scholarly journals Progress in Applications and Physical Mechanisms of Laser Ablation in Material Processing I: Application in Materials Processing, Surface Modification and Nanograting

2013 ◽  
Vol 02 (02) ◽  
pp. 42-50
Author(s):  
敏华 何
Keyword(s):  
Material Processing ◽  
Surface Modification ◽  
Laser Ablation ◽  
Materials Processing ◽  
Physical Mechanisms

Physical mechanisms of SiNx layer structuring with ultrafast lasers by direct and confined laser ablation

2015 ◽  
Vol 117 (10) ◽  
pp. 105304 ◽  
Author(s):  
S. Rapp ◽  
G. Heinrich ◽  
M. Wollgarten ◽  
H. P. Huber ◽  
M. Schmidt
Keyword(s):  
Laser Ablation ◽  
Ultrafast Lasers ◽  
Physical Mechanisms ◽  
Sinx Layer

Modeling the Conditions for Microdroplets Formation and their Detachment from the Molten Metal on the Electrode

2021 ◽  
Vol 313 ◽  
pp. 1-7
Author(s):  
V.D. Sarychev ◽  
S.A. Solodsky ◽  
Sergey A. Nevskii ◽  
M.A. Kuznetsov ◽  
D.P. Ilyaschenko ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Molten Metal ◽  
High Frequency ◽  
Plasma Discharge ◽  
Pulse Action ◽  
Materials Processing ◽  
Physical Processes ◽  
Micro Scale ◽  
Physical Mechanisms ◽  
Frequency Pulse

Formation of nanostructure states on the surface of materials exposed to concentrated flows of energy is one of the relevant problems of modern materials processing. In the paper the authors describe the mechanism of the micro-scale droplets formation based on the study and modeling of the physical processes and technological aspects of the interaction between the heterogenic plasma flows and the molten substance at the electrode tip. The authors show new physical mechanisms and criteria for micro-and nanoparticles origination, develop a physical-mathematical model of the interaction between the molten metal and the plasma discharge with imposed high-frequency pulse action.

Micro and Nano Particle Manipulation Using Optically Modulated Electrokinetic Flows

2009 ◽  
Author(s):  
Stuart J. Williams ◽  
Aloke Kumar ◽  
Steven T. Wereley
Keyword(s):  
Surface Modification ◽  
Parallel Plate ◽  
Near Infrared ◽  
Lab On A Chip ◽  
Nano Particle ◽  
Particle Manipulation ◽  
Physical Mechanisms ◽  
Particle Sorting ◽  
Electrokinetic Flows ◽  
Optically Induced

Recently, we have demonstrated an optically induced AC electrokinetic technique that rapidly, continuously and selectively concentrates colloids on an electrode surface [1–3]. This is demonstrated with a highly focused near-infrared (1,064 nm) laser beam applied to parallel plate electrodes separated by 50 μm without any additional surface modification or patterning of the electrodes. This dynamic optically-induced technique can be applied towards a variety of lab-on-a-chip applications. This paper will explain its physical mechanisms and showcase recent results regarding its particle sorting capabilities. This dynamic, optically induced fluid and particle manipulation technique could be used for a variety of lab-on-a-chip applications.

Non-Equilibrium Thermodynamics and Formation of Nanoparticles in Femtosecond Laser Ablation

2004 ◽  
Author(s):  
Changrui Cheng ◽  
Xianfan Xu
Keyword(s):  
Laser Ablation ◽  
Femtosecond Laser ◽  
Femtosecond Laser Ablation ◽  
Md Simulations ◽  
Materials Processing ◽  
High Heating Rate ◽  
Laser Materials ◽  
High Heating ◽  
Temperature And Pressure ◽  
Reduced Temperature

High intensity femtosecond laser ablation processes are computed by molecular dynamics (MD) simulations. The procedure of MD modeling and related numerical techniques are introduced. The volumetric phase separation is illustrated. The emphasis is to understand the thermodynamic state of a material which is heated with an extremely high heating rate, and the formation of particles with nanometer size in the laser-ablated plume. It is revealed that nanoparticles are originated from expansion of a supercritical fluid in a reduced temperature and pressure environment. The parameters of the nanoparticles (temperature, size and velocity) are shown. The results will help to understand femtosecond laser materials processing and applications where nanoparticles are of interest.

scholarly journals Improvement of hydrophilicity of polyamide using atmospheric pressure plasma jet

BIBECHANA ◽  
2020 ◽  
Vol 17 ◽  
pp. 133-138 ◽  
Author(s):  
H B Baniya ◽  
R P Guragain ◽  
B Baniya ◽  
G Qin ◽  
D P Subedi
Keyword(s):  
Material Processing ◽  
Surface Modification ◽  
Atmospheric Pressure ◽  
Atmospheric Pressure Plasma ◽  
Polymeric Materials ◽  
Plasma Jet ◽  
Angle Measurement ◽  
Atmospheric Pressure Plasma Jet ◽  
High Voltage Power Supply ◽  
Pressure Plasma

Atmospheric Pressure Plasma Jet (APPJ) has many applications in material processing such as surface modification and biomedical material processing. APPJ has been generated by a high voltage power supply (0-20 KV) at an operating frequency of (20-30) 23 kHz. This paper reports the generation and characterization of APPJ in Argon environment and its application in the surface modification of polymeric materials. The discharge has been characterized by optical and electrical methods. In order to characterize the plasma jet, its electron temperature and electron density has been determined by optical emissions spectroscopy. The surface properties of the untreated and plasma treated Polyamide (PA) samples were characterized by contact angle measurement and surface energy analysis. BIBECHANA 17 (2020) 133-138

scholarly journals Physical mechanisms of pulsed infrared laser ablation of biological tissues

1998 ◽  
Author(s):  
Andrew D. Yablon ◽  
Norman S. Nishioka ◽  
B. B. Mikic ◽  
Vasan Venugopalan
Keyword(s):  
Laser Ablation ◽  
Biological Tissues ◽  
Infrared Laser ◽  
Physical Mechanisms

Effect of liquid environment on the titanium surface modification by laser ablation

2017 ◽  
Vol 405 ◽  
pp. 298-307 ◽  
Author(s):  
Nisar Ali ◽  
Shazia Bashir ◽  
Umm-i-Kalsoom ◽  
Narjis Begum ◽  
Muhammad Shahid Rafique ◽  
...  
Keyword(s):  
Surface Modification ◽  
Laser Ablation ◽  
Titanium Surface ◽  
Liquid Environment

Foreign Gas Effect upon Excimer Laser Ablation of Polymer

1990 ◽  
Vol 191 ◽  
Author(s):  
N. Shimo ◽  
T. Uchida ◽  
H. Masuhara
Keyword(s):  
Surface Modification ◽  
Laser Ablation ◽  
Etch Rate ◽  
Polymer Surface ◽  
Active Surface ◽  
Inert Gases ◽  
Surface Chemical ◽  
Excimer Laser Ablation ◽  
Surface Chemical Composition ◽  
Gas Effect

ABSTRACTWe have examined effect of foreign gas and its pressure upon etch rate, surface morphology, and surface chemical composition. Etch rate is suppressed by adding inert gases such as argon and helium. On the contrary, oxygen enhances the rate by increasing its pressure, indicating that oxygen molecules react with ablated polymer surface. From the results of XPS analyses, active surface of ablated polymer reacts also with ammonia and hexamethyldisilane. It is considered that laser ablation has a high potentiality of simultaneous microfabrication and photochemical surface modification of polymer.

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