Microtip Microplasma Arrays for Ozone Generation
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Solution Overview
Problem
Existing commercial ozone generators for large-scale ozone production are expensive, have high power requirements, and are inefficient, with conversion rates typically around 15%-18% of oxygen feedstock gas to ozone, and are prone to maintenance issues due to ceramic parts and fouling.
Innovation Solution
A method for forming arrays of microtip microplasma devices using a metal mesh with micro openings, where electrode areas are masked and electrochemically etched to encapsulate metal microtips in metal oxide, creating a monolithic structure capable of generating intense plasma for ozone production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional commercial ozone generators are used for large-scale ozone production, then ozone generation capacity is achieved, but device cost is high, power consumption is high, and conversion efficiency is low (15%-18%)
Solution Approach 1:
The patent divides the electrode structure into numerous small-scale microtips (typically 10-100 μm in size) arranged in arrays, rather than using conventional large electrodes. This segmentation enables multiple small plasma discharge zones to operate simultaneously, achieving high ozone generation capacity while reducing power consumption per unit volume and improving conversion efficiency to above 50%.
Solution Approach 2:
The patent creates highly localized plasma discharge regions at each microtip apex where the electric field is concentrated. This local quality enhancement allows intense plasma activity in small volumes, achieving high ozone production efficiency with lower overall power requirements compared to conventional distributed electrode systems.
2Productivity
If conventional ozone generators with ceramic parts are used, then ozone production is achieved, but maintenance complexity increases due to fouling and ceramic component issues
Solution Approach 1:
The patent extracts and eliminates the ceramic insulator components that are present in conventional ozone generators. By using a metal mesh structure with dielectric coating or air gaps instead, the design removes the fouling-prone ceramic parts, significantly reducing maintenance complexity while maintaining electrical insulation and ozone production capabilities.
Solution Approach 2:
The patent employs a metal mesh structure that is simpler, more durable, and easier to replace than conventional ceramic-based electrode assemblies. The metal mesh with dielectric coating provides the necessary electrical insulation without the maintenance issues of ceramic parts, enabling easier repair and replacement.
3Ease of manufacture
If metal mesh structures are used for microtip arrays, then manufacturing cost is reduced and structure is simplified, but electrical insulation between microtips must be ensured
Solution Approach 1:
The patent creates a composite structure by coating the metal mesh with a dielectric material (such as polymer or ceramic coating) or by utilizing air gaps within the mesh structure. This composite approach maintains the manufacturing advantages of metal mesh while providing the necessary electrical insulation between adjacent microtips, ensuring reliable operation.
Solution Approach 2:
The patent introduces a dielectric coating or air gap as an intermediary layer between the conductive metal microtips. This intermediary provides electrical insulation while allowing the metal mesh structure to maintain its manufacturing simplicity and cost advantages, effectively resolving the contradiction between ease of manufacture and electrical insulation reliability.
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 production of ozone with improved efficiency and reduced costs, as the microtip arrays can generate ozone from oxygen, effectively purifying air and water, and converting greenhouse gases into industrial feedstock gases, while being compact and less maintenance-intensive.
Implementation Method 1
Electrode areas of the metal mesh are masked, leaving planned connecting metal oxide areas of the metal mesh unmasked. Planned connecting metal oxide areas are electrochemically etched to convert the planned connecting metal oxide areas to metal oxide that encapsulates opposing metal microtips therein.
Implementation Method 2
Each pair of microtips is capable of producing plasma in a gas or mixture of gases lying immediately adjacent to the encapsulating dielectric and in the vicinity of a microtip pair
Implementation Method 3
Such devices are capable of igniting and sustaining glow discharges in microcavities having a characteristic dimension between approximately 5 μm and 500 μm
Implementation Method 4
Ozone is produced when oxygen (O2) molecules are dissociated by an energy source into oxygen atoms. Collisions with oxygen molecules produce ozone (O3)
Data Source
AI summary
Methods of the invention can form microtip microplasma devices having the first and second metal microtips and metal oxide in a monolithic, unitary structure. Methods can form arrays that can be flexible, can be arranged in stacks, and can be formed into cylinders, for example, for gas and liquid processing devices, air filters and other applications. A preferred method of forming an array of microtip microplasma devices provides a metal mesh with an array of micro openings therein. Electrode areas of the metal mesh are masked leaving planned connecting metal oxide areas of the metal mesh unmasked. Planned connecting metal oxide areas are electrochemically etched to convert the planned connecting metal oxide areas to metal oxide that encapsulates opposing metal microtips therein. The mask is removed. The electrode areas are electrochemically etched to encapsulate the electrode areas in metal oxide.