Fluorinated Sol-Gel Matrix for Hydrocarbon-Resistant Optical Sensors
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Solution Overview
Problem
Current optical sensors lack effective resistance to hydrocarbons, leading to degradation, leaching, and accelerated photo bleaching in environments with non-polar volatile hydrocarbons, which affects sensor stability and signal integrity.
Innovation Solution
A multicomponent sol-gel medium is developed by adding a fluorinated sol-gel precursor, such as (3,3,3-trifluoropropyl)triethoxysiloxane, to methyltrimethoxysilane, doping with tris-(4,7-diphenyl-1,10-phenanthroline)ruthenium (II) chloride, and coating on optical fibers, providing resistance to hydrocarbons through oleophobic properties and thermal/optical curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard sol-gel medium is used to immobilize indicator molecules, then the sensor can detect analytes, but the sensor degrades rapidly in hydrocarbon environments due to leaching and photo bleaching
Solution Approach 1:
The patent applies composite materials by combining fluorinated sol-gel precursor with methyltrimethoxysilane to create a multicomponent sol-gel medium. This composite material integrates the oleophobic properties of fluorinated compounds with the structural framework of sol-gel, resulting in a matrix that simultaneously provides indicator molecule immobilization and resistance to hydrocarbon degradation, thereby resolving the contradiction between sensor stability and hydrocarbon compatibility.
Solution Approach 2:
The patent employs parameter changes by modifying the chemical composition of the sol-gel medium through the addition of fluorinated precursors. This changes the surface energy and chemical resistance parameters of the matrix, transforming it from a hydrocarbon-permeable state to a hydrocarbon-resistant state while maintaining oxygen permeability and indicator molecule functionality, thus resolving the degradation issue in hydrocarbon environments.
2Reliability
If the sol-gel matrix is made more resistant to hydrocarbons, then sensor stability improves, but permeability to oxygen may be reduced
Solution Approach 1:
The patent applies local quality by creating a matrix with differentiated properties: the fluorinated sol-gel provides hydrocarbon resistance at the outer interface, while the sol-gel network structure maintains oxygen permeability in the bulk material. This spatial differentiation of material properties allows the sensor to simultaneously achieve hydrocarbon stability and oxygen transport functionality, resolving the contradiction between resistance and permeability.
Solution Approach 2:
The patent utilizes porous materials by maintaining the characteristic porous structure of sol-gel matrices. The porous network allows oxygen molecules to diffuse through the matrix while the fluorinated surface modification provides hydrocarbon resistance. This preserves oxygen permeability while achieving hydrocarbon stability, resolving the contradiction between these two requirements.
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 new sol-gel medium significantly enhances sensor stability by reducing leaching and photo bleaching, maintaining signal integrity in hydrocarbon environments, with improved resistance to fuel and non-polar hydrocarbons, as demonstrated by reduced intensity and lifetime decay in experiments.
Implementation Method 1
The fluorinated sol gel provides resistance toward hydrocarbons due to its oleophobic properties
Implementation Method 2
The sol-gel polymerizes, trapping the ruthenium compound in an oxygen permeable, hydrocarbon impermeable glass like solid
Implementation Method 3
a ruthenium organic compound, which is used to sense molecular oxygen... The fluorescence material is mixed with the sol-gel monomers
Implementation Method 4
The sol-gel polymerizes, trapping the ruthenium compound in an oxygen permeable, hydrocarbon impermeable glass like solid
Data Source
AI summary
This invention belongs to the field of optical chemical sensors. Specifically, it relates to sensors based on the absorbance and emission of light by an indicator molecule where the optical properties of the indicator molecule change in response to a particular analyte. These indicator molecules are immobilized in a transparent substance that is exposed to light, where the substance is typically a solid such as a sol-gel or a polymer. More specifically, it is a new process for manufacturing a material (a medium or matrix) to hold or encapsulate sensing molecules. This new material has an improved resistance to exposure to hydrocarbons. These materials are used to immobilize colorimetric and/or fluorescence indicators in a matrix that repels hydrocarbons in general and non-polar hydrocarbons (i.e. aromatics hydrocarbons) in particular.