scholarly journals Femtosecond Laser Formed Periodic Nanostructures on PET Film Surface for Controlling Cell Spreading

2015 ◽  
Vol 43 (11) ◽  
pp. 772
Author(s):  
Yuji SATO ◽  
Masahiro TSUKAMOTO ◽  
Togo SHINONAGA ◽  
Kazuyuki HARA ◽  
Takuya KAWA ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Film Surface ◽  
Cell Spreading ◽  
Periodic Nanostructures ◽  
Pet Film

Biocompatibility of Titanium Dioxide Film Modified by Femtosecond Laser Irradiation

2014 ◽  
Vol 783-786 ◽  
pp. 1377-1382 ◽  
Author(s):  
Masahiro Tsukamoto ◽  
Togo Shinonaga ◽  
Akiko Nagai ◽  
Kimihiro Yamashita ◽  
Takao Hanawa ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Femtosecond Laser ◽  
Laser Irradiation ◽  
Film Surface ◽  
Polarization Vector ◽  
Cell Spreading ◽  
Laser Wavelength ◽  
Femtosecond Laser Irradiation ◽  
Periodic Nanostructures ◽  
Cell Test

Titanium (Ti) is one of the most widely used for biomaterials, because of its excellent anti-corrosion and high mechanical properties. In addion to these properies, the bioactivity of Ti is required. Recently, coating of the titanium dioxide (TiO2) film on Ti plate surface is useful methods to obtain biocompatibility of Ti plate. If periodic nanostructures were formed on the film surface, direction of cell spreading might be controlled due to grooves direction. Then, femtosecond laser is one of the useful tools of periodic nanostructures formation. Peiriod of periodic nanostructures might be varied by changing the laser wavelength. In the experiments, the film was formed on Ti plate with an aerosol beam which was composed of submicron size TiO2 particles and helium gas. The film was irradiated with the femtosecond laser. Laser wavelengths of the laser was at 1044, 775 and 388 nm, respectively. Periodic nanostructures, lying perpendicular to the laser electric field polarization vector, were formed on the film by femtosecond laser irradiation at 1044, 775 and 388 nm, respectively. The period of the periodic nanostructures on the film produced by femtosecond laser irradiation at 1044, 775 and 388 nm was about 350, 230 and 130 nm, respectively. In the cell test, cell spreading along the grooves of the periodic nanostructures was observed although it was not done for the film without the periodic nanostructures. These results suggested that direction of cell spreading could be controlled by the periodic nanostructures formation

Formation of periodic nanostructures using a femtosecond laser to control cell spreading on titanium

2015 ◽  
Vol 119 (3) ◽  
pp. 493-496 ◽  
Author(s):  
T. Shinonaga ◽  
M. Tsukamoto ◽  
T. Kawa ◽  
P. Chen ◽  
A. Nagai ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Control Cell ◽  
Cell Spreading ◽  
Periodic Nanostructures

Effect of periodic nanostructures formed with femtosecond laser on cell spreading

2014 ◽  
Author(s):  
Togo Shinonaga ◽  
Masahiro Tsukamoto ◽  
Kazuya Miyagawa ◽  
Kazuyuki Hara ◽  
Takuya Kawa ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Cell Spreading ◽  
Periodic Nanostructures

Fabrication of Anisotropic Structures on the Surface of Amorphous Silicon by Femtosecond Laser Pulses

2020 ◽  
Vol 312 ◽  
pp. 192-199
Author(s):  
Dmitrii V. Shuleiko ◽  
Mikhail N. Martyshov ◽  
Danila V. Orlov ◽  
Denis E. Presnov ◽  
Stanislav V. Zabotnov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Femtosecond Laser ◽  
Volume Fraction ◽  
Film Surface ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Surface Structures ◽  
Radiation Polarization ◽  
Direction Parallel ◽  
Nanocrystalline Si

Anisotropic periodic relief in form of ripples was formed on surface of amorphous hydrogenated silicon (a-Si:H) films by femtosecond laser pulses with the wavelength of 1.25 μm. The orientation of the surface structures relative to laser radiation polarization vector depended on the number of laser pulses N acting on the film surface. When N = 30, the structures with 0.88 μm period were formed orthogonal to the laser radiation polarization; at N = 750 the surface structures had period of 1.12 μm and direction parallel to the polarization. The conductivity of the laser-modified a-Si:H films increased by 3 to 4 orders of magnitude, up to 3.8·10–5 (Ω∙cm)–1, due to formation of nanocrystalline Si phase with a volume fraction from 17 to 30%. Anisotropy of the dark conductivity, as well as anisotropy of the photoconductivity spectral dependences was observed in the modified films due to depolarizing influence of periodic microscale relief and uneven distribution of nanocrystalline Si phase within such laser-induced structure.

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