Усиление гидрофобных свойств структур ZnO золотым покрытием

The effect of enhancement the hydrophobic properties of the ensemble of micro- and nanostructures ZnO as a result of coating with gold was discovered. For the first time, it has been shown that coating the ensemble with a micro- and nanoparticle ZnO layer of gold leads to a sharp increase in the wetting edge angle from 145 to 168 ° (water drop volume 5 mm3) and a decrease in the hydrophobicity/hydrophilicity transition time under ultraviolet irradiation. Keywords: ZnO, gold, superhydrophobic.

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FIRST TIME EXPERIENCE OF COLD ATMOSPHERIC PLASMA USE IN MICROBIAL ECZEMA TREATMENT IN A 3-YEAR-OLD CHILD

PEDIATRIA Journal named after G N SPERANSKY ◽

10.24110/0031-403x-2021-100-2-292-295 ◽

2021 ◽

Vol 100 (2) ◽

pp. 292-295

Author(s):

V.N. Korotkiy ◽

◽

M.I. Shemshuk ◽

A.G. Rumyantsev ◽

◽

...

Keyword(s):

Antibiotic Resistance ◽

Ultraviolet Irradiation ◽

Inflammatory Process ◽

Clinical Observation ◽

Bactericidal Effect ◽

Atmospheric Plasma ◽

Cold Atmospheric Plasma ◽

Chronic Inflammatory Process ◽

Time Experience ◽

First Time

Microbial eczema (ME) is a chronic inflammatory process prone to recurrence, the treatment of which is associated with a number of difficulties due to the ever increasing antibiotic resistance of the microorganisms that cause it. Cold atmospheric plasma (CAP), like ultraviolet irradiation, has a pronounced bactericidal effect, but unlike the latter, it does not have undesirable effects on healthy cells. The article presents a clinical observation of the successful use of CAP in the treatment of severe ME in a 3-year-old child.

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Preparation of New Anti-Slip Flooring Coatings: Hydrophobic MMA Floor Coatings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.721.73 ◽

2013 ◽

Vol 721 ◽

pp. 73-76

Author(s):

Shu Le Lin ◽

Hui Hua Cai

Keyword(s):

Electronic Spectroscopy ◽

Dynamic Contact ◽

Contact Angles ◽

Coating Properties ◽

Hydrophobic Properties ◽

X Ray ◽

H Nmr ◽

Potential Applications ◽

Ft Ir ◽

First Time

For the first time, hydrophobic MMA floor coatings were prepared based on the fluorine-containing methacrylic ester copolymers and applied as a new kind of anti-slip flooring coatings. The composition of the synthesized copolymers was characterized by FT-IR and 1H-NMR. The prepared hydrophobic MMA floor coatings were analyzed for their coating properties. The hydrophobic properties of the coatings were characterized by static and dynamic contact angles and X-ray photo-electronic spectroscopy (XPS). Results show that the newly prepared floor coatings are easy to apply and have excellent mechanical and hydrophobic properties, which indicates that the hydrophobic MMA floor coatings have great potential applications in anti-slip flooring coatings.

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The Role of Extensive Margins of Exports in The Great Export Recovery in Germany, 2009/2010

Jahrbücher für Nationalökonomie und Statistik ◽

10.1515/jbnst-2014-0405 ◽

2014 ◽

Vol 234 (4) ◽

Author(s):

Joachim Wagner

Keyword(s):

Sharp Increase ◽

Empirical Investigation ◽

German Economy ◽

Export Dynamics ◽

First Time

SummaryThis paper contributes to the literature by documenting for the first time the contribution of adding (and dropping) goods and destination countries to the sharp increase in exports of goods in the German economy as a whole during the Great Export Recovery in 2009/2010. The empirical investigation finds that firms that exported in both 2009 and 2010 are much more important for the export dynamics than export starters and export stoppers. Firms that increased their exports (and that were the drivers of the export boom) exported on average more goods and to more destination countries in 2009 than firms that decreased their exports, and they increased both extensive margins of exports on average while firms with decreased exports reduced both the number of goods exported and the number of countries exported to.

