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.

scholarly journals Effect of Particle Size and Surface Chemistry of Photon‐Upconversion Nanoparticles on Analog and Digital Immunoassays for Cardiac Troponin

2021 ◽  
pp. 2100506
Author(s):  
Julian C. Brandmeier ◽  
Kirsti Raiko ◽  
Zdeněk Farka ◽  
Riikka Peltomaa ◽  
Matthias J. Mickert ◽  
...  
Keyword(s):  
Particle Size ◽  
Surface Chemistry ◽  
Cardiac Troponin ◽  
Upconversion Nanoparticles ◽  
Effect Of Particle Size

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.

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