Gel Microsphere Formation via Double Emulsion Segmentation
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Solution Overview
Problem
Conventional methods for producing double emulsions often result in droplets of varying sizes with multiple inner droplets, making it difficult to control the permeability and mechanical stability of capsules used in applications like pharmaceuticals, cosmetics, and food, due to the lack of precise control over the dimensions and composition of the capsule shell.
Innovation Solution
A method involving the formation of gel microspheres by creating double emulsion droplets where the inner fluid forms a gel and the outer fluid is solidified and then removed, using techniques such as ultraviolet light, temperature changes, or chemical reactions, to produce uniform gel particles within a carrier fluid.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical stirring or membrane emulsification is used to produce double emulsions, then the production process can be implemented, but the droplet size varies and multiple inner droplets are formed, resulting in poor control over capsule dimensions and composition
Solution Approach 1:
The invention segments the emulsification process into distinct stages using a multi-phase flow system where an inner phase containing polymer is surrounded by a middle phase, which is in turn surrounded by an outer phase. This segmentation allows precise control over droplet formation, ensuring uniform size and single inner droplet structure, thereby resolving the contradiction between manufacturing precision and reliability.
Solution Approach 2:
The middle phase acts as an intermediary between the inner and outer phases, enabling controlled emulsification. This intermediary phase facilitates the formation of uniform double emulsions with consistent dimensions and prevents the formation of multiple inner droplets, thus improving both manufacturing precision and reliability simultaneously.
2Reliability
If conventional emulsification methods are used, then capsule production is possible, but permeability and mechanical stability cannot be effectively controlled
Solution Approach 1:
The invention applies local quality by allowing different phases to have distinct compositions and properties. The inner phase contains polymer for gel formation, the middle phase controls emulsification, and the outer phase provides structural stability. This localized differentiation enables precise control over shell composition and thickness, thereby achieving both manufacturing precision and reliability in permeability and mechanical stability.
Solution Approach 2:
The invention utilizes parameter changes by controlling the physical and chemical properties of each phase (viscosity, interfacial tension, composition) to achieve desired emulsion characteristics. By adjusting these parameters, the process achieves precise control over capsule shell properties, resolving the contradiction between manufacturing precision and reliability.
3Ease of manufacture
If double emulsions are produced by conventional methods, then capsules can be formed, but good control over permeability and mechanical stability is difficult to achieve
Solution Approach 1:
The invention implements continuous emulsification through a streamlined multi-phase flow system that continuously produces uniform double emulsions. This continuous process maintains consistent droplet formation and shell properties throughout production, achieving both ease of manufacture and high manufacturing precision simultaneously.
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 approach allows for the precise control of gel particle formation within an aqueous carrier, enabling the production of monodisperse gel microspheres with controlled dimensions and properties, enhancing the stability and permeability of capsules for various applications.
Implementation Method 1
causing the polymer in the first fluid to form a gel
Implementation Method 2
using techniques such as ultraviolet light, temperature changes, or chemical reactions
Data Source
AI summary
The present invention generally relates to microfluidic droplets and, in particular, to multiple emulsion microfluidic droplets. In certain aspects, particles such as gel particles can be prepared in an aqueous carrier from aqueous droplets (or a non-aqueous carrier from non-aqueous droplets). For example, in some embodiments, double-emulsion droplets of a first fluid, surrounded by a second fluid, contained in a carrier fluid may be prepared, where the first fluid forms a gel and the second fluid is removed. For instance, the second fluid may be dissolved in the carrier fluid, or the second fluid may be hardened, then removed, for example, due to a change in pH. Other embodiments of the present invention are generally directed to kits containing such microfluidic droplets, microfluidic devices for making such microfluidic droplets, or the like.