Search results for "carbon"

Electrochemical Synthesis of an Organic Thermoelectric Power Generator.

2020

[EN] Energy harvesting through residual heat is considered one of the most promising ways to power wearable devices. In this work, thermoelectric textiles were prepared by coating the fabrics, first with multiple-wall carbon nanotubes (MWCNTs) by using the layer-by-layer technique and second with poly(3,4-ethylenedioxythiophene) (PEDOT) deposited by electrochemical polymerization. Sodium deoxycholate and poly(diallyldimethylammonium chloride) were used as stabilizers to prepare the aqueous dispersions of MWCNTs. The electrochemical deposition of PEDOT on the MWCNT-coated fabric was carried out in a three-electrode electrochemical cell. The polymerization of PEDOT on the fabric increased the…

Conjugation with carbon nanotubes improves the performance of mesoporous silicon as Li-ion battery anode

2020

Carbon nanotubes can be utilized in several ways to enhance the performance of silicon-based anodes. In the present work, thermally carbonized mesoporous silicon (TCPSi) microparticles and single-walled carbon nanotubes (CNTs) are conjugated to create a hybrid material that performs as the Li-ion battery anode better than the physical mixture of TCPSi and CNTs. It is found out that the way the conjugation is done has an essential role in the performance of the anode. The conjugation should be made between negatively charged TCPSi and positively charged CNTs. Based on the electrochemical experiments it is concluded that the positive charges, i.e., excess amine groups of the hybrid material i…

Influencia del cambio de uso sobre la erosión del suelo, carbono transportado por erosión y stocks de carbono en ambientes semiáridos mediterráneos

2014

A continuación se describen los temas principales que serán abordados en la tesis doctoral futura: - Relevancia del proceso de erosión hídrica en zonas semiáridas mediterráneas. - Influencia de la erosión en la dinámica del carbono. - Relaciones estructura-Erosión hídrica-Carbono. - Pools de carbono asociados con la erosión hídrica - Contribución de la erosión hídrica a la pérdida de carbono. - Cambio en las propiedades básicas del suelo debido al cambio de uso. - Cambios en la dinámica del carbono asociados a los cambios de uso del suelo - Cuantificación de los diferentes stocks de carbono orgánico en los diferentes usos de suelo. - Efecto de los usos del suelo en el carbono transportado p…

IBRIDI FORMATI DA NANOTUBI DI CARBONIO A PARETE MULTIPLA E ESTERI FOSFORICI: PROPRIETA’ E STUDI STRUTTURALI

2012

Nel corso degli ultimi anni i nanotubi di carbonio in virtù delle loro proprietà fisiche, chimiche e meccaniche sono diventati tra i più promettenti materiali per la realizzazione di congegni a livello nanometrico. I CNT trovano numerose applicazioni nel campo, della nanoelettronica, nella costruzione di materiali ad elevata conducibilità elettrica ed elevata resistenza meccanica,2 e vengono, anche, impiegati come agenti di rinforzo dispersi in una matrice polimerica.3 Problema principale di questi materiali è che essi risultano scarsamente solubili in ambiente acquoso e in solventi organici, a causa delle forti forze attrattive di van der Waals che esistono tra le superfici dei CNT, che li…

Interazioni non covalenti tra esteri fosforici e nanotubi di carbonio a parete multipla

2010

Fin dal 1991, quando Iijima li osservò per la prima volta, i nanotubi di carbonio (CNT) sono diventati oggetto d'interesse scientifico, in virtù delle loro proprietà fisiche, chimiche e meccaniche. Un impiego molto interessante riguarda l'aumento di stabilità di matrici polimeriche. I nanocompositi polimerici, in cui sono presenti percentuali molto basse di CNT (2.5%), presentano enormi miglioramenti nelle caratteristiche termomeccaniche, nella resistenza al calore e nella conduttività elettrica. C'è, però, un impedimento fondamentale a tutte le applicazioni che riguarda l'insolubilità intrinseca dei CNT nei solventi. La funzionalizzazione sia essa covalente che non è un espediente per ovvi…

Catalytic activity of palladium-based nanostructures in the conversion of simple olefinic hydro- and chlorohydrocarbons from first principles

2011

CCDC 1814087: Experimental Crystal Structure Determination

2018

Related Article: Attila Márió Remete, Melinda Nonn, Santos Fustero, Matti Haukka, Ferenc Fülöp, Loránd Kiss|2018|Eur.J.Org.Chem.|2018|3735|doi:10.1002/ejoc.201800057

CCDC 1814088: Experimental Crystal Structure Determination

2018

Related Article: Attila Márió Remete, Melinda Nonn, Santos Fustero, Matti Haukka, Ferenc Fülöp, Loránd Kiss|2018|Eur.J.Org.Chem.|2018|3735|doi:10.1002/ejoc.201800057

Eumelanin Coating of Silica Aerogel by Supercritical Carbon Dioxide Deposition of a 5,6-Dihydroxyindole Thin Film

2018

Eumelanin integration in silica aerogel (SA) was achieved via supercritical adsorption of 5,6-dyhydroxyindole (DHI) from CO2. Notably, after the supercritical treatment, DHI evolved towards spontaneous polymerization, which resulted in uniform pigment development over the SA. The new material was characterized for its morphological and physicochemical properties, disclosing the formation of a eumelanin-like coating, as confirmed by UV&ndash

The Magmatic Gas Signature of Pacaya Volcano, With Implications for the Volcanic CO2Flux From Guatemala

2018

Pacaya volcano in Guatemala is one of the most active volcanoes of the Central American Volcanic Arc (CAVA). However, its magmatic gas signature and volatile output have received little attention to date. Here, we present novel volcanic gas information from in-situ (Multi-GAS) and remote (UV camera) plume observations in January 2016. We find in-plume H2O/SO2 and CO2/SO2 ratios of 2-20 and 0.6-10.5, and an end-member magmatic gas signature of 80.5 mol. % H2O, 10.4 mol. % CO2, and 9.0 mol. % SO2. The SO2 flux is evaluated at 885 ± 550 tons/d. This, combined with co-acquired volcanic plume composition, leads to H2O and CO2 fluxes of 2,230 ± 1,390 and 700 ± 440, and a total volatile flux of ∼3…