phase with a volume ratio of (3.4-3.8):(0.8-1.2); wherein the core phase includes 8 wt % to 12 wt % of PVA, 4 wt % to 6 wt % of a density enhancer, 0.1 wt % to 0.3 wt % of an active substance, and a residual amount of water; the shell phase includes an elastomer precursor, a curing agent and silicone oil with a mass ratio of (9-11):(0.8-1.2):(2.5-3). The microcapsules of the present invention release active ingredients completely in milliseconds, and the release process exerts a relatively strong mechanical stimulation intensity on the surrounding environment which can further improve an absorption efficiency to the active ingredients in the fields of pharmaceuticals and cosmetics, and can provide a unique sensual experience in the field of food.