Microchannel Slug Segmentation Using Air and Oil Partitions
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Solution Overview
Problem
Conventional microfluidics technologies face challenges in storing, transporting, and delivering discrete fluid aliquots without risking evaporation or undesired mixing, are not fluid agnostic, require complex and bulky flow control mechanisms, and are not robust against physical disturbances like jarring or vibration, leading to slug fragmentation and mixing.
Innovation Solution
A microchannel system using discrete slugs separated by liquid, gas, or solidifiable oil partitions that act as separators, eliminating the need for fluid-specific adaptations and mechanical or fluidic valves, and incorporating air gaps and solidifiable oils to maintain separation and prevent mixing, with controlled recombination on demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional microfluidics valves are used to control fluid flow, then fluid aliquots can be created and delivered, but the system becomes complex and bulky, and the valves are not fluid agnostic requiring specific design for each reagent
Solution Approach 1:
The patent removes mechanical valves from the system entirely, extracting the problematic component that caused complexity. Instead of using valves to control fluid flow, the invention uses passive microfluidic channel design with hydrophobic surfaces and air slugs to achieve fluid separation and delivery, eliminating the need for complex valve mechanisms.
Solution Approach 2:
The patent replaces the mechanical valve system with a fluid-dynamic approach using air slugs and hydrophobic channel surfaces. The control mechanism shifts from mechanical actuation to fluid-based separation, where air slugs physically separate aqueous reagent slugs and hydrophobic surfaces passively direct flow without mechanical components.
2Stability of the object's composition
If air slugs are used as separators between fluid aliquots, then mixing between slugs is prevented, but the system becomes vulnerable to physical jarring or vibration causing slug fragmentation
Solution Approach 1:
The patent changes the physical state parameter of the separator from gas (air slug) to liquid (hydrophobic liquid slug). This phase change provides a more mechanically robust separator that resists fragmentation under vibration or jarring while maintaining the separation function. The liquid slug maintains its integrity better than gas slugs under physical stress.
Solution Approach 2:
The patent uses hydrophobic liquid slugs as a composite separation medium that combines the separation capability of air slugs with the mechanical robustness of liquid slugs. The hydrophobic property provides chemical compatibility with aqueous reagents while the liquid state provides physical durability against mechanical disturbances.
3Productivity
If conventional microfluidics systems are used to store and transport discrete fluid aliquots, then reagents can be delivered, but evaporation and undesired mixing occur compromising sample integrity
Solution Approach 1:
The patent introduces air slugs or hydrophobic liquid slugs as intermediary separator elements between aqueous reagent slugs. These intermediaries physically isolate the reagent slugs from each other during transport and storage, preventing direct contact and mixing while allowing individual delivery to the reaction chamber. The intermediaries act as protective barriers that maintain reagent integrity.
Solution Approach 2:
The patent uses pneumatic (air slug) and hydraulic (hydrophobic liquid slug) principles to create physical barriers between reagents. The compressible air slugs and incompressible hydrophobic liquid slugs both serve as hydraulic/pneumatic separators that prevent mixing through their immiscibility with aqueous reagents, providing a robust mechanism for maintaining sample integrity during handling.
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
The system provides stable, precise, and flexible fluid storage and delivery, maintaining slug integrity under physical disturbances, preventing evaporation and mixing, and enabling controlled recombination, thus enhancing system versatility and reducing complexity and cost.
Implementation Method 1
introducing a sequence of discrete slugs into a microchannel, wherein said sequence includes at least one aqueous slug and at least one hydrophobic slug which are adjacent to each other; and disposing an air slug between said adjacent aqueous and hydrophobic slugs
Implementation Method 2
solidifying the at least one oil slug
Implementation Method 3
acting as a solid barrier to prevent mixing
Implementation Method 4
at least one hydrophobic slug which are adjacent to each other
Data Source
AI summary
A method is provided for preventing mixing between adjacent slugs within a microchannel fluid storage and delivery system. The method includes the steps of introducing a sequence of discrete slugs into a microchannel, wherein said sequence includes at least one aqueous slug and at least one hydrophobic slug which are adjacent to each other; and disposing an air slug between said adjacent aqueous and hydrophobic slugs.