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Abstract

Contamination of the natural environment with petroleum pollution is still a frequent and particularly dangerous phenomenon, thus there is a need to remove these pollutants. Various types of mineral sorbents (silicate minerals, zeolites, perlite, diatomite, clay rocks) are highly valued in remediation processes due to their affordable, big selectivity and high efficiency. However, many sorbents are not resistant to moisture, which limits their use. The hydrophobization process improves the effectiveness of sorbents used in a humid environment. The DAMSORB produced by IM-POL was hydrophobized with a methanolic stearic acid solution. The use of cheap stearic acid as a modifier is economically advantageous. The evaluation of the hydrophobic properties of the modified material was performed on the basis of the results obtained from the tests: water absorption, floating on the water surface and the contact angles were determined. Tests of the sorption of petroleum-derived compounds were performed on the basis of three procedures: in accordance with the technical sheet of the leading producer of hydrophobic sorption materials in Poland, the Westighouse’s method in the oil layer and the Westighouse’s method on a flat surface. The modified sorbent floats on the surface of the water very well. The average value of the contact angle for the modified sample is 104 degrees. Material is super hydrophobic. In the water environment, the hydrophobized samples have a higher absorption capacity in relation to oil contaminations compared to the raw material. Features of the modified sorbent, such as good buoyancy on the water surface, low affinity to water and better absorption of oil from the solution, make it possible to use the material to remove petroleum contamination from water and highly moist surfaces.
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Authors and Affiliations

Elżbieta Vogt
1
ORCID: ORCID
Karolina Topolska
1

  1. AGH University of Science and Technology, Kraków, Poland
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Abstract

The work presents investigation on the water droplet impingement at a substrate with three different surface coating. The experiments are carried out for two temperatures of the surface: 23ºC (room temperature) and -10ºC. The water droplet contact is recorded via ultra-fast camera and simultaneously via fast thermographic camera. The wetting properties are changing for subzero temperatures of substrates.

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Bibliography

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[14] T.G. Myers, J.P.F. Charpin, and C.P. Thompson. Slowly accreting ice due to supercooled water impacting on a cold surface. Physics of Fluids, 14(1):240–256, 2002. doi: 10.1063/1.1416186.
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Authors and Affiliations

Tomasz Lizer
1
Michał Remer
1
Grzegorz Sobieraj
1
Maciej Psarski
2
Daniel Pawlak
2
Grzegorz Celichowski
2

  1. Institute of Aeronautics and Applied Mechanics, Warsaw University of Technology, Poland.
  2. Faculty of Chemistry, Department of Materials Technology and Chemistry, University of Lodz, Poland.
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Abstract

Gadolinium oxide (Gd2O3) is one of the lanthanide rare-earth oxides, which has been extensively studied due to its versatile functionalities, such as a high permittivity, reactivity with moisture, and ionic conductivity, etc. In this work, GdOx thin film was grown by atomic layer deposition using cyclopentadienyl (Cp)-based Gd precursor and water. As-grown GdOx film was amorphous and had a sub-stoichiometric (x ~ 1.2) composition with a uniform elemental depth profile. ~3 nm-thick GdOx thin film could modify the hydrophilic Si substrate into hydrophobic surface with water wetting angle of 70°. Wetting and electrical test revealed that the growth temperature affects the hydrophobicity and electrical strength of the as-grown GdOx film.
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Bibliography

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Authors and Affiliations

Sung Yeon Ryu
1
Hee Ju Yun
1
Min Hwan Lee
2
Byung Joon Choi
1
ORCID: ORCID

  1. Seoul National University of Science and Technology, Department of Material Science and Engineering, Seoul 01811, Korea
  2. University of California Merced, Department of Mechanical Engineering, Merced, California, USA

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