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Влияние топографических дефектов на супергидрофобные свойства покрытий на основе ZnO

Письма в журнал технической физики ◽

10.21883/pjtf.2020.19.50037.18371 ◽

2020 ◽

Vol 46 (19) ◽

pp. 15

Author(s):

А.Э. Муслимов ◽

А.Ш. Асваров ◽

Н.C. Шабанов ◽

В.М. Каневский

Keyword(s):

Surface Roughness ◽

Surface Morphology ◽

Hydrophobic Properties ◽

Nanometer Range ◽

Edge Angle ◽

Wenzel State ◽

Water Drops

Results of investigation of hydrophobic properties of ZnO coating with different surface morphology are given. It was shown that for the case of ZnO samples with surface roughness in the nanometer range, the Wenzel state is realized, and for microstructured samples - the Сassie state. For a sample with multimodal surface roughness, a superhydrophobic state was achieved with an edge angle of 151 ° and an adhesion operation of 8.82 mJ/m2. It has been demonstrated that the presence of micrometer defects on the surface of superhydrophobic samples leads to instability of the Сassie state, and as the radius of water drops increases, the Сassie-Wenzel transition is realized.

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DEVELOPMENT OF THE COMPOSITION OF ANTI-SPECIFIC COATING

Bulletin of Belgorod State Technological University named after V G Shukhov ◽

10.34031/article_5ce292c95984b4.27808276 ◽

2019 ◽

Vol 4 (5) ◽

pp. 23-27

Author(s):

В. Логанина ◽

Valentina Loganina ◽

С. Кислицына ◽

Svetlana Kislicyna ◽

К. Сергеева ◽

...

Keyword(s):

Contact Angle ◽

Sharp Increase ◽

Acrylic Resin ◽

Silicone Resin ◽

Binder System ◽

Hydrophobic Properties ◽

Chlorinated Polyethylene ◽

Viscosity Increase ◽

The Matrix ◽

High Contact Angle

The information about the composition of the anti-icing coating is provided. The use of acrylic resin A-01 and DEGALAN®, highly chlorinated polyethylene resin HCPE and silicone resin SILRES® MSE 100 as a binder is considered. The regularities of changes in viscosity of the composition depending on volume content of the filler – Aerosil brand R 972 are revealed. It is found that the viscosity increase is insignificant when filling in the range 0<φ<0.012. With further filling (φ>0,012) there is a significant change in the ratio of the volume and membranous phases of the matrix, there is a sharp increase in the viscosity of the composition. The optimal volumetric composition of the filler is established for each type of the resin. It is revealed that the interaction in the filler-filler system prevails over the interaction in the filler-binder system. In assessing the hydrophobic properties, it is found that the coatings have a high contact angle (more than 150°), and the roll-off angle does not exceed 10°, which confirms the presence of superhydrophobicity and assumes anti-icing properties of the coatings. The adhesion of the coating to the substrate estimated by the lattice incision method on the mortar and metal substrates is 1 point. Smooth and clear cuts without chipping and cracking are marked at 4x magnification

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The Influence of Torrefaction Temperature on Hydrophobic Properties of Waste Biomass from Food Processing

Energies ◽

10.3390/en12244609 ◽

2019 ◽

Vol 12 (24) ◽

pp. 4609 ◽

Cited By ~ 8

Author(s):

Arkadiusz Dyjakon ◽

Tomasz Noszczyk ◽

Martyna Smędzik

Keyword(s):

