scholarly journals Bridging experiment and theory: enhancing the electrical conductivities of soft-templated niobium-doped mesoporous titania films

2021 ◽  
Vol 23 (5) ◽  
pp. 3219-3224
Author(s):  
Marvin Frisch ◽  
Joachim Laun ◽  
Julien Marquardt ◽  
Aleks Arinchtein ◽  
Katharina Bauerfeind ◽  
...  
Keyword(s):  
Theoretical Approach ◽  
Mesoporous Titania ◽  
Structure Property ◽  
Property Relations ◽  
Electrical Conductivities ◽  
Niobium Doped ◽  
Titania Films

Combined experimental & theoretical approach for the elucidation of structure–property relations in niobium-doped mesoporous titania.

Organic superconductors: structure—property relations and new materials design

1985 ◽  
Vol 314 (1528) ◽  
pp. 83-95 ◽  
Keyword(s):  
Low Temperatures ◽  
Organic Materials ◽  
Ambient Pressure ◽  
Applied Pressure ◽  
Structural Disorder ◽  
Organic Superconductors ◽  
Structure Property ◽  
Property Relations ◽  
Conducting Materials ◽  
Electrical Conductivities

Most known organic materials are electrical insulators having extremely low electrical conductivities of δ < 10 -10 Ω -1 cm -1 . A small number of organic materials are semiconductors having, for classification purposes, conductivities of δ ≈ 10 -10 -1 Ω -1 cm -1 . A very small, but growing, number of organic substances are metallic in nature, i.e. having conductivities that rise with decreasing tem perature (δ ≈ 1−10 10 Ω -1 cm -1 ). The latter systems comprise a class of intensely studied materials known as ‘organic metals’ of which fewer than ten can display the complete absence of electrical resistance at low temperatures, i.e. superconductivity (δ ≈ infinity). The known organic superconductors are novel, being derived from radical-cation donors and monovalent anions, X. The donors are derived from two kinds of molecules, neither of which contain any metallic elements. These are TMTSF (tetramethyltetraselenafulvalene) and BED T-TTF (bis-ethylenedithiotetrathiafulvalene, or ‘ET’ in abbreviated form). Most of the (TMTSF) 2 X and (ET) 2 X conducting materials require applied pressure to induce superconductivity that is thus far observed at very low temperatures ( T e ≈ 1–2 K). However, two materials, (TMTSF) 2 ClO 4 and (ET) 2 I 3 are ambient pressure organic superconductors ( T e = 1.2 and 1.4 K, respectively). Within each class the crystal structures have many similarities, the most important being a complex ‘infinite sheet networkߣ of short Se-Se interactions in (TMTSF) 2 X and a ‘corrugated sheet network’ of short S-S interactions in ET 2 X. In this paper we discuss structure-property relations of the (TMTSF) 2 X salts, and of the (ET) 2 X salts as far as is known. In addition, we attempt to provide insight and guidelines for the synthesis of new highly conducting anionic derivatives of TMTSF and ET. It appears that while highly conducting (TMTSF) 2 X materials can be designed before synthesis, the onset of superconductivity depends heavily on the presence of anion order in the crystal, which is a parameter not easily controlled. For the (ET) 2 X systems the structural disorder apparent at 298 and 125 K may persist to very low tem perature, making it difficult to correlate structural order with superconductivity as is the case for (TMTSF) 2 X systems.

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.

Assembly of thin mesoporous titania films and their effects on the voltammetry of weakly adsorbing redox systems

2005 ◽  
Vol 579 (2) ◽  
pp. 267-275 ◽  
Author(s):  
Katy J. McKenzie ◽  
Pauline M. King ◽  
Frank Marken ◽  
Catherine E. Gardner ◽  
Julie V. Macpherson
Keyword(s):  
Mesoporous Titania ◽  
Redox Systems ◽  
Titania Films

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
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