Electrohydrodynamic Pressure Enhanced by Free Space Charge for Electrically Induced Structure Formation with High Aspect Ratio

Langmuir ◽  
2014 ◽  
Vol 30 (42) ◽  
pp. 12654-12663 ◽  
Author(s):  
Hongmiao Tian ◽  
Chunhui Wang ◽  
Jinyou Shao ◽  
Yucheng Ding ◽  
Xiangming Li
Keyword(s):  
Aspect Ratio ◽  
Space Charge ◽  
Structure Formation ◽  
High Aspect Ratio ◽  
Free Space ◽  
Induced Structure

Role of space charges inside a dielectric polymer in the electrohydrodynamic structure formation on a prepatterned polymer (ESF-PP)

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77275-77283 ◽  
Author(s):  
Hongmiao Tian ◽  
Jinyou Shao ◽  
Hong Hu ◽  
Li Wang ◽  
Yucheng Ding
Keyword(s):  
Aspect Ratio ◽  
Structure Formation ◽  
High Aspect Ratio ◽  
Space Charges ◽  
Dielectric Polymer

Mushroom-shaped structures with a high aspect ratio are fabricated based on the action of space charges inside the dielectric polymer.

scholarly journals The orientation of the layered aluminosilicates particles with a high aspect ratio in paraffin under electric field

2019 ◽  
Vol 486 (6) ◽  
pp. 663-667
Author(s):  
N. M. Kuznetsov ◽  
A. V. Bakirov ◽  
S. I. Belousov ◽  
S. N. Chvalun
Keyword(s):  
Aspect Ratio ◽  
Electric Field ◽  
Structure Formation ◽  
High Aspect Ratio ◽  
Structural Organization ◽  
X Ray ◽  
X Ray Scattering ◽  
Filler Particles ◽  
Tubular Shape ◽  
Ray Scattering

The electrorheological behavior is significantly affected by the strength of the structure formed in the electric field, due to the filler particles orientation. The structural organization of the filler in electric field was studied by X-ray scattering on paraffin films. Particles of layered aluminosilicates with a high aspect ratio and various morphology such as montmorillonite and halloysite were used as fillers. The differences in the structure formation by fillers of plate and tubular shape were shown.

Fabrication of High-Aspect-Ratio Structural Change Microregions in Silicon Carbide by Femtosecond Bessel Beams

2015 ◽  
Vol 1102 ◽  
pp. 143-147
Author(s):  
Liang Liang Zhao ◽  
Feng Wang ◽  
Jun Xie ◽  
Wei Wei Zhao
Keyword(s):  
Silicon Carbide ◽  
Structural Change ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Propagation Distance ◽  
Bessel Beams ◽  
Convex Lens ◽  
Potential Applications ◽  
Optimized Conditions ◽  
Induced Structure

This letter presents the morphology of femtosecond Bessel beams induced high-aspect-ratio structural change regions in bulk silicon carbide. An axion is engaged in transforming Gaussians beams to Bessel beams, which are then focused on the surface or below the surface of the sample by combination of a plano-convex lens and a microscope objective. The sample is scanned by the focused femtosecond Bessel beams at the preset patterns. Through this method, the high-aspect-ratio uniform laser induced structure change regions have been produced and the highest respect ratio can reach 206 with the depth of 330 μm, the width of 1.6 μm in optimized conditions of appropriate focusing position and pulse energy. This result is attributed to uniform energy distribution in the long propagation distance of Bessel beams with nondiffracting. This technique will have great potential applications to make high-aspect-ratio microgrooves in wide-gap and transparent materials.

scholarly journals High Aspect Ratio Thin-Walled Structures in D2 Steel through Wire Electric Discharge Machining (EDM)

Micromachines ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Naveed Ahmed ◽  
Muhammad Ahmad Naeem ◽  
Ateekh Ur Rehman ◽  
Madiha Rafaqat ◽  
Usama Umer ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Structure Formation ◽  
High Aspect Ratio ◽  
Electrical Discharge Machining ◽  
Machining Processes ◽  
Thin Structures ◽  
Thin Sections ◽  
Thin Walled Structures ◽  
Machining Errors ◽  
D2 Steel

Thin structures are often required for several engineering applications. Although thick sections are relatively easy to produce, the cutting of thin sections poses greater challenges, particularly in the case of thermal machining processes. The level of difficulty is increased if the thin sections are of larger lengths and heights. In this study, high-aspect-ratio thin structures of micrometer thickness (117–500 µm) were fabricated from D2 steel through wire electrical discharge machining. Machining conditions were kept constant, whereas the structure (fins) sizes were varied in terms of fin thickness (FT), fin height (FH), and fin length (FL). The effects of variation in FT, FH, and FL were assessed over the machining errors (FT and FL errors) and structure formation and its quality. Experiments were conducted in a phased manner (four phases) to determine the minimum possible FT and maximum possible FL that could be achieved without compromising the shape of the structure (straight and uniform cross-section). Thin structures of smaller lengths (1–2 mm long) can be fabricated easily, but, as the length exceeds 2 mm, the structure formation loses its shape integrity and the structure becomes broken, deflected, or deflected and merged at the apex point of the fins.

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