Food Processing ◽

Moisture Absorption ◽

Water Drop ◽

Waste Biomass ◽

Black Currant ◽

Hydrophobic Properties ◽

Orange Peels ◽

Walnut Shells ◽

Pumpkin Seeds ◽

Penetration Time

The annual potential of waste biomass production from food processing in Europe is 16.9 million tonnes. Unfortunately, most of these organic wastes are utilized without the energy gain, mainly due to the high moisture content and the ability to the fast rotting and decomposition. One of the options to increase its value in terms of energy applications is to valorize its properties. Torrefaction process is one of the pre-treatment technology of raw biomass that increases the quality of the fuel, especially in the context of resistance to moisture absorption. However, little is known about the influence of torrefaction temperature on the degree of valorization of some specific waste biomass. The aim of this paper was to analyze the influence of the temperature of the torrefaction on the hydrophobic properties of waste biomass, such as black currant pomace, apple pomace, orange peels, walnut shells, and pumpkin seeds. The torrefaction process was carried out at temperatures of 200 °C, 220 °C, 240 °C, 260 °C, 280 °C, and 300 °C. The hydrophobic properties were analyzed using the water drop penetration time (WDPT) test. The torrefied waste biomass was compared with the raw material dried at 105 °C. The obtained results revealed that subjecting the biomass to the torrefaction process improved its hydrophobic properties. Biomass samples changed their hydrophobic properties from hydrophilic to extremely hydrophobic depending on the temperature of the process. Apple pomace was the most hydrophilic sample; its water drop penetration was under 60 s. Black currant and apple pomaces reached extremely hydrophobic properties at a temperature of 300 °C, only. In the case of orange peels, walnut shells, and pumpkin seeds, already at the temperature of 220 °C, the samples were characterized by severely hydrophobic properties with a penetration time over 1000 s. At the temperature of 260 °C, orange peels, walnut shells, and pumpkin seeds reached extremely hydrophobic properties. Furthermore, in most cases, the increase of torrefaction temperature improved the resistance to moisture absorption, which is probably related to the removal of hydroxyl groups and structural changes occurring during this thermal process.

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Sharp Increase in Eating Disorders among University Students since the COVID-19 Pandemic

Nutrients ◽

10.3390/nu13103415 ◽

2021 ◽

Vol 13 (10) ◽

pp. 3415

Author(s):

Marie-Pierre Tavolacci ◽

Joel Ladner ◽

Pierre Déchelotte

Keyword(s):

Eating Disorders ◽

University Students ◽

Sharp Increase ◽

Eating Habits ◽

Early Screening ◽

Cross Sectional ◽

Targeted Interventions ◽

Cross Sectional Studies ◽

First Time ◽

Scoff Questionnaire

The COVID-19 pandemic has caused stress as well as modified physical activity and eating habits among university students. The objectives were to identify the changes in body mass index (BMI) and eating disorders among university students between 2009 and 2021. Between 2009 and 2021, five repeated cross-sectional studies were conducted among university students who filled in an anonymous online self-questionnaire. Age, gender, and BMI were recorded, and the SCOFF questionnaire was used for ED screening which, in combination with BMI, allows to identify the four broad categories of ED with the Expali algorithm. With the five studies, 8981 university students were included in total. Obesity steadily increased between 2009 and 2021, for both men and women. The prevalence of ED was stable between 2009 and 2018 and significantly increased from 31.8% in 2018 to 51.8% in 2021 for women (p trend < 0.0001), and from 13.0% in 2009 to 31.3% in 2021 for men (p trend < 0.0001). All types of ED increased significantly between 2009 and 2021, except for restrictive ED among men. These results indicate for the first time a significant increase in ED prevalence among students since the COVID-19 pandemic. Initiatives to reinforce early screening of ED to implement targeted interventions in the student population are urgently needed.

