Liquid Metal Conductive Pathways in Microfluidic Networks
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Solution Overview
Problem
Conventional methods for integrating microfluidic components and electrical circuits in microfluidic devices are challenging due to the difficulty in combining and integrating separate microfluidic components and conductive pathways effectively, especially in forming complex three-dimensional structures and flexible circuits.
Innovation Solution
The development of microfluidic devices where conductive pathways are formed by solidifying liquid metal within microfluidic channels, allowing for the creation of flexible electrical connections and circuits, and enabling the formation of self-assembled structures that can interact with flowing fluids or be used as standalone structures, using techniques such as cooling liquid metal within channels to create solid metal pathways and re-forming connections as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional separate structures for microfluidic components and conductive pathways are used, then manufacturing simplicity is maintained, but integration complexity and device functionality are limited
Solution Approach 1:
The patent combines microfluidic channels and conductive pathways into a single integrated structure by co-injecting liquid precursor materials that are subsequently cured together, creating a unified device where fluid flow and electrical conduction occur within the same physical architecture rather than as separate components
Solution Approach 2:
The integrated microfluidic device performs multiple functions simultaneously - fluid transport, electrical conduction, and signal transmission - within a single structure, allowing one component to serve multiple purposes that previously required separate devices
2Manufacturing precision
If complex three-dimensional microstructures are fabricated using conventional methods, then structural precision is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses liquid precursor materials that are injected through microfluidic channels under pressure to fill complex three-dimensional spaces, allowing precise deposition of conductive and structural materials in difficult-to-reach geometries without requiring complex fabrication equipment
Solution Approach 2:
The invention changes the physical state of materials from solid to liquid during fabrication, injecting liquid precursors that can flow into complex geometries, then curing them in place to achieve precise three-dimensional structures that would be difficult to manufacture using conventional solid-state fabrication methods
3Reliability
If rigid conductive pathways are used, then electrical connection stability is improved, but device flexibility and reconfigurability are reduced
Solution Approach 1:
The patent creates conductive pathways from curable liquid precursors that can transition from a fluid state during injection to a solid state after curing, enabling the device to be reconfigured by re-melting and re-injecting the material, thus providing both stability when cured and flexibility when molten
Solution Approach 2:
The invention utilizes phase transitions of the conductive material between liquid and solid states - liquid for injection and reconfiguration, solid for stable electrical conduction - allowing the same material to provide both flexibility during manufacturing and reliability during operation
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 enables the fabrication of complex, flexible electronic circuits and devices with embedded metal structures that can affect fluid properties or particles within microfluidic systems, offering improved integration and versatility in microfluidic device design.
Implementation Method 1
causing a liquid metal to flow into at least a portion of the substantially enclosed microfluidic channel and cooling the liquid metal within the substantially enclosed microfluidic channel to a temperature less than its melting point, thereby causing the metal to become a solid
Data Source
AI summary
Disclosed herein are a variety of microfluidic devices and solid, typically electrically conductive devices that can be formed using such devices as molds. In certain embodiments, the devices that are formed comprise conductive pathways formed by solidifying a liquid metal present in one or more microfluidic channels (such devices hereinafter referred to as “microsolidic” devices). In certain such devices, in which electrical connections can be formed and/or reformed between regions in a microfluidic structure; in some cases, the devices/circuits formed may be flexible and/or involve flexible electrical components. In certain embodiments, the solid metal wires/conductive pathways formed in microfluidic channel(s) may remain contained within the microfluidic structure. In certain such embodiments, the conductive pathways formed may be located in proximity to other microfluidic channel(s) of the structure that carry flowing fluid, such that the conductive pathway can create energy (e.g. electromagnetic and/or thermal energy) that interacts withy and/or affects the flowing fluid and/or a component contained therein or carried thereby. In other embodiments, a microsolidic structure may be removed from a microfluidic mold to form a stand-alone structure. In certain embodiments, the solid metal structures formed may interact with light energy incident upon a structure or may be used to fabricate a light-weight electrode. Another aspect of the invention relates to the formation of self-assembled structures that may comprise these electrically conductive pathways/connections.