scholarly journals Oxyhydroxide of metallic nanowires in a molecular H2O and H2O2 environment and their effects on mechanical properties

2018 ◽  
Vol 20 (25) ◽  
pp. 17289-17303 ◽  
Author(s):  
Gurcan Aral ◽  
Md Mahbubul Islam ◽  
Yun-Jiang Wang ◽  
Shigenobu Ogata ◽  
Adri C. T. van Duin
Keyword(s):  
Mechanical Properties ◽  
Environmental Conditions ◽  
Metallic Iron ◽  
Oxidation Process ◽  
Mechanical Failure ◽  
Metallic Nanowires

To avoid unexpected environmental mechanical failure, there is a strong need to fully understand the details of the oxidation process and intrinsic mechanical properties of reactive metallic iron (Fe) nanowires (NWs) under various aqueous reactive environmental conditions.

Atomic-scale investigation of the effect of surface carbon coatings on the oxidation and mechanical properties of iron nanowires

2021 ◽  
Author(s):  
Gurcan Aral ◽  
Md Mahbubul Islam
Keyword(s):  
Mechanical Properties ◽  
Oxidation Process ◽  
Atomic Scale ◽  
Carbon Coatings ◽  
Surface Carbon ◽  
Iron Nanowires ◽  
Effect Of Surface

The understanding of the complex atomistic-scale mechanisms of the oxidation process of carbon (C) coated iron nanowires (Fe NW) and also the resulting modulation of mechanical properties is a highly challenging task.

Endless skies and open seas – how birds and fish navigate

Neuroforum ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Lisa Spiecker ◽  
Bo Leberecht ◽  
Corinna Langebrake ◽  
Malien Laurien ◽  
Shambhavi Rajendra Apte ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnetic Fields ◽  
Home Range ◽  
Environmental Conditions ◽  
Geomagnetic Field ◽  
Visual Cues ◽  
Quantum Mechanical ◽  
The Sun ◽  
Seasonal Migrations ◽  
Research Questions

Abstract Every year, billions of animals leave their home range and start seasonal migrations in order to find more favorable resources and to escape harsh environmental conditions. These round trips often span thousands of kilometers. To successfully navigate along their route, animals rely on various external references. While landmarks and celestial cues like stars or the sun are easy to imagine as guidance on these journeys, using the geomagnetic field for orientation is more elusive. The geomagnetic field is an omnipresent cue, which can be sensed and relied upon by many animals, even when visual cues are sparse. How magnetic fields can be perceived seems to vary between birds and fish. While birds seem to use a mechanism based on the quantum mechanical properties of electron spins, fish may have evolved a compass similar in its function to the technical devises developed by humans. How these mechanisms work precisely and how they are integrated are research questions addressed in SFB 1372.

scholarly journals Molecular dynamics simulations of mechanical failure in polymorphic arrangements of amyloid fibrils containing structural defects

2013 ◽  
Vol 4 ◽  
pp. 429-440 ◽  
Author(s):  
Hlengisizwe Ndlovu ◽  
Alison E Ashcroft ◽  
Sheena E Radford ◽  
Sarah A Harris
Keyword(s):  
Mechanical Properties ◽  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Amyloid Fibrils ◽  
Amyloid Fibril ◽  
Steered Molecular Dynamics ◽  
Mechanical Failure ◽  
Structural Defects ◽  
Dynamics Simulations

We examine how the different steric packing arrangements found in amyloid fibril polymorphs can modulate their mechanical properties using steered molecular dynamics simulations. Our calculations demonstrate that for fibrils containing structural defects, their ability to resist force in a particular direction can be dominated by both the number and molecular details of the defects that are present. The simulations thereby suggest a hierarchy of factors that govern the mechanical resilience of fibrils, and illustrate the general principles that must be considered when quantifying the mechanical properties of amyloid fibres containing defects.

scholarly journals Zn- or Cu-Containing CaP-Based Coatings Formed by Micro-arc Oxidation on Titanium and Ti-40Nb Alloy: Part I—Microstructure, Composition and Properties

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4116 ◽  
Author(s):  
Ekaterina G. Komarova ◽  
Yurii P. Sharkeev ◽  
Mariya B. Sedelnikova ◽  
Konstantin A. Prosolov ◽  
Igor A. Khlusov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Adhesive Strength ◽  
Applied Voltage ◽  
Oxidation Process ◽  
Pure Titanium ◽  
Atomic Ratio ◽  
Linear Increase ◽  
Microcrystalline Structure ◽  
Micro Arc Oxidation ◽  
Alloy Part

