Quaternary Silane TiO2 Coating for Ambient-Cure Surface 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 for creating self-decontaminating surfaces.
Innovation Solution
A method using an electrostatic spray apparatus to deposit titanium dioxide particles at ambient temperature, combined with an organosilane comprising a quaternary ammonium moiety, to form a uniform and adherent self-decontaminating coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-temperature sintering is used to deposit titanium oxide on a substrate, then the titanium oxide is firmly supported on the substrate, but the process requires high temperatures (200-400 degrees Celsius) which limits its utility for consumer applications
Solution Approach 1:
The patent changes the chemical parameters of the deposition system by introducing a reactive mixture of quaternary silanes and titanium(IV) alkoxides that undergoes low-temperature polycondensation. This chemical transformation allows the coating to cure at ambient or near-ambient temperatures while still achieving firm adhesion to the substrate, thereby resolving the contradiction between reliable support and high temperature requirement
Solution Approach 2:
The patent uses quaternary silanes as intermediary compounds that react with titanium(IV) alkoxides to form a bridging network. These silane intermediaries enable low-temperature crosslinking and adhesion promotion, allowing the titanium oxide coating to achieve firm support without requiring high-temperature sintering
2Ease of manufacture
If high-temperature sintering is used to cure titanium oxide coating, then the coating is fixedly set on the substrate, but the process complexity and energy consumption increase
Solution Approach 1:
The patent transforms the curing process from a high-temperature physical sintering operation to a low-temperature chemical polycondensation reaction. By changing the temperature parameter and introducing reactive precursors, the coating can be fixedly set at ambient conditions, dramatically reducing energy consumption while simplifying the manufacturing process
Solution Approach 2:
The patent applies the titanium(IV) alkoxide and quaternary silane coating composition to the substrate beforehand, allowing the reactive mixture to be deposited and then cured in situ at low temperature. This preliminary deposition followed by low-temperature curing eliminates the need for high-temperature processing while achieving the same fixation result
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 effectively reduces microbial contamination on surfaces, demonstrating a significant reduction in bacterial load and maintaining effectiveness even after re-contamination, as shown in bus surface treatment studies.
Implementation Method 1
A method using an electrostatic spray apparatus to deposit titanium dioxide particles at ambient temperature
Implementation Method 2
combined with an organosilane comprising a quaternary ammonium moiety, to form a uniform and adherent self-decontaminating coating
Data Source
AI summary
A method to prepare a self-decontaminating surface, where that method includes disposing a first coating on a surface, where that first coating comprises an organosilane, and disposing a second coating over the first coating, where the second coating comprises TiO2.