Nanoporous Sol-Gel Ozone Filter with Indigo Carmine
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Solution Overview
Problem
Current ozone filters and sensors face challenges such as lack of specificity, inability to detect saturation, interference from air humidity, and release of toxic compounds, while existing ozone sensors are bulky and expensive, limiting their portability and reliability.
Innovation Solution
Development of nanoporous sol-gel matrices with tailored pore sizes and indigo carmine content, allowing for specific ozone trapping and visual monitoring of saturation through colorimetric reaction, while being resistant to UV radiation and humidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If activated carbon is used for ozone trapping, then ozone capture efficiency is improved, but trapping efficiency decreases significantly at high relative humidity levels due to competitive adsorption between water vapor molecules and ozone
Solution Approach 1:
The patent uses a porous polymer matrix with specifically controlled pore sizes (0.03-0.5 μm) that allows ozone molecules to enter and react with indigo carmine while being less susceptible to water vapor interference compared to traditional activated carbon. The porous structure provides high surface area for ozone trapping while the polymer material properties reduce humidity interference.
Solution Approach 2:
The patent creates a composite material system combining polymer matrix, indigo carmine dye, and controlled pore structures. This composite approach integrates the advantages of each component: the polymer provides structural stability and humidity resistance, indigo carmine provides specific ozone reaction capability, and the porous structure provides high surface area for trapping.
2Reliability
If activated carbon is used for ozone trapping, then ozone capture efficiency is improved, but it traps all sorts of volatile compounds and there is no way to control the saturation point, releasing harmful compounds
Solution Approach 1:
The patent applies local quality by using indigo carmine specifically located within the porous polymer matrix to target ozone molecules. This localized approach ensures that only ozone is trapped and reacted with, while other volatile compounds pass through unaffected. The specific chemical affinity of indigo carmine for ozone provides selectivity.
Solution Approach 2:
The patent employs a disposable filter design where the indigo carmine-impregnated porous matrix is replaced when saturated. This eliminates the problem of harmful compound release by ensuring the filter is discarded rather than regenerated, preventing any potential release of trapped compounds. The low cost allows for regular replacement.
3Measurement precision
If indigo is used in powder or thin film form on semiconductor-based sensors, then ozone detection specificity is improved, but the specific adsorption surfaces are too small for filter application
Solution Approach 1:
The patent uses a porous polymer matrix with controlled pore sizes and high surface area to dramatically increase the adsorption surface area available for indigo carmine. The porous structure provides numerous cavities and channels where indigo carmine can be distributed throughout the entire matrix volume, not just on the surface, thereby scaling up the effective surface area from sensor to filter application.
Solution Approach 2:
The patent transitions from two-dimensional thin film or powder forms of indigo to a three-dimensional porous matrix structure. This dimensional change allows indigo carmine to be distributed throughout the entire volume of the porous matrix, maximizing the effective surface area for ozone trapping while maintaining the specificity of the indigo-ozone reaction.
4Reliability
If catalytic systems are used for ozone destruction, then ozone removal efficiency is improved, but they must operate at high temperatures (200 to 400 °C) and are difficult to use continuously for months or even years
Solution Approach 1:
The patent replaces the thermal catalytic system with a chemical absorption system based on the specific reaction between indigo carmine and ozone. Instead of using high temperature to drive a catalytic reaction, the system uses the chemical affinity between indigo carmine and ozone at room temperature, eliminating the need for high temperature operation while maintaining effectiveness.
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 nanoporous sol-gel matrices effectively trap ozone, provide visual saturation alerts, and offer a cost-effective, portable solution for ozone detection, outperforming traditional filters and sensors in efficiency and durability.
Implementation Method 1
The nanoporous sol-gel matrices effectively trap ozone
Implementation Method 2
visual monitoring of saturation through colorimetric reaction
Data Source
Figure 1(A)~1(B)
Figure 2(A)~2(B)
Figure 3~4
AI summary
The invention relates to a nanoporous polyalkoxysilane sol-gel matrix and to a process for producing such a nanoporous polyalkoxysilane sol-gel matrix containing indigo carmine, wherein said process comprises the following steps: • a) synthesizing a gel from tetramethoxysilane or from a mixture of tetramethoxysilane and another organosilicon precursor chosen from phenyltrimethoxysilane, phenyltriethoxysilane, a fluoroalkyltrimethoxysilane, a fluoroalkyltriethoxysilane, a chloroalkylmethoxysilane, a chloroalkylethoxysilane, an aminopropyltriethoxysilane and mixtures thereof, the synthesis being carried out in an aqueous medium in the presence of a polar organic solvent and of the indigo carmine at a temperature ranging from 20 to 70°C, • b) drying the gel obtained in step a) so as to obtain a nanoporous polyalkoxysilane sol-gel matrix containing indigo carmine.