Search results for "ATAL"
showing 10 items of 10591 documents
STABILITY AND ORGANOCATALYTIC EFFICIENCY OF N-HETEROCYCLIC CARBENES ELECTROGENERATED IN ORGANIC SOLVENTS FROM IMIDAZOLIUM IONIC LIQUIDS
2015
The kinetic of degradation of 1-butyl-3-methylimidazole-2-ylidene (selected as model N-heterocyclic carbene - NHC), generated in organic solvents by cathodic reduction of the parent 1-butyl-3- methylimidazolium salts BMIm-X, was studied by a simple voltammetric analysis. The effect of NHC degradation rate on the efficiency of an organocatalyzed reaction (the synthesis of g-butyrolactone from cinnamaldehyde and trifluoromethylacetophenone) was investigated. The nature of the solvent and of the anion X have a remarkable effect on the stability of the NHC, the bis(trifluoromethylsulfonyl) imide anion being the best for a long lasting carbene (while acetonitrile seems to be the worst solvent). …
Erityinen ystävyys : miehen ja naisen välinen rakkaus uuden ajan alun Suomessa (n. 1650-1700)
2015
Tailored nanosized metal catalysts for improving activity and selectivity via engineering of their structure and local environment - NANOCAT PUBLISHA…
2008
Nuovi Catalizzatori Sol-Gel per la Chimica Fine e la Valorizzazione della Biomassa
2014
Alcohol-Selective Oxidation in Water under Mild Conditions via a Novel Approach to Hybrid Composite Photocatalysts
2015
Abstract The oxidation of alcohols to carbonyl compounds in a clean fashion (i.e., with water as a solvent or under solvent‐free conditions, and using O2 or H2O2 as the primary oxidant) is the subject of considerable research efforts. A new approach for the selective oxidation of soluble aromatic alcohols in water under mild conditions via a novel composite photocatalyst has been developed. The catalyst is synthesized by grafting 4‐(4‐(4‐hydroxyphenylimino)cyclohexa‐2,5dienylideneamino)phenol and silver nanoparticles onto the surface of moderately crystalline titanium dioxide. The titanium dioxide‐based composite was first extensively characterized and then employed in the catalytic oxidati…
Surface modification of poly(ethylene-co-acrylic acid) with amino-functionalized silica nanoparticles
2011
In this work we studied the possibility to achieve a hybrid-surface through the modification, via a facile wet chemical process, of the surface of films of poly(ethylene-co-acrylic acid) (EAA) with amino-modified silica nanoparticles. Films of EAA were preliminarily activated by the introduction of -COCl groups on their surface. Silica nanoparticles were thereafter covalently bound on the polymeric surface as confirmed by FTIR, ATR-FTIR, XPS, NMR and SEM determinations. The nanoparticles formed a multilayer on the film surface and covered almost uniformly the whole film surface. Direct measurements of superficial amino groups by titration allowed us to detect a concentration of about 18 nmo…
Interazioni tra nanotubi e molecole organiche
Nell'ampio scenario dei nanomateriali, i sistemi nanotubolari godono di un consolidato e crescente interesse sia nell'ambito scientifico che industriale. Fra la miriade di sistemi tubolari, i più utilizzati sono i nanotubi a base di carbonio e carbon nanohorns e più recentemente, vista l'elevata biocompatibilità e il loro basso costo, nanotubi inorganici quali i nanotubi di allosite. la funzionalizzazione di questi materiali con diverse tipologie di molecole organiche, ha permesso la sintesi di materiali che potrebbero o hanno trovato applicazione come filler polimerici, come supporti eterogenei in catalisi e nel campo del drug carrier e delivery. Inoltre, nel caso di nanotubi di allosite, …
Periodisme i literatura : Aurora Bertrana
2008
Aquest article s'inscriu dins del projecte Concepcions i discursos sobre la modernitat en la literatura catalana dels segles XIX i XX, del Grup d'Estudis de Literatura Catalana Contemporània de la Universitat Autònoma de Barcelona (referència HUM2005-01109 del MEC), i neix de dos estudis anteriors (Real 2006a i 2006b), als quals remeto per a una explicació més detallada tant amb relació a Bertrana com al context cultural del moment, en especial pel que fa a la literatura d'autora.