Microfluidic Dispersion Formation with In-Line Raw Material Injection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing microfluidic methods for forming dispersions with macroscopic drops are sensitive to raw materials that are not compatible or only slightly compatible with the emulsification and flow steps, leading to issues such as channel blockage, pH activation of gelling agents, material degradation, and surface tension modification.
Innovation Solution
A method that involves injecting a solution containing raw materials that are not compatible with the microfluidic emulsification and flow steps directly into the flow line or at the outlet of the flow line, upstream of the container, allowing for the formation of stable dispersions with macroscopic drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If raw materials are included in the second phase before microfluidic emulsification, then the dispersion can be formulated with desired functional properties, but channel blockage occurs due to reflective particles or precipitate formation
Solution Approach 1:
The patent divides the formulation process into two separate stages: first forming the dispersion through microfluidic emulsification with a clear second phase, then adding raw materials (such as reflective particles or precipitate-forming substances) in a subsequent step. This segmentation prevents blockage during emulsification while maintaining formulation flexibility.
Solution Approach 2:
The patent performs the microfluidic emulsification step first to create the stable dispersion structure, then performs the addition of raw materials as a preliminary action before final formulation. This ensures that the emulsification process is not interfered with by potentially blocking materials.
2Stability of the object's composition
If raw materials increasing pH are added to the second phase before emulsification, then the gelling/suspending effect of carbomer is activated, but flow becomes impossible in microfluidic device lines
Solution Approach 1:
The patent separates the pH adjustment step from the emulsification step. The second phase is kept at acidic pH (3.5-5.5) during microfluidic processing to maintain flowability, and pH adjustment to activate the gelling/suspending effect is performed in a subsequent step after emulsification is complete.
Solution Approach 2:
The patent performs emulsification first while the second phase maintains low viscosity for good flow, then performs pH adjustment as a preliminary action to activate the gelling effect. This sequence ensures both flowability during processing and stability in the final product.
3Ease of operation
If raw materials compatible with acidic pH are used in the second phase, then emulsification can proceed, but certain raw materials deteriorate or modify surface tension hindering drop formation
Solution Approach 1:
The patent segments the process so that emulsification occurs first in a controlled acidic environment, then raw materials are added in a subsequent step. This ensures that drop formation is not hindered by surface tension modifications from incompatible raw materials.
Solution Approach 2:
The patent uses the acidic pH environment as an intermediary condition that allows emulsification to proceed reliably before introducing raw materials. The acidic pH acts as a protective condition during the critical emulsification step.
4Manufacturing precision
If traditional microfluidic methods are used with incompatible raw materials, then macroscopic drops can be formed, but product handling and processing become complex
Solution Approach 1:
The patent segments the formulation process into distinct steps: first performing the precise microfluidic emulsification to achieve controlled macroscopic drops, then adding incompatible raw materials in a separate step. This segmentation maintains manufacturing precision while simplifying the overall process by avoiding the need to handle incompatible materials during emulsification.
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 enables the production of stable, macroscopic drop dispersions with controlled size and satisfactory optical properties, even when using raw materials that are not compatible with traditional microfluidic methods, while minimizing product handling.
Implementation Method 1
formation of drops of a first phase in a second phase substantially immiscible with the first phase
Implementation Method 2
the gelling/suspending effect of the carbomers is activated by the 'neutralization' of the second phase by the addition of a viscosity-increasing solution increasing the pH
Implementation Method 3
The shell is formed by a very thin layer of coacervat, interposed between the first phase and the second phase to provide the stability of the drops
Data Source
AI summary
This method comprises the following steps: (i) formation of drops of a first phase in a second phase substantially immiscible with the first phase; (ii) flow, in a flow line, of the drops; (iii) recovery of a dispersion comprising drops and second phase in a container; and (iv) injection of a solution into the flow line or at the outlet of the flow line, upstream of the container, the solution comprising at least one raw material which is not or is not very compatible with step (i) and/or step (ii).