Non-textured laser modification of silica glass surface: Wettability control and flow channel formation

2016 ◽  
Vol 371 ◽  
pp. 530-537 ◽  
Author(s):  
Yuko Aono ◽  
Atsushi Hirata ◽  
Hitoshi Tokura
Keyword(s):  
Silica Glass ◽  
Glass Surface ◽  
Flow Channel ◽  
Surface Wettability ◽  
Channel Formation ◽  
Laser Modification

Structural modification on silica glass surface induced by thermal poling for second harmonic generation

2001 ◽  
Vol 8 (2) ◽  
pp. 788-790 ◽  
Author(s):  
V. Nazabal ◽  
E. Fargin ◽  
G. Le Flem ◽  
V. Briois ◽  
C. Cartier Dit Moulin ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Silica Glass ◽  
Glass Surface ◽  
Structural Modification ◽  
Second Harmonic ◽  
Thermal Poling

Fabrication and Characterization of Tuneable Flow-Channel/Gas-Diffusion-Layer Interface for Polymer Electrolyte Fuel Cells

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Deepashree Thumbarathy ◽  
Gaurav Gupta ◽  
Mohamed Mamlouk ◽  
Prodip K. Das
Keyword(s):  
Fuel Cells ◽  
Surface Morphology ◽  
Polymer Electrolyte ◽  
Diffusion Layer ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Polymer Electrolyte Fuel Cells ◽  
Flow Channel ◽  
Surface Wettability ◽  
Selective Wetting

Abstract Gas diffusion layer (GDL) and its interfaces with the flow-channel and microporous layer or catalyst layer in polymer electrolyte fuel cells (PEFCs) play a significant role in water management and heat removal from the cells. Both surface morphology and surface wettability of GDL influence and control the water transport in PEFCs. Thus, the surface morphology and selectivity of its surface wettability are critical for PEFCs to provide optimum outputs. In this study, we have reported the fabrications of GDLs with a selective wetting pattern. Sigracet® GDLs were used as a substrate and two different monomers, polydimethylsiloxane (PDMS) added with fumed silica (Si) and fluorinated ethylene propylene (FEP), were used to print a selective pattern on the GDL surfaces. The evaluations of printed GDL surfaces, by means of static contact angle, sliding angles, and scanning electron microscopy image show that superhydrophobicity was achieved with both FEP and PDMS-Si coatings. Fourier transform infrared spectroscopy analysis confirmed the successful introduction of the functional groups in both the coatings. Finally, pore size distributions, sliding angle measurements, and adhesion forces were used to investigate the interactions between the water droplets and GDL surfaces. The results of this study demonstrate that the present approach provides a novel but simple way to tune GDL surfaces with selective wetting properties and obtain superhydrophobic interfaces. The electrochemical results showed that an improvement can be achieved for the performance of PEFCs with patterned GDL/flow-channel interfaces.

Femtosecond laser assisted fabrication of networked semi-occlusive microfluidic channel on fused silica glass surface

Optik ◽  
2017 ◽  
Vol 140 ◽  
pp. 953-958 ◽  
Author(s):  
Guang Li ◽  
Guoying Feng ◽  
Shutong Wang ◽  
Hua Zhang ◽  
Zhuping Wang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Silica Glass ◽  
Glass Surface ◽  
Microfluidic Channel ◽  
Fused Silica ◽  
Fused Silica Glass

The Effect of the CCl3F-Treatment on Wettability of Silica Glass Surface by Water and Organic Liquid

1992 ◽  
Vol 65 (2) ◽  
pp. 628-629
Author(s):  
Akito Kurosaki ◽  
Susumu Okazaki ◽  
Yoshiyuki Nishiyama
Keyword(s):  
Silica Glass ◽  
Glass Surface ◽  
Organic Liquid

Crack-Free Silica Glass Surface Micro-Grooves Etched by 248 nm Excimer Lasers

2017 ◽  
Vol 44 (9) ◽  
pp. 0902004
Author(s):  
杨桂栓 Yang Guishuan ◽  
陈涛 Chen Tao ◽  
陈虹 Chen Hong
Keyword(s):  
Silica Glass ◽  
Glass Surface ◽  
Excimer Lasers ◽  
Free Silica

Effect of Gas Diffusion Layer Surface Wettability Gradient on Water Behavior in a Serpentine Gas Flow Channel of Proton Exchange Membrane Fuel Cell

2018 ◽  
Vol 140 (8) ◽  
Author(s):  
Sneha Malhotra ◽  
Sumana Ghosh
Keyword(s):  
Fuel Cell ◽  
Diffusion Layer ◽  
Gas Flow ◽  
Proton Exchange Membrane ◽  
Gas Diffusion Layer ◽  
Gas Diffusion ◽  
Flow Channel ◽  
Proton Exchange ◽  
Surface Wettability ◽  
Exchange Membrane

Water removal and behavior, in proton exchange membrane fuel cell (PEMFC) gas flow channel has been investigated in this work. Single serpentine gas flow channel has been simulated. Hydrodynamics of water drops in a serpentine channel are studied as a function of nature of gas diffusion layer (GDL) surface wettability. In one case, the surface becomes gradually hydrophobic starting from 90 deg to 170 deg. In this second case, the value of contact angle reduces to 10 deg. A three-dimensional model has been developed by using cfd software. Two different drop of diameter 0.2 mm and 0.4 mm are simulated for all the cases. It is observed that, water coverage is always lesser for a gradual hydrophobic surface. Also at low air velocity and gradual hydrophobic GDL surface results in lesser pressure drop as well as water coverage.

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