High-Throughput Microfiber Elasticity Measurement by Rope-Coiling
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Solution Overview
Problem
Existing methods for measuring the elasticity of tiny and fragile microfibers, such as DNA, filamentous bacteria, and carbon nanotubes, suffer from low throughput due to time-consuming and skill-intensive sample loading and unloading processes.
Innovation Solution
A microfluidic method and apparatus that utilizes rope-coiling of microfibers by axial compression, allowing for non-destructive, high-throughput elasticity measurements without the need for sample loading and unloading between consecutive measurements, using optical and laser-based techniques to measure rope-coiling parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional tensile test methods are used to measure microfiber elasticity, then measurement accuracy is maintained, but throughput remains low due to time-consuming sample loading and unloading
Solution Approach 1:
The patent extracts the sample loading and unloading steps from the measurement process by implementing a continuous flow system where microfibers are automatically transported through the measurement zone. The microfiber is fed from a reservoir through a flow cell and collected after measurement, eliminating the need for manual intervention at each measurement step.
Solution Approach 2:
The system employs automated mechanisms where the microfiber itself facilitates the measurement process. The fiber is drawn through the flow cell by fluid flow, positioned automatically in the measurement zone, and retrieved after measurement. The system serves itself by using the continuous flow to handle sample presentation and retrieval without external intervention.
2Ease of operation
If manual sample handling is used for fragile microfibers, then measurement precision is maintained, but operation complexity and skill requirements increase
Solution Approach 1:
The patent replaces manual mechanical handling with a fluid-based transport system. Microfibers are carried through the measurement apparatus by controlled fluid flow rather than mechanical manipulation. This substitution eliminates the need for skilled manual handling while reducing the complexity of mechanical gripping and positioning mechanisms.
Solution Approach 2:
The patent introduces a fluid medium as an intermediary between the operator and the fragile microfiber. The fluid carries the microfiber through the measurement process, acting as a gentle mediator that protects the fragile fiber from direct mechanical contact and handling, thereby simplifying operation while maintaining fiber integrity.
3Productivity
If destructive measurement methods are used, then elasticity data is obtained, but fiber throughput is reduced due to sample destruction
Solution Approach 1:
The patent measures elasticity by observing the coiling behavior of the microfiber in flow rather than applying destructive tensile loads. The system captures optical images of the coiling pattern and derives mechanical properties from this non-destructive observation, allowing the same fiber to continue through the system and be measured again or used in its intended application.
Solution Approach 2:
The patent changes the measurement parameter from direct tensile force application to observation of coiling morphology under flow conditions. By measuring the coiling radius and pattern formed as the fiber flows through the device, the system extracts elasticity information without destroying the fiber, maintaining throughput while achieving measurement objectives.
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 rapid, non-contact measurement of microfiber elasticity with real-time analysis, facilitating high-throughput production processes and enabling real-time process control and optimization, with throughput up to thousands of times higher than conventional methods.
Implementation Method 1
Rope-coiling refers to the buckling of a slender elastic fiber caused by axial compression
Implementation Method 2
using optical and laser-based techniques to measure rope-coiling parameters
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
The subject invention pertains to a new method for measuring the elastic properties of microfibers by rope-coiling. Rope-coiling refers to the buckling of a slender elastic fiber caused by axial compression. A continuous flow microfluidic method enables the high-throughput measurement of the elasticity of microfibers by rope-coiling, where sample loading and unloading are not needed between consecutive measurements. In certain embodiments the coiling radius can be directly proportional to the elastic modulus of the fiber, facilitating calibration to measure fiber elasticity for high-throughput applications. Throughput can be thousands of times higher than that of a tensile tester, making possible an in situ, on-line measurement in a microfluidic production line, which couples the making of microfibers and the measurement of elasticity on the same line. The new method can also measure certain fibers with local variations in elasticity.