Enhancing vapor generation at a liquid-solid interface using micro/nanoscale surface structures fabricated by femtosecond laser surface processing

2015 ◽  
Author(s):  
Troy P. Anderson ◽  
Chris Wilson ◽  
Craig A. Zuhlke ◽  
Corey Kruse ◽  
George Gogos ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Surface ◽  
Surface Structures ◽  
Vapor Generation ◽  
Surface Processing ◽  
Solid Interface

3D Electron microscopy characterization of Ag mound-like surface structures made by femtosecond laser surface processing

2019 ◽  
Vol 480 ◽  
pp. 1047-1053
Author(s):  
Edwin Peng ◽  
Alexander Roth ◽  
Craig A. Zuhlke ◽  
Soodabeh Azadehranjbar ◽  
Dennis R. Alexander ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Femtosecond Laser ◽  
Laser Surface ◽  
Surface Structures ◽  
Surface Processing ◽  
3D Electron Microscopy ◽  
3D Electron ◽  
Microscopy Characterization

Optical and Wetting Properties of Femtosecond Laser Nanostructured Materials

2011 ◽  
Vol 14 ◽  
pp. 57-67 ◽  
Author(s):  
A.Y. Vorobyev ◽  
Chun Lei Guo
Keyword(s):  
Femtosecond Laser ◽  
Surface Structure ◽  
Nanostructured Materials ◽  
Wavelength Range ◽  
Laser Surface ◽  
Surface Structures ◽  
Capillary Effect ◽  
Liquid Motion ◽  
Surface Nanostructuring ◽  
Wetting Properties

We modify optical and wetting properties of solids using a femtosecond laser surface nanostructuring technique. We demonstrate that this technique allows creating black and color metals. Absorptance of black titanium created in our study is measured to be about 90-97% over a broad wavelength range from the ultraviolet to infrared. Moreover, our technique can be also used for modifying wetting properties of solids. Here, we create a novel surface structure that transforms regular silicon to superwicking. This surface structure makes water run vertically uphill in a gravity defying way. Our study of the liquid motion shows that the extraordinarily strong self-propelling motion of water is due to a capillary effect from the surface structures we created.

Multi-material, multi-layer femtosecond laser surface processing

2021 ◽  
Author(s):  
Alfred T. Tsubaki ◽  
Mark Anderson ◽  
Andrew Reicks ◽  
Jeffrey E. Shield ◽  
Dennis R. Alexander ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Surface ◽  
Surface Processing

scholarly journals Influence of Femtosecond Laser Surface Nanotexturing on the Friction Behavior of Silicon Sliding Against PTFE

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1237 ◽  
Author(s):  
Alves-Lopes ◽  
Almeida ◽  
Oliveira ◽  
Vilar
Keyword(s):  
Friction Coefficient ◽  
Femtosecond Laser ◽  
Applied Load ◽  
Laser Surface ◽  
Surface Structures ◽  
Testing Time ◽  
Friction Behavior ◽  
Periodic Surface ◽  
Sliding Direction ◽  
Increasing Load

The aim of the present work was to investigate the influence of laser-induced periodic surface structures (LIPSS) produced by femtosecond laser on the friction behavior of silicon sliding on polytetrafluoroethylene (PTFE) in unlubricated conditions. Tribological tests were performed on polished and textured samples in air using a ball-on-flat nanotribometer, in order to evaluate the friction coefficient of polished and textured silicon samples, parallel and perpendicularly to the LIPSS orientation. In the polished specimens, the friction coefficient decreases with testing time at 5 mN, while it increases slightly at 25 mN. It also decreases with increasing applied load. For the textured specimens, the friction coefficient tends to decrease with testing time in both sliding directions studied. In the parallel sliding direction, the friction coefficient decreases with increasing load, attaining values similar to those measured for the polished specimen, while it is independent of the applied load in the perpendicular sliding direction, exhibiting values lower than in the two other cases. These results can be explained by variations in the main contributions to friction and in the wear mechanisms. The influence of the temperature increase at the interface and the consequent changes in the crystalline phases of PTFE are also considered.

scholarly journals Near-unity broadband omnidirectional emissivity via femtosecond laser surface processing

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Andrew Reicks ◽  
Alfred Tsubaki ◽  
Mark Anderson ◽  
Jace Wieseler ◽  
Larousse Khosravi Khorashad ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Surface Properties ◽  
Large Scale ◽  
Low Cost ◽  
Processing Parameters ◽  
Laser Surface ◽  
Metallic Surfaces ◽  
Surface Processing ◽  
Perfect Absorption ◽  
Distinct Features

AbstractIt is very challenging to achieve near perfect absorption or emission that is both broadband and omnidirectional while utilizing a scalable fabrication process. Femtosecond laser surface processing is an emerging low-cost and large-scale manufacturing technique used to directly and permanently modify the surface properties of a material. The versatility of this technique to produce tailored surface properties has resulted in a rapidly growing number of applications. Here, we demonstrate near perfect, broadband, omnidirectional emissivity from aluminum surfaces by tuning the laser surface processing parameters including fluence, pulse count, and the ambient gas. Full-wave simulations and experimental results prove that the obtained increase in emissivity is mainly a result of two distinct features produced by femtosecond laser surface processing: the introduction of microscale surface features and the thick oxide layer. This technique leads to functionalized metallic surfaces that are ideal for emerging applications, such as passive radiative cooling and thermal management of spacecraft.

scholarly journals Micro/nanostructures formation by femtosecond laser surface processing on amorphous and polycrystalline Ni60Nb40

2017 ◽  
Vol 396 ◽  
pp. 1170-1176 ◽  
Author(s):  
Edwin Peng ◽  
Alfred Tsubaki ◽  
Craig A. Zuhlke ◽  
Meiyu Wang ◽  
Ryan Bell ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Laser Surface ◽  
Surface Processing
Sign in / Sign up

Export Citation Format

Share Document