Carbon Nanoparticle Shear Thickening Fluid for Lightweight Shock Absorption
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Solution Overview
Problem
Conventional shear thickening fluids used for bullet-resistant materials face challenges in achieving improved shock absorption while maintaining lightweight properties, as increasing the particle filling rate leads to increased material weight and potential harm to the human body.
Innovation Solution
A shear thickening fluid comprising silica particles and carbon nanoparticles, such as graphene oxide nanoparticles, with a bimodal particle size distribution, is developed, where the carbon nanoparticles are added in a specific concentration to enhance viscosity and shock absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rate of filling of inorganic particles or the rate of impregnation of the shear thickening fluid is increased to improve bullet-resistant performance, then the shock absorption ability is improved, but the weight of the material is greatly increased
Solution Approach 1:
The patent combines inorganic silica particles with organic carbon nanoparticles to form a composite shear thickening fluid. This composite structure allows the material to achieve improved shock absorption performance while maintaining lower weight compared to conventional inorganic particle-only formulations, as the carbon nanoparticles enhance the shock absorption mechanism through their unique structural properties
Solution Approach 2:
The patent changes the particle size distribution parameter by using a bimodal distribution with specific size ranges (first particles: 0.5-5 μm, second particles: 5-20 μm). This parameter optimization enables the fluid to achieve maximum viscosity at lower particle concentrations, thereby improving shock absorption while reducing the overall particle filling rate and material weight
2Strength
If the rate of filling of inorganic particles is increased to improve bullet-resistant performance, then the viscosity increases, but the material weight increases making it difficult to provide lightweight materials
Solution Approach 1:
The patent creates a composite system combining inorganic silica particles with organic carbon nanoparticles. The carbon nanoparticles contribute to viscosity enhancement through their high aspect ratio and surface area, allowing the system to achieve target viscosity levels at lower overall particle concentrations, thus reducing material weight while maintaining protective performance
Solution Approach 2:
The patent optimizes particle size distribution parameters by implementing a bimodal distribution with specific size ranges. This parameter change allows for more efficient packing and interaction between particles, maximizing viscosity at lower filling rates and thereby reducing material weight
3Reliability
If the rate of impregnation of the shear thickening fluid in fibers is increased to improve bullet-resistant performance, then the shock absorption ability is improved, but a significant amount of shock will be applied to the human body
Solution Approach 1:
The composite structure of inorganic silica particles and organic carbon nanoparticles creates a more effective shock absorption mechanism. The carbon nanoparticles provide additional energy dissipation pathways through their unique structural properties, enabling the material to absorb shock more effectively at lower impregnation rates, thereby reducing harmful shock transmission to the human body
Solution Approach 2:
The patent optimizes particle size distribution parameters to maximize the shock absorption efficiency of the fluid. The bimodal distribution enables better particle packing and interaction, enhancing the fluid's ability to dissipate shock energy at lower concentrations, which reduces both the impregnation rate needed and the harmful shock transmitted to the wearer
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 fluid exhibits significantly improved viscosity and shock absorption capabilities compared to conventional silica particle-based fluids, as demonstrated by increased maximal viscosity and enhanced ball drop trauma depth and rebound height measurements.
Implementation Method 1
A shear thickening fluid (STF), a kind of non-Newtonian fluid, is a fluid such as a colloidal suspension which contains solid particles dispersed in a liquid dispersion medium and which reversibly changes from a liquid state to a solid state due to its rheological properties when the shear stress or shear rate thereof increases to rapidly increase the viscosity
Implementation Method 2
drying the stirred material under reduced pressure to remove water and other solvent
Data Source
AI summary
Disclosed are a shear thickening fluid (STF) comprising solid particles and a dispersion medium, wherein the solid particles comprise silica particles as a first component and carbon nanoparticles as a second component and a method for preparing a shear thickening fluid, comprising mixing silica particles, a dispersion medium for silica particles, and a carbon nanoparticle dispersion.