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Kumamoto University New Technology Presentation Meetings (October 30)


Kumamoto University New Technology Presentation Meetings
Surface of various substrates is finely patterned by mechanical modification

October 30, 2018, “Kumamoto University New Technology Presentation Meetings” was held in JST. In this here, an oral presentation by Dr. Nakanishi is picked up.


Figure 1. Process flow1)
In this R&D, the research group has developed a combined manufacturing process, which is composed of micro 3D masking technology and micro slurry jet technology, in order to form various functions on surface of general substrates directly.

As figure 1, first of all, a masking pattern is directly formed on light curing resin mask by the conventional processes, such as the 3D printing method, the photo etching method. The next, modification surface is mechanically patterned by the slurry jet method using slurry with Al2O3 abrasive compound. In this time, mask and base substrate are dry-etched at the same time. As a result, if mask is eliminated, a desired asperity pattern is formed on the base substrate. It's not chemical modification, so that, it's unnecessary to use medicinal solutions, such as photoresist, etchant, and its remove process. In short, this process is combination of the conventional methods.

Its main application is bio-inspired surface. In short, new functions is gained by fine surface structure, which is likely to leaf of lotus, eye of moth, and so on. For example, if above slurry treatment is done without pattern modification, contact angle of water changes from 20° to 60°approximately. Shortly, hydrophobic effect is realized, as a result, fingerprint and pollution become to be difficult to adhere to the surface.

Picture 1 shows surface treatment of the ceramic substrate. After this treatment, surface roughness was decreased, as a result, mechanical strength is increased. And also, if a mold for resin is treated by this process, residual dross of resin can be minimized due to enhancement of antifouling property. In short, fabrication precision and lifetime will be expected to be enhanced. Picture 2 shows modified glass with dot pattern, is likely to leaf of lotus.

Reference
1)Nakanishi：Surface patterning technology to be possible to correspond to various materials, large substrates, and 3D curved plates, Kumamoto University New Technology Presentation Meetings!, pp.3-6 (2018.10)
※This title is translated arbitrarily by Stella News Site because of without English edition of presentation material.


Figure 2. Comparison of surface state of ceramics substrate1)
Figure 3. Result of surface patterning fabrication1)



REMARK
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Stella's repair system“Repair Vision” is suitable for repair use of electrode and so on. Also, it's possible to directly pattern ITO, metal, CNT (Carbon Nano Tube) films by use of this system, too.