DSpace Collection:http://hdl.handle.net/10261/2992024-03-29T10:49:34Z2024-03-29T10:49:34ZOn-surface magnetocaloric effect for a van der Waals Gd(iii) 2D MOF grown on SiKumar, SubodhGabarró Riera, GuillemArauzo, AnaHrubý, JakubHill, StephenBogani, LapoRubio Zuazo, JuanJover, JesúsBartolomé, ElenaSañudo, E. Carolinahttp://hdl.handle.net/10261/3522012024-03-28T22:14:09Z2024-03-28T14:55:45ZTítulo: On-surface magnetocaloric effect for a van der Waals Gd(iii) 2D MOF grown on Si
Autor: Kumar, Subodh; Gabarró Riera, Guillem; Arauzo, Ana; Hrubý, Jakub; Hill, Stephen; Bogani, Lapo; Rubio Zuazo, Juan; Jover, Jesús; Bartolomé, Elena; Sañudo, E. Carolina
Resumen: Gd complexes have been studied as magnetic coolants due to their large magneto-caloric effect. In this work we present a Gd 2D metal-organic framework (MOF) of formula [Gd(MeCOO)(PhCOO)2] (1). We characterize the magnetic properties of 1, showing that it displays slow relaxation of the magnetization by ac susceptibility, and single-ion magnetic anisotropy using high-field EPR. By heat capacity and magnetization vs. field at various temperatures we determine the magnetic entropy change of compound 1. We then grow 1 on functionalized silicon, and show that the surface-deposited 2D MOF 1Si can be used as an on-surface magnetic cryogenic coolant.2024-03-28T14:55:45ZStrong dependence of air stability on thickness in n-doped carbon nanotube thermoelectricsDörling, BernhardHawkey, AngusZaumseil, JanaCampoy Quiles, Marianohttp://hdl.handle.net/10261/3505072024-03-15T02:50:11Z2024-03-14T17:33:16ZTítulo: Strong dependence of air stability on thickness in n-doped carbon nanotube thermoelectrics
Autor: Dörling, Bernhard; Hawkey, Angus; Zaumseil, Jana; Campoy Quiles, Mariano
Resumen: We demonstrate that the observed (in-)stability of n-doped carbon nanotube films in air not only depends on the employed dopant but is
also strongly affected by sample-specific factors, such as the film thickness and density. We show this for two typical dopants, polyethylenimine and a potassium crown ether complex, by preparing films of increasing thickness. We argue that reports on dopant stability cannot be
properly assessed without knowledge of these sample-specific parameters, which explains some of the conflicting results in the literature.2024-03-14T17:33:16ZCaenorhabditis elegans endorse bacterial nanocellulose fibers as functional dietary Fiber reducing lipid markersMuñoz Juan, AmandaAssié, AdrienEsteve Codina, AnnaGut, MartaBenseny Cases, NúriaSamuel, Buck S.Dalfó, EstherLaromaine, Annahttp://hdl.handle.net/10261/3505052024-03-22T21:37:30Z2024-03-14T17:10:37ZTítulo: Caenorhabditis elegans endorse bacterial nanocellulose fibers as functional dietary Fiber reducing lipid markers
Autor: Muñoz Juan, Amanda; Assié, Adrien; Esteve Codina, Anna; Gut, Marta; Benseny Cases, Núria; Samuel, Buck S.; Dalfó, Esther; Laromaine, Anna
Resumen: Bacterial nanocellulose (BNC) is a promising dietary fiber with potential as a functional food additive. We evaluated BNC fibers (BNCf) in the Caenorhabditis elegans model to obtain insight into the BNCf's biointeraction with its gastrointestinal tract while reducing the variables of higher complex animals. BNCf were uptaken and excreted by worms without crossing the intestinal barrier, confirming its biosafety regarding survival rate, reproduction, and aging for concentrations up to 34 μg/ml BNCf. However, a slight decrease in the worms' length was detected. A possible nutrient shortage or stress produced by BNCf was discarded by measuring stress and chemotactic response pathways. Besides, we detected a lipid-lowering effect of BNCf in N2 C. elegans in normal and high-caloric diets. Oxidative damage was computed in N2 worms and Rac1/ced-10 mutants. The GTPase Rac1 is involved in neurological diseases, where its dysregulation enhances ROS production and neuronal damage. BNCf reduced the lipid oxidative markers produced by ROS species in this worm strain. Finally, we detected that BNCf activated the genetic expression of the immunological response and lipid catabolic process. These results strengthen the use of BNCf as a functional dietary fiber and encourage the potential treatment of neurological disease by modulating diet.2024-03-14T17:10:37ZRedox-Active Au Nanoparticles Self-Assembled at Liquid-Liquid Interface via C-Au Functionalization for Dye Degradation ElectrocatalysisCatalán Toledo, JoséDjafari, JamilaMas Torrent, MartaCrivillers, Núriahttp://hdl.handle.net/10261/3505022024-03-23T21:44:28Z2024-03-14T16:45:56ZTítulo: Redox-Active Au Nanoparticles Self-Assembled at Liquid-Liquid Interface via C-Au Functionalization for Dye Degradation Electrocatalysis
Autor: Catalán Toledo, José; Djafari, Jamila; Mas Torrent, Marta; Crivillers, Núria
Resumen: This work presents the synthesis of poly(vinylpyrrolidone)-stabilized gold nanoparticles (Au NPs) and their subsequent functionalization with molecules bearing terminal alkynes. The ligand exchange occurs at the liquid-liquid interface (LLI), resulting in the formation of Au NPs stabilized through the covalent C-Au functionalization. Simultaneously, structured composite films are formed, driven by the self-assembly of the Au NPs supported by the polymer. A comparative analysis involving three distinct alkyne-terminated derivatives reveals that film formation is favored when the ligand includes an aromatic unit such as in a ferrocenyl-stilbene derivative. The LLI films can be easily transferred to solid a support for their characterization. Additionally, it is demonstrated that these films serve as a potential electrocatalytic platform. As a proof of concept, we demonstrate that the electrochemically active ferrocene-based Au NPs films can efficiently remove methylene blue via an electro-Fenton-like reaction, surpassing the efficiency of the non-redox phenylacetylene Au NP films.2024-03-14T16:45:56Z