scholarly journals Using Stereolithographic Printing to Manufacture Monolithic Microfluidic Devices with an Extremely High Aspect Ratio

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3750
Author(s):  
Pin-Chuan Chen ◽  
Po-Tsang Chen ◽  
Tuan Ngoc Anh Vo
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Dimensional Accuracy ◽  
Microfluidic Devices ◽  
Oxygen Inhibition ◽  
Dimensional Precision ◽  
Inner Surface ◽  
Inhibition Process ◽  
High Degree

Stereolithographic printing (SL) is widely used to create mini/microfluidic devices; however, the formation of microchannels smaller than 500 μm with good inner surface quality is still challenging due to the printing resolution of current commercial printers and the z-overcure error and scalloping phenomena. In the current study, we used SL printing to create microchannels with the aim of achieving a high degree of dimensional precision and a high-quality microchannel inner surface. Extensive experiments were performed and our results revealed the following: (1) the SL printing of microchannels can be implemented in three steps including channel layer printing, an oxygen inhibition process, and roof layer printing; (2) printing thickness should be reduced to minimize the scalloping phenomenon, which significantly improves dimensional accuracy and the quality of inner microchannel surfaces; (3) the inclusion of an oxygen inhibition step is a critical and efficient approach to suppressing the z-overcure error in order to eliminate the formation of in-channel obstructions; (4) microchannels with an extremely high aspect ratio of 40:1 (4000 μm in height and 100 μm in width) can be successfully manufactured within one hour by following the three-step printing process.

CHARACTERIZATION AND ELECTRICAL PROPERTIES OF ALIGNED CARBON NANOTUBES WITH HIGH ASPECT RATIO

2011 ◽  
Vol 10 (01n02) ◽  
pp. 23-28
Author(s):  
RAVI BHATIA ◽  
V. PRASAD ◽  
M. REGHU
Keyword(s):  
Electron Microscopy ◽  
Carbon Nanotubes ◽  
Aspect Ratio ◽  
Multiwall Carbon Nanotubes ◽  
High Quality ◽  
Transmission Electron Microscopy Analysis ◽  
Transmission Electron ◽  
Electron Microscopy Analysis ◽  
High Degree

High-quality multiwall carbon nanotubes (MWNTs) were produced by a simple one-step technique. The production of MWNTs was based on thermal decomposition of the mixture of a liquid phase organic compound and ferrocene. High degree of alignment was noticed by scanning electron microscopy. The aspect ratio of as-synthesized MWNTs was quite high (more than 4500). Transmission electron microscopy analysis showed the presence of the catalytic iron nanorods at various lengths of MWNTs. Raman spectroscopy was used to know the quality of MWNTs. The ratio of intensity of the G-peak to the D-peak was very high which revealed high quality of MWNTs. Magnetotransport studies were carried out at low temperature and a negative MR was noticed.

scholarly journals Microfabricating high-aspect-ratio structures in polyurethane-methacrylate (PUMA) disposable microfluidic devices

Lab on a Chip ◽  
2009 ◽  
Vol 9 (13) ◽  
pp. 1951 ◽  
Author(s):  
Jason S. Kuo ◽  
Yongxi Zhao ◽  
Laiying Ng ◽  
Gloria S. Yen ◽  
Robert M. Lorenz ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Microfluidic Devices

The Effects of Resharpening Accuracy on Drill Failure and Hole Straightness in High Aspect Ratio Gundrilling of Inconel-718

2012 ◽  
Vol 565 ◽  
pp. 388-393
Author(s):  
Keng Soon Woon ◽  
Shigeyuki Kanno ◽  
Kui Liu
Keyword(s):  
Pilot Study ◽  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Inconel 718 ◽  
Failure Modes ◽  
Drilling Process ◽  
The Stability ◽  
Drilling Conditions ◽  
High Degree

This paper presents a pilot study on the consistency of high aspect ratio gundrilling of Inconel-718 that involves the drilling of three holes of 8mm in diameter and 1600mm in depth, under constant drilling conditions. But high degree of straightness variations among these holes indicates that critical drill geometries could not be accurately regenerated through the drill resharpening operation. As a result, vast variability is introduced to the process which has severe detrimental effects on the stability of the drilling process and degradation and failure modes of the drill as well the straightness accuracy of the holes.

scholarly journals Optical Detection Method for High Aspect Ratio Microstructures

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 296
Author(s):  
Wenbin Wei ◽  
Shuangyue Hou ◽  
Zhao Wu ◽  
Yue Hu ◽  
Yi Wang ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
Visible Light ◽  
High Aspect Ratio ◽  
Detection Method ◽  
Optical Detection ◽  
System Parameters ◽  
Efficient Detection ◽  
Reflection Of Light ◽  
Application Fields

High aspect ratio microstructures (HARMS) are of great importance for many application fields. Many defects are generated during the fabrication processes, especially in line microstructures, and it is necessary to examine the quality of the structures after each process. However, there is no suitable efficient nondestructive detection method to monitor microstructures during the fabrication processes. In this paper, an optical detection method capable of detecting the structures by analyzing the reflection of light on the line HARMS is proposed. According to the image of reflected visible light, this method can determine whether there are defects in structures, so as to realize efficient detection. Preliminary simulations and experiments have been performed to confirm the feasibility and validity of the proposed method for detecting line microstructures. This method is expected to obtain more information about microstructures by further optimizing system parameters.

Methodologies for Quantifying FIB “Milling Acuity”

2009 ◽  
Author(s):  
Chad Rue
Keyword(s):  
Aspect Ratio ◽  
Real World ◽  
High Aspect Ratio ◽  
Process Development ◽  
Spot Size ◽  
Performance Tests ◽  
Imaging Resolution ◽  
Measuring Scheme ◽  
Column Performance

Abstract FIB column performance can be difficult to evaluate, and the traditional metrics of imaging resolution and minimum spot size give little indication of how a FIB system will perform its intended daily tasks. A series of supplemental FIB performance tests is proposed to quantify “milling acuity” under real-world conditions. A quantitative measuring scheme for evaluating the quality of High Aspect Ratio (HAR) vias is proposed, and an example is shown in which the HAR measuring scheme can be used for process development.

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