Metal Oxide Capsule Shells for Low-Permeability Active-Agent Retention
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Solution Overview
Problem
Current microencapsulation technologies face challenges in achieving complete retention of encapsulated active agents throughout the supply chain, while also ensuring safety for both the environment and human health, particularly for encapsulation of small molecules.
Innovation Solution
The development of metal oxide or semi-metal oxide based capsules with a selective choice of primary and secondary shell components, nanoparticles, core-shell ratio, and shell thickness, which provides reduced permeability and increased mechanical integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If silane monomers with fast hydrolysis kinetics are used, then shell formation speed is improved, but shell permeability increases and mechanical integrity deteriorates
Solution Approach 1:
The patent uses a composite shell structure combining silane monomer-derived matrix with metal oxide or semi-metal oxide nanoparticles (such as silica, titania, alumina). This composite approach allows the organic silane matrix to provide fast shell formation through rapid hydrolysis, while the inorganic nanoparticle reinforcement layer provides the dense network structure needed for low permeability and high mechanical integrity.
2Ease of manufacture
If cationic surfactants are used to drive hydrolyzed intermediates to interface, then deposition is improved, but environmental safety deteriorates
Solution Approach 1:
The patent removes cationic surfactants from the encapsulation system entirely. Instead, it relies on the intrinsic interfacial activity of metal oxide or semi-metal oxide nanoparticles and hydrolyzed silane species to achieve spontaneous deposition at the oil/water interface, eliminating the need for toxic surfactant additives.
Solution Approach 2:
The patent uses metal oxide or semi-metal oxide nanoparticles as intermediary substances that facilitate the formation of dense shell networks at the interface. These nanoparticles act as building blocks that self-assemble into permeability-reducing structures without requiring cationic surfactants, thereby maintaining environmental safety.
3Reliability
If polymeric capsules are used to achieve low permeability, then shell permeability is improved, but environmental safety deteriorates
Solution Approach 1:
The patent changes the fundamental material parameter from organic polymeric shells to inorganic metal oxide or semi-metal oxide based shells. This material substitution maintains low permeability performance through dense nanoparticle packing while eliminating the environmental persistence and toxicity issues associated with synthetic polymers.
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
These capsules maintain mechanical integrity when air-drying and exhibit low shell permeability in surfactant-based matrices, addressing the need for environmentally safe and effective encapsulation of benefit agents.
Implementation Method 1
the first shell component can include a condensed layer and a nanoparticle layer
Implementation Method 2
The core material is then mechanically separated from the surrounding environment
Implementation Method 3
they are not able to form shells with a dense non-porous network that would provide low shell permeability
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.