High-Throughput SPLITT Fractionation Cell for Polymer Particle Density
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Solution Overview
Problem
Existing methods for determining the density of spherical polymer particles in suspension, such as sediment field flow fractionation (SdFFF), suffer from low throughput and are not applicable when particle density is unknown, limiting their effectiveness in quality control materials for point-of-care medical diagnostic systems.
Innovation Solution
A modified Split Flow Thin (SPLITT) fractionation technique is used, where the density of carrier fluid is incrementally changed to achieve buoyancy matching with the particle density, allowing for accurate determination of particle density by measuring flow rates through outlets in a fractionation cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sediment field flow fractionation (SdFFF) technique is used to determine particle density, then measurement accuracy is improved, but throughput decreases
Solution Approach 1:
The patent modifies the SdFFF technique by changing the physical parameters of the system - specifically using a thinner fractionation cell and adjusting flow rates to optimize both measurement accuracy and throughput. The separation path is reduced to a fraction of the original thickness while maintaining separation resolution through controlled flow parameters.
Solution Approach 2:
The patent divides the particle population into different size fractions through the fractionation cell, allowing simultaneous analysis of multiple particle size ranges. This segmentation approach increases throughput by processing diverse particle populations in parallel rather than requiring sequential analysis.
2Measurement precision
If traditional fractionation methods are used, then particle density can be determined, but the method becomes complex and costly
Solution Approach 1:
The patent extracts and simplifies the essential function of particle density determination from the complex SdFFF apparatus. By using a simplified fractionation cell design and focusing on the core separation principle, the method removes unnecessary complexity while maintaining measurement capability.
Solution Approach 2:
The patent employs a simpler, more cost-effective fractionation cell design that can be easily manufactured and replaced if needed. The approach uses readily available materials and standard laboratory equipment rather than requiring complex, expensive specialized apparatus.
3Measurement precision
If polymer composition is used to estimate density, then density estimation is obtained, but fabrication process variations cause inaccurate results
Solution Approach 1:
The patent replaces the theoretical/computational approach of estimating density from polymer composition with an experimental/physical measurement approach. By actually measuring particle density through fractionation and buoyancy methods, the system directly determines density rather than calculating it from composition data, accounting for all fabrication variations.
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 method provides a cost-effective, easy-to-use, and highly accurate way to determine the density of spherical polymer particles, ensuring precise calibration and troubleshooting of medical diagnostic instruments.
Implementation Method 1
the density of carrier fluid is incrementally changed to achieve buoyancy matching with the particle density
Implementation Method 2
a modified Split Flow Thin (SPLITT) fractionation technique is used
Data Source
AI summary
A method for determining the density of particles includes passing a carrier fluid and particles through a fractionation cell at a predetermined rate, where the carrier fluid has a predetermined density, the fractionation cell has a housing including a first axial end and a second axial end and the fractionation cell defines an interior carrier fluid flow-through channel, and an upper fluid outlet and a lower fluid outlet positioned below the upper fluid outlet, passing the carrier fluid and the particles through the upper fluid outlet and the lower fluid outlet, measuring a first concentration of particles passing through the upper fluid outlet, measuring a second concentration of particles passing through the lower fluid outlet, and determining a density of the particles based at least in part on the first concentration and the second concentration of particles.