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Wavelength Dependence of Photochemical Surface Modication of Silicone Rubber
Masayuki Okoshi,Minako Iyono,Narumi Inoue,Tsugito Yamashita 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.3
Photochemical surface modifications of silicone ([SiO(CH3)2]n) rubber have been successfully demonstrated by using various UV pulsed lasers; a 157-nm F2 laser and a 193-nm ArF and by using the 266-nm fourth harmonic of a Nd:YAG laser. The F2 laser modified silicone into transparent silica (SiO2). By switching the light source from a F2 laser to an ArF excimer laser or to the fourth harmonic of a Nd:YAG laser, we could modify the surface of the silicone rubber into a photoluminescent material or into amorphous carbon, respectively. Based on the photochemical modifications, micron-sized silica optical waveguides and white light sources could be integrated into a silicone rubber chip. Photochemical surface modifications of silicone ([SiO(CH3)2]n) rubber have been successfully demonstrated by using various UV pulsed lasers; a 157-nm F2 laser and a 193-nm ArF and by using the 266-nm fourth harmonic of a Nd:YAG laser. The F2 laser modified silicone into transparent silica (SiO2). By switching the light source from a F2 laser to an ArF excimer laser or to the fourth harmonic of a Nd:YAG laser, we could modify the surface of the silicone rubber into a photoluminescent material or into amorphous carbon, respectively. Based on the photochemical modifications, micron-sized silica optical waveguides and white light sources could be integrated into a silicone rubber chip.
Masayuki Okoshi,Tsuyoshi Yoshida 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.1
A silicone rubber-based biochip for disinfection under deep-UV light exposure was successfully fabricated by an ArF excimerlaser. To fabricate the biochip, periodic micro-swelling structure of silicone rubber was photochemically formed bythe ArF excimer laser-induced photodissociation of Si–O bonds of silicone rubber. It was found that the growth rate of themicro-swelling structure could be controlled by varying the laser pulse repetition rate; a slow growth of roughly 100 ms andlonger per laser pulse was recognized. In addition, no change of each the micro-swelling height formed at various laser pulserepetition rates was also found in the range of 300–18,000 of laser pulse number. Using such the wide processing window,moreover, the periodic micro-swelling structure could be modified into photoluminescent property by long irradiation ofArF excimer laser, while maintaining the micro-swelling height. Blue photoluminescence from the modified micro-swellingstructure was observed under a deep-UV light exposure. Thus, each the periodic micro-swelling structure with various desiredheights could be bonded to a flat plate of fused silica glass to have equal gaps. A small amount of solution could be confined in the equal gap to disinfect virus/bacteria in the solution under deep-UV light for analytical application.
Development of Cotton Candy Method for High Productivity Polypropylene Fibers Webs
Rutchaneekorn Wongpajan,Supaphorn Thumsorn,Hiroyuki Inoya,Masayuki Okoshi,Hiroyuki Hamada 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
The cotton candy method (CoCAM) is developed for high productivity of polymer micro- and nano-fibers. Polypropylene was molten in a single screw extruder of the CoCAM at air pressures of 0.2-0.5 MPa with nozzle temperatures of 280-350 ℃ and the constant air temperature of 600 ℃. The distance from the nozzle to the collector was set at 10-90 cm. Thermal images informed the accumulation of PP fibers flows at shorter collector distance. The diameters of PP micro-fibersdecreased with increasing the air pressures and the nozzle temperatures. Crystallinity of the PP micro-fibers increased when increasing the nozzle temperature due to higher occasion of molecular orientation. The degree of the fiber entanglement in the PP micro-fibers decreased when increasing the collector distance, which affected on the declination of tensile strength. Ductility of the PP micro-fibers improved at high collector distances. The optimum condition of the PP micro-fibers was found at the average diameter of 2.3 μm at 0.5 MPa with the nozzle temperature of 340 ℃ collected at 60 cm. The productivity of the PP micro-fibers webs from the CoCAM was 144 g/h.