Porous Carbon Nanotube Sheets via Microorganism Decomposition
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Solution Overview
Problem
Current methods for generating porous structures, such as direct templating, are costly and inefficient for large-scale device fabrication due to expensive template materials and complex synthesis processes, and polymer binders can increase dead mass and cause side reactions in devices.
Innovation Solution
A method using microorganisms as pore templating materials, where microorganisms and matrix materials are dispersed, forming a matrix sheet with the microorganisms decomposed to create pores, offering a cost-effective, binder-free, and scalable approach for producing porous sheets with controlled pore sizes and shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If preformed templates are used for pore generation, then pore structures can be introduced easily and controllably, but template materials are expensive and difficult to remove
Solution Approach 1:
The patent uses ice as a temporary, inexpensive template that naturally disappears upon warming, eliminating the need for complex removal processes. The ice templates are formed by freezing water within the porous structure, and simply warming the device causes the ice to melt and drain away, leaving clean pores without requiring chemical etchants or complex removal procedures.
Solution Approach 2:
The patent exploits the phase transition of water between solid (ice) and liquid states. By freezing water to create ice templates and then warming to melt them, the process utilizes a reversible phase change to achieve template formation and removal. This phase transition approach simplifies the overall manufacturing process compared to using permanent template materials that require chemical or mechanical removal.
2Strength
If polymer binders are used to hold porous structure, then free-standing form is achieved, but dead mass increases and side reactions occur
Solution Approach 1:
The patent removes polymer binders entirely from the system by using ice templates that melt away during operation. The ice templates serve their structural support function during assembly and operation, then naturally disappear through phase transition, leaving no residual dead mass or side-reaction-prone materials in the final device.
Solution Approach 2:
The ice templates are self-eliminating through their own phase transition properties. Rather than requiring external removal mechanisms or leaving behind harmful residues, the ice naturally melts and drains away when warmed, providing structural support when needed and automatically removing itself when no longer required, without introducing harmful side effects.
3Ease of manufacture
If conventional template materials are used, then pores can be generated, but material cost increases for large scale fabrication
Solution Approach 1:
The patent replaces expensive conventional template materials with ice, an abundant and essentially free material. The ice templates are formed by simply freezing water, which costs nothing, and their temporary nature is advantageous rather than detrimental since they naturally disappear after serving their purpose, eliminating disposal costs and environmental remediation expenses.
Solution Approach 2:
The patent changes the physical state parameter of water from liquid to solid (freezing) to create the template structure, then back to liquid (melting) to remove it. This parameter change approach uses the inherent properties of water rather than requiring expensive specialized materials, dramatically reducing material costs while maintaining effective pore generation capability.
4Ease of manufacture
If current pore generators are used, then pores can be created, but scale-up is limited due to complicated synthesis and high cost
Solution Approach 1:
The patent uses a parameter change approach where water is frozen to create templates and then melted to remove them. This simple phase transition process can be applied at any scale without requiring complex synthesis procedures, enabling easy scale-up from laboratory to industrial production of porous devices.
Solution Approach 2:
The patent segments the pore generation process into two simple, independent steps: freezing water to create ice templates, then warming to melt and remove them. This segmentation into basic, universally applicable steps eliminates the need for complex, scale-limited synthesis procedures and allows the process to be easily scaled by simply adjusting the volume of water frozen.
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 method enables the production of porous sheets with controlled porosity and structure, enhancing mass transport and reaction efficiency in devices like batteries and solar cells, while reducing material costs and avoiding side reactions.
Implementation Method 1
decomposing the microorganisms from the matrix sheet to form the porous sheet
Data Source
AI summary
A method of preparing a porous sheet includes mixing a matrix material dispersion including a matrix material dispersed in a first dispersion medium with a microorganism dispersion including microorganisms in a second dispersion medium, to form a mixture. The first and the second dispersion media are removed from the mixture to form a matrix sheet, and the microorganisms are decomposed from the matrix sheet to form the porous sheet.