BCMaterials Fortnightly Seminar #62: Catarina Lopes & Eduardo Fernández
CATARINA LOPES
(BCMATERIALS)
Fabrication of pure β-PVDF film in a 3D shape
Polymer piezoelectric materials are currently the focus of many interests, due to its capacity to combine lightless and flexibility with the generation of an electrical response under a mechanical deformation (and the inverse). Particularly, Poly(vinilidene fluoride) - PVDF- is the polymer of choice for an increasing number of applications since it has the best all-around electroactive properties. However, PVDF is a polymorph polymer and the crystallization in the b-phase, the one that present piezoelectric properties, only occurs under specific conditions. Currently it is impossible to obtain pure b-PVDF directly from the melt, what is the source of some problems in printing processes or in the polymer coating of irregular surfaces. In this work, this problematic will be addressed and a new technique for the crystallization of a pure b-PVDF film with a 3D shape in the b-phase is going to be described.EDUARDO FERNÁNDEZ
(BCMATERIALS)
Block Copolymers Hierarchical Templating of BiFeO3/CoFe2O4 Multiferroic Nanocomposite
In a vertically aligned nanocomposite oxide thin film, two co-deposited, immiscible oxide phases grow epitaxial on a single crystal substrate to form a two-phase columnar structure such as a checkerboard, a labyrinth, or pillars of one phase embedded in a matrix of the other phase. Oxide nanocomposite films can show multi-functionality arising from the properties and geometries of the phases, and strain mediated coupling between the two phases can lead to magneto- electric behavior when one phase is ferroelectric (BiFeO3) and the other ferromagnetic (CoFe2O4). In order to use multiferroic columnar nanostructures in device applications, it is necessary to control the location of the pillars on the substrate. Templating the ferromagnetic pillar locations can be performed by Electron beam lithography (EBL) ion milling, but is restricted to small-area fabrication. It can be also done into large areas by lift-off process with hard masks made from EBL-patterned gold or from anodic aluminum oxide to create ferromagnetic nuclei with a 200-300 nm period. Block copolymers Self-assembled block copolymer thin films offer a next-generation nanolithography method that could overcome the cost and resolution challenges facing current UV photolithography technology.Related news
Senentxu Lanceros-Méndez: “Contribuimos a las revoluciones biotecnológica, de sostenibilidad y digital”
Senentxu Lanceros-Méndez es el director científico de BCMaterials desde 2018. En los seis años que lleva al frente del centro, éste ha experimentado un crecimiento exponencial en términos de...Workshop New Materials for a Better Life! 2024, el 27 de noviembre
El próximo 27 de noviembre BCMaterials realizará en su sede de Leioa una nueva edición de su workshop anual New Materials for a Better Life! Bajo el subtítulo ‘Materializing the future: fostering...Charla invitada con Marco Sangermano el 13 de noviembre
BCMaterials ofrecerá una nueva charla invitada el próximo 13 de noviembre, a cargo de Marco Sangermano, profesor pleno de Ciencia y Tecnología de Polímeros en el Politécnico de Turín (Italia) La...Congreso IMOH 2024: éxito científico y de participación
Del 15 al 17 de octubre, la sede de BCMaterials albergó la segunda edición del congreso ‘IMOH 2024, 2nd International Meeting on Challenges and Opportunities for HiCANS’, dedicado a la ciencia e...