scholarly journals Photochemical Micro-/Nano-Swelling of Silicone Rubber Induced by Long Pulse-Repetition Interval of an ArF Excimer Laser

2021 ◽  
Vol 2 (2) ◽  
pp. 116-124
Author(s):  
Masayuki Okoshi
Keyword(s):  
Excimer Laser ◽  
Silicone Rubber ◽  
Early Stage ◽  
Pulse Number ◽  
Pulse Repetition ◽  
Atomic Force ◽  
Arf Excimer Laser ◽  
Repetition Interval ◽  
193 Nm ◽  
Long Pulse

Long pulse-repetition intervals of 100 to 500 ms of a 193 nm ArF excimer laser successfully increased the height of the photochemical micro-/nano-swelling of silicone rubber, observed with a scanning electron microscope. The effect of the interval was seen despite the heating of the silicone rubber to 80 °C during laser irradiation. The height of the micro-/nano-swelling was saturated when the laser pulse number was 300 or greater, although each of the saturated heights of the micro-/nano-swelling formed by several pulse-repetition intervals was different. Thus, a second ArF excimer laser irradiated the growing micro-/nano-swelling before the saturation; the saturated height of the growing micro-/nano-swelling could be controlled by the pulse-repetition interval of the second ArF excimer laser. To examine the process of micro-/nano-swelling, an early stage of the growth was observed using an atomic force microscope; a dent structure of the micro-/nano-swelling was clearly recognized. In addition, a needle-like structure of the micro-/nano-swelling could be formed when silica glass microspheres were sparsely aligned.

scholarly journals Fabrication of Superhydrophobic Silicone Rubber with Periodic Micro/Nano-Suction Cup Structure by ArF Excimer Laser-Induced Photodissociation

Nanomaterials ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 870 ◽  
Author(s):  
Masayuki Okoshi
Keyword(s):  
Excimer Laser ◽  
Silicone Rubber ◽  
Focal Point ◽  
Pulse Number ◽  
Entire Surface ◽  
Suction Cup ◽  
Atomic Force ◽  
Superhydrophobic Property ◽  
Arf Excimer Laser ◽  
193 Nm

A 193-nm ArF excimer laser was used to induce the photodissociation of Si–O bonds of silicone rubber in order to fabricate a periodic micro/nano-suction cup silicone structure, approximately 1 μm in diameter and 2 μm in height at regular intervals of 2.5 μm. The laser was focused on Al-coated silicone rubber by each silica glass microsphere 2.5 μm in diameter, which covered the entire surface of the silicone rubber. The silicone rubber underneath each microsphere photochemically swelled after laser-ablating the coated Al to limit the diameter of the swelling. Simultaneously, the coated Al was able to adjust the focal point to the surface of the silicone rubber to form a hole approximately 500 nm in diameter, centered at the swollen silicone. The dependences of the thickness of the coated-Al and the laser pulse number are discussed, based on the observations of a scanning electron microscope (SEM) and an atomic force microscope (AFM). The superhydrophobic property of the fabricated micro/nano-suction cup structure was successfully found.

White-Light Emission from Silicone Rubber Modified by 193 nm ArF Excimer Laser

2007 ◽  
Vol 46 (No. 15) ◽  
pp. L356-L358 ◽  
Author(s):  
Masayuki Okoshi ◽  
Daisuke Sekine ◽  
Narumi Inoue ◽  
Tsugito Yamashita
Keyword(s):  
Excimer Laser ◽  
White Light ◽  
Silicone Rubber ◽  
Light Emission ◽  
White Light Emission ◽  
Arf Excimer Laser ◽  
193 Nm

Ultrahigh-repetition-rate ArF excimer laser with long pulse duration for 193-nm lithography

2001 ◽  
Author(s):  
Kouji Kakizaki ◽  
Takashi Matsunaga ◽  
Yoichi Sasaki ◽  
Toyoharu Inoue ◽  
Satoshi Tanaka ◽  
...  
Keyword(s):  
Pulse Duration ◽  
Excimer Laser ◽  
Repetition Rate ◽  
Arf Excimer Laser ◽  
193 Nm ◽  
Long Pulse

scholarly journals Effects of Non-thermal Ultrasound on a Fibroblast Monolayer Culture: Influence of Pulse Number and Pulse Repetition Frequency

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5040
Author(s):  
Silvia Ronda Peñacoba ◽  
Mar Fernández Gutiérrez ◽  
Julio San Román del Barrio ◽  
Francisco Montero de Espinosa
Keyword(s):  
Short Pulse ◽  
Pulse Repetition Frequency ◽  
Pulse Number ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Treatment Protocols ◽  
Culture Plate ◽  
New Treatment ◽  
Long Pulse

Despite the use of therapeutic ultrasound in the treatment of soft tissue pathologies, there remains some controversy regarding its efficacy. In order to develop new treatment protocols, it is a common practice to carry out in vitro studies in cell cultures before conducting animal tests. The lack of reproducibility of the experimental results observed in the literature concerning in vitro experiments motivated us to establish a methodology for characterizing the acoustic field in culture plate wells. In this work, such acoustic fields are fully characterized in a real experimental configuration, with the transducer being placed in contact with the surface of a standard 12-well culture plate. To study the non-thermal effects of ultrasound on fibroblasts, two different treatment protocols are proposed: long pulse (200 cycles) signals, which give rise to a standing wave in the well with the presence of cavitation (ISPTP max = 19.25 W/cm2), and a short pulse (five cycles) of high acoustic pressure, which produces a number of echoes in the cavity (ISPTP = 33.1 W/cm2, with Pmax = 1.01 MPa). The influence of the acoustic intensity, the number of pulses, and the pulse repetition frequency was studied. We further analyzed the correlation of these acoustic parameters with cell viability, population, occupied surface, and cell morphology. Lytic effects when cavitation was present, as well as mechanotransduction reactions, were observed.

scholarly journals 193-nm deep-UV lithography system using a line-narrowed ArF excimer laser

1993 ◽  
Author(s):  
Bruce W. Smith ◽  
Malcolm C. Gower ◽  
Mark Westcott ◽  
Lynn F. Fuller
Keyword(s):  
Excimer Laser ◽  
Uv Lithography ◽  
Arf Excimer Laser ◽  
Deep Uv ◽  
193 Nm ◽  
Lithography System
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