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Defect Engineering with Rational Dopants Modulation for High-Temperature Energy Harvesting in Lead-Free Piezoceramics.
Nanomicro Lett
November 2024
Key Laboratory of Advanced Functional Materials, Ministry of Education, College of Materials Science and Engineering, Beijing University of Technology, Beijing, 100124, People's Republic of China.
High temperature piezoelectric energy harvester (HT-PEH) is an important solution to replace chemical battery to achieve independent power supply of HT wireless sensors. However, simultaneously excellent performances, including high figure of merit (FOM), insulation resistivity (ρ) and depolarization temperature (T) are indispensable but hard to achieve in lead-free piezoceramics, especially operating at 250 °C has not been reported before. Herein, well-balanced performances are achieved in BiFeO-BaTiO ceramics via innovative defect engineering with respect to delicate manganese doping.
View Article and Find Full Text PDFCharacterizing Hygroscopic Films of Polyzwitterions in Electric Fields Using Neutron and X-ray Reflectometries: Electrostriction or Mass Loss?
ACS Appl Mater Interfaces
September 2024
Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.
Article Synopsis
- The study examines how ultrathin films made of polyzwitterions respond to electric fields when thermally annealed and placed on silicon substrates, using specular neutron reflectometry (NR) and X-ray reflectivity (XRR).
- Researchers applied a high voltage under vacuum and observed changes in film thickness, finding that the thickness decreased by up to 8% depending on the type of added salt, attributed to the loss of water and ionic liquids rather than electrostrictive effects.
- The combination of NR and XRR techniques offered insights into the films' hygroscopic nature and structural changes in response to electric fields, highlighting their potential applications in charged polymer technologies.
Drug-ionic surfactant interactions: density, sound speed, spectroscopic, and electrochemical studies.
Eur Biophys J
November 2023
Department of Chemistry, Forman Christian College (A Chartered University), Lahore, 54600, Pakistan.
The failure of antibiotics against infectious diseases has become a global health issue due to the incessant use of antibiotics in the community and a lack of entry of new antibacterial drugs onto the market. The limited knowledge of biophysical interactions of existing antibiotics with bio-membranes is one of the major hurdles to design and develop more effective antibiotics. Surfactant systems are the simplest biological membrane models that not only mimic the cell membrane functions but are also used to investigate the biophysical interactions between pharmaceutical drugs and bio-membranes at the molecular level.
View Article and Find Full Text PDFAtomically engineered interfaces yield extraordinary electrostriction.
Nature
September 2022
Department of Energy Conversion and Storage, Technical University of Denmark, Kongens Lyngby, Denmark.
Electrostriction is a property of dielectric materials whereby an applied electric field induces a mechanical deformation proportional to the square of that field. The magnitude of the effect is usually minuscule (<10 m V for simple oxides). However, symmetry-breaking phenomena at the interfaces can offer an efficient strategy for the design of new properties.
View Article and Find Full Text PDFElectrostrictive and Piezoelectric Effects in Relaxor Ferroelectrics: Historical Background.
IEEE Trans Ultrason Ferroelectr Freq Control
November 2022
Electrostrictive effects in complex-perovskite "relaxor" ferroelectrics (FEs) exhibit superior performance in comparison with the simple-perovskite normal FEs, such as giant electrostriction in its paraelectric phase and high electromechanical coupling in its FE phase. As one of the discoverers, the author will deliver the historical background of these epoch-making phenomena and the development strategy of how we considered performance improvement. Though both discoveries were actually originated from a sort of "serendipity" (lucky & accidental occurrence!), some of the key factors have been embedded in the research base: 1) interrelation between complex perovskite structure and ferroelectricity; 2) anharmonicity in relaxor FEs; and 3) microdomain contribution in relaxor FEs.
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