Curved Electrode Plasma Device for Linear Reactive Gas Beam
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Solution Overview
Problem
Existing low-temperature, atmospheric pressure plasma technologies are limited in generating a linear beam of reactive gas species, making it difficult to rapidly treat both flat and 3-dimensional substrates of any size or shape, as previous designs produce a small spot plasma with low reactive species concentration, resulting in slow processing rates.
Innovation Solution
A plasma device with a curved electrode and a high-frequency power source generates a low-temperature, atmospheric pressure plasma, producing a linear beam of reactive gas species by forming an annular space between the electrode and the housing, allowing the plasma to treat substrates over a wide range of distances and sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a small spot plasma is used for surface treatment, then the device complexity is low, but the productivity is slow due to limited processing area
Solution Approach 1:
The patent transitions from a point-source plasma (0D) to a linear plasma beam (1D) by using a planar electrode configuration that generates plasma along a line rather than at a single point. This dimensional change allows the reactive species to be distributed over a extended linear region, enabling simultaneous treatment of larger substrate areas and dramatically increasing processing throughput without requiring complex multi-element devices
Solution Approach 2:
The plasma generation region is segmented into multiple discharge zones along the linear electrode structure, with gas flowing through and ionizing at different positions. This segmentation creates a distributed source of reactive species that maintains high concentration while extending the treatment area, resolving the contradiction between localized plasma intensity and overall processing speed
2Adaptability or versatility
If the substrate is placed close to the electrode for adequate treatment, then the reactive species concentration is high, but the adaptability is limited for 3-dimensional objects of various sizes
Solution Approach 1:
The patent introduces a flowing gas stream as an intermediary carrier that transports reactive species from the plasma generation zone to the substrate. This gas mediator allows the substrate to be positioned at a practical distance from the electrode while still receiving adequate flux of reactive species, enabling treatment of 3-dimensional objects of various sizes and shapes without requiring intimate proximity to the plasma source
Solution Approach 2:
The linear plasma beam configuration extends the reactive species source in one dimension, creating a distributed emission region that can accommodate substrates of varying distances and orientations. This linear geometry provides spatial flexibility for treating complex 3-dimensional objects while maintaining sufficient reactive species flux across the treatment zone
3Productivity
If a linear beam of reactive gas species is generated, then the productivity increases for rapid substrate treatment, but the device complexity increases with curved electrode and annular space configuration
Solution Approach 1:
The housing structure serves multiple functions: it provides mechanical support, defines the annular discharge geometry, guides gas flow, and collects or directs the linear plasma beam. This multi-functionality reduces the need for additional separate components, achieving the linear plasma configuration with a relatively simple integrated structure that delivers high processing speeds
Solution Approach 2:
The curved electrode and annular space configuration creates a uniform electric field distribution that stabilizes the plasma discharge and maintains consistent reactive species generation along the linear beam. This curved geometry, while appearing complex, provides inherent field uniformity that simplifies control and achieves high productivity through stable, continuous plasma production
4Productivity
If atmospheric pressure plasma is used for continuous mode operation, then the productivity is high for assembly line processing, but the temperature control becomes difficult to maintain low temperatures
Solution Approach 1:
The patent employs continuous gas flow through the plasma discharge zone, which continuously removes heated gas and replaces it with fresh cool gas. This continuous action maintains low temperature in the reactive species beam despite atmospheric pressure operation, enabling sustained high-speed processing on assembly lines without thermal damage to substrates
Solution Approach 2:
The flowing gas acts as a thermal management system, using fluid dynamics to control temperature. The continuous movement of gas through the discharge region provides efficient heat removal through convection, allowing atmospheric pressure plasma to operate in continuous mode with controlled temperatures suitable for sensitive substrate processing
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 rapid surface treatment, activation, cleaning, sterilization, and coating of substrates with a high-speed, continuous process, significantly improving processing rates compared to prior art by maintaining a uniform plasma beam across a wide area.
Implementation Method 1
A plasma device with a curved electrode and a high-frequency power source generates a low-temperature, atmospheric pressure plasma
Implementation Method 2
the plasma produces a linear beam of reactive gas species
Implementation Method 3
Radio frequency power at 13.56 MHz is well suited for this invention
Data Source
AI summary
Devices and methods for generating a low-temperature, atmospheric pressure plasma are disclosed. A plasma device may include a first electrode having an inlet for a gas, a second electrode having an outlet for the gas and disposed proximate to the first electrode to form a substantially uniform gap therebetween. The gas flows along the substantially uniform gap and from a plurality of different directions to converge and flow through the outlet. High frequency electrical power is applied between the first electrode and the second electrode to generate a plasma within the gas flow emerging at the outlet. Precursor chemicals are added to the plasma flow at the outlet. Various electrode designs may be implemented and various applications involving surface treatment of materials with the low-temperature atmospheric plasma, including surface activation, cleaning, sterilization, etching and deposition of thin films are disclosed.