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 Ultrahigh-field 67Zn NMR reveals short-range disorder in zeolitic imidazolate framework glasses

Science ◽  
2020 ◽  
Vol 367 (6485) ◽  
pp. 1473-1476 ◽  
Author(s):  
Rasmus S. K. Madsen ◽  
Ang Qiao ◽  
Jishnu Sen ◽  
Ivan Hung ◽  
Kuizhi Chen ◽  
...  
Keyword(s):  
Short Range ◽  
Structural Parameters ◽  
Metal Organic Framework ◽  
Tetrahedral Site ◽  
Resonance Spectroscopy ◽  
Structure Property ◽  
Zeolitic Imidazolate Framework ◽  
Ultrahigh Field ◽  
Property Relations ◽  
Metal Organic

The structure of melt-quenched zeolitic imidazole framework (ZIF) glasses can provide insights into their glass-formation mechanism. We directly detected short-range disorder in ZIF glasses using ultrahigh-field zinc-67 solid-state nuclear magnetic resonance spectroscopy. Two distinct Zn sites characteristic of the parent crystals transformed upon melting into a single tetrahedral site with a broad distribution of structural parameters. Moreover, the ligand chemistry in ZIFs appeared to have no controlling effect on the short-range disorder, although the former affected their phase-transition behavior. These findings reveal structure-property relations and could help design metal-organic framework glasses.

Hydrogen adsorption on Ge52-, Ge92- and Sn92- Zintl clusters: A DFT study

2021 ◽  
pp. 113191
Author(s):  
Hasnain Sajid ◽  
Sana Malik ◽  
Umer Rashid ◽  
Tariq Mahmood ◽  
Khurshid Ayub
Keyword(s):  
Hydrogen Adsorption ◽  
Dft Study ◽  
Zintl Clusters

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.

Synthesis and structure–property relations in xMoO3–0.6B2O3–(0.4−x)K2O (0.010 ≤ x ≤ 0.295) glasses

2016 ◽  
Vol 432 ◽  
pp. 480-486 ◽  
Author(s):  
B.B. Das ◽  
A. Srinivassan ◽  
M. Yogapriya ◽  
K. Palanisamy
Keyword(s):  
Structure Property ◽  
Property Relations

scholarly journals Structure‐Property Relations in Crack Resistant Alkaline Earth Aluminoborosilicate Glasses Studied by Solid State NMR

2020 ◽  
Author(s):  
Millena Logrado ◽  
Hellmut Eckert ◽  
Tetsuya Murata ◽  
Shingo Nakane ◽  
Hiroki Yamazaki
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Alkaline Earth ◽  
Structure Property ◽  
Property Relations

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

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.

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