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Impact of Chitosan on Water Stability and Wettability of Soils

Materials ◽

10.3390/ma14247724 ◽

2021 ◽

Vol 14 (24) ◽

pp. 7724

Author(s):

Agnieszka Adamczuk ◽

Milena Kercheva ◽

Mariana Hristova ◽

Grzegorz Jozefaciuk

Keyword(s):

Molecular Mass ◽

Water Drop ◽

Soil Aggregates ◽

Water Stability ◽

Soil Environment ◽

Deacetylation Degree ◽

Lower Viscosity ◽

Lower Molecular Mass ◽

C And N ◽

First Time

Chitosan has become increasingly applied in agriculture worldwide, thus entering the soil environment. We hypothesized that chitosan should affect the water stability of soil. Since this problem has not been studied to date, we examined, for the first time, the influence of chitosan on the water stability and wettability of soil aggregates. The aggregates were prepared from four soils with various properties amended with different amounts of two kinds of powdered chitosan, and subjected to 1 and/or 10 wetting–drying cycles. The water stability was measured by monitoring air bubbling after aggregate immersion in water, and the wettability was measured by a water drop penetration test. The biopolymer with a lower molecular mass, lower viscosity, and higher degree of deacetylation was more effective in increasing the water stability of the soil than the biopolymer with a higher molecular mass, higher viscosity, and lower deacetylation degree. After a single wetting-drying cycle, the water stability of the soil aggregates containing chitosan with a higher molecular mass was generally lower than that of the soil; after ten wetting–drying cycles, the water stability increased 1.5 to 20 times depending on the soil. The addition of low-molecular-mass chitosan after a single wetting-drying cycle caused the water stability to become one to two hundred times higher than that of the soil. A trial to find out which soil properties (pH, C and N content, bulk density, porosity, and particle size distribution) are responsible for the effectiveness of chitosan action was not successful, and this will be the objective of further studies.

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Investigation of Nanohydrophobic Sand as an Insulating Layer for Cultivation of Plants in Soils Contaminated with Heavy Metals

Eurasian Chemico-Technological Journal ◽

10.18321/ectj507 ◽

2017 ◽

Vol 19 (1) ◽

pp. 91 ◽

Cited By ~ 1

Author(s):

M. Myrzabaeva ◽

Z. Insepov ◽

K. Boguspaev ◽

D. Faleev ◽

M. Nazhipkyzy ◽

...

Keyword(s):

Heavy Metals ◽

Lower Layer ◽

Hydrophobic Effect ◽

Beach Sand ◽

Hydrophobic Properties ◽

River Sand ◽

Insulating Layer ◽

Pure Silica ◽

Amaranthus Paniculatus ◽

First Time

The paper presents the results of laboratory experiments to test hydrophobic sand, on the basis of soot as an insulating for growing plants-hyperaccumulators heavy metals ? amaranth (Amaranthus paniculatus) and sunflower (Helianthus annuus) plants. For the first time in agriculture hydrophobic sand was used for the irrigation of water-saving experiments for growing palms in arid areas of the UAE. The hydrophobic sand was obtained from normal beach sand, which is covered by small particles of pure silica, pretreated pairs trimethylhydroxysilane, (CH3)3SiOH. After this treatment, the outer shell grains saturated groups of compounds insoluble in water, sand and exposes hydrophobic properties. Thus obtained nanohydrophobic sand is considered to be physiologically safe for plants and supplied by the manufacturer with 30-year warranty of the hydrophobic effect. In our experiments we used the conventional washed river sand, as adhesive bases used polyurethane glue SD-600 is dissolved in ethyl acetate. The sand thus obtained is added 1% superhydrophobic soot. The sand is obtained by using carbon black becomes hydrophobic properties, does not transmit moisture, it has virtually no adverse effect on plant growth. To test hydrophobic sand used plastic pots (volume 1 l). The lower layer of the moistened soil-ground containing various concentrations of heavy metals (TM), the next separation layer ? nanohydrophobic sand, and the top layer ? a layer of fertile soil enriched vermicompost for growing plants. When watering plants nanohydrophobic sand layer retains water and prevents migration of TM (Zn, Cd, Cu) of the lower contaminated layer to the upper, the mold.

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