Semiconducting Polymer Dots for Liquid Authentication
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Solution Overview
Problem
Existing methods for authenticating the genuineness of liquids, particularly fuels, are inadequate as they rely on visible markers that can be easily reproduced and require sophisticated equipment for verification, making them impractical for on-site authentication and vulnerable to counterfeiting.
Innovation Solution
A method using semiconducting polymer particles (pdots) that form fluorescence or phosphorescence upon irradiation, which can be detected in small quantities without complex equipment, utilizing a lab-on-chip device for concentration and analysis, allowing for portable and efficient verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If visible markers such as dyes are added to liquids for authentication, then the liquid can be visually identified as genuine, but the marker can be easily reproduced by forgers and requires sophisticated equipment for precise verification
Solution Approach 1:
The patent uses fluorescent markers that emit light at specific wavelengths when excited, creating a unique optical signature that is difficult to reproduce. This transforms the simple color identification into a sophisticated optical detection that can be performed with portable fluorescence spectroscopy devices, resolving the contradiction between reliable authentication and equipment complexity
Solution Approach 2:
The patent changes the detection parameter from visible color to fluorescence emission wavelength, which provides unique identification characteristics. This allows for reliable authentication using fluorescence spectroscopy that can be performed with portable equipment, avoiding the need for complex laboratory analysis while preventing forgery
2Quantity of substance
If a marker is added to liquid in small quantities for efficient marking, then the authentication becomes cost-effective, but the marker concentration is difficult to detect without sophisticated equipment
Solution Approach 1:
The fluorescent marker provides strong optical signals even at low concentrations (e.g., 1-10 ppm), enabling detection with portable fluorescence spectroscopy devices. The fluorescence emission intensity and wavelength serve as reliable indicators of marker presence and concentration, resolving the detection difficulty while maintaining efficient small-quantity marking
Solution Approach 2:
The patent replaces complex mechanical or chemical analysis equipment with optical detection methods. Fluorescence spectroscopy provides a non-invasive, sensitive method to detect and quantify the marker at low concentrations using portable devices, eliminating the need for sophisticated laboratory equipment
3Ease of operation
If visual inspection by naked eye is used for marker detection, then the authentication can be performed on the spot, but the inspection is limited to mere color impression that can be easily forged
Solution Approach 1:
The patent uses fluorescence emission wavelengths as the authentication characteristic, which appear as specific colored light emissions when the marker is excited. Portable fluorescence spectroscopy devices can detect these unique wavelength signatures on-site, providing both the convenience of immediate authentication and the reliability of precise spectral analysis that is difficult to forge
Solution Approach 2:
The patent introduces a portable fluorescence spectroscopy device as an intermediary between visual inspection and laboratory analysis. This device enables on-site authentication with reliable spectral detection, bridging the gap between simple visual inspection and complex laboratory analysis while maintaining both convenience and reliability
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
Enables reliable and rapid authentication of liquid genuineness, even in small quantities, using a portable device that concentrates and analyzes pdots, providing unique identification characteristics difficult to counterfeit.
Implementation Method 1
semiconducting polymer particles (pdots) have been the subject of research, as they are interesting as nanoprobes due to their non-toxicity, bright photoluminescence, high photostability and fast emission rates
Implementation Method 2
The formation of semiconducting polymer particles (pdots), in particular those showing fluorescence and/or phosphorescence
Data Source
AI summary
The present invention relates to markers for liquids that can be used to authenticate the origin and genuineness of a liquid, preferably a bulk liquid such as fuel. For this purpose, the present invention teaches the use of a polymer capable of forming a semiconducting polymer particle (pdot) in the liquid in small amounts. The invention encompasses a liquid comprising a) a polymer that is capable of forming a semiconducting polymer particle (pdot), the concentration of the polymer being 10 ppm by weight or less, and b) an organic substance in an amount of 90% by weight or more. The invention furthermore envisages the use of such a polymer as an authenticating marker in a liquid, preferably a fuel, and a method for authenticating the genuineness and/or origin of a liquid comprising a polymer capable of forming a semiconducting polymer particle (pdot), comprising the stepsi. concentrating, isolating and/or extracting the polymer capable of forming a semiconducting polymer particle (pdot);ii. aggregating the polymer or the polymer obtained in Step i. to form semiconducting polymer dots (pdots);iii. irradiating the formed pdots with electromagnetic radiation capable of exciting the pdots to emit electromagnetic radiation by fluorescence and/or phosphorescence, andiv. observing the electromagnetic radiation emitted in response to the exciting irradiation of step iii.