Robust superhydrophobic and oleophilic silk fibers for selective removal of oil from water surfaces

RSC Advances ◽  
2016 ◽  
Vol 6 (77) ◽  
pp. 73660-73667 ◽  
Author(s):  
Manoj Patowary ◽  
Khanindra Pathak ◽  
Rajakumar Ananthakrishnan
Keyword(s):  
Water Surface ◽  
Selective Removal ◽  
Oil Removal ◽  
Silk Fibers ◽  
Water Surfaces

Superhydrophobic silk fibers have been developed from silk cocoons as a potential sorbent for selective oil removal from a water surface.

scholarly journals Application of modified ash-tree sawdust for oil removal from water surfaces

2021 ◽  
Vol 699 (1) ◽  
pp. 012031
Author(s):  
I Ya Sippel ◽  
G A Akhmetgaleeva ◽  
K A Magdin
Keyword(s):  
Oil Removal ◽  
Water Surfaces

scholarly journals SAR-Based Flood Monitoring for Flatland with Frequently Fluctuating Water Surfaces: Proposal for the Normalized Backscatter Amplitude Difference Index (NoBADI)

2021 ◽  
Vol 13 (20) ◽  
pp. 4136
Author(s):  
Hiroto Nagai ◽  
Takahiro Abe ◽  
Masato Ohki
Keyword(s):  
Water Surface ◽  
Synthetic Aperture ◽  
Sar Image ◽  
Sar Images ◽  
Simple Method ◽  
Multiple Images ◽  
Amplitude Difference ◽  
The Us ◽  
Water Surfaces ◽  
L Band

Space-based synthetic aperture radar (SAR) is a powerful tool for monitoring flood conditions over large areas without the influence of clouds and daylight. Permanent water surfaces can be excluded by comparing SAR images with pre-flood images, but fluctuating water surfaces, such as those found in flat wetlands, introduce uncertainty into flood mapping results. In order to reduce this uncertainty, a simple method called Normalized Backscatter Amplitude Difference Index (NoBADI) is proposed in this study. The NoBADI is calculated from a post-flood SAR image of backscatter amplitude and multiple images on non-flooding conditions. Preliminary analysis conducted in the US state of Florida, which was affected by Hurricane Irma in September 2017, shows that surfaces frequently covered by water (more than 20% of available data) have been successfully excluded by means of C-/L-band SAR (HH, HV, VV, and VH polarizations). Although a simple comparison of pre-flood and post-flood images is greatly affected by the spatial distribution of the water surface in the pre-flood image, the NoBADI method reduces the uncertainty of the reference water surface. This advantage will contribute in making quicker decisions during crisis management.

THE CYCLONET: A DEVICE FOR PICKING UP OIL SLICKS FROM THE SEA SURFACE

1975 ◽  
Vol 1975 (1) ◽  
pp. 387-394 ◽  
Author(s):  
Jacques Pichon
Keyword(s):  
Water Surface ◽  
Contemporary Problem ◽  
High Efficiency ◽  
Liquid Mixture ◽  
Sea Surface ◽  
Remedial Action ◽  
Power Requirement ◽  
Water Conditions ◽  
Water Surfaces ◽  
Rich Liquid

ABSTRACT Removal of liquid pollutants accidentally released onto water surface is a serious contemporary problem. Efficient remedial action requires that well-designed, reliable equipment be brought to the scene in a matter of hours and that a pollutant-rich liquid mixture be quickly recovered however uncongenial the prevailing weather and water conditions may be. Alsthom-Techniques des Fluides has developed a simple item of equipment for recovering oil slicks from water surfaces, the CYCLONET. Principal features are:a. ready for action at short noticeb. high efficiency: mixture removed contains 80–100% pollutantc. uncomplicated design with no moving parts below water surfaced. operates in rough watere. adaptable to various types of craftf. boat engine the only power requirement.

scholarly journals The achaete–scute complex contains a single gene that controls bristle development in the semi-aquatic bugs

2018 ◽  
Vol 285 (1892) ◽  
pp. 20182387 ◽  
Author(s):  
Cédric Finet ◽  
Amélie Decaras ◽  
David Armisén ◽  
Abderrahman Khila
Keyword(s):  
Surface Tension ◽  
Body Weight ◽  
Rna Interference ◽  
Water Surface ◽  
Single Gene ◽  
Pivotal Role ◽  
Water Striders ◽  
Functional Efficiency ◽  
Water Surfaces ◽  
Aquatic Bugs

