Double-Layered Microcapsule Structure for Core Material Elution
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Solution Overview
Problem
Existing methods for preparing microcapsules with a double-layered structure of an inorganic inner layer and a polymer outer layer face challenges such as structural deformation during core material elution and substitution, making it difficult to selectively regulate the encapsulation and release of materials.
Innovation Solution
A method involving the dispersion of inorganic precursors in water with an emulsifier, followed by interfacial polymerization and hydrolysis under basic conditions to form a double-layered microcapsule, where the inorganic inner layer acts as a scaffold to maintain the capsule structure during elution and re-encapsulation, allowing for selective core material substitution without structural deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layered polymer microcapsule is formed, then the capsule can be prepared by a simple process, but the core material elution causes structural deformation of the capsule
Solution Approach 1:
The capsule structure is segmented into two functional layers: an inorganic inner layer that maintains structural integrity during core material elution, and a polymer outer layer that enables controlled elution. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between simple preparation and shape maintenance.
Solution Approach 2:
The invention uses a composite structure combining inorganic material (silica or glass) for structural support and polymer material for elution control. This composite approach allows the capsule to maintain its spherical shape during core material removal while still enabling controlled elution through the polymer layer.
2Shape
If a thick outer shell is formed to prevent structural modification, then the capsule shape is maintained, but core material elution becomes insufficient
Solution Approach 1:
The capsule wall is segmented into two layers with distinct functions: the inorganic inner layer provides structural support and shape maintenance, while the polymer outer layer is designed to be permeable or degradable for efficient core material elution. This segmentation resolves the contradiction by assigning different functions to different layers.
Solution Approach 2:
Different regions of the capsule wall have different properties: the inorganic inner layer has high structural strength and shape retention, while the polymer outer layer has controlled permeability or degradability for material transport. This local differentiation of properties allows simultaneous shape maintenance and efficient elution.
3Reliability
If a double-layered structure with inorganic inner layer and polymer outer layer is formed, then structural integrity during elution is improved, but the preparation process becomes complicated
Solution Approach 1:
The inorganic precursor is incorporated into the capsule structure during the initial polymerization process, before the capsule is fully formed. This preliminary incorporation simplifies the overall process by avoiding separate steps for inorganic layer formation and core material removal that would otherwise be required.
Solution Approach 2:
The formation of the inorganic inner layer and the polymer outer layer are merged into a single integrated process where the inorganic precursor is present during polymerization and is converted to the inorganic layer in situ. This merging of steps reduces process complexity while maintaining the benefits of the double-layered structure.
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
This method efficiently produces microcapsules with a double-layered structure that can elute and re-encapsulate core materials without structural modification, enabling their use in drug storage and delivery systems by facilitating the introduction and encapsulation of compounds.
Implementation Method 1
hydrolyzing the inorganic precursors inside polymer shell under basic condition
Implementation Method 2
dispersing oil droplets containing inorganic precursor selected from carboxylate salts and alkoxide compounds in water with emulsifier
Implementation Method 3
performing an interfacial polymerization of amine-aldehyde prepolymer dissolved in water phase on the surface of the droplets
Data Source
AI summary
The present invention relates to a method of preparing a microcapsule with a double-layered structure which comprises the steps of performing an interfacial polymerization of an amine-aldehyde prepolymer on droplets containing an inorganic metal precursor selected from carboxylate and alkoxide compounds, and hydrolyzing the including inorganic precursors for formation of inorganic inner layer. The method of the present invention can prepare a microcapsule with a double-layered structure of an inorganic inner layer and a polymer outer layer, which is effective for eluting and substituting a core material inside the capsule.