Crystal Encapsulated Nanoparticles Dispersion Stability
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Solution Overview
Problem
The use of nanoparticles in various applications such as propellants, composite structures, and energetic materials is limited due to their tendency to agglomerate and high surface area, which affects their handling, dispersion, and safety, and there is a need to mitigate ignition risks and improve their integration with matrices.
Innovation Solution
Encapsulating nanometric particles within micron-size crystals using a process that involves crystallizing a solution containing the particles, a micelle-forming material, and a crystal-forming material, such as ammonium perchlorate, to form core-shell composite materials, allowing for improved dispersion and reduced surface area influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If nanoparticles are used in propellants and energetic materials, then performance is significantly increased by altering the fundamental combustion process, but nanoparticles tend to agglomerate and have high surface area which limits usefulness and affects rheology
Solution Approach 1:
The patent encapsulates nanoparticles within micelle cores, creating a nested structure where the nanoparticle is contained inside the micelle. This nested configuration prevents nanoparticle agglomeration while maintaining their performance benefits, directly resolving the contradiction between combustion performance and dispersion stability.
Solution Approach 2:
The micelle acts as an intermediary carrier between the nanoparticle and the propellant matrix. The micelle-forming material serves as a mediator that disperses the nanoparticle uniformly throughout the propellant, preventing direct nanoparticle-nanoparticle contact that would lead to agglomeration.
2Use of energy by moving object
If nanoparticles are incorporated into energetic materials, then combustion efficiency is improved, but ignition risk due to hot spot formation increases
Solution Approach 1:
By nesting nanoparticles within micelle structures, the patent creates a buffer zone that prevents direct contact between nanoparticles and potential ignition sources. The micelle shell acts as a protective layer that reduces hot spot formation while maintaining combustion efficiency.
3Strength
If nanoparticles are used in composite materials, then extremely high strength is achieved, but handling and safety become significantly more challenging
Solution Approach 1:
The micelle structure provides a flexible protective shell around the nanoparticle, making the composite material easier to handle and safer to work with while maintaining the high strength properties. The micelle acts as a protective film that prevents direct exposure to potentially hazardous nanoparticle surfaces.
4Power
If nanoparticles are dispersed in propellant, then combustion performance is enhanced, but rheology of the propellant is adversely affected
Solution Approach 1:
The micelle-forming material serves as an intermediary that mediates between the nanoparticle and the propellant matrix. This intermediary prevents direct interaction between nanoparticles and the propellant binder, thereby maintaining favorable rheological properties while still enabling combustion performance enhancement.
Data Source
AI summary
The invention provides methods for encapsulating nanometric particles inside of micro-sized crystals. An exemplary embodiment involves crystallizing a solution including nanometric particles, a micelle-forming material, a nonpolar dispersant for the micelle-forming material and a crystal-forming material to form crystal-encapsulated nanometric particles. Also provided are compositions or materials which include or are formed using the crystal encapsulated nanoparticles, such compositions and materials can include propellants, cosmetics, composite structures, energetics, and pharmaceutical compositions/materials.