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Growth mechanism and structure of electrochemically synthesized dendritic polymethylsilane molecules
Matjaž Valant, Gregor Mali, Artem V. Badasyan, Andraž Mavrič, 2017, izvirni znanstveni članek

Opis: The study of an electrochemical synthesis of polymethylsilane from trifunctional trichloro- methylsilane monomers identified a single polymerization pathway involving reduction of the monomer to silyl anions and their addition to the growing polymer. The sizes of the synthesized macromolecules, measured with dynamic light scattering, are much larger than the theoretical size estimated for an ideal dendrimer. The reason for this, found by NMR analysis, is in a large number of branching irregularities (defects) contained in the molecular structure, which can be described as a hyperbranched dendritic polymer. Theoretical estimates of sizes for an ideal dendrimer were corrected assuming a branching defect is a cavity with the volume of one monomer. Appropriateness of the theoretical and experimental models was confirmed with a good quantitative agreement between the experimental densities and the theoretically calculated values.
Najdeno v: osebi
Ključne besede: Polymethylsilane Dendritic polymer Electropolymerization
Objavljeno: 20.03.2017; Ogledov: 311; Prenosov: 0
.pdf Polno besedilo (705,04 KB)

The electrochemical synthesis of dendritic polymethylsilane
Matjaž Valant, Gregor Mali, Artem V. Badasyan, Andraž Mavrič, 2017, objavljeni povzetek znanstvenega prispevka na konferenci

Najdeno v: osebi
Ključne besede: electropolymerization, polysilane, dendrimer
Objavljeno: 11.09.2017; Ogledov: 160; Prenosov: 0
.pdf Polno besedilo (152,81 KB)

A Mechanistic Study of Magnesium Sulfur Batteries
Ana Robba, Alen Vižintin, Jan Bitenc, Gregor Mali, Iztok Arčon, Matjaž Kavčič, Matjaž Žitnik, Klemen Bučar, Giuliana Aquilanti, Charlotte Martineau-Corcos, Anna Randon-Vitanova, Robert Dominko, 2017, izvirni znanstveni članek

Opis: Magnesium sulfur batteries are considered as attractive energy storage devices due to the abundance of electrochemically active materials and high theoretical energy density. Here we report the mechanism of a Mg-S battery operation, which was studied in the presence of simple and commercially available salts dissolved in a mixture of glymes. The electrolyte offers high sulfur conversion into MgS in the first discharge with low polarization. The electrochemical conversion of sulfur with magnesium proceeds through two well-defined plateaus, which correspond to the equilibrium between sulfur and polysulfides (high-voltage plateau) and polysulfides and MgS (low-voltage plateau). As shown by XANES, RIXS and NMR studies, the end discharge phase involves MgS with Mg atoms in a tetrahedral environment resembling the wurtzite structure, while chemically synthesized MgS crystalizes in the rock-salt structure with octahedral coordination of magnesium.
Najdeno v: osebi
Ključne besede: magnesium, sulfur, rechargeable batteries, XAS, NMR
Objavljeno: 19.10.2017; Ogledov: 126; Prenosov: 0
.pdf Polno besedilo (1,48 MB)

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