In the standard “JIS R 1703-1 Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for self-cleaning performance of photocatalytic materials - Part 1: Measurement of water contact angle” developed by the Japanese Industrial Standards Organization (JIS), the measurement method using water contact angle is described among the test methods for self-cleaning performance of photocatalytic materials. In these methods, metal oxide semiconductors such as titanium dioxide are mainly used as photocatalysts.
-fotokatalitik-malzemelerin-kendi-kendini-temizleme-performansina-yonelik-test-yontemi-bolum-1.jpg "JIS R 1703-1 Fine Ceramics (Advanced Ceramics, Advanced Technical Ceramics) - Test Method for Self-Cleaning Performance of Photocatalytic Materials - Part 1: Measurement of Water Contact Angle")
This standard does not apply to the following types of materials.
The corresponding standard to this standard is “ISO 27448 Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for self-cleaning performance of semiconductor photocatalytic materials - Measurement of water contact angle” standard developed by the International Organization for Standardization (ISO).
When a photocatalytic material coated with oleic acid (an oily substance) is exposed to ultraviolet rays, the oleic acid decomposes and the surface is exposed, and the contact angle of water decreases due to the development of superhydrophilicity (compatibility with water). The measurement is continued until the contact angle reaches a constant value and its hydrophilicity is evaluated. It achieves self-cleaning performance in dirt caused by rainwater.
Briefly, the JIS R 1703-1 standard specifies the measurement method of water contact angle among the indexes affecting the self-cleaning performance of flat sheet photocatalytic materials.
The possibility of nano-photocatalysts in cementitious systems is promising, but their engineering application is still limited due to insufficient insights into their durability properties in service. Ceramics containing different binders and photocatalysts are prepared and characterized to investigate the mechanisms of deterioration of self-cleaning performance upon simultaneous hydration/carbonation. Changes in self-cleaning performance resulting from changes in microstructure, phase composition, and optical properties are analyzed. The decrease in self-cleaning performance is attributed to higher band energy with surface modification, stronger accommodation with increased solid volume, worse mass transfer with reduced gel porosity, and chemical equilibrium delay.
Composite photocatalysts and microsilica have been found to resist deterioration of self-cleaning performance upon hydration/carbonation by promoting mass transfer and chemical stability and limiting surface modification.
The contact angle is the angle between a liquid surface and a solid surface where they meet. More specifically, it is the angle between the surface tangent at the liquid-vapor interface and the tangent at the solid-liquid interface at the intersection.
At a given temperature and pressure, a given system of solid, liquid and vapor has a unique equilibrium contact angle. However, in practice, a dynamic contact angle phenomenon is often observed, ranging from the advancing contact angle to the retreating contact angle. The equilibrium contact angle reflects the relative strength of the molecular interaction of liquid, solid and vapor.
Among the numerous tests, measurements, analyses and evaluation studies that our organization has carried out for businesses in various sectors, our organization also provides testing services defined in the standard “JIS R 1703-1 Fine ceramics (advanced ceramics, advanced technical ceramics) - Test method for self-cleaning performance of photocatalytic materials - Part 1: Measurement of water contact angle” with its trained and expert staff and advanced technological equipment.
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