Biosensor Retaining Structure for Stable Resonator Droplet Coverage
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Solution Overview
Problem
Existing methods for immobilizing molecules on sensor surfaces, such as antibodies or antigens, face challenges with alignment due to air currents and surface changes, leading to the need for larger droplet volumes to compensate, which affects device performance and manufacturing efficiency, especially in acoustic wave sensors.
Innovation Solution
The use of a retaining structure around the target surface of a sensor, combined with a resonating structure and a droplet of functionalized material, ensures alignment and prevents wandering of the droplet, allowing for the use of smaller volumes and improving consistency in coverage and manufacturing yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If larger droplet volumes are printed to compensate for location variations, then alignment tolerance is improved, but device performance deteriorates
Solution Approach 1:
The droplet self-aligns to the resonating structure through capillary action and surface tension forces, eliminating the need for complex alignment mechanisms. The retaining structure works with the droplet's natural physical properties to achieve precise positioning without requiring larger volumes or advanced printing control
Solution Approach 2:
The solution moves from attempting to control droplet placement in 2D space (printing precision) to using a 3D retaining structure that physically confines the droplet. The vertical dimension of the retaining structure walls creates a potential well that captures the droplet, transforming the alignment problem from a planar positioning challenge to a volumetric containment solution
2Manufacturing precision
If larger droplet volumes are used to accommodate printing variations, then alignment robustness is improved, but manufacturing efficiency deteriorates
Solution Approach 1:
The system uses the droplet's own surface tension and capillary action to achieve alignment, eliminating the need for iterative printing or volume compensation. This self-aligning mechanism enables single-pass printing with high precision, directly improving manufacturing throughput
Solution Approach 2:
The retaining structure is pre-formed on the substrate before droplet deposition. This preliminary preparation creates the alignment infrastructure in advance, allowing the droplet to simply follow the pre-defined path into the retaining structure, thereby streamlining the manufacturing process
3Manufacturing precision
If larger droplet volumes are printed to ensure coverage, then coverage consistency is improved, but material waste increases
Solution Approach 1:
The retaining structure confines the functionalized material precisely to the target area around the resonating structure. This localized containment ensures that material is deposited only where needed, achieving consistent coverage without the excess material waste associated with larger droplet volumes
Solution Approach 2:
By introducing vertical confinement through retaining structure walls, the system achieves precise lateral containment of the droplet. This third-dimensional approach allows smaller droplet volumes to be used while maintaining coverage consistency, as the vertical walls prevent lateral spreading beyond the target area
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 approach enhances the consistency and efficiency of molecule immobilization on sensor surfaces, reducing variability in binding reactions and improving the performance of acoustic wave sensors by maintaining precise alignment and coverage of the functionalized material.
Implementation Method 1
a retaining structure defined in or on a substrate at least partially around a target surface... mechanical features can include a retaining structure defined in or on a substrate at least partially around a target surface
Implementation Method 2
The resonating structure is disposed on the target surface of the substrate including a piezoelectric layer
Data Source
AI summary
This disclosure describes methods and devices that assist in forming biosensors. Specifically, features that align solutions containing molecules to be immobilized on biosensors. A retaining structure may be disposed at least partially around a target surface of a substrate. A resonating structure may be disposed on the target surface. A droplet of functionalized material may be disposed on the resonating structure and the target surface, which may be auto-aligned and retained by the retaining structure on the target surface to consistently cover the resonating structure.