nanosecond pulse laser
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2022 ◽  
Vol 145 ◽  
pp. 107497
Author(s):  
Fengyuan Shu ◽  
Sicheng Niu ◽  
Baohua Zhu ◽  
Laijun Wu ◽  
Hongbo Xia ◽  
...  

2021 ◽  
Vol 144 ◽  
pp. 107411
Author(s):  
Hao Wang ◽  
Liang Guo ◽  
Xin Zhang ◽  
Jikun Dong ◽  
Qitao Lue ◽  
...  

Author(s):  
Viboon Tangwarodomnukun ◽  
Supawan Kringram ◽  
Hao Zhu ◽  
Huan Qi ◽  
Nopporn Rujisamphan

Laser texturing process is a promising method to alter the wettability of metal surface on which micro/nano rough structures are created for changing the contact angle between the textured surface and liquid droplet. This paper aims at fabricating a superhydrophobic surface on AISI316L stainless steel, and a nanosecond pulse laser was employed for texturing line and point patterns on the metal surface. The influences of texturing patterns, laser power, scan speed, irradiation duration, and aging hours on the water contact angle and morphology of workpiece surface were investigated. According to the results, the hydrophilic surface was obtained right after the texturing process, and the surface turned to be hydrophobic after being left in ambient air for 15 days. The aging of laser-textured surface was also performed to induce the chemisorption of hydrocarbons toward the surface. This post process was able to shorten the hydrophilic-to-hydrophobic transition from days to a few hours. The aging duration of 2 and 0.5 h was respectively recommended for yielding and stabilizing the superhydrophobicity on line- and point-patterned surfaces. The maximum contact angle of 159.61° was achievable when the point pattern was textured on the stainless steel surface by using the laser power of 10 W and irradiation duration of 0.18 ms.


Membranes ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 550
Author(s):  
Xiaofan Du ◽  
Jing Wang ◽  
Lan Chen ◽  
Zhenxi Zhang ◽  
Cuiping Yao

Delivering extracellular materials into adherent cells presents several challenges. A homemade photoporation platform, mediated by gold nanoparticles (AuNPs), was constructed to find a suitable method for finding all adherent cells in this process with high delivery efficiency. The thermal dynamics of AuNPs could be monitored. Based on this system, 60 nm AuNPs were selected to be attached to cells for optimal photoporation. After irradiating the cells covered with AuNPs using a nanosecond pulse laser, fluorescein isothiocyanate-dextran in the medium were delivered into optoporated adherent HeLa (human cervical cell lines) cells. The delivery efficiency and cell viability of this process were evaluated using a fluorescence microscope and flow cytometry. The experimental results showed that targeting cells using antibodies, laser irradiation from the top of the cell culture well, and reducing the cell medium are important for improving the delivery efficiency. The optimal loading efficiency for adherent HeLa cells was 53.4%.


Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3834
Author(s):  
Wanqin Zhao ◽  
Xuesong Mei

Trepanning pattern is an important factor in laser hole machining, affecting both the hole quality and process efficiency. The influence of laser trepanning patterns on the hole ablating using nanosecond pulse laser in Al2O3 ceramics substrate was studied. Two laser trepanning patterns were evaluated, filled spiral trepanning and multiple rings trepanning, with the optimized laser machining parameters. In conjunction with the studies, the hole saturated taper and the saturated processing time were taken as the primary criteria for evaluation of the hole quality and the machining efficiency, respectively. Finally, the trepanning patterns were optimized aiming for the high hole quality; the process was based on the saturated hole tapers. The hole high qualities and machining efficiencies were obtained based on the saturated processing time, which was proven to have a great significance when using the nanosecond pulse laser to machine Al2O3 ceramics substrate.


2021 ◽  
Vol 139 ◽  
pp. 106945
Author(s):  
Baohua Zhu ◽  
Liang Zhen ◽  
Hongbo Xia ◽  
Jianhui Su ◽  
Sicheng Niu ◽  
...  

2021 ◽  
Vol 127 (4) ◽  
Author(s):  
Haili Jiang ◽  
Hongyu Cheng ◽  
Yichen He ◽  
Lu Liu ◽  
Shuangqiang Liu ◽  
...  

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