The semi-aquatic bugs (Heteroptera, Gerromorpha) conquered water surfaces worldwide and diversified to occupy puddles, ponds, streams, lakes, mangroves and even oceans. Critical to this lifestyle is the evolution of sets of hairs that allow these insects to maintain their body weight on the water surface and protect the animals against wetting and drowning. In addition, the legs of these insects are equipped with various grooming combs that are important for cleaning and tidying the hair layers for optimal functional efficiency. Here we show that the hairs covering the legs of water striders represent innervated bristles. Genomic and transcriptomic analyses revealed that in water striders the achaete–scute complex, known to control bristle development in flies, contains only the achaete–scute homologue ( ASH ) gene owing to the loss of the gene asense. Using RNA interference, we show that ASH plays a pivotal role in the development of both bristles and grooming combs in water striders. Our data suggest that the ASH locus may have contributed to the adaptation to water surface lifestyle through shaping the hydrophobic bristles that prevent water striders from wetting and allow them to exploit water surface tension.

Facile preparation of Fe3O4@C/Cu core-shell sub-micron materials for oil removal from water surface

2019 ◽  
Vol 466 ◽  
pp. 483-489 ◽  
Author(s):  
Taiqi Liu ◽  
Zhijie Li ◽  
Guimei Shi ◽  
Qian Zhao ◽  
Xu Chen ◽  
...  
Keyword(s):  
Water Surface ◽  
Core Shell ◽  
Oil Removal ◽  
Facile Preparation

scholarly journals RESEARCH OF EFFECTIVENESS OF DISK SHAPED ELEMENTS FOR OIL REMOVAL / DISKINIŲ NAFTOS SURINKIMO ELEMENTŲ EFEKTYVUMO TYRIMAS

2016 ◽  
Vol 7 (6) ◽  
pp. 624-627
Author(s):  
Robertas Andrulionis ◽  
Ieva Švagždytė
Keyword(s):  
Inclination Angle ◽  
Water Surface ◽  
Rotation Speed ◽  
Oil Removal ◽  
Industrial Oil ◽  
Disc Rotation ◽  
Disc Rotation Speed ◽  
Analysis Of Results

Influence of grooved disc rotation speed and inclination angle of fluid from surface on amount of removed liquid, was studied in this article. Stand with possibility to change disc, rotation speed of disc and angle was designed and assembled. U and V shaped groove discs were used. Edible and industrial oil SAE 80W90 were removed from water surface and collected into the flash. Optimal disc rotation speed, which is 15 rpm and disc inclination angle 00 were determined after analysis of results. Straipsnyje išnagrinėta skirtingais griovėtais diskais nuo vandens paviršiaus surenkamo skysčio ir jame esančio vandens kiekio priklausomybė nuo griovėto disko sukimosi greičio ir polinkio kampo. Buvo suprojektuotas stendas su galimybėmis pakeisti diską, disko sukimosi greičius bei polinkio kampą. Naudotų diskų griovelių geometrija V ir U formos. Nuo vandens paviršiaus disku buvo renkamas maistinis aliejus ir tepalai 80W90 į sugraduotą kolbą. Atlikus gautų rezultatų analizę, nustatytas optimalus disko sukimosi greitis, kuris lygus 15 aps/min, o polinkio kampas lygus 0°.

The Impact of Surface Contamination on the Flow Beneath Wind-Generated Waves

2007 ◽  
Author(s):  
Kamran Siddiqui ◽  
Mark R. Loewen
Keyword(s):  
Water Surface ◽  
Flow Characteristics ◽  
Streamwise Velocity ◽  
Viscous Sublayer ◽  
Contaminated Water ◽  
Near Surface ◽  
Water Surface Temperature ◽  
Water Surfaces ◽  
The Mean ◽  
The Impact

We report on an experimental study conducted to investigate flow characteristics in the near-surface layer beneath clean and surfactant-contaminated water surfaces in the presence of wind. The two-dimensional velocity field beneath the water surface was measured using particle image velocimetry. The water surface temperature measurements were made simultaneously using infrared imagery. The results show the existence of the viscous sublayer beneath both clean and contaminated water surfaces. Within the viscous sublayer in contaminated water, the mean streamwise velocity is 25–30% larger and the mean streamwise velocity gradients are more than a factor of two larger compared to that beneath clean water surfaces.

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