Capillary Channel Assembly of Microfibers for Complex Braids
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Solution Overview
Problem
Current methods for manipulating and assembling micro- and nanoscale braids are limited by the unsuitability of mechanical approaches, which are non-programmable and can only produce a limited number of topologies, and are not scalable for delicate fibers smaller than 100 micrometers in diameter.
Innovation Solution
A device utilizing repulsive capillary forces between walls and floats with different contact angles to manipulate and assemble micro- and nanoscale fibers by moving and rotating them within channels, allowing for the formation of complex braids through programmed movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical approaches are used to fabricate complex braids, then the structure can be formed, but the method is non-programmable and limited to a limited number of topologies
Solution Approach 1:
The patent replaces complex mechanical braiding machines with a capillary-based system where liquid flow through channels with varying cross-sections automatically guides fibers into desired braid topologies. The channel geometry itself encodes the braid pattern, eliminating the need for programmable mechanical control while enabling arbitrary topologies.
Solution Approach 2:
The patent varies the cross-sectional parameters of the channels along the flow direction to control fiber assembly. By changing channel width, height, or shape at different positions, the system programmably directs fibers into complex braid patterns without mechanical actuators.
2Productivity
If mechanical machines are used to fabricate braids, then the structure can be formed, but the forces applied would break smaller fibers and the method is not scalable
Solution Approach 1:
The patent uses liquid flow (hydraulics) to transport and assemble fibers. The capillary forces generated by the liquid meniscus in the channels provide gentle, distributed forces that can handle delicate micro- and nanoscale fibers without breaking them, enabling scalability to smaller fiber dimensions.
Solution Approach 2:
The patent changes the physical state and flow parameters of the liquid carrier to control the forces acting on fibers. By adjusting flow rate, viscosity, or channel dimensions, the system optimizes the capillary forces to be strong enough to assemble fibers but gentle enough to prevent damage, enabling scalable fabrication.
3Adaptability or versatility
If industrial machines are used to fabricate braids, then the structure can be formed, but each machine is not programmable and can make only a limited number of topologies
Solution Approach 1:
The patent divides the braiding process into discrete channel segments, each with a specific cross-sectional geometry that performs a particular assembly function. By segmenting the device into modular channel sections, complex topologies are achieved through simple geometric divisions rather than complex mechanical programming.
Solution Approach 2:
The patent designs the system so that the liquid flow and capillary forces automatically perform the assembly work without external control. The channel geometry self-determines the braid topology, eliminating the need for programmable control systems while maintaining high design flexibility.
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 method enables the scalable and cost-effective assembly of arbitrary braids of delicate micro- and nanoscale fibers by leveraging repulsive capillary forces, which are strong enough to handle fragile fibers without breaking them, and allows for the creation of complex structures with a single moving part.
Implementation Method 1
the one or more floats have a surface characteristic that is different from the surface characteristic of the walls such that, upon contact with a fluid, said walls and said floats form different contact angles and induce a repulsive capillary force between the walls and the one or more floats at a surface of the fluid
Data Source
AI summary
In some aspects, a device comprises a plurality of walls defining one or more channels; wherein the one or more channels have a cross-section in a plane perpendicular to a vertical axis of the device that changes along the vertical axis; and one or more floats sized to allow movement of the one or more floats within said one or more channels, wherein the one or more floats have a surface characteristic that is different from the surface characteristic of the walls such that, upon contact with a fluid, said walls and said floats form different contact angles and induce a repulsive capillary force between the walls and the one or more floats at a surface of the fluid.