Use of Coaxial-Cylinder Viscometers and Capillary-Tube Viscometers for Suspensions

Spontaneous emergence of chirality is a pervasive theme in soft matter. We report a transient twist forming in achiral nematic liquid crystals confined to a capillary tube with square cross...

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A computational technique for thermal analysis in coaxial cylinder of one-dimensional flow of fractional Oldroyd-B nanofluid

International Journal of Ambient Energy ◽

10.1080/01430750.2021.1939157 ◽

2021 ◽

pp. 1-17

Author(s):

K. A. Abro ◽

A. Atangana

Keyword(s):

Thermal Analysis ◽

Coaxial Cylinder ◽

Computational Technique ◽

One Dimensional ◽

Dimensional Flow

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Capillary Effect Enhancement in a Plastic Capillary Tube by Nanostructured Surface

Polymers ◽

10.3390/polym13040628 ◽

2021 ◽

Vol 13 (4) ◽

pp. 628

Author(s):

Kazuma Kurihara ◽

Ryohei Hokari ◽

Naoki Takada

Keyword(s):

Plasma Treatment ◽

Capillary Tube ◽

Capillary Effect ◽

Nanostructured Surface ◽

Nanostructure Fabrication ◽

Wetting Properties ◽

Treatment Processes ◽

Standard Solution ◽

The Cost ◽

Plastic Surfaces

We investigated the enhancement of the capillary effect in a plastic capillary tube using only a nanostructured surface. Since plastic is a hydrophobic material, the capillary effect does not emerge without an additional coating or plasma treatment process. Therefore, capillary effect enhancement by the nanostructure fabrication method is expected to reduce the cost and minimise the contamination produced in the human body. By combining a hydrophilic nylon resin and a nanostructure at the tip of the plastic pipette, we could confirm that the capillary effect was produced solely by the tube fabrication process. The produced capillary effect increased linearly with increasing nanostructure height when a standard solution with a surface tension of 70 mN·m−1 was used. Thus, we can conclude that including the plastic part with nanostructure can be useful for biomedical applications. In addition, we suggest that the proposed method is highly effective in controlling the wetting properties of plastic surfaces, compared to the typical coating or plasma treatment processes.

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Remote, Long-Pathlength Cell for High-Sensitivity Raman Spectroscopy

Applied Spectroscopy ◽

10.1366/0003702874868089 ◽

1987 ◽

Vol 41 (1) ◽

pp. 126-130 ◽

Cited By ~ 60

Author(s):

Scott D. Schwab ◽

Richard L. McCreery

Keyword(s):

Fiber Optics ◽

Laser Light ◽

Capillary Tube ◽

High Sensitivity ◽

Sample Tube ◽

Increased Sensitivity ◽

Sampling Systems ◽

Power Densities ◽

Objective Being ◽

Focused Beam

Fiber optics were used to interface a Raman spectrometer to a long (1 m) sample tube, with the objective being increased sensitivity. Internal reflection of the laser light and the Raman scatter within the sample tube permitted a long solution length to be sampled, increasing the Raman sensitivity by factors of 30–50 over conventional capillary tube sampling systems. In addition, the sample was subjected to much lower power densities than with systems employing a focused beam, thus minimizing radiation damage. Detection limits of 10−9 to 10−8 M were achieved for resonance Raman scatterers, and normal Raman scatterers could be detected at the 1 × 10−5 M level.

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