Disposable PDMS Capillary Viscometer for On-Field Oil Quality Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional viscosimeters are expensive, complex, and not suitable for on-field monitoring of oil quality due to their large size and requirement for milliliter-sized samples, making them unsuitable for industrial or restaurant settings, and existing microfluidic solutions face challenges in accurately measuring high viscosity oils and are prone to cross-contamination.
Innovation Solution
A portable, disposable capillary viscosimeter using a PDMS microchannel with an oleophobic coating, interfaced with an optical microscope, measures dynamic viscosity by analyzing capillary dynamics and surface interactions, allowing for real-time measurement of oil quality without external power or reference samples, and can separate mixtures based on viscosity differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional rheometric apparatuses are used to measure viscosity, then measurement precision is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent replaces complex mechanical rheometric systems with a simplified capillary-based system. Instead of using torsional motors and torque transducers, the invention uses capillary flow through microchannels where viscosity is determined by measuring flow rate under controlled pressure, eliminating the need for complex mechanical measurement components while maintaining measurement capability
Solution Approach 2:
The patent creates a simplified copy of the viscosity measurement function using capillary flow principles rather than replicating full rheometric apparatus. The microchannel system copies the essential measurement function by relating flow rate to viscosity through capillary pressure, providing adequate precision for on-field applications without requiring complete mechanical systems
2Measurement precision
If traditional viscosimeters are used, then measurement accuracy is improved, but portability and ease of operation deteriorate
Solution Approach 1:
The patent segments the viscosity measurement function into a portable microfluidic device that can be operated independently in the field. The microchannel array and capillary system are miniaturized into a handheld device, separating the measurement function from laboratory infrastructure while maintaining sufficient accuracy for on-field quality control applications
Solution Approach 2:
The device enables operators to perform viscosity measurements independently without requiring laboratory equipment or expert operation. The simplified capillary flow system with visual or electronic detection allows any trained operator to conduct measurements in the field, making the system self-sufficient and eliminating dependence on complex laboratory apparatus
3Volume of moving object
If microfluidic systems are used for viscosity measurement, then device size is reduced, but ability to measure high viscosity oils deteriorates
Solution Approach 1:
The patent adjusts key parameters of the microfluidic system including channel dimensions, pressure differential, and measurement time scale to enable measurement of high viscosity oils. By optimizing these parameters, the device maintains miniaturization while extending its measurement range to accommodate viscous cooking oils and other high-viscosity fluids through controlled capillary flow
4Reliability
If disposable microfluidic devices are used, then cross-contamination is reduced, but manufacturing cost increases
Solution Approach 1:
The patent implements disposable microfluidic devices that are inexpensive enough to be single-use while providing reliable cross-contamination prevention. The microchannel arrays are manufactured using cost-effective techniques such as soft lithography or injection molding, making the devices economically viable as disposable items that eliminate cross-contamination risks between samples
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 device provides accurate, cost-effective, and precise measurement of dynamic viscosity with high precision, enabling on-field monitoring of oil quality and separation of oil mixtures, reducing cross-contamination risks and operational costs compared to traditional systems.
Implementation Method 1
a PDMS microchannel internally coated with an oleophobic coating reducing the oil absorption during the measurement
Implementation Method 2
measures dynamic viscosity by analyzing capillary dynamics and surface interactions
Data Source
Figure 1a~2b
Figure 3a~3b
Figure 3c
AI summary
The present invention relates to a cost-efficient, portable and disposable device for monitoring the quality of the oil "on field" and represents a valuable alternative to expensive and less quick traditional systems. We believe that the herein described viscosimeter can be useful for monitoring the quality of cooking oils used in restaurants and public places wherein frying oils are repeatedly used, or when it is necessary to check and validate the oil excellence following the suspected addition of lower quality oils. In addition to the food sector, the invention can be applied in industrial plants for monitoring viscosity variations following chemical/physical treatments (as for instance for assessing the efficiency of regeneration processes).