Compartmentalized Field Flow Fractionation for Particle Separation
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Solution Overview
Problem
Existing field flow fractionation techniques lack the ability to vary local flow conditions within the channel, leading to inefficient separation of particles across a wide size range, with smaller particles becoming diluted and larger particles trailing behind, making it difficult to achieve optimal fractionation for diverse particle sizes.
Innovation Solution
A compartmentalized field flow fractionation system with a segmented frit structure allows for programmable cross flows at different regions of the channel, enabling selective control of particle movement and reconcentration of separated peaks, enhancing the separation of complex particle distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cross flow rate is increased to improve separation of all species, then the separation continues but larger fractions trail further behind and smaller particles become diluted and broadened
Solution Approach 1:
The frit is divided into multiple compartments (first, second, and third compartments) along the channel length, each capable of independent cross-flow control. This segmentation allows different regions to operate at different cross-flow rates, preventing dilution of smaller particles while maintaining separation precision for larger particles.
Solution Approach 2:
Different compartments are assigned different cross-flow rates based on local separation needs. The first compartment operates at a higher cross-flow rate for initial separation, while subsequent compartments operate at lower rates to maintain concentration and prevent broadening of particle peaks.
2Productivity
If the channel flow velocity is increased to reduce traversal time, then smaller particles complete separation faster but larger particles do not have sufficient time to separate
Solution Approach 1:
The channel is divided into multiple compartments that can be programmed with different flow velocities. This allows the system to optimize velocity profiles for different particle sizes and separation stages, ensuring both speed and completeness of separation.
Solution Approach 2:
The system employs programmable, time-dependent control of cross-flow rates in different compartments. This dynamic control allows the system to adapt flow conditions during the separation process, maintaining optimal separation efficiency throughout the channel.
3Ease of operation
If a single cross flow rate is applied throughout the entire channel, then the system is simple to operate but cannot achieve optimal fractionation for particles of very different sizes
Solution Approach 1:
The frit is segmented into multiple independently controlled compartments, enabling different cross-flow rates to be applied in different regions. This maintains operational simplicity through programmable control while achieving the versatility needed for fractionating particles across a wide size range.
4Manufacturing precision
If the cross flow rate is increased to separate larger particles, then larger fractions separate better but smaller particles have already completed traversal and are diluted
Solution Approach 1:
The channel is divided into compartments that can be programmed with different cross-flow rates and timing. This allows larger particles to receive higher cross-flow rates in later compartments for better separation, while smaller particles are processed more quickly in earlier compartments before they become diluted.
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 enables sharper, more concentrated peaks and improved separation of larger particles, allowing for the capture and removal of outlier populations, thereby restoring pharmaceuticals to a pristine state and facilitating the analysis of complex particle distributions.
Implementation Method 1
asymmetric flow FFF, or A4F
Implementation Method 2
an impressed field is achieved by introducing a secondary flow perpendicular to the sample borne fluid within the channel
Implementation Method 3
programmable cross flows at different regions of the channel
Data Source
AI summary
A field flow fractionator to separate particles contained within an injected sample aliquot is described. As required, said fractionator may be used to capture, for subsequent removal, specific predefined classes of such particles. Based upon the cross flow or asymmetric flow field flow fractionators, the fractionator disclosed contains means to vary the applied transverse flows at a plurality of locations along the length of its separating channel. A plurality of separated compartments, each lying below a distinct and corresponding membrane supporting permeable frit segment, are provided individual means to control the localized flow through the membrane section thereabove. A corresponding concentric compartment implementation achieves the same type of compartmentalized cross flow when integrated with a hollow fiber fractionator.