scholarly journals Effect of Silicon, Carbon, and Sulfur on Structure of Liquid Iron and Implications for Structure-Property Relations in Liquid Iron-Light Element Alloys

2018 ◽  
Vol 123 (6) ◽  
pp. 4697-4706 ◽  
Author(s):  
Yuki Shibazaki ◽  
Yoshio Kono
Keyword(s):  
Liquid Iron ◽  
Light Element ◽  
Structure Property ◽  
Property Relations ◽  
Silicon Carbon ◽  
Structure Of Liquid

scholarly journals Ab Initio Thermoelasticity of Liquid Iron-Nickel-Light Element Alloys

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 59 ◽  
Author(s):  
Hiroki Ichikawa ◽  
Taku Tsuchiya
Keyword(s):  
Ab Initio ◽  
Liquid Iron ◽  
Inner Core ◽  
Light Element ◽  
Outer Core ◽  
Light Elements ◽  
Major Element Composition ◽  
Silicon Carbon ◽  
Other Information ◽  
Core Boundary

The earth’s core is thought to be composed of Fe-Ni alloy including substantially large amounts of light elements. Although oxygen, silicon, carbon, nitrogen, sulfur, and hydrogen have been proposed as candidates for the light elements, little is known about the amount and the species so far, primarily because of the difficulties in measurements of liquid properties under the outer core pressure and temperature condition. Here, we carry out massive ab initio computations of liquid Fe-Ni-light element alloys with various compositions under the whole outer core P, T condition in order to quantitatively evaluate their thermoelasticity. Calculated results indicate that Si and S have larger effects on the density of liquid iron than O and H, but the seismological reference values of the outer core can be reproduced simultaneously by any light elements except for C. In order to place further constraints on the outer core chemistry, other information, in particular melting phase relations of iron light elements alloys at the inner core-outer core boundary, are necessary. The optimized best-fit compositions demonstrate that the major element composition of the bulk earth is expected to be CI chondritic for the Si-rich core with the pyrolytic mantle or for the Si-poor core and the (Mg,Fe)SiO3-dominant mantle. But the H-rich core likely causes a distinct Fe depletion for the bulk Earth composition.

scholarly journals Jaws of Platynereis dumerilii: Miniature Biogenic Structures with Hardness Properties Similar to Those of Crystalline Metals

JOM ◽  
2021 ◽  
Author(s):  
Luis Zelaya-Lainez ◽  
Giuseppe Balduzzi ◽  
Olaf Lahayne ◽  
Kyojiro N. Ikeda ◽  
Florian Raible ◽  
...  
Keyword(s):  
Inductively Coupled Plasma ◽  
Indentation Depth ◽  
Organic Matrix ◽  
Structure Property ◽  
Structural Protein ◽  
Inductively Coupled ◽  
Property Relations ◽  
Biogenic Structures ◽  
Platynereis Dumerilii ◽  
Bristle Worms

AbstractNanoindentation, laser ablation inductively coupled plasma mass spectroscopy and weighing ion-spiked organic matrix standards revealed structure-property relations in the microscopic jaw structures of a cosmopolitan bristle worm, Platynereis dumerilii. Hardness and elasticity values in the jaws’ tip region, exceeding those in the center region, can be traced back to more metal and halogen ions built into the structural protein matrix. Still, structure size appears as an even more relevant factor governing the hardness values measured on bristle worm jaws across the genera Platynereis, Glycera and Nereis. The square of the hardness scales with the inverse of the indentation depth, indicating a Nix-Gao size effect as known for crystalline metals. The limit hardness for the indentation depth going to infinity, amounting to 0.53 GPa, appears to be an invariant material property of the ion-spiked structural proteins likely used by all types of bristle worms. Such a metal-like biogenic material is a major source of bio-inspiration.

scholarly journals Hydrogen adsorption on MoS2-surfaces: a DFT study on preferential sites and the effect of sulfur and hydrogen coverage

2017 ◽  
Vol 19 (24) ◽  
pp. 16231-16241 ◽  
Author(s):  
Rasmus Kronberg ◽  
Mikko Hakala ◽  
Nico Holmberg ◽  
Kari Laasonen
Keyword(s):  
Hydrogen Adsorption ◽  
Structural Parameters ◽  
Dft Study ◽  
Structure Property ◽  
Property Relations

H-Adsorption on MoS2-surfaces is studied as a function of structural parameters and an assessment of the intricate structure–property relations is conducted.

scholarly journals Structure–Property Relations in Oligomers of Linear Aliphatic Diisocyanates

2018 ◽  
Vol 6 (8) ◽  
pp. 9753-9759 ◽  
Author(s):  
Max Widemann ◽  
Piet J. Driest ◽  
Patrizio Orecchia ◽  
Frederik Naline ◽  
Florian E. Golling ◽  
...  
Keyword(s):  
Structure Property ◽  
Property Relations

Structure of Liquid Iron at Pressures up to 58 GPa

2004 ◽  
Vol 92 (18) ◽  
Author(s):  
Guoyin Shen ◽  
Vitali B. Prakapenka ◽  
Mark L. Rivers ◽  
Stephen R. Sutton
Keyword(s):  
Liquid Iron ◽  
Structure Of Liquid

scholarly journals Multiblock Copolymers of Norbornene and Cyclododecene: Chain Structure and Properties

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1756
Author(s):  
Yulia I. Denisova ◽  
Georgiy A. Shandryuk ◽  
Marianna P. Arinina ◽  
Ivan S. Levin ◽  
Vsevolod A. Zhigarev ◽  
...  
Keyword(s):  
First Generation ◽  
Average Length ◽  
Chain Structure ◽  
Random Copolymers ◽  
Multiblock Copolymers ◽  
Structure Property ◽  
Reaction Conditions ◽  
Property Relations ◽  
Cross Metathesis

We investigate the structure–property relations of the multiblock copolymers of norbornene with cyclododecene synthesized via the macromolecular cross-metathesis reaction between amorphous polynorbornene and semicrystalline polydodecenamer in the presence of the first-generation Grubbs catalyst. By adjusting the reaction time, catalyst amount, and composition of the initial system, we obtain a set of statistical multiblock copolymers that differ in the composition and average length of norbornene and dodecenylene unit sequences. Structural, thermal, and mechanical characterization of the copolymers with NMR, XRD, DSC (including thermal fractionation by successive self-nucleation and annealing), and rotational rheology allows us to relate the reaction conditions to the average length of crystallizable unit sequences, thicknesses of corresponding lamellas, and temperatures of their melting. We demonstrate that isolated dodecenylene units can be incorporated into crystalline lamellas so that even nearly random copolymers should retain crystallinity. Weak high-temperature endotherms observed in the multiblock copolymers of norbornene with cyclododecene and other cycloolefins could indicate that the corresponding systems are microphase-separated in the melt state.

Sign in / Sign up

Export Citation Format

Share Document