65 documents found, page 1 of 7
Osteogenic differentiation triggered by intracellular magnetoelectric stimulati...
Mendes, Maria C.; Martins, Elisa A.G.; Chernozem, Roman V.; Chernozem, Polina V.; Custódio, Catarina C.; Surmenev, Roman A.; Kholkin, Andrei L.Magnetoelectric nanoparticles (MENPs), combining a magnetostrictive core with a piezoelectric shell, offer a promising route for remote-controlled biomedical applications by converting external magnetic fields into electric cues. However, the clinical translation of these materials remains limited due to the toxicity of high-performance piezoelectric materials, which typically contain lead. Previously, we devel...
Instrumented electromagnetic generator: optimized performance by automatic self...
Carneiro, Pedro M. R.; Vidal, João V.; Rolo, Pedro; Peres, Inês; Ferreira, Jorge A. F.; Kholkin, Andrei L.; Santos, Marco P. Soares dosElectromagnetic generators are widely used to power both small-scale and large-scale devices. They are suitable to operate as self-powering technologies, allowing customizable upscaling and downscaling, ensuring low production and maintenance costs, and even able to integrate into hybrid solutions. As their architectures are well-suited to power a broad range of multifunctional devices, their performance optimi...
Automated electromagnetic generator with self-adaptive structure by coil switching
Vidal, João V.; Rolo, Pedro; Carneiro, Pedro M. R.; Peres, Inês; Kholkin, Andrei L.; Santos, Marco P. Soares dosSelf-powered electronic devices have been widely sought after in the last few years demanding efficient harvesting of locally available forms of energy. Electromagnetic generators are suitable contenders for powering both small-scale and large-scale devices due to their widespread availability and customizability. New promising magnet levitation architectures for mechanical vibration energy harvesting offer low...
Wake-up free ferroelectric rhombohedral phase in epitaxially strained ZrO2 thin...
Silva, José Pedro Basto; Negrea, Raluca F.; Istrate, Marian C.; Dutta, Sangita; Aramberri, Hugo; Íñiguez, Jorge; Figueiras, Fábio G.; Ghica, CorneliuZirconia- and hafnia-based thin films have attracted tremendous attention in the past decade because of their unexpected ferroelectric behavior at the nanoscale, which enables the downscaling of ferroelectric devices. The present work reports an unprecedented ferroelectric rhombohedral phase of ZrO2 that can be achieved in thin films grown directly on (111)-Nb:SrTiO3 substrates by ion-beam sputtering. Structura...
Synthesis and characterisation of lead free BaFe12O19 –(K0.5Na0.5)NbO3 magnetoe...
Medeiros, Marco S. A.; Coondoo, Indrani; Oliveira, Filipe J. S.; Kholkin, Andrei L.; Amaral, João S.; Pullar, Robert C.Polycrystalline lead-free (1-x)BaFe12O19–x(K0.5Na0.5)NbO3 magnetoelectric ceramic composites (x = 10, 20 and 30 wt%) were fabricated for the first time, comparing various synthesis techniques, namely solid state reaction, sol-gel, co-precipitation and citrate combustion methods for the synthesis of the ferrite phase. As well as the four synthesis routes, comparisons were made between uniaxial pressing and cold ...
Peculiarities of the Crystal Structure Evolution of BiFeO3-BaTiO3 Ceramics acro...
Karpinsky, Dmitry V.; Silibin, Maxim V.; Trukhanov, Sergei V.; Trukhanov, Alex V.; Zhaludkevich, Alexander L.; Latushka, Siarhei I.Evolution of the crystal structure of ceramics BiFeO3-BaTiO3 across the morphotropic phase boundary was analyzed using the results of macroscopic measuring techniques such as X-ray diffraction, differential scanning calorimetry, and differential thermal analysis, as well as the data obtained by local scale methods of scanning probe microscopy. The obtained results allowed to specify the concentration and temper...
Piezoelectric properties of Pb1-xLax(Zr0.52Ti0.48)1-x/4O3 thin films studied by...
Cornelius, Thomas W.; Mocuta, Cristian; Escoubas, Stéphanie; Lima, Luiz R.M. [UNESP]; Araújo, Eudes B. [UNESP]; Kholkin, Andrei L.; Thomas, OlivierMade available in DSpace on 2020-12-12T01:35:41Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-08-01; Ministry of Education and Science of the Russian Federation; Federación Española de Enfermedades Raras; The piezoelectric properties of lanthanum-modified lead zirconate titanate Pb1-xLax(Zr0.52Ti0.48)1-x/4O3 thin films, with x = 0, 3 and 12 mol% La, were studied by in situ synchrotron X-ray diffraction...
Nanoplasmonic response of porous Au-TiO2 thin films prepared by oblique angle d...
Rodrigues, Marco S.; Borges, Joel Nuno Pinto; Proença, Maria Manuela Carvalho; Pedrosa, Paulo Eduardo Teixeira Baptista; Martin, NicolasIn this work, a versatile method is proposed to increase the sensitivity of optical sensors based on the localized surface plasmon resonance (LSPR) phenomenon. It combines a physical deposition method with the oblique angle deposition technique, allowing the preparation of plasmonic thin films with tailored porosity. Thin films of Au-TiO2 were deposited by reactive magnetron sputtering in a 3D nanostructure (zi...
Narrow optical gap ferroelectric Bi2ZnTiO6 thin films deposited by RF sputtering
Figueiras, Fábio G.; Fernandes, J. Ramiro A.; Silva, J. P. B.; Alikin, Denis O.; Queirós, Eugénia C.; Bernardo, César Rui Freitas; Barcelay, Y. R.This work reports the deposition of single phase Bi2ZnTiO6 thin films onto Pt/Si-based substrates using the RF-sputtering method and the respective structural, morphological, optical and local ferroelectric characterization. The thin film grows in the polycrystalline form with tetragonal P4mm symmetry identified by X-ray diffraction. The lack of a spatial inversion centre was confirmed by the second harmonic ge...
Surface wettability modification of poly(vinylidene fluoride) and copolymer fil...
Correia, Daniela Maria Silva; Nunes-Pereira, João; Alikin, Denis; Kholkin, Andrei L.; Carabineiro, Sónia A .C.; Rebouta, L.; Rodrigues, Marco S.This manuscript reports on the modification of the surface wettability of poly (vinylidene fluoride) (PVDF) and PVDF copolymer films and membranes by plasma treatments at different conditions, under oxygen and argon atmospheres. It is shown that a more pronounced decrease of the contact angle after O2 plasma treatments is obtained, with a decrease of ∼20-30° for PVDF and its copolymers films, leading also to su...