Carbon Nanofiber-Reinforced Polysiloxanes for Flexible Radiation Shielding
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Solution Overview
Problem
Existing materials for radiation shielding, particularly those containing boron, are brittle and unsuitable for structural applications due to their inherent brittleness, necessitating thick or thin parts that are not flexible and require high boron loadings.
Innovation Solution
A composite material comprising polysiloxane polymer, carbon nanofibers, and high weight percentages of elemental components like boron, copper, or bismuth, which are dispersed and cured to form a flexible and moldable material with improved mechanical properties and radiation shielding capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large loadings of boron are used to achieve desired shielding properties, then radiation shielding effectiveness is improved, but the material becomes extremely thick and low-density or very thin and high-density, resulting in brittleness and unsuitability for structural applications
Solution Approach 1:
The patent employs a composite material system consisting of polysiloxane polymer matrix, carbon nanofibers, and elemental boron. This composite approach allows the material to simultaneously achieve high radiation shielding effectiveness from boron (25-90 wt%) while maintaining structural flexibility and mechanical properties through the polysiloxane-carbon nanofiber matrix, eliminating the brittleness inherent in pure boron or high-boron conventional materials
Solution Approach 2:
The patent changes the physical and chemical parameters of the matrix material from conventional polymers to polysiloxane polymers with specific properties (flexibility, compliance, moldability). This parameter change enables the high-boron composite to maintain flexibility and structural integrity, resolving the contradiction between shielding effectiveness and material brittleness
2Ease of manufacture
If natural boron is used as a structural component, then material availability is improved, but inherent brittleness prevents structural application
Solution Approach 1:
The patent creates a composite where natural or enriched elemental boron (25-90 wt%) is dispersed within a polysiloxane polymer matrix reinforced with carbon nanofibers. This composite structure allows natural boron to be used while eliminating its inherent brittleness through the flexible polymer-nanofiber matrix, enabling structural applications that were previously impossible with pure boron
3Object-affected harmful factors
If high weight percentages of elemental shielding components are incorporated, then radiation shielding and neutron capture capabilities are improved, but material flexibility and moldability deteriorate
Solution Approach 1:
The patent utilizes polysiloxane polymers with specific physical and chemical parameters (flexibility, compliance, moldability) as the matrix material. This parameter selection enables the incorporation of high weight percentages (25-90 wt%) of elemental shielding components while maintaining material flexibility and moldability, as the polysiloxane matrix can accommodate high filler loads without becoming brittle or rigid
Solution Approach 2:
The composite material system with polysiloxane polymer, carbon nanofibers, and high concentrations of elemental shielding components (25-90 wt%) achieves both high radiation shielding capability and maintained flexibility/moldability through the synergistic combination of matrix and filler properties
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 composite material provides effective radiation shielding and neutron capture while maintaining flexibility and structural integrity, with high boron loadings and resistance to ionizing radiation, suitable for applications in nuclear power plants and space radiation protection.
Implementation Method 1
carbon nanofiber reinforced polysiloxanes
Implementation Method 2
the 10B (n, alpha) 7Li reaction
Implementation Method 3
radiation shielding or neutron capture are desired
Implementation Method 4
polysiloxane-based composite materials
Data Source
AI summary
Provided herein are polysiloxane-based composite materials comprising a high weight percentage of elemental components (e.g., elemental boron, elemental copper, elemental bismuth, elemental lead) and low levels of carbon nanofibers. The elemental components may be present in the composite materials at levels greater than 25% by weight. Also provided herein are methods of forming the composite materials that have desirable flexibility and shielding properties. The invention provides a versatile composite material that is compliant and moldable, while still comprising high levels of the elemental shielding components. The materials are particularly useful for applications in which radiation shielding or neutron capture are desired.