High-aspect-ratio microtubes with variable diameter and uniform wall thickness by compressing Bessel hologram phase depth

2018 ◽  
Vol 43 (15) ◽  
pp. 3514 ◽  
Author(s):  
Shengyun Ji ◽  
Liang Yang ◽  
Chenchu Zhang ◽  
Ze Cai ◽  
Yanlei Hu ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Wall Thickness ◽  
High Aspect Ratio ◽  
Variable Diameter ◽  
Uniform Wall

Micromachining for Terahertz Artificial Materials

2007 ◽  
Vol 1016 ◽  
Author(s):  
Andrew Gallant ◽  
G. Peter Swift ◽  
De Chang Dai ◽  
Mikhail Kaliteevski ◽  
Dagou A Zeze ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Variable Diameter ◽  
Artificial Materials ◽  
Terahertz Frequencies ◽  
Fixed Period

AbstractIn this paper we report on the development of micromachined filters for operation at terahertz frequencies. SU8, a negative photodefinable epoxy, is used to define arrays of high aspect ratio rods which are subsequently sputter coated in gold to form the filter. We fabricate and test a filter with a fixed period but variable diameter along the length of the array. By moving the array in the terahertz beam we demonstrate the ability to mechanically tune specific filter characteristics from a single device.

Boehmite Nanofibers as a Dispersant for Nanotubes in an Aqueous Sol

2018 ◽  
Author(s):  
Gen Hayase
Keyword(s):  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Aqueous Solutions ◽  
High Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon ◽  
Nanotube Films

By exploiting the dispersibility and rigidity of boehmite nanofibers (BNFs) with a high aspect ratio of 4 nm in diameter and several micrometers in length, multiwall-carbon nanotubes (MWCNTs) were successfully dispersed in aqueous solutions. In these sols, the MWCNTs were dispersed at a ratio of about 5–8% relative to BNFs. Self-standing BNF–nanotube films were also obtained by filtering these dispersions and showing their functionality. These films can be expected to be applied to sensing materials.

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