High-charge Polymeric Particles for Ordered Crystalline Arrays
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Solution Overview
Problem
Existing methods for producing radiation diffractive materials with crystalline colloidal arrays require high concentrations of ionic monomers to achieve sufficient charge density, leading to inefficient use and limited alignment of particles in ordered periodic arrays.
Innovation Solution
The use of ionic monomers with high affinity for polymeric particles, such as sodium styrene sulfonate, in emulsion polymerization to produce monodispersed particles with at least 50% of the ionic monomer binding to the particles, allowing for improved self-alignment and increased charge density in the arrays, reducing the overall amount of monomer needed and enhancing the integrity of the arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high concentrations of ionic monomers are used to achieve sufficient charge density, then the charge density of particles is improved, but the efficiency of monomer usage deteriorates and particle alignment is limited
Solution Approach 1:
The patent changes the chemical parameters of the ionic monomer selection, specifically choosing monomers with high affinity for polymeric particles (at least 50% binding). This parameter change allows achieving sufficient charge density with lower monomer concentrations, thereby improving efficiency while maintaining particle alignment capabilities
Solution Approach 2:
The patent uses ionic monomers that bind to polymeric particles to create charged surfaces. The ionic monomer acts as a copy or surrogate that transfers charge to the particle surface, enabling charge density achievement without requiring high concentrations of free ionic monomer in the dispersion
2Quantity of substance
If high concentrations of ionic monomers are used to achieve sufficient charge density, then the charge density of particles is improved, but the overall amount of monomer needed increases
Solution Approach 1:
The patent changes the binding affinity parameter of the ionic monomer to at least 50%, which fundamentally alters the monomer utilization efficiency. This parameter change ensures that monomers are retained on particle surfaces rather than remaining in solution, reducing total monomer consumption while maintaining effective charge density
Solution Approach 2:
The ionic monomer with high binding affinity serves itself by automatically binding to polymeric particles during emulsion polymerization. This self-service mechanism eliminates the need for external addition of excess monomer to achieve charge density, as the monomer self-organizes onto particle surfaces efficiently
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 improved alignment and robustness of particles in ordered periodic arrays, enabling more efficient radiation diffraction with less total ionic monomer usage, as demonstrated by higher binding efficiencies and enhanced diffraction properties compared to previous methods.
Implementation Method 1
The particles self-assemble into a CCA due to their electrostatic charges
Implementation Method 2
The presence of a similar charge on the particles causes the particles to repel each other and remain monodispersed and also causes the particles to self-align into an ordered periodic array
Implementation Method 3
These ordered structures diffract radiation according to Bragg's law, wherein the radiation meeting the Bragg conditions are reflected, while adjacent spectral regions that do not meet the Bragg conditions are transmitted through the device
Data Source
AI summary
A method of preparing a dispersion of polymeric particles is disclosed. Monomers are emulsion polymerized in the presence of an ionic monomer to produce highly charged polymeric particles. At least 50% of the ionic monomer in the dispersion is bound to the polymeric particles.