Zinc Oxide Coating Film Balancing Antiviral Activity and Transparency
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Solution Overview
Problem
Existing technologies have not effectively addressed the correlation between the surface structure of zinc oxide coating films and their antibacterial and antiviral activities, nor have they optimized transparency and film thickness for functional applications.
Innovation Solution
A zinc oxide coating film with a surface area increase ratio (Sdr) of 2.00% to 13.00% and a thickness of 50 nm to 1000 nm, applied using an organozinc compound, exhibits antibacterial and antiviral activities with a transmittance of 80.0% or more at 550 nm, formed by spray coating in an atmosphere with controlled humidity and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the zinc oxide coating film is increased to improve antibacterial and antiviral activities, then the antibacterial and antiviral efficacy is improved, but the transmittance decreases
Solution Approach 1:
The patent optimizes the thickness parameter of the zinc oxide coating film to a specific range (50-1000 nm) where the antibacterial and antiviral activities are sufficient while maintaining high transmittance (80.0% or more at 550 nm). This parameter optimization resolves the contradiction by finding the optimal thickness value that satisfies both requirements simultaneously.
2Reliability
If the surface area increase ratio (Sdr) is increased to improve antibacterial and antiviral activities, then the antibacterial and antiviral efficacy is improved, but the manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent specifies a controlled range for the surface area increase ratio (Sdr) of 2.00%-13.00%, which balances the need for high antibacterial and antiviral activities with the practical constraints of manufacturing precision. This parameter specification resolves the contradiction by defining an optimal range that achieves the desired functionality while remaining manufacturable.
3Reliability
If a thicker zinc oxide coating film is applied to ensure adequate antibacterial and antiviral protection, then the protective function is improved, but the transparency of the coating film deteriorates
Solution Approach 1:
The patent determines the optimal thickness range of 50-1000 nm for the zinc oxide coating film, which provides sufficient protective function (antibacterial and antiviral activities of 2.0 or more) while maintaining high transparency (transmittance of 80.0% or more at 550 nm). This parameter optimization resolves the contradiction between protection and transparency.
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 coating film achieves high antibacterial and antiviral efficacy against multiple bacteria and viruses, including a 99% reduction, while maintaining transparency and heat resistance, suitable for various substrates and applications.
Implementation Method 1
forming the zinc oxide coating film by applying a coating liquid containing an organozinc compound represented by formula (1) in an atmosphere in which water is present
Implementation Method 2
fine particles of zinc oxide have an ultraviolet shielding effect and are transparent to visible light
Data Source
AI summary
Provided is an article having a zinc oxide coating film on a substrate, in which a surface area increase ratio Sdr measured on the surface of the zinc oxide coating film is 2.00% or more and 13.00% or less, and an antibacterial activity value (in accordance with JIS Z 2801:2010) measured on the surface of the zinc oxide coating film is 2.0 or more.