Microfiltration Press for Uniform Nanomaterial Sheets
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Solution Overview
Problem
Conventional methods for producing large, uniform sheets of nanomaterials face challenges such as reduced purity and nanomaterial content due to the use of additives and binders, uneven deposition rates, non-uniform dispersion, and inefficient flow patterns, which result in sheets with compromised strength and surface finish.
Innovation Solution
A novel microfiltration press with a movable lower platen, asymmetric fluid pathways, a closed-loop fluid control system, and a porous metallic substrate support for the filter media, allowing for controlled nanoparticle deposition and high-pressure processing without binders or adhesives, ensuring uniform thickness and high nanomaterial content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional solvent casting is used to produce large sheets, then sheet size is increased, but purity and nanomaterial content are reduced due to additives and binders
Solution Approach 1:
The invention extracts and eliminates additives, binders, surfactants, and adhesives from the nanomaterial sheet production process. By using microfiltration of aqueous nanomaterial suspensions without these conventional additives, the process produces large sheets while maintaining high nanomaterial content and purity, directly resolving the contradiction between sheet size and nanomaterial content.
2Quantity of substance
If conventional microfiltration is used to produce high nanomaterial content sheets, then nanomaterial content is improved, but sheet uniformity is sacrificed when scaled upward
Solution Approach 1:
The invention segments the feed platen into multiple regions with multiple inlet nozzles and flow dispersers. This segmentation allows for controlled distribution of nanomaterial suspension across the filter membrane surface, enabling uniform deposition even at large sheet scales while maintaining high nanomaterial content.
Solution Approach 2:
The invention employs asymmetric fluid pathways in the flow dispersers, creating intentional non-uniform flow patterns that compensate for natural deposition variations. The asymmetric design ensures uniform nanomaterial distribution across the sheet, resolving the contradiction between high nanomaterial content and sheet uniformity at scaled dimensions.
3Device complexity
If constant pressure is applied in conventional microfiltration, then processing is simplified, but deposition rate decreases as sheet thickness increases
Solution Approach 1:
The invention transitions from static constant pressure to dynamic pressure control. The feed platen incorporates flow dispersers with asymmetric pathways that actively adjust fluid distribution as deposition progresses, maintaining optimal deposition rate throughout the process while managing the increasing sheet thickness.
Solution Approach 2:
The system implements feedback control where flow sensors monitor the deposition process and the control system adjusts pressure and flow distribution accordingly. This feedback mechanism maintains consistent deposition rates even as sheet thickness increases, resolving the contradiction between process simplicity and productivity.
4Device complexity
If single inlet nozzle is used in conventional microfiltration, then device complexity is reduced, but particle dispersion uniformity is poor
Solution Approach 1:
The invention segments the single inlet nozzle into multiple inlet nozzles distributed across the feed platen. Each nozzle is equipped with flow dispersers that create localized uniform deposition patterns. This segmentation achieves uniform particle dispersion across the entire sheet while maintaining reasonable device complexity.
Solution Approach 2:
The flow dispersers serve multiple functions: they distribute suspension uniformly, create appropriate flow patterns, and facilitate particle deposition. This multi-functionality achieves uniform dispersion without proportionally increasing device complexity, as the same components perform multiple critical functions.
5Ease of manufacture
If cloth support structure is used in conventional microfiltration, then filtration is enabled, but surface finish becomes rough and sheet integrity is compromised
Solution Approach 1:
The invention replaces cloth support with a porous metallic substrate that provides filtration capability while maintaining a smooth surface. The porous structure enables fluid passage for filtration, while the metallic substrate's inherent smoothness prevents surface roughness and sheet damage, resolving the contradiction between filtration capability and surface finish.
6Reliability
If O-ring gasket is used in conventional microfiltration, then sealing is achieved, but membrane is crushed at high pressures
Solution Approach 1:
The porous metallic substrate serves dual functions: it provides the filtration surface and acts as a rigid support structure that protects the filter membrane from crushing at high pressures. The substrate's mechanical strength maintains membrane integrity while its porous structure enables filtration, resolving the contradiction between sealing capability and membrane strength.
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 the production of strong, uniform nanomaterial sheets with high purity and high nanomaterial content, maintaining a consistent deposition rate and surface finish, and preventing sheet damage during processing.
Implementation Method 1
Conventional microfiltration devices make sheets of nanomaterials by forcing an aqueous solution of nanomaterial particles through a filter at high pressures
Implementation Method 2
forcing an aqueous solution of nanomaterial particles through a filter at high pressures
Data Source
AI summary
A batch-automated microfiltration press for producing large uniform thickness nanomaterial sheets includes a filtration envelope of variable size that is defined between an upper platen having a fixed position and a lower platen disposed in spaced apart, parallel relation to the upper platen. The upper platen has a plurality of input nozzles and a plurality of flow dispersers associated with each of the input nozzles. Nanoparticles are deposited onto a fine filter membrane positioned in the filtration envelope. Flow channels and drain holes are formed in the lower platen. Each of the flow channels has a non-linear path of travel. A closed-loop fluid control system maintains a predetermined rate of nanoparticle deposition onto the fine filter membrane. A motion control system controls the raising and the lowering of the lower platen, maintaining a constant displacement instead of constant pressure, enabling the production of clean, undamaged sheets of nanomaterial papers.