Microchannel Valve Using Electromagnetic Heating for Rapid Opening
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Solution Overview
Problem
Conventional valve units for biochemical reactions require a significant amount of time to open microchannels, are difficult to precisely control, and face challenges with thermal conductivity variations when using plastics, making them less precise and harder to miniaturize.
Innovation Solution
A valve unit incorporating a plug with a phase change material and fine heat-dissipating particles that absorbs electromagnetic wave energy to rapidly melt and open the channel, eliminating the need for a heating unit on the substrate and allowing for precise control over channel opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a heating unit is directly provided on the substrate to melt the paraffin wax, then the microchannel can be opened, but a large amount of time is required and precision control is difficult
Solution Approach 1:
The patent replaces the conventional thermal conduction heating system with an electromagnetic radiation-based heating system. The paraffin wax contains particles that absorb electromagnetic waves (such as microwave or radio frequency waves), enabling direct volumetric heating throughout the wax rather than slow conductive heating from the substrate. This substitution of heating mechanism dramatically reduces the time required to melt the wax and open the channel.
Solution Approach 2:
The patent changes the heating parameter from low-power continuous thermal conduction to high-power electromagnetic radiation absorption. By incorporating particles with specific electromagnetic absorption characteristics into the paraffin wax, the system can rapidly convert electromagnetic energy into thermal energy, achieving quick melting and channel opening while allowing precise temporal control through modulation of the electromagnetic wave input.
2Manufacturing precision
If a heating unit is directly provided on the substrate, then the microchannel can be opened, but precision varies due to thermal conductivity differences in substrate materials
Solution Approach 1:
The patent replaces substrate-dependent thermal conduction heating with substrate-independent electromagnetic radiation heating. Since electromagnetic waves can penetrate and heat the paraffin wax directly regardless of the substrate material's thermal properties, the system achieves consistent precision across different substrate materials including plastics, glass, and silicon. The heating precision is no longer limited by the thermal conductivity of the substrate.
3Productivity
If a heating unit is directly provided on the substrate, then the microchannel can be opened, but the device size increases and miniaturization becomes difficult
Solution Approach 1:
The patent extracts the heating function from the substrate structure and relocates it to the paraffin wax itself by incorporating electromagnetic-absorbing particles within the wax. This eliminates the need for a separate heating unit on the substrate, reducing device complexity and enabling miniaturization. The heating capability is now an intrinsic property of the valve material rather than an external component.
Solution Approach 2:
The patent merges the heating function with the valve material by incorporating electromagnetic-absorbing particles directly into the paraffin wax matrix. This combination creates a multifunctional material that serves both as the sealing/valving agent and the heating element, eliminating the need for separate heating components and reducing overall device size.
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 solution enables faster and more precise control over microchannel opening, reduces manufacturing costs by eliminating the need for a heating unit, and improves precision across different substrate materials, including plastics.
Implementation Method 1
a plurality of fine heat-dissipating particles dispersed in the phase change material, the heat-dissipating particles dissipate heat by absorbing an electromagnetic wave energy generated by electromagnetic wave radiation from the outside
Implementation Method 2
an external energy source irradiating an electromagnetic wave on the plug, wherein, irradiation of the electromagnetic wave on the plug from the outside causes the plurality of fine heat-dissipating particles to dissipate heat
Implementation Method 3
a plug including a phase change material in a solid state at a room temperature
Implementation Method 4
cause the phase change material to be molten opening the path
Data Source
AI summary
A valve unit and an apparatus having the same include a plug which includes a phase change material in a solid state at a room temperature and a plurality of fine heat-dissipating particles dispersed in the phase change material. The fine heat-dissipating particles dispersed in the phase change material dissipate heat by absorbing an electromagnetic wave energy generated by electromagnetic wave radiation from the outside and block fluid flow in a path formed by a channel. As an external energy source irradiates an electromagnetic wave on the plug, the plurality of fine heat-dissipating particles dissipate heat and the phase change material becomes molten, thus opening the path to allow the fluid to flow.