Planar Microparticle Foot Structure for Chemical-Free Release
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Solution Overview
Problem
Existing methods for producing elongate planar microparticles with molecular or nanoparticle multiplexing face challenges in achieving high production yield and controlled release without damaging the microparticles or affecting functionalization, particularly due to the use of chemical agents that can be aggressive to the surface molecules.
Innovation Solution
The method involves producing microparticles with an elongate, essentially rectangular shape and incorporating side wings, supported by feet with a round cross-section, allowing for controlled mechanical release without chemical agents, thus preserving the integrity of the microparticles and their functionalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If chemical agents are used to release microparticles from the substrate, then the microparticles can be separated from the production substrate, but the chemical agents may be aggressive to the multiplexed molecules or nanoparticles on the particle surface
Solution Approach 1:
The microparticle is segmented into two parts: the main particle body containing the multiplexed molecules/nanoparticles, and the foot structure that attaches to the substrate. This segmentation allows the foot to be selectively removed while preserving the integrity of the particle and its surface molecules.
Solution Approach 2:
The foot structure is extracted as a separate sacrificial element that can be removed from the particle-substrate assembly. By applying mechanical stress specifically to the foot region, the foot is broken and removed, releasing the particle without exposing the sensitive surface molecules to harmful chemical agents.
2Ease of manufacture
If elongate microparticles are produced with elongate feet, then the production process is simplified, but the mechanical stresses during release transmit to the microparticles and break both the feet and microparticles
Solution Approach 1:
There is an asymmetry in the geometry and material properties between the foot and the particle body. The foot has a round cross-section and is designed to be mechanically weaker, while the particle body maintains its elongate shape and structural integrity. This asymmetric design ensures that during mechanical release, stress concentrates in the foot rather than the particle.
Solution Approach 2:
The foot region is designed with local quality differences - a round cross-section and specific material composition - that make it mechanically distinct from the particle body. This local differentiation allows the foot to serve as a sacrificial element that fails first under mechanical stress, protecting the particle.
3Device complexity
If microparticles are produced without side wings, then the production process is simpler, but elongate feet are created that transmit mechanical stresses to the microparticles during release
Solution Approach 1:
The particle geometry is segmented into a central body and lateral side wings. This segmentation creates corresponding segments in the foot structure, allowing the foot to be positioned specifically under the central body rather than extending under the entire particle including the wings. This spatial segmentation prevents stress transmission to the particle during release.
Data Source
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AI summary
The invention relates to a method for producing elongate planar microparticles (1) that increases the production yield of these microparticles (1) and comprises the steps of: preparing a structuring layer of a microparticle (1) starting material on a substrate (2); defining the shape of the microparticles (1) in the structuring layer by using a photolithography technique and an engraving technique that defines the thickness of the microparticles (1), where the shape of the microparticles (1) is such that it comprises an elongate central body (3) with longer sides and shorter sides, with at least two side wings (4) extending from the longer sides; and forming one or more feet (5) with a circular section in an upper portion of the substrate (2) that is under the structuring layer.