Flow-Type Field-Flow Fractionation Apparatus Temperature Control
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Solution Overview
Problem
Conventional flow-type field-flow fractionation apparatuses suffer from low reproducibility due to temperature fluctuations affecting the viscosity of the fluid, leading to significant changes in peak retention times during analysis.
Innovation Solution
Incorporating a separation cell with a pump and heater system that maintains the carrier and focus fluids at a constant temperature, either through direct heating by heaters or by housing the separation cell within an oven, to stabilize the fluid temperature and improve analysis reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature control is not implemented in the separation cell, then the apparatus structure remains simple, but the viscosity of the fluid changes with temperature causing significant deviations in peak retention times and low reproducibility
Solution Approach 1:
The patent implements temperature control by changing the thermal parameter of the fluid in the separation cell. A heater is installed to maintain the fluid at a constant temperature, which stabilizes the viscosity and ensures reproducible peak retention times. This directly addresses the contradiction by modifying the physical parameter (temperature) to improve reliability without significantly complicating the overall apparatus structure.
2Reliability
If a heater is added to control fluid temperature, then the temperature stability and analysis reproducibility improve, but the device complexity and energy consumption increase
Solution Approach 1:
The heater is designed to automatically maintain the fluid temperature at a set point, with the system self-regulating based on temperature sensors. This self-service approach ensures temperature stability and improves reliability while minimizing continuous energy consumption by only heating when necessary to maintain the set temperature, rather than requiring excessive energy input.
3Reliability
If the separation cell is housed in an oven for temperature control, then the temperature uniformity improves, but the device complexity and cost increase
Solution Approach 1:
Instead of heating the entire separation cell uniformly (which would require a complex oven structure), the patent segments the heating approach by installing a localized heater within the separation cell. This targeted heating approach achieves temperature uniformity in the critical fluid region while avoiding the complexity and cost of a full oven housing system.
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 stabilization of fluid temperatures within the separation cell enhances the reproducibility of analysis by minimizing the impact of temperature changes on fluid viscosity and flow rate distributions, resulting in consistent detection results.
Implementation Method 1
at least one heater that heats the carrier fluid and the focus fluid between the at least one pump and the separation cell
Implementation Method 2
at least one pump that sends the carrier fluid and the focus fluid to the separation cell
Implementation Method 3
a semipermeable membrane that allows the carrier fluid to pass through and does not allow fine particles to pass through
Implementation Method 4
a distribution of fine particles according to a particle size occurs due to a diffusion of fine particles and a force of the cross flow
Implementation Method 5
While a part of the fluid flows out of the separation cell as a cross flow, the fine particles are separated inside the separation cell
Data Source
AI summary
A flow-type field-flow fractionation apparatus 1 includes a first heater 14 and a second heater 16. The first heater 14 heats a carrier fluid between a first pump 12 and a separation cell 3. The second heater 16 heats a focus fluid between a second pump 15 and the separation cell 3. Thus, the carrier fluid heated by the first heater 14 is sent by the first pump 12 and flows into the separation cell 3, and the focus fluid heated by the second heater 16 is sent by the second pump 15 and flows into the separation cell 3. This can stabilize temperatures of the carrier fluid and the focus fluid flowing into the separation cell 3. Then, when an analysis is performed using the flow-type field-flow fractionation apparatus 1, the analysis can be performed with high reproducibility.