Nanoparticle Fabrication via Lithographic Template Molding
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Solution Overview
Problem
Current methods for fabricating non-spherical nanoparticles on a large scale are limited, hindering the development of therapeutic applications where particle size and shape are crucial for effective drug delivery and targeting.
Innovation Solution
The method involves forming a topographic template layer on a substrate using optical lithography, spin casting a particle-forming composition, and removing the template layer to isolate nanoparticles of defined size and shape, allowing for the creation of particles with controlled dimensions and shapes suitable for drug delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to fabricate nanoparticles, then production can be achieved, but particle size and shape control is insufficient for effective drug delivery
Solution Approach 1:
The patent applies preliminary action by first forming a lithographic template pattern on the substrate before introducing the particle-forming composition. The template is prepared in advance with precisely controlled features that will dictate the final particle size and shape, allowing the nanoparticles to self-assemble into the desired configuration during the spin-casting process.
Solution Approach 2:
The patent uses a lithographic template as an intermediary structure between the fabrication process and the final nanoparticle product. This template acts as a mold or guide that transfers the precise geometric patterns to the nanoparticles, enabling controlled size and shape while using standard semiconductor manufacturing equipment.
2Productivity
If non-spherical particles are fabricated using existing methods, then some shape control is achieved, but large-scale reproduction is limited
Solution Approach 1:
The patent achieves universality by adapting standard semiconductor manufacturing equipment (optical lithography tools, spin casters) for nanoparticle fabrication. This allows the use of existing high-volume production infrastructure to manufacture particles with precise shapes and sizes at scale, rather than requiring specialized equipment for each particle type.
Solution Approach 2:
The patent employs parameter changes by modifying the lithographic template features (pattern geometry, feature size, spacing) to control nanoparticle characteristics. By adjusting these template parameters, a wide variety of particle shapes and sizes can be produced using the same fabrication process, enabling both diversity and consistency in particle design.
3Reliability
If particles with precise size and shape are created, then therapeutic efficacy is enhanced, but fabrication complexity increases
Solution Approach 1:
The patent replaces complex mechanical particle fabrication methods with a chemical/self-assembly approach. Instead of using mechanical forces to shape particles, the method uses lithographic patterning combined with spin-casting to guide particle formation, leveraging self-assembly processes to achieve precise morphology with simpler overall fabrication steps.
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 reproducible fabrication of nanoparticles with precise size and shape, enhancing their therapeutic efficacy by improving drug delivery and targeting capabilities.
Implementation Method 1
forming by optical lithography a topographic template layer disposed on a surface of a substrate
Implementation Method 2
spin casting a particle-forming composition onto the template layer, thereby forming a composite layer
Implementation Method 3
removing the composite layer from the substrate using a stripping agent that dissolves the template polymer without dissolving the particles
Data Source
AI summary
A method of preparing particles comprises forming by optical lithography a topographic template layer disposed on a surface of a substrate, which is suitable for spin casting. The template layer comprises a non-crosslinked template polymer having a pattern of independent wells therein for molding independent particles. Spin casting a particle-forming composition onto the template layer forms a composite layer comprising the template polymer and the particles disposed in the wells. The composite layer is removed from the substrate using a stripping agent that dissolves the template polymer without dissolving the particles. The particles are then isolated.