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We synthesized silica-coated barium titanate (BaTiO) particles with different silica shell thicknesses and evaluated the effect of silica coating on the relative dielectric properties of silica-coated BaTiO particles. Furthermore, composite elastomers were prepared using hydrogenated carboxylated acrylonitrile-butadiene rubber (HXNBR) with a high relative dielectric constant (ε) and silica-coated BaTiO particles, and their performance as an actuator was evaluated. Both ε and relative dielectric loss of non-coated BaTiO particles increased at low frequencies (<200 Hz) associated with ionic conduction. However, ε and relative dielectric loss were reduced for the silica-coated BaTiO particles with thick silica shells, indicating that silica coating reduced ion migration. The dielectric breakdown strength increased with the thickness of the silica shell; it increased up to 80 V/μm for HXNBR/silica-coated BaTiO particles with 20 nm-thick silica shells. The maximum generated stress, strain, and output energy density of the composite elastomer with HXNBR (with a high relative constant) and silica-coated BaTiO were 1.0 MPa, 7.7%, and 19.4 kJ/m, respectively. In contrast, the values of the same parameters for a reference elastomer (acrylic/BaTiO; with low ε) were 0.4 MPa, 6.7%, and 6.8 kJ/m at the dielectric breakdown strength of 70 V/μm. The results indicated that the elastomers composed of HXNBR and silica-coated BaTiO exhibited higher generated stress, strain, and output energy density than elastomers for conventional dielectric actuators.
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http://dx.doi.org/10.1021/acsomega.0c05164 | DOI Listing |
ACS Nano
December 2024
School of Physical Science and Technology, Lanzhou University, 222 South Tianshui Road, Lanzhou 730000, China.
Polysulfide shuttling and dendrite growth are two primary challenges that significantly limit the practical applications of lithium-sulfur batteries (LSBs). Herein, a three-in-one strategy for a separator based on a localized electrostatic field is demonstrated to simultaneously achieve shuttle inhibition of polysulfides, catalytic activation of the Li-S reaction, and dendrite-free plating of lithium ions. Specifically, an interlayer of polyacrylonitrile nanofiber (PNF) incorporating poled BaTiO (PBTO) particles and coating with a layer of MoS (PBTO@PNF-MoS) is developed on the PP separator.
View Article and Find Full Text PDFMaterials (Basel)
November 2024
Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
This study successfully synthesized high-tetragonality barium titanate (BaTiO) particles with a small particle size by implementing ball milling in the solid-state synthesis of BaTiO and utilizing nanoscale raw materials. This study also addressed the issues of impurities and uneven particle size distribution that could exist in the synthesized BaTiO particles. The crystal structure, morphology, and particle size of the synthesized BaTiO particles have been meticulously analyzed and discussed through the use of techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), and the laser particle size analyzer.
View Article and Find Full Text PDFSmall
November 2024
Department of Biomedical Engineering, Lund University, Ole Römers väg 3A, 223 63, Lund, Sweden.
Bulk-wave-acoustofluidic devices provide strong acoustic fields and high device efficiency, thereby offering high-throughput capability when processing biological samples. Such devices are typically driven by lead zirconate titanate (PZT) transducers, which contain a high content of lead, inevitably resulting in environmental and biocompatibility issues. Replacing PZT with lead-free piezoelectric materials in various ultrasonic devices is considered challenging mainly due to the inferior piezoelectric properties lead-free materials possess compared to those of PZT.
View Article and Find Full Text PDFInt J Biol Macromol
November 2024
Department of Biomedical Engineering, Medical Engineering and Biology Research Center, Science and Research Branch, Islamic Azad University, Tehran, Iran. Electronic address:
Chem Asian J
November 2024
Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600 036, India.
One of the most promising approaches in solving the energy crisis and reducing atmospheric CO emissions is artificial photosynthetic CO reduction. The electrochemical method for CO reduction is more appealing since it can be operated under ambient conditions, and the product selectivity strongly depends on the applied potential. Perovskites with ferroelectric properties strongly adsorb linear CO molecules.
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