Please note that the program is published in Central European Summer Time (CEST).

Back to overview

Poster

Processing of Functional Texturing on Micro-fibers by Laser Induced Periodic Surface Structures

Wednesday (24.06.2020)
11:20 - 11:23 Room 1
Part of:
Line-Up:
- Poster Processing of Functional Texturing on Micro-fibers by Laser Induced Periodic Surface Structures 1 Prof. Masaki Yamaguchi
- Poster 3D microfabrication of thermoset polymer PDMS using laser-induced bubble 1 Prof. Yasutaka Hanada
- Poster *student* Laser-Peening with solid state medium as plasma confinement layer 1 Yuki Sugimoto
- Poster *student* Numerical Simulation and Test Experiments of Selective Laser Thermoregulation for Accelerated Degradation Test of SiC/SiC CMC 1 Hayato Koshiji
- Poster *student* Laser peening of sprayed ceramics film 1 Yuya Yasuyoshi
- Poster *student* Influence of thickness of plasma confinement layer on laser peening using near infrared laser 1 Hikaru Hirata
- Poster *student* Green femtosecond laser direct writing using reduction of glyoxylic acid Co/Ni complexes 1 Hikaru Nakatani
- Poster Ultrafast pulse GHz burst mode laser ablation for efficient surface microprocessing 1 Ph.D. Francesc Caballero Lucas
- Poster *student* Development of hybrid laser system with blue diode laser and single mode fiber laser for welding of pure copper 1 Shumpei Fujio
- Poster *student* High stability of frequency and robustness of noise-like pulse fiber laser 1 Hitoshi Nakano
- Poster *student* Broadband pulsed fiber laser for suppression of stimulated Brillouin scattering 1 Tetsuya Yamazaki
- Poster Aligned growth of ZnO nanowires on diamond by nanoparticle-assisted pulsed laser deposition 1 Dr. Daisuke Nakamura
- Poster *student* Spectrometer-based Ultrashort Pulsed Laser Selective Microstructuring of Ni/NiCr Multi-layer Coatings 1 Chao He
- Poster *student* Femto- and nanosecond laser surface modification of stainless steel 1 Dipl.-Volkswirt Paulina Dzienny
- Poster Laser writing of waveguides in porous glass for small molecules detection 1 Dr. Roman Zakoldaev
- Poster *student* Homogeneous intensity within the Rayleigh length and enhanced depth of focus for Gaussian beams 1 Christian Bischoff
Session Chair


Session PS: Poster Session 01
Belongs to:
Topic PS: Poster Session


Objectives: Functional textures on fiber surfaces are useful in various textile applications, including wettability, moisture retention, breathability, dyeability, cushioning, and touch sensation. However, it is difficult to process micro- and nano-textures on fibers with micron-scale diameters because of the risk of rupture. The purpose of this study was to establish a method for fabricating a laser induced periodic surface structure (LIPSS) on micro-fibers induced by a femtosecond laser to express the function of wettability.

Methods: The micro- and nano-patterned surfaces were produced through laser ablation using a femtosecond laser (Carbide, Light Conversion UAB, Lithuania) with a wavelength of 1028 nm, a pulse length of 234 fs at a repetition rates of 60 kHz, and a spot diameter of 7 microns. Various geometries and structures of the irradiated surfaces were compared with experimental observations of glass fibers (quartz, 125 microns of cladding diameter, 20 degrees of equilibrium contact angle, Furukawa Electric Co., Ltd., Japan) using a scanning electron microscope. An overview is given of how the microscopic properties of the generated surfaces depend on the laser parameters of the fluence, F, ranging from 2.34 to 18.36 J/cm^2 and the overlap ratio of laser spots, OR. The apparent contact angles of the glass fibers were measured using a commercial contact angle analyzer (DM-701, Kyowa Interface Science Co. Ltd., Japan) by dropping a 1 micro-L of distilled water droplet from a microsyringe between two glass fibers.

Results and Discussion: A LIPSS was observed on the glass surface when F and/or OR exceeded a threshold level. The glass fiber ruptured for F > 18 J/cm^2. Before laser processing, the apparent contact angle of the glass fiber was 107.0 degrees, which agreed well with the calculation results of the Cassie–Baxter equation with a cylindrical model. After laser processing, the apparent contact angles ranged from 89.0 to 106.4 degrees, and they decreased from 80.7 to 48.7 degrees when a LIPSS was observed. In particular, hydrophilicity under 51.1 degrees was achieved, the considered reason being the non-continuous change in wettability from the Cassie state to the Wenzel state.

Conclusion: Regarding fiber hydrophilicity, the experimental data show evidence of a LIPSS on laser-ablated glass fibers. Thus, the optimum conditions for inducing a LIPSS and a hydrophilic surface on a glass fiber are identified.

Speaker:
Prof. Masaki Yamaguchi
Shinshu University
Additional Authors:
  • Ryosuke Kase
    Shinshu University
  • Hidenori Shimada
    Shinshu University

Dateien

Category Short file description File description File Size
Poster Version 1 This is a short manuscript to the abstract. 217 KB Download
Poster Poster_No.25 This is a pdf-file of my poster. 657 KB Download