scholarly journals Hydrophobic coatings based on SiO2

2013 ◽  
Vol 12 (4) ◽  
pp. 257-267
Author(s):  
Katarzyna Porębska
Keyword(s):  
Silicon Dioxide ◽  
Optical System ◽  
Building Industry ◽  
Water Molecules ◽  
Great Resistance ◽  
Hydrophobic Coatings ◽  
Effect Of Water ◽  
Abrasive Action

The method of conversion, properties and usage of hydrophobic coatings on the bases of silicon dioxide is presented in the article. These layers are formed by use the silanes which are not react with water. What is more, these layers could provide not only great resistance to the effect of water molecules, but also better resistance to the effect of abrasive action and hardness as well as keeping the top stair of the transparency. Uncomplicated methods such as zol-zel are used to settling these layers. There are methods of putting on the various surfaces, without necessity of usage specific and sophisticated technological solutions. As a transparent and simple to keep in the cleanness surfaces these layers found application in various field such as sport, motorization, building industry, optical system whether in our houses.

Notable effect of water on excess electron attachment to aqueous DNA deoxyribonucleosides

2019 ◽  
Vol 21 (17) ◽  
pp. 8925-8932 ◽  
Author(s):  
Yan Zhang ◽  
Jiayue Wang ◽  
Songqiu Yang
Keyword(s):  
Electron Attachment ◽  
Excess Electron ◽  
Water Molecules ◽  
Effect Of Water ◽  
Notable Effect ◽  
Excess Electrons

As excess electrons are vertically attached to aqueous deoxyribonucleosides, ∼50% of excess electrons would be delocalized over the water molecules.

scholarly journals Water Absorption and Hygrothermal Aging Behavior of Wood-Polypropylene Composites

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 782 ◽  
Author(s):  
Wei Wang ◽  
Xiaomin Guo ◽  
Defang Zhao ◽  
Liu Liu ◽  
Ruiyun Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Absorption ◽  
Natural Fiber ◽  
Glass Fibers ◽  
Diffusion Constant ◽  
Water Molecules ◽  
Wood Powder ◽  
Polypropylene Composites ◽  
Effect Of Water ◽  
Composite Samples

Environmentally sound composites reinforced with natural fibers or particles interest many researchers and engineers due to their great potential to substitute the traditional composites reinforced with glass fibers. However, the sensitivity of natural fiber-reinforced composites to water has limited their applications. In this paper, wood powder-reinforced polypropylene composites (WPCs) with various wood content were prepared and subjected to water absorption tests to study the water absorption procedure and the effect of water absorbed in the specimens on the mechanical properties. Water soaking tests were carried out by immersion of composite specimens in a container of distilled water maintained at three different temperatures, 23, 60 and 80 °C. The results showed that the moisture absorption content was related to wood powder percentage and they had a positive relationship. The transfer process of water molecules in the sample was found to follow the Fickian model and the diffusion constant increased with elevated water temperature. In addition, tensile and bending tests of both dry and wet composite samples were conducted and the results indicated that water absorbed in composite specimens degraded their mechanical properties. The tensile strength and modulus of the composites reinforced with 15, 30, 45 wt % wood powder decreased by 5.79%, 17.2%, 32.06% and 25.31%, 33.6%, 47.3% respectively, compared with their corresponding dry specimens. The flexural strength and modulus of the composite samples exhibited a similar result. Furthermore, dynamic mechanical analysis (DMA) also confirmed that the detrimental effect of water molecules on the composite specimens.

scholarly journals Controlling the thermal switching in upconverting nanoparticles through surface chemistry

Nanoscale ◽  
2021 ◽  
Vol 13 (38) ◽  
pp. 16267-16276
Author(s):  
Eduardo D. Martínez ◽  
Alí F. García-Flores ◽  
Albano N. Carneiro Neto ◽  
Carlos D. S. Brites ◽  
Luís D. Carlos ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Upconversion Nanoparticles ◽  
Water Molecules ◽  
Thermal Dynamics ◽  
Quenching Effect ◽  
Effect Of Water ◽  
Thermal Switching

The surface chemistry of upconversion nanoparticles can effectively control the quenching effect of water molecules affecting the thermal dynamics of luminescence.

The Effect of Water on Proton Transfer in Pyrazole

1977 ◽  
Vol 32 (11-12) ◽  
pp. 891-893 ◽  
Author(s):  
V. N. Babin ◽  
E. B. Zavelovich ◽  
Yu. A. Belousov
Keyword(s):  
Transition Metal ◽  
Proton Transfer ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Water Molecules ◽  
Effect Of Water ◽  
Rearrangement Effect

Abstract An NMR 13C study has shown that proton rearrangement in pyrazole is decreased by adding small amounts of water to the sample. Single water molecules as coordination centres pertrub the mechanism of cooperative proton transfer occurring in pyrazole selfassociates. The decrease of the rearrangement effect due to water is similar to the action of transition metal ions studied by the authors earlier.

Clustering of water molecules in aqueous solutions: Effect of water–solute interaction

2004 ◽  
Vol 6 (8) ◽  
pp. 1982-1987 ◽  
Author(s):  
Ivan Brovchenko ◽  
Alfons Geiger ◽  
Alla Oleinikova
Keyword(s):  
Aqueous Solutions ◽  
Water Molecules ◽  
Effect Of Water ◽  
Solute Interaction
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