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.

The HAlF4 superacid fragmentation induced by an excess electron attachment

2015 ◽  
Vol 17 (29) ◽  
pp. 19194-19201 ◽  
Author(s):  
Marcin Czapla ◽  
Piotr Skurski
Keyword(s):  
Electron Attachment ◽  
Excess Electron

The HAlF4 superacid binds an excess electron and undergoes a spontaneous fragmentation that leads to a H atom and an AlF4− superhalogen anion.

GROUND-STATE DIPOLE-BOUND ANIONS

1996 ◽  
Vol 10 (12) ◽  
pp. 1339-1395 ◽  
Author(s):  
CHARLES DESFRANÇOIS ◽  
HASSAN ABDOUL-CARIME ◽  
JEAN-PIERRE SCHERMANN
Keyword(s):  
Ground State ◽  
Dipole Moments ◽  
Electron Attachment ◽  
Geometrical Structures ◽  
Excess Electrons ◽  
Low Energy Electrons ◽  
Small Clusters ◽  
Molecular Frame ◽  
Selection Of

Ground-state dipole-bound anions are fragile molecular species which excess electrons are almost entirely located in a very diffuse orbital outside the molecular frame. They can be created by attachment of very low energy electrons to polar molecules or small clusters which dipole moments are larger than a practical critical value of 2.5 D. They present analogies with Rydberg atoms and their geometrical structures are nearly identical to those of their neutral parents. Experimentally, dipole-binding of electrons to polar systems is a non-perturbative and reversible ionization process, in contrast with conventional valence-binding. Examples of applications such as mass-spectrometric isomer selection of clusters or determination of electron attachment properties of isolated nucleic acid bases are given.

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.

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