Zn- and Cu-containing CaP-based coatings, obtained by micro-arc oxidation process, were deposited on substrates made of pure titanium (Ti) and novel Ti-40Nb alloy. The microstructure, phase, and elemental composition, as well as physicochemical and mechanical properties, were examined for unmodified CaP and Zn- or Cu-containing CaP coatings, in relation to the applied voltage that was varied in the range from 200 to 350 V. The unmodified CaP coatings on both types of substrates had mainly an amorphous microstructure with a minimal content of the CaHPO4 phase for all applied voltages. The CaP coatings modified with Zn or Cu had a range from amorphous to nano- and microcrystalline structure that contained micro-sized CaHPO4 and Ca(H2PO4)2·H2O phases, as well as nano-sized β-Ca2P2O7, CaHPO4, TiO2, and Nb2O5 phases. The crystallinity of the formed coatings increased in the following order: CaP/TiNb < Zn-CaP/TiNb < Cu-CaP/TiNb < CaP/Ti < Zn-CaP/Ti < Cu-CaP/Ti. The increase in the applied voltage led to a linear increase in thickness, roughness, and porosity of all types of coatings, unlike adhesive strength that was inversely proportional to an increase in the applied voltage. The increase in the applied voltage did not affect the Zn or Cu concentration (~0.4 at%), but led to an increase in the Ca/P atomic ratio from 0.3 to 0.7.

Printing of Microscale Nanotwinned Copper Interconnections Using Localized Pulsed Electrodeposition (L-PED)

2018 ◽  
Author(s):  
Ali Behroozfar ◽  
Soheil Daryadel ◽  
S. Reza Morsali ◽  
Rodrigo A. Bernal ◽  
Majid Minary-Jolandan
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Additive Manufacturing ◽  
High Resistance ◽  
Environmental Conditions ◽  
Coarse Grained ◽  
Post Processing ◽  
Manufacturing Technique ◽  
Conductive Substrate ◽  
Pulsed Electrodeposition

Nanotwinned (nt) metals exhibit superior electrical and mechanical properties compared to their coarse-grained and nano-grained counterparts. They have a unique microstructure with grains that contain layered nanoscale twins divided by coherent twin boundaries (TBs). Since nanotwinned metals have low electrical resistivity and high resistance to electromigration, they are ideal materials for making nanowires, interconnections and switches. In this paper we show the possibility of making nanotwinned copper interconnections on a non-conductive substrate using a novel additive manufacturing technique called L-PED. Through this approach, microscale interconnections can be directly printed on the substrate in environmental conditions and without post processing.

The effects of environmental conditions on the mechanical properties of jute yarns

2020 ◽  
Vol 30 ◽  
pp. 860-864
Author(s):  
Y. Ben Smail ◽  
A. El Moumen ◽  
A. Imad ◽  
F. Lmai ◽  
H. Elminor
Keyword(s):  
Mechanical Properties ◽  
Environmental Conditions

Degradation Behaviour of Nanosilica Enhanced Oil Palm Empty Fruit Bunch Fiber Epoxy Composites

2020 ◽  
Vol 305 ◽  
pp. 28-35
Author(s):  
Anslem Wong Tsu An ◽  
Sujan Debnath ◽  
Vincent Lee Chieng Chen ◽  
Moola Mohan Reddy ◽  
Alokesh Pramanik
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Oil Palm ◽  
Environmental Conditions ◽  
Natural Fiber ◽  
Fiber Composites ◽  
Epoxy Composites ◽  
Empty Fruit Bunch ◽  
Degradation Behaviour ◽  
Brine Solution

In recent years, studies regarding natural fiber reinforced composites have been increased as they are biodegradable with good mechanical performance therefore can help to overcome the environmental issue. As the natural fibers are easy to obtain, many industries have started to make use of natural fiber composites which are light in weight and possess good mechanical properties. However, the natural fiber composites also possess certain limitations most importantly their high moisture absorption ability which makes them incompatible at degradable environment. The fiber constituents of natural fiber composite may have different type of interactions at different environmental conditions. In addition, the involvement of nanoparticles in the composite may be the solution to overcome the deficiencies. In this research, the degradation behaviour of Oil palm empty fruit bunch (OPEFB) fibers reinforced epoxy composites upon exposure to degradable environmental conditions and the effect of adding nanoparticles have been studied. The tensile tests were conducted before and after the exposure to different environmental conditions including plain water, moist soil, brine solution, and cooking oil. Results shows that the addition of 10wt% of OPEFB fiber to the epoxy composites had improved the mechanical tensile strength up to 15.97% and composites exposed to brine solution have the most prominent sign of degradation in mechanical properties in both composites with and without nanosilica. Nevertheless, the composites with nanosilica have shown up to 24.28% improvement in tensile strength after exposure to different environmental conditions. The improvement were attributed due to filling the voids of the composites with nanosilica and good interfacial adhesion between the nanofiller, fiber, and matrix.

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