Sol-Gel Titanium Dioxide Coating for Low-Temperature Self-Decontamination
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Solution Overview
Problem
Current methods for preparing titanium oxide sheets, coatings, or films require high-temperature sintering, limiting their utility in creating self-decontaminating surfaces due to the need for baking at 200-400 degrees Celsius.
Innovation Solution
A method using a titanium alkoxide starting material, such as titanium tetraisopropoxide, is employed to form a liquid coating composition that can be cast onto a surface, creating a photocatalytic titanium dioxide coating that generates electron-hole pairs upon UV exposure, effectively decontaminating surfaces at lower temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature sintering (200-400 degrees Celsius) is used to deposit titanium oxide on a substrate, then the titanium oxide coating is firmly supported on the substrate, but the process requires high energy consumption and limits utility for consumers and retailers
Solution Approach 1:
The patent changes the processing temperature parameter from high (200-400°C) to low (below 200°C) by using a sol-gel chemistry approach. Titanium alkoxide is hydrolyzed and condensed to form a titanium oxide coating that adheres firmly to the substrate without requiring high-temperature sintering, thus reducing energy consumption while maintaining coating reliability
Solution Approach 2:
The patent replaces the thermal field (high-temperature sintering) with a chemical field (sol-gel hydrolysis and condensation). The chemical reactions of titanium alkoxide with water to form titanium oxide gel and subsequent low-temperature drying provide sufficient adhesion without mechanical or thermal forcing, substituting a high-energy physical process with a low-energy chemical process
2Reliability
If high-temperature sintering is used to cure titanium oxide compound, then the coating is fixedly set on the substrate, but the process is complex and requires specialized equipment
Solution Approach 1:
The patent changes the curing temperature parameter from high (200-400°C) to low (below 200°C) through sol-gel chemistry. The hydrolysis and condensation of titanium alkoxide naturally proceed at low temperatures, and the resulting gel structure provides fixed setting without requiring complex high-temperature furnaces or specialized equipment
Solution Approach 2:
The patent introduces a sol-gel intermediary (titanium alkoxide solution) that mediates between the substrate and the final titanium oxide coating. This intermediary allows for low-temperature processing and simplified equipment requirements while still achieving firm adhesion and fixed setting of the coating
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 method enables the formation of a self-decontaminating surface capable of reducing microbial contaminants like MRSA and viruses by up to 5.6 log reductions within two hours, demonstrating effective disinfection without the need for high-temperature processing.
Implementation Method 1
a photocatalyst comprises a titanium oxide moiety... generates electron-hole pairs upon UV exposure, effectively decontaminating surfaces
Data Source
AI summary
A method to prepare a self-decontaminating surface, where that method includes dissolving tartaric acid in water, adding titanium (IV) isopropoxide to the tartaric acid solution to form a coating composition in water, and casting that coating composition onto a surface to form a coating having anti-microbial function.