W r e n 2 0 2 4
Wren 2024
The Workshop on Renewable Energy and Sustainability
Laboratory for Preparation and Computation of Nanomaterials - (LPCN)
Recently we have discovered and optimized the first practical synthesis of non-fused pyrrole[3,2-b]pyrroles via domino reaction of aldehydes, primary amines, and butane-2,3-dione.1 Six bonds are formed in heretofore unknown tandem process, which gives rise to substituted pyrrole[3,2-b]pyrroles – the ‘missing link’ on the map of aromatic heterocycles. Unparalleled simplicity and versatility of this one-pot reaction, non-chromatographic purification and superb optical properties (including strong violet, blue or green fluorescence both in solution as well as in the solid state), brought these molecules from virtual non-existence to the intensively investigated area functional π-systems. The parent 1,4-dihydro-pyrrolo[3,2-b]pyrroles served as building block to construct various π-expanded analogs including nitrogen-embedded buckybowl with inverse Stone–Thrower–Wales topology2,3 and diindolo[2,3-b:2',3'-f]pyrrolo[3,2-b]pyrroles. These compounds constitute the most electron-rich ladder-type heteroacenes known to date .... Read more
Perovskites have been used in the manufacture of solar cells with efficiencies exceeding 25%. The most common perovskite, CH3NH3PbI3, is prepared mainly by spin-coating a solution with lead iodide (PbI2) and methylammonium iodide (MAI), either mixed (one step) or sequentially (two steps). It has already been demonstrated that highly efficient solar cells can be obtained by using PbI2 deposited by sputtering. Here we investigated the optical and structural properties of PbI2 deposited by rf-sputtering of a PbI2 target at temperatures ranging from room temperature to 150 ºC and perovskite films obtained by the two step technique. Optical and structural properties of the films were investigated using UV-Vis spectroscopy, XRD, Raman, AFM and SEM spectroscopy. It was observed that the deposition temperature largely influences the optical and structural properties of the films. X-ray diffraction and SEM indicated the presence of segregated metallic lead (Pb), .... Read more
The translational research presented discusses how to address some topics of Quantum Mechanics in high school, using Physics experiments, according to the didactic approach of Project Based Learning ( with a STEAM foc us, having as a problematizing issue the generation and use of sustainable electric energy. The theme and the didactic approach chosen are justified by the importance of deepening in high school the study of concepts related to sustainable energy, which co rroborated advances in society, especially when it comes to new technologies that are present in people's daily lives, bringing impacts of social, economic and environmental nature. In the practice of teaching physics over the last decades, it is common th at the teaching of classical physics to be prioritized, causing the concepts of modern physics to be underdeveloped and, when approached, usually in a decontextualized and abstract perspective, not enhancing the learning of the subject. .... Read more
The transition to renewable energy is a critical step toward a sustainable future, and electrical connectors play a critical role in enabling this transformation, particularly in their applications for electric vehicles (EVs) and energy storage systems (ESS). As renewable energy sources like solar and wind become more prevalent, the demand for reliable, efficient, and durable connectors is rising. Ensuring the seamless transmission of power, optimizing energy efficiency, and maintaining the safety are critical in supporting this transition. Connectors for Electric Vehicles: Electric vehicles are at the forefront of the clean energy revolution, offering a cleaner alternative to traditional internal combustion engine vehicles. However, the performance and reliability of EVs heavily depend on the quality of their electrical connectors. These connectors are responsible for facilitating the transfer of power from the battery to the motor, managing communication between various electronic components, and recharging the battery. This poster outlines specific requirements for EV connectors, including .... Read more
Recently, several carbon allotropes with sp2 and sp3 hybridization were predicted theoretically and some are candidates to show Dirac's cones [1-3]. Here we study the eléctron and phonon properties of one of these new allotropes of two- dimensional carbon called phagraphene, consisting of rings with 5, 6 and 7 atoms (Figure 1a) [4]. This stable structure is energetically relatively close to graphene compared to other allotropes of carbon due to its sp2 hybridization and dense atomic packing. The existence of a Dirac cone distorted in the first Brillouin zone of this structure was shown by both density functional theory (DFT) and tight-binding calculations [4]. Our investigations are based on DFT as implemented in SIESTA [5]. Electron and phonon band structures (Figure 1b,c) and density of states are computed with .... Read more
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Laboratory for Preparation and Computation of Nanomaterials - (LPCN)