Search results for " Solar"

Laboratory disruption of scaled astrophysical outflows by a misaligned magnetic field

2021

The shaping of astrophysical outflows into bright, dense, and collimated jets due to magnetic pressure is here investigated using laboratory experiments. Here we look at the impact on jet collimation of a misalignment between the outflow, as it stems from the source, and the magnetic field. For small misalignments, a magnetic nozzle forms and redirects the outflow in a collimated jet. For growing misalignments, this nozzle becomes increasingly asymmetric, disrupting jet formation. Our results thus suggest outflow/magnetic field misalignment to be a plausible key process regulating jet collimation in a variety of objects from our Sun’s outflows to extragalatic jets. Furthermore, they provide…

HMF Selective Photo-oxidation in Aqueous Suspension of Both Bare and H2O2 Treated Carbon Nitride Carried out in a Solar Pilot Plant

2018

HMF Selective Photo-oxidation in Aqueous Suspension of Both Bare and H2O2 Treated Carbon Nitride Carried out in a Solar Pilot Plant

Intrinsic Organic Semiconductors as Hole Transport Layers in p–i–n Perovskite Solar Cells

2021

Thin polymeric and small-molecular-weight organic semiconductors are widely employed as hole transport layers (HTLs) in perovskite solar cells. To ensure ohmic contact with the electrodes, the use of doping or additional high work function (WF) interlayer is common. In some cases, however, intrinsic organic semiconductors can be used without any additive or buffer layers, although their thickness must be tuned to ensure selective and ohmic hole transport. Herein, the characteristics of thin HTLs in vacuum-deposited perovskite solar cells are studied, and it is found that only very thin (<5 nm) HTLs readily result inhigh-performing devices, as the HTL acts as a WF enhancer while still ens…

Semitransparent Design of Planar n-i-p Perovskite Solar Cells using a Cost-Effective, Perovskite-Compatible DMD Structure as the Top Electrode

In recent years, a significant emphasis has been placed on developing multi-functional solar cells that integrate new features such as color and transparency, thereby opening up the possibility of unconventional photovoltaic (PV) applications, including building-integrated PV (BIPV) systems, tandem solar cells, and wearable electronics. In particular, the integration of semitransparent (ST) solar cells into buildings as power-generating windows, facades or other aesthetic architectural elements constitutes one of the most intriguing perspectives [1]. Since silicon-based panels are generally opaque and unaesthetic, there has been a growing research interest in emerging thin-film solar cells …

Fullerene-Polymers: Synthesis, Properties and Applications

2009

Written by an outstanding team of experts in the interdisciplinary areas of research, this book is based on a new classification of the different types of fullerene polymers according to their chemical structures. It covers all aspects, from different classes, to their synthesis and applications in material science. Of great interest to polymer and synthetic chemists, but also for material scientists and industrial chemists.

Le Tecnologie Fotovoltaiche

2011

LIQUIDI IONICI E FULLERENI: PIATTAFORME PER NUOVI MATERIALI

The synthesis of innovative catalysts based on different carbon nanoforms (CNFs), namely fullerene C60 and carbon nanotubes (CNTs), and their application in Suzuki and Heck C-C coupling reactions, constitutes the common thread of the first part (Chapter 1 and 2) of this thesis. C60 and CNTs were functionalized with ionic liquids (ILs) and poly-amidoamine (PAMAM) dendrimers, respectively, and used as supports for palladium nanoparticles (PdNPs). Moreover, additional supported catalytic systems based on one of the synthesized C60-IL hybrids were prepared and successfully employed in the title coupling reactions. The final part (Chapter 3) of the thesis deals on the microwave-mediated synthesi…

Ossidazione fotocatalitica selettiva di idrossimetilfurfurale in sospensione acquosa di nitruro di carbonio (C3N4) puro e trattato con H2O2 in un imp…

2018

In questo lavoro, viene confrontata l'attività del C3N4 sia puro che trattato con H2O2 per la conversione selettiva di HMF a FDC in mezzo acquoso e utilizzando un reattore solare su scala pilota.

Photoactivity of Shape-Controlled TiO2 in Gas-Solid Regime Under Solar Irradiation

2018

Shape-controlled TiO2 materials have been tested as photocatalysts under both simulated and natural solar irradiation.

Fine structure and dynamic heating from temporal and spatial analysis of a solar active region observed with Solar Dynamics Observatory (SDO)

An outstanding issue in current solar and astrophysical research is that of the heating of the solar corona. How is the corona heated to temperatures of greater than 1 MK when the photosphere below is only 6000 K? One observational approach to addressing this important question is to focus on particular areas in the corona such as active regions (ARs). In a scenario that heating is impulsive and the cross-field spatial scale of the heating is so small, under the resolution of the current instruments, we attempted to narrow the question further to discrete bright magnetic flux tubes, the coronal loops, inside active regions. We investigate the emission variability, heating and substructure o…