Discrete Gel Particles in Microfluidic Droplets
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Solution Overview
Problem
Current methods for forming gels within microfluidic droplets often result in the entire droplet gelling, rather than forming discrete gel particles, especially when the fluids are immiscible, limiting control over gel formation and distribution.
Innovation Solution
Introducing a fluid containing a gel precursor at high concentrations into microfluidic droplets, where the gel precursor solidifies due to increased viscosity and surface tension, preventing mixing and allowing for the formation of discrete gel particles within the droplets, even if the fluids are immiscible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gel precursor is introduced into microfluidic droplets at conventional concentrations, then the entire droplet gells, but discrete gel particles cannot be formed
Solution Approach 1:
The patent applies parameter changes by introducing gel precursor at high concentrations (≥0.5 vol%) into microfluidic droplets. This concentration parameter change causes the gel precursor to solidify and form discrete gel particles rather than gelling the entire droplet, thereby achieving precise control over gel formation and enabling monodisperse gel particle production.
2Manufacturing precision
If fluids are made immiscible to prevent mixing, then discrete gel particles can form, but control over gel distribution is limited
Solution Approach 1:
The patent applies local quality by creating conditions where gel precursor solidifies locally within droplets rather than uniformly throughout. By controlling the local concentration (≥0.5 vol%) and physical conditions (temperature, pH), discrete gel particles are formed at specific locations within the droplet, enabling precise spatial control over gel distribution while maintaining immiscibility of the bulk fluids.
3Manufacturing precision
If gel precursor concentration is increased to prevent mixing, then discrete particles form, but viscosity increases
Solution Approach 1:
The patent applies phase transitions by utilizing the solidification of gel precursor at high concentrations (≥0.5 vol%). This phase transition from liquid gel precursor to solid gel particles occurs within the droplet, allowing discrete gel particle formation. The phase transition enables the system to maintain high gel precursor concentrations without causing complete solidification of the entire droplet, thereby managing viscosity while achieving particle formation.
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 the creation of monodisperse sub-hydrocolloid gel particles within microfluidic droplets, allowing for controlled gel formation and distribution, with agarose concentrations above 0.7% ensuring gel particle formation and below 0.7% preventing it.
Implementation Method 1
the gel precursor solidifies due to increased viscosity and surface tension
Implementation Method 2
the gel precursor solidifies due to increased viscosity and surface tension
Implementation Method 3
Hydrocolloid gel networks are formed through entwining and cross-linking of polymer chains to generate three-dimensional network
Data Source
AI summary
The present invention generally relates to microfluidic droplets and, including forming gels within microfluidic droplets. In some aspects, a fluid containing agarose or other gel precursors is transported into a microfluidic droplet, and caused to harden within the droplet, e.g., to form a gel particle contained within the microfluidic droplet. Surprisingly, a discrete gel particle may be formed even if the fluid containing the agarose or other gel precursor, and the fluid contained within the microfluidic droplet, are substantially immiscible. Other aspects of the present invention are generally directed to techniques for making or using such gels within microfluidic droplets, kits containing such gels within microfluidic droplets, or the like.