Multilayer Nanoporous Membrane Template for Complex Nanostructures
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Solution Overview
Problem
Current nanomaterial synthesis methods, such as top-down micro/nano fabrication and bottom-up chemical synthesis, face challenges in producing non-spherical nanomaterials with controlled size, shape, and composition, limiting their applications in biomedical and industrial uses, and conventional nanoporous templates have restricted pore geometry and chemistry, hindering the creation of complex nanostructures.
Innovation Solution
The development of multilayer porous membranes with individually controllable nanosized pore sizes and distributions, achieved by depositing layers of materials with different solubility and nuclear track etching characteristics, and irradiating them with high-energy particles to form pores, allowing for the fabrication of complex nanostructures through selective dissolution and electrodeposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If top-down micro/nano fabrication technologies are used, then dimensional and compositional control is achieved, but equipment complexity and processing cost increase
Solution Approach 1:
The patent uses nanoporous templates as intermediary structures to enable bottom-up nanofabrication with top-down level precision. The templates serve as mediators that guide material deposition and self-assembly, achieving controlled dimensional and compositional properties without requiring complex lithographic equipment or deposition/etching tools.
Solution Approach 2:
The patent replaces mechanical top-down fabrication systems (lithography, deposition, etching) with chemical-based bottom-up synthesis approaches. By using template-directed self-assembly and chemical reactions, the system achieves comparable manufacturing precision while eliminating the need for expensive and complex mechanical fabrication equipment.
2Productivity
If bottom-up chemical synthesis is used, then large quantity of nanomaterials is produced at low cost, but control over nanoparticle size, shape and composition is limited
Solution Approach 1:
The patent segments the nanofabrication process into two independent stages: template preparation (controlling geometry) and material deposition (controlling composition). This segmentation allows each stage to be optimized separately, enabling precise control over size, shape, and composition while maintaining high productivity and low cost through parallel processing.
Solution Approach 2:
The patent employs parameter changes in the template structure (pore size, pore distribution, layer thickness) and deposition conditions (concentration, temperature, time) to precisely control nanoparticle properties. By systematically varying these parameters, the method achieves superior control over size, shape, and composition compared to conventional bottom-up approaches.
3Ease of manufacture
If conventional nanoporous templates are used, then nanofabrication is simplified, but pore geometry and chemistry are restricted
Solution Approach 1:
The patent uses composite membrane structures combining different polymer materials (e.g., polycarbonate and polyethylene terephthalate) in multilayer configurations. This composite approach enables independent optimization of each layer's properties, providing versatile control over pore geometry, chemistry, and functionality while maintaining ease of manufacture through solution casting and phase separation techniques.
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 approach enables the cost-effective production of nanostructures with varied shapes and functionalities, suitable for applications like MRI contrast agents and water treatment, offering improved biofunctionalities and enhanced properties not achievable with traditional methods.
Implementation Method 1
The membrane may be irradiated with high energy particles to form one or more pores in the membrane
Implementation Method 2
The use of layers of materials with different chemical solubility and nuclear track etching characteristics that are put together to produce nanoporous templates with individually controllable nanosized pore diameters
Implementation Method 3
A nanostructure material is deposited in and through the pores of the membrane by preparing a metal layer on the membrane to aid in formation of a nanostructure, wherein said metal layer is an electrode
Data Source
AI summary
Multilayer porous membranes and methods for fabricating the membranes may have applications in filtration, separation, and nanomanufacturing. The layers of the membrane may be selected based on different physiochemical properties, such as ionization rate and/or etch rate. The pores may be formed by high energy particle bombardment and chemical etching. In some embodiments, the multilayer porous membrane may be utilized to form complex nanostructures by selecting different materials for the layers based on physiochemical properties, layer thickness, stacking sequence, and/or varying the pore generation process.