This results in the symmetry of the crystal being broken. This means, for example, that when one presses on the material, an electrical voltage naturally arises across the material due to the movement of positive and negative ions relative to each other. Typical piezoelectric materials have a so-called non-centrosymmetric crystal lattice. in car technology and medical applications," says Nini Pryds.Īs a fundamental premise, piezoelectric materials depend on crystal symmetry. "The new development will provide a fundamental step towards environmentally friendly piezoelectric materials with high performance for use, e.g. The BioWings project aims to develop biocompatible materials with properties similar to common lead-containing materials that do not contain lead or the other harmful materials," says Nini Pryds, adding: "Many micro-electromechanical systems already exist, but they often contain lead-containing materials that are harmful for human implantation. blood cell sorting, bacterial separation, and estimation of hematocrit levels are high. It is a great challenge, but the potential within, e.g. The work stems from the DTU-coordinated EU project Biowings, where several European partners are researching the development of new biomedical MEMS made with thin, lead-free films based on Gadolinium-doped oxide materials that are non-toxic and environmentally friendly. The research was conducted with colleagues from EPFL (École Polytechnique Fédérale de Lausanne), Tel Aviv University and the University of Antwerp. It paves the way for designing piezoelectric materials that are lead-free and far more environmentally friendly. In a new, scientific article in the journal Science, Professor Nini Pryds and Professor Vincenzo Esposito from DTU Energy show that it is possible to create piezoelectric effects in materials where this is not ordinarily possible. However, researchers assess an excellent potential for utilizing the piezoelectric effect in a wider range of diagnostics, prognosis and therapy technologies if lead could be removed. This may prove to be a barrier to the spread of technology in, for example, the biomedical field, as lead is harmful to the body. These materials, however, often contain lead in the form of lead zirconate titanate (PZT). Here, materials other than quartz must be used. In small devices, they are known as MEMS (micro-electromechanical systems). Piezoelectricity is often used in sensors, actuators, and resonators. It also works the other way around: Exposing them to a mechanical impact will create an electrical voltage. Piezoelectric materials have the particular property that their shape changes when applying an electrical voltage to the material.
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