Metal Oxide Shell Capsules for Low-Permeability Controlled Release
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Solution Overview
Problem
Current microencapsulation technologies face challenges in achieving long-term retention and controlled release of small molecules in harsh environments, with limited options that are safe for both human health and the environment, and fail to provide the right balance of low shell permeability, mechanical properties, and rupture profile.
Innovation Solution
Development of capsules with a metal oxide or semi-metal oxide shell comprising a first shell component and a second shell component, carefully selected to achieve reduced permeability and increased mechanical integrity, using precursors like silicon, titanium, and aluminum, with a condensed layer and nanoparticle layer, and a specific core-shell ratio for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If silane monomers with fast reaction time are used, then capsule formation speed increases, but shell permeability increases and mechanical integrity decreases
Solution Approach 1:
The patent uses composite materials by combining silane monomers with prepolymers having specific molecular weights and degrees of branching. The prepolymer component provides slower reaction kinetics and better control over shell formation, while the silane monomers contribute to shell density. This composite approach allows achieving low shell permeability and good mechanical integrity without sacrificing excessive capsule formation speed.
2Reliability
If shell thickness is increased to reduce permeability, then shell permeability decreases, but mechanical integrity and rupture profile deteriorate
Solution Approach 1:
The patent optimizes shell thickness within a specific range (170-1000 nm) and controls the core-shell volume ratio (80:20 to 98:2). By precisely controlling these parameters and using prepolymers with specific molecular weights and branching degrees, the invention achieves low shell permeability while maintaining adequate mechanical integrity and controlled rupture profile.
3Strength
If polymeric capsules are used to achieve mechanical properties, then mechanical integrity improves, but environmental safety and sustainability worsen
Solution Approach 1:
The patent uses inorganic materials (metal oxides and semi-metal oxides) with controlled organic content (up to 5 wt%) to create biodegradable capsules. By optimizing the composition parameters and using natural polymers or bio-based materials as the organic component, the invention achieves adequate mechanical properties while improving environmental safety and sustainability compared to traditional polymeric capsules.
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 capsules demonstrate improved mechanical integrity and low shell permeability, allowing for controlled release of benefit agents while maintaining stability in surfactant-based matrices, enhancing storage stability and targeted fracture strength.
Implementation Method 1
the shell comprises a first shell component comprising a condensed layer formed from a condensation product of a precursor
Implementation Method 2
a condensed layer formed from a condensation product of a precursor
Data Source
AI summary
A population of capsules, the capsules can include a core including a benefit agent and a shell surrounding the core, wherein the shell can include a first shell component.