Structural and performance comparison between SU-8 microfabricated and 3D-printed microneedle electrodes

2020 ◽  
Vol 4 (1) ◽  
pp. 29-44
Author(s):  
Ramin Soltanzadeh ◽  
Elnaz Afsharipour ◽  
Neda Anssari ◽  
Behzad Mansouri ◽  
Cyrus Shafai
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Nerve Conduction Velocity ◽  
Performance Comparison ◽  
High Frequencies ◽  
Microscopy Image ◽  
3D Printed ◽  
Microneedle Arrays ◽  
And Performance ◽  
Scanning Electron

Aim: This study is aimed to compare the structure and performance of 3D-printed and microfabricated microneedle arrays (MNAs). Materials & methods: MNAs were produced using either stereolithography printing or were micro-fabricated using SU-8 polymer. The structure of both MNA types were tested and compared through scanning electron microscopy. MNA performance was also evaluated through electrical impedence spectroscopy and nerve conduction velocity testing. Results & conclusion: The 3D-printed MNAs were shown to have higher gain than microfabricated MNAs at high frequencies. However, the selectivity of the microfabricated MNAs is more than 3D-printed MNAs. Scanning electron microscopy image comparison also showed significant differences between the output of the 3D-printed MNAs and the microfabricated MNAs. It was understood that the microfabricated MNAs’ geometries are closer to the primary design than the 3D-printed MNAs.

scholarly journals AMST: Alignment to Median Smoothed Template for Focused Ion Beam Scanning Electron Microscopy Image Stacks

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Julian Hennies ◽  
José Miguel Serra Lleti ◽  
Nicole L. Schieber ◽  
Rachel M. Templin ◽  
Anna M. Steyer ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Scanning Electron Microscopy Image ◽  
Beam Scanning ◽  
Electron Microscopy Image ◽  
Microscopy Image ◽  
Scanning Electron

Stability and Performance Study of Polyethersulfone Membranes Modified Using Polyelectrolytes

2013 ◽  
Vol 65 (4) ◽  
Author(s):  
Law Yong Ng ◽  
Abdul Wahab Mohammad ◽  
Ching Yin Ng ◽  
Nur Hanis Hayati Hairom
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Research Work ◽  
Performance Study ◽  
Salt Solutions ◽  
Cross Sectional ◽  
And Performance ◽  
Surface Modified ◽  
Lower Contact ◽  
Scanning Electron

In this research work, porous PES membranes were initially pre-heated for certain duration of time and then surface-modified to reject the MgSO4 salt solutions through self-adsorption of polyelectrolytes. From the experimental work, higher membrane salt rejection capability can be obtained when the number of polyelectrolyte bilayers is increased. The images of the cross-sectional morphology of modified and non-modified membranes were obtained using field emission scanning electron microscopy (FESEM). All modified membranes showed relatively lower contact angle values.

Cutting performance comparison of two different diamond segments used in frame saw for granite

2020 ◽  
Author(s):  
Qin Sun ◽  
Jinsheng Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Production Rate ◽  
Cutting Forces ◽  
Normal Force ◽  
Performance Comparison ◽  
Horizontal Force ◽  
Force Ratio ◽  
Wear Tool ◽  
Scanning Electron

A concave segment and a multi-layered segment were employed to cut large granite (size > 2000 mm × 2000 mm × 2000 mm) using diamond frame saw, which can mount 80 – 120 blades (size: 4000 mm × 180 mm × 3.5 mm). Cutting forces were determined by Kistler dynamometer and diamond segments wear was examined by Scanning Electron Microscopy and Keyence microscopy. Sawing performance of segments was evaluated by slab quality, radial wear, cutting force (force ratio) and slab production rate. Compared with multi-layered segments, experimental results showed that concave segments have better slab quality, lower cutting forces and force ratio (normal force/horizontal force), lower radial wear (tool consumption) and higher slab production rate. Experiments indicate that the concave diamond segments are more suitable for diamond frame saw to cut granite.

scholarly journals Scanning electron microscopy image representativeness: morphological data on nanoparticles

2016 ◽  
Vol 265 (1) ◽  
pp. 34-50 ◽  
Author(s):  
KATARZYNA ODZIOMEK ◽  
DANIELA USHIZIMA ◽  
PRZEMYSLAW OBERBEK ◽  
KRZYSZTOF JAN KURZYDŁOWSKI ◽  
TOMASZ PUZYN ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Morphological Data ◽  
Scanning Electron Microscopy Image ◽  
Electron Microscopy Image ◽  
Microscopy Image ◽  
Scanning Electron

scholarly journals The effect of Merpol surfactant on the morphology and performance of PES/PVP membranes: antibiotic separation

2019 ◽  
Vol 10 (4) ◽  
pp. 301-309
Author(s):  
Maryam Omidvar ◽  
Zahra Hejri ◽  
Ahmad Moarefian
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Pure Water ◽  
Water Flux ◽  
Synthetic Wastewater ◽  
Membrane Pores ◽  
Pure Water Flux ◽  
And Performance ◽  
Average Size ◽  
Scanning Electron

Abstract The present study used modified nanofiltration (NF) membranes to remove the emerging contaminant of amoxicillin (AMX) from synthetic wastewater. For this purpose, Merpol surfactant and polyvinylpyrrolidone were added to the casting solutions to prepare flat sheet asymmetric polyethersulfone (PES) NF membranes through phase inversion process. Then, the effect of adding Merpol surfactant at different concentrations on the morphology, hydrophilicity, and pure water flux (PWF) of the membranes, as well as the separation of AMX from aqueous solutions was investigated. The characteristics of the prepared membranes were studied by scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM), contact angle (CA) measurement and performance tests. The obtained results approved the improved hydrophilicity of the PES membranes after adding Merpol surfactant to the casting solution. The findings also revealed a gradual increase in the average size of the membrane pores in sub-layer and thinner top layer, proportional to the increase of surfactant content in the solution. The results also confirmed the increase of PWF under the influence of surfactant increase. As a result, for the membrane containing 8 wt% Merpol additive, the lowest CA (52.08°), the highest PWF (76.31 L/m2 h), and maximum AMX excretion (97%) were achieved.

Scanning Electron Microscopy image analysis of fiber glass insulation

1992 ◽  
Vol 50 (2) ◽  
pp. 994-995
Author(s):  
H. Talbot ◽  
D. Jeulin ◽  
L.W. Hobbs
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Image Analysis ◽  
Glass Fibers ◽  
Insulation Material ◽  
Glass Insulation ◽  
Microscopy Image ◽  
Microscopy Image Analysis ◽  
Environmental Sem ◽  
Scanning Electron

Glass wool, made of chemically bound glass fibers which trap stagnant air, has been used in a variety of applications as phonic and thermic insulation material. Mechanical and insulating qualities of the material depend heavily on the characteristics of the fibers themselves. Aside from the composition of the glass, the length and diameter distributions of the fibers within the material can be related to these characteristics. A fast and reliable means for obtaining these size distributions is therefore a crucial issue for quality control.Scanning electron microscopy (SEM) imaging was used to access sub-micron dimensions of the fibers; and image analysis, as opposed to manual procedures, was used for obtaining measurements.Samples of clean raw fibers (free of binder) were dispersed with ultrasound into a pH 9 aqueous solution and later deposited on a track-etched polycarbonate filter with 0.2 μm pore size. The filter was then dried, coated, and observed in BSE mode in a standard SEM, or left uncoated and observed in an environmental SEM (ESEM).

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