Reactive Nanocomposites via Protein Cage Oxidizer Segmentation

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Solution Overview

Problem

Existing methods for manufacturing reactive nanocomposites face challenges such as poor mass transport, uneven distribution of components, and instability due to the sensitivity of reactive materials, leading to suboptimal performance in energetic formulations.

Innovation Solution

The method involves loading positively-charged protein cages with oxidizers and assembling them onto metal nanoparticles to form reactive nanocomposites, allowing for the creation of multi-layer structures with controlled stoichiometry and enhanced reaction kinetics by reducing diffusion distances and stabilizing the oxidizing agents within the protein cages.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional methods (powder compaction, melt blending, solution mixing) are used to manufacture reactive nanocomposites, then uniform nanocomposite structure is attempted to be achieved, but poor mass transport and large diffusion distances result in uneven distribution of nanocomposite components

Engineering Contradiction:

Improveuniform distribution of nanocomposite componentsVSAvoidmass transport efficiency

Core Design Contradiction:

Manufacturing precisionVSQuantity of substance

Solution Approach 1:

The invention segments the oxidizer into discrete protein cage units that can be individually attached to metal nanoparticle surfaces. This segmentation enables precise spatial distribution of oxidizer molecules throughout the nanocomposite structure, eliminating the aggregation and uneven distribution problems associated with conventional bulk mixing methods.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The oxidizer molecules are nested within the hollow interior cavities of protein cages, which then attach to the metal nanoparticle surface. This nested structure allows the oxidizer to be contained within protective protein shells while maintaining close proximity to the metal fuel particles, thereby reducing diffusion distances and improving mass transport efficiency.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Ease of manufacture

If reactive nanocomposites are manufactured using conventional methods, then material processing is attempted, but poor chemical and physical interaction between components results in suboptimal performance

Engineering Contradiction:

Improveprocessing of reactive nanocompositesVSAvoidchemical and physical interaction between components

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The protein cage acts as an intermediary structure between the metal nanoparticle fuel and the oxidizer molecules. The protein cage provides specific binding sites that mediate the attachment of oxidizer-containing cages to metal particle surfaces, ensuring reliable chemical interaction while protecting the sensitive reactive components during handling and processing.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite structure where protein cages (containing oxidizer) are combined with metal nanoparticles (fuel). This composite architecture provides both chemical stability during storage and reactive interaction during combustion, as the protein cages protect the oxidizer while enabling controlled interaction with the metal particles.

Inventive Principle:

Principle #40Composite materials

3Use of energy by moving object

If sensitively reactive components are used in nanomaterial-based energetic formulations, then high energy density is achieved, but decomposition and instability occur during handling and processing

Engineering Contradiction:

Improveenergy density of reactive nanocompositesVSAvoidstability of reactive components

Core Design Contradiction:

Use of energy by moving objectVSStability of the object's composition

Solution Approach 1:

The protein cage acts as a flexible shell that encapsulates the oxidizer molecules. This protein shell provides mechanical protection and chemical stability to the sensitive oxidizer components during handling and processing, while allowing the nanocomposite to maintain its high energy density. The shell structure can be engineered with appropriate thickness and composition to balance protection with reactivity.

Inventive Principle:

Principle #30Flexible shells and thin films

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 results in reactive nanocomposites with improved exothermic behavior and increased energy output, achieving stoichiometrically balanced reactions and enhanced energetic performance compared to conventional nanothermite mixtures.

Implementation Method 1

assembling the loaded positively-charged protein cages onto an outer surface of metal nanoparticles

Methodology Applied

Scientific EffectElectrostatic attraction: Electrostatics

Implementation Method 2

loading positively-charged protein cages with one or more types of oxidizer to form loaded positively-charged protein cages, with the oxidizer being loaded into the pores of the positively-charged protein cages

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS9758439B1Reactive nanocomposites and methods of making the same

Publication Date: 2017.09.12 THE GOVERNMENT OF THE UNITED STATES AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE

AI summary

Reactive nanocomposites comprising a metal nanoparticle functionalized with one or more layers of self-assembled protein cages and methods of making the same. The reactive nanocomposites according to the present invention demonstrate improved reaction kinetics and enhanced exothermic behavior.