Self-Inflating Silsesquioxane Microcapsules via Osmotic Pressure
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Solution Overview
Problem
Conventional methods for preparing microcapsules are slow and cumbersome, often requiring a template that adds complexity to the synthetic process.
Innovation Solution
A method involving an aqueous solution with an alkaline pH and silsesquioxane compounds, where the oil forms droplets that self-inflate due to osmotic pressure, allowing for rapid polymerization and encapsulation of aqueous solutions, solids, or gases within microcapsules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If templating is used for manufacturing microcapsules via interfacial polymerization and layer by layer self-assembly, then microcapsules with controlled structure can be produced, but the manufacturing process becomes complex and slow
Solution Approach 1:
The invention removes the template component from the microcapsule manufacturing process. Instead of using a sacrificial template that requires deposition and subsequent removal, the method directly forms microcapsules through interfacial polymerization of silsesquioxane compounds at oil-water interfaces, eliminating the complex template-based steps while maintaining structural control
Solution Approach 2:
The microcapsules form through self-assembly at the oil-water interface during emulsification. The silsesquioxane compounds automatically organize into capsule structures through interfacial polymerization driven by the phase boundary, without requiring external template guidance or complex multi-step assembly processes
2Manufacturing precision
If templating with interfacial polymerization is used to manufacture microcapsules, then load-carrying microcapsules can be produced, but the manufacturing speed is slow
Solution Approach 1:
The payload is pre-mixed with the oil phase before emulsification, so that during the rapid emulsification and interfacial polymerization process, the payload is automatically incorporated into the forming microcapsules. This eliminates the need for slow sequential steps of template formation, payload loading, and template removal
Solution Approach 2:
The method enables continuous manufacturing by performing emulsification and interfacial polymerization in a single integrated step. The microcapsules form continuously as the emulsion is created, with payload encapsulation occurring simultaneously, rather than through discrete sequential operations
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
Enables rapid loading and fabrication of microcapsules with controlled release capabilities, suitable for various applications including drug delivery, ultrasound imaging, and controlled release of biocides, with improved efficiency and versatility.
Implementation Method 1
Adding the oil to the aqueous solution generates an internal osmotic pressure inside the oil droplets by means of a chemical reaction. The aqueous solution is allowed to osmotically diffuse into the plurality of oil droplets
Implementation Method 2
The oil droplets are polymerized by cross-linking at least one silsesquioxane oligomer included in the oil to form a plurality of solidified microcapsules
Implementation Method 3
The oil includes at least one silsesquioxane compound. The oil is allowed to undergo a hydrolysis-and-condensation reaction such that a plurality of silsesquioxane oil droplets form
Data Source
AI summary
A method comprises providing an aqueous solution having an alkaline pH and providing an oil including at least one silsesquioxane compound. The oil is added to the aqueous solution. The oil forms a plurality of silsesquioxane oil droplets suspended in the aqueous solution such that an internal osmotic pressure is generated inside the oil droplets via a chemical reaction. The aqueous solution is allowed to osmotically diffuse into the plurality of oil droplets for a predetermined time. The silsesquioxane oil droplets are polymerized by cross-linking the at least one silsesquioxane compound included in the silsesquioxane oil droplets to form a plurality of solidified microcapsules containing the aqueous solution therewithin.