9 documents found, page 1 of 1
Carbon-Coated Magnetic Catalysts for Enhanced Degradation of Nitrophenols: Stab...
Baldo, Arthur P.; Bezerra, Ana J.B.; Silva, Adriano S.; Silva, Ana P. F.; Roman, Fernanda; Çaha, Ihsan; Bañobre-López, Manuel; Deepak, Francis LeonardNitrophenols are persistent organic pollutants that pose serious environmental and health risks due to their toxic and lipophilic nature. Their persistence arises from strong aromatic stability and resistance to biodegradation, while their lipophilicity facilitates bioaccumulation, exacerbating ecological and human health concerns. To address this challenge, this study focuses on the synthesis and characterizat...
Growth of Carbon Nanotubes on Co(x)‐Ni(1‐x) Ferrites by Chemical Vapor Depositi...
Silva, Adriano S.; Roman, Fernanda; Díaz de Tuesta, Jose Luis; Olias, Lola G.; Çaha, Ihsan; Ferreira, Ana P.; Souza, Renata P. deUpcycling plastic solid wastes (PSWs) into high-value carbon nanotubes (CNTs) offers a promising approach to sustainable material development. This study explores the synthesis of CNTs via chemical vapor deposition (CVD) using mixed cobalt-nickel-iron oxide catalysts supported on alumina and PSW representative polyolefins as carbon sources. The impact of catalyst composition on the yield, morphology, and textur...
Ferroelectric behavior arising from polar topologies in epitaxially strained Sr...
Rodrigues, Tiago; Silva, José Pedro Basto; Figueiras, Fábio; Soares, M. R.; Vilarinho, R.; Moreira, J. Agostinho; Çaha, Ihsan; Deepak, Francis LeonardIn this work, we show that epitaxially strained SrTiO3-δ thin films, grown by ion-beam sputtering onto (001)Nb: SrTiO3 substrates, exhibit a ferroelectric behavior. At the atomic-scale, through high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) images, it was possible to identify the presence of polar nanoregions with non-trivial polar topological structures in the SrTiO3-δ fil...
Hybrid multi-core shell magnetic nanoparticles for wet peroxide oxidation of pa...
Silva, Adriano S.; Roman, Fernanda; Dias, Arnaldo; Díaz de Tuesta, Jose Luis; Narcizo, Alexandre; Silva, Ana P. F.; Çaha, Ihsan; Deepak, Francis LeonardClean water availability is becoming a matter of global concern in the last decades. The responsible entities for wastewater treatment do not have the proper facilities to deal with a wide range of pollutants. Special attention should be given to emerging contaminants, whose presence in water bodies may cause adverse effects on the aquatic ecosystem and human health. Most studies in the literature do not consid...
Over 100 mV VOC improvement for rear passivated ACIGS ultra‐thin solar cells
Oliveira, Antonio; Rocha Curado, Marco; Teixeira, J. P.; Tomé, Daniela; Çaha, Ihsan; Oliveira, Kevin; Lopes, Tomás; Monteiro, Margarida; Violas, AndréA decentralized energy system requires photovoltaic solutions to meet new aesthetic paradigms, such as lightness, flexibility, and new form factors. Notwithstanding, the materials shortage in the Green Transition is a concern gaining momentum due to their foreseen continuous demand. A fruitful strategy to shrink the absorber thickness, meeting aesthetic and shortage materials consumption targets, arises from in...
Doxorubicin delivery performance of superparamagnetic carbon multi-core shell n...
Silva, Adriano S.; Díaz de Tuesta, Jose Luis; Sayuri Berberich, Thais; Inglez, Simone Delezuk; Bertão, Ana Raquel; Çaha, Ihsan; Deepak, Francis LeonardIn the past decade, magnetic nanoparticles (MNPs) have been among the most attractive nanomaterials used in different fields, such as environmental and biomedical applications. The possibility of designing nanoparticles with different functionalities allows for advancing the biomedical applications of these materials. Additionally, the magnetic characteristics of the nanoparticles enable the use of magnetic fie...
Cu(In,Ga)Se2 based ultrathin solar cells: the pathway from lab rigid to large s...
Lopes, Tomás; Teixeira, Jennifer; Curado, Marco; Ferreira, Bernado; Oliveira, Antonio; Cunha, José; Monteiro, Margarida; Violas, André; Barbosa, JoãoFor the first time, the incorporation of interface passivation structures in ultrathin Cu(In,Ga)Se2 (CIGS) based solar cells is shown in a flexible lightweight stainless-steel substrate. The fabrication was based on an industry scalable lithography technique - nanoimprint lithography (NIL) - for a 15x15 cm2 dielectric layer patterning, needed to reduce optoelectronic losses at the rear interface. The nanopatter...
Improved tribocorrosion behavior obtained by in-situ precipitation of Ti2C in T...
Gonçalves, Vinícius Richieri Manso; Çaha, Ihsan; Alves, Alexandra Manuela Vieira Cruz Pinto; Toptan, Fatih; Rocha, Luís AugustoNovel in-situ Ti-based matrix composites (TMCs) were developed through the reactive hot pressing of Ti + NbC powder blends. Due to the chemical reaction that occurred in the solid-state during processing, the produced samples were composed of an Nb-rich β-Ti phase that formed a metallic matrix along with Ti<sub>2</sub>C as a reinforcing phase. By employing different proportions of Ti:NbC, the phase composition ...
Catalysis of ceria incorporated magnesium hydride: a follow up study
Pukazhselvan, D.; Çaha, Ihsan; Jakka, Suresh Kumar; Graça, Vanessa C.D.; Holz, Laura I.V.; Soares, M.J.; Kovalevsky, A.V; Deepak, Francis LeonardIn continuation with the results explored in our recent previous study (https://doi.org/10.1016/j.apsusc.2021.150062), the current work sheds more light regarding the active in situ catalytic species in ceria additive loaded hydrogen storage system, MgH2. For this study, two samples, MgH2+0.167CeO2 and MgH2+0.5CeO2 were processed through mechanical milling (5 h/200 rpm) and tests were conducted at various stage...