Microfluidic Receiving Element With Protrusions
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Solution Overview
Problem
Existing microfluidic devices face challenges with incomplete filling of cavities due to pinning of the phase interface at the edges, leading to inhomogeneous wetting and potential gas entrapment.
Innovation Solution
A microfluidic receiving element with recesses featuring protrusions and non-convex cross-sectional areas is designed to reduce pinning by creating microfluidic capillary paths, ensuring homogeneous wetting and complete filling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cavity or through-hole recesses are used in microfluidic devices, then the device structure is simple, but pinning of the phase interface at the edges occurs leading to incomplete filling and inhomogeneous wetting
Solution Approach 1:
The invention applies local quality by creating protrusions at specific locations (edges or corners) of the recess cross-section. These localized structural modifications concentrate the wetting-promoting features exactly where pinning occurs most frequently, rather than uniformly modifying the entire recess structure. This allows targeted resolution of the pinning problem while maintaining overall structural simplicity.
Solution Approach 2:
The recess edge is segmented into multiple protrusions rather than forming a continuous smooth edge. This segmentation creates discrete wetting initiation points that independently promote liquid penetration. The segmented structure allows the liquid phase interface to bypass the pinning effect by providing multiple alternative pathways into the recess.
2Reliability
If recesses with smooth edges are used, then manufacturing is easier, but gas entrapment occurs due to pinning at the edges
Solution Approach 1:
Rather than complicating the entire recess structure, the invention applies local quality by adding protrusions only at critical edge locations where gas entrapment is most likely to occur. This localized approach effectively prevents gas entrapment while minimizing the impact on manufacturing complexity.
3Reliability
If conventional recess geometries are used, then the device is easier to operate, but wetting homogeneity is poor
Solution Approach 1:
The invention achieves wetting homogeneity through local quality modifications at the recess edges. The protrusions create consistent wetting initiation points that ensure uniform liquid distribution across all recesses, improving reliability without requiring changes to the overall device operation procedure.
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 design achieves reliable and complete filling of recesses with aqueous solutions, preventing gas entrapment and ensuring uniform wetting, thereby enhancing the microfluidic processing efficiency.
Implementation Method 1
The receiving element is characterized in that at least one protrusion with a preferably hydrophilic surface quality is formed in a side wall of the recess and the recess has a non-convex cross-sectional area in the plane of an upper side of the receiving element... the occurrence of so-called pinning of the phase interface to the edge of the recess can be significantly reduced
Implementation Method 2
at least one protrusion with a preferably hydrophilic surface quality is formed in a side wall of the recess... spatially particularly homogeneous wetting of the receiving element in a flow cell can be achieved
Data Source
AI summary
A microfluidic receiving element for a microfluidic device for processing fluids has at least one recess for receiving an aqueous solution, wherein the at least one recess is in the form of a cavity or through-hole. At least one protrusion is formed in a side wall of the recess, having a preferably hydrophilic surface quality, and the recess has a non-convex cross-sectional area in the plane of an upper side of the receiving element.