scholarly journals Electron Irradiation Effects on Strength and Ductility of Polymer Foils Studied by Femtosecond Laser-Processed Micro-Tensile Specimens

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1468
Author(s):  
Manuel J. Pfeifenberger ◽  
Gabor Milassin ◽  
Anton Hohenwarter ◽  
Barbara Putz ◽  
Christopher O. A. Semprimoschnig ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Femtosecond Laser ◽  
Electron Irradiation ◽  
Laser Processing ◽  
Irradiation Effects ◽  
Femtosecond Laser Processing ◽  
Rapid Fabrication ◽  
Polymer Foils ◽  
Pet Foils ◽  
Strength And Ductility

The influence of irradiation on mechanical properties of polymer foils used in spacecraft applications has widely been studied via macroscopic tensile samples. An increase in the local resolution of this investigation can be achieved by reducing the sample’s dimensions. A femtosecond laser enables a fast fabrication of micro-samples with dimensions from tens of μ m to the mm range, with ideally no influence on the material. Tensile experiments using such micro-tensile samples were conducted on FEP, Upilex-S and PET foils. The influence of the laser processing on the polymer foils was evaluated. Additionally an investigation of degradation due to electron irradiation was performed. Furthermore an outlook to extend this technique to depth-resolved measurements by preparing samples from locally thinned foils is presented. The study demonstrates the feasibility of femtosecond laser processing for rapid fabrication of micro-samples, enabling insights into the effect of electron irradiation on local mechanical properties of polymers.

Stem Cell-Based Self-Assembled Tissues Cultured on a Nano-Periodic-Structured Surface Patterned Using Femtosecond Laser Processing

2016 ◽  
Vol 10 (1) ◽  
pp. 55-61 ◽  
Author(s):  
Hiromichi Fujie ◽  
◽  
Kei Oya ◽  
Yuki Tani ◽  
Kenji Suzuki ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Culture ◽  
Surface Roughness ◽  
Stem Cell ◽  
Femtosecond Laser ◽  
Laser Processing ◽  
Cell Passage ◽  
Structured Surface ◽  
Femtosecond Laser Processing ◽  
Self Assembled

The present study was conducted to determine the effects of a nano-periodic-structured surface on the morphological and mechanical properties of a stem-cell-based self-assembled tissue (scSAT) developed for biological tissue repair. Nano-periodic groove structures were patterned on a pure titanium surface using femtosecond laser processing, and the structure was replicated on polydimethylsiloxane (PDMS). The depth, periodic pitch, and surface roughness (Ra) of the PDMS grooves were 48 ± 21 nm, 522 ± 9 nm, and 17 ± 5 nm, respectively. Human synovial cells, including mesenchymal stem cells, were subjected to 4-time cell passage, and then cultured on the PDMS surface at a density of 4.0 × 105cells/cm2in a growth medium with 0.2 mM ascorbic acid 2-phosphate to produce scSATs (nano-scSAT). For comparison, some of the cells subjected to 4-time cell passage were cultured on either a flat PDMS substrate with 6 ± 1 nm of surface roughness (Ra) (flat-scSAT) or a commercially available cell culture plate of polystyrene (normal-scSAT), at a cell density identical to that in the nano-scSAT group. At 28 days of cell culture, the scSATs were gently detached from the culture plates and subjected to morphological observation and mechanical testing. Microscopic observation revealed that the nano-scSATs exhibited a dense tissue of cells and an extracellular matrix with an anisotropic structure, while the flat- and normal-scSATs exhibited a sparse and isotropic structure. The tangent modulus and tensile strength were significantly higher in the nano-scSATs than in the flat- and normal-scSATs. These results suggest that a nano-periodic-structured surface improves the morphological and mechanical properties of scSATs.

scholarly journals Nonlinear refractive index of porcine cornea studied by z-scan and self-focusing during femtosecond laser processing

2010 ◽  
Vol 18 (4) ◽  
pp. 3700 ◽  
Author(s):  
M. Miclea ◽  
U. Skrzypczak ◽  
S. Faust ◽  
F. Fankhauser ◽  
H. Graener ◽  
...  
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Nonlinear Refractive Index ◽  
Laser Processing ◽  
Self Focusing ◽  
Femtosecond Laser Processing ◽  
Porcine Cornea

Femtosecond laser processing of silver-containing glass with optical vortex beams

2014 ◽  
Author(s):  
Konstantin Mishchik ◽  
Yannick Petit ◽  
Etienne Brasselet ◽  
Inka Manek-Hönninger ◽  
Nicolas Marquestaut ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Processing ◽  
Optical Vortex ◽  
Femtosecond Laser Processing ◽  
Vortex Beams

Femtosecond laser processing of protein crystals grown in agarose gel

2009 ◽  
Vol 312 (1) ◽  
pp. 73-78 ◽  
Author(s):  
Hitoshi Hasenaka ◽  
Shigeru Sugiyama ◽  
Mika Hirose ◽  
Noriko Shimizu ◽  
Tomoya Kitatani ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Processing ◽  
Protein Crystals ◽  
Agarose Gel ◽  
Femtosecond Laser Processing

Deep-subwavelength ripples on the ZnO surface obtained via metal-film-assisted femtosecond laser processing

2021 ◽  
pp. 151576
Author(s):  
Yaoyao Liu ◽  
Yuxuan Wang ◽  
Ming Yang ◽  
Qiang Wu ◽  
Zhixuan Li ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Processing ◽  
Metal Film ◽  
Femtosecond Laser Processing
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