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Active catalytic species generated in situ in zirconia incorporated hydrogen storage material magnesium hydride

Journal of Magnesium and Alloys 2022年第3期10卷 852-861页

作者： D.Pukazhselvan K.S.Sandhya Devaraj Ramasamy Aliaksandr Shaula igor bdikin Duncan Paul Fagg Department of Mechanical Engineering Nanoengineering Research GroupCentre for Mechanical Technology and Automation(TEMA)University of AveiroAveiro 3810-193Portugal Department of Chemistry Malankara Catholic CollegeKaliyakkavilaiTamil Nadu 629153India Department of Computational Biology and Bioinformatics University of KeralaThiruvananthapuramKerala 695581India UIDM ESTGPolytechnic Institute of Viana do CasteloViana do Castelo 4900Portugal

This study explores how zirconia additive interacts with MgH_(2)to improve its hydrogen storage *** it is confirmed that the zirconia added MgH_(2)powder releases hydrogen at a temperature of about 50℃below that of the additive free MgH_(2).Subsequent tests by X ray diffraction(XRD)and infrared(IR)spectroscopy techniques reveal that the ZrO_(2) mixed MgH_(2)powder contains ZrHx(21.5)and MgO secondary *** observation is supported by the negative Gibbs free energy values obtained for the formation of ZrH_(2)/MgO from ZrO_(2)/MgH_(2)powder *** X ray photoelectron spectroscopy(XPS)study reveals that apart from Zr^(4+)cations,Zr^(2+) and zero valent Zr exist in the *** force microscopy(AFM)study reveals that the average grain size is 20 nm and the elemental line scan profiles further proves the existence of oxygen deficient Zr bearing phase(s).This study strengthens the belief that functional metal oxide additives in fact chemically interact with MgH_(2)to make active in-situ catalysts in the MgH_(2)system.

关键词： Hydrogen storage Binary hydrides Metal oxides Additives Nanocatalysis.

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Comprehensive investigation of structural,dielectric and local piezoelectric properties of KNN ceramics

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Journal of Advanced Dielectrics 2019年第2期9卷 33-44页

作者： Poonam Kumari Madan Lal Sunil Kumar Radheshyam Rai Anupinder Singh D.V.Karpinsky igor bdikin Department of Physics ACBS Eternal UniversityBaru Sahib 173101 Himachal PradeshIndia Department of Physics Guru Nanak Dev University Amritsar 143005India Scientific-Practical Materials Research Centre of NAS of Belarus Minsk 220072 BelarusIndia National Research University of Electronic Technology“MIET”Zelenograd 124498 MoscowRussia TEMA-NRD Mechanical Engineering Department and Aveiro Institute of Nanotechnology(AIN)University of AveiroAveiro 3810-193Portugal

In this research paper,we utilized the traditional high-temperature solid-state reaction method to fabricate the K_(0.495)Na_(0.520)NbO_(3),K_(0.480)Na_(0.535)NbO_(3)and K_(0.475)Na_(0.540)NbO_(3)(abbreviated as KNN-1,KNN-2,and KNN-3,respectively)lead-free ion deficient ceramics for understanding the influence of ionic deficiency on the crystalline structure and dielectric/piezoelectric properties of the samples.X-ray diffraction patterns of these samples exhibited a perovskite tetragonal *** anomalies around 287℃and 471℃were identified as ferroelectric to ferroelectric and ferroelectric to paraelectric-transition temperatures for KNN-2 at 1 *** was found that the composition KNN-2 exhibit relatively high Curie temperature i.e.,471℃.The conductivity plots confirm that the activation energies are *** impedance behavior in our ceramic samples can be analyzed with the bulk/grain *** slope of Z′with temperature shows negative temperature coefficient of resistance(NTCR)type behavior in proposed KNN ceramics material.

关键词： KNN dielectric properties X-ray diffraction(XRD) NTCR PFM

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FERROELECTRIC AND MAGNETIC PROPERTIES OF PEROVSKITE STRUCTURED Bi_(1-x-y)Gd_(x)Ba_(y)Fe_(1-y)Ti_(y)O_(3)MAGNETOELECTRIC CERAMICS

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Journal of Advanced Dielectrics 2011年第2期1卷 257-267页

作者： RADHESHYAM RAI igor bdikin M.A.VALENTE ANDREI L.KHOLKIN Department of Ceramics and Glass Engineering and CICECO University of Aveiro 3810-193 AveiroPortugal Centre for Mechanical Technology and Automation University of Aveiro 3810-193AveiroPortugal Department of Physics University of Aveiro 3810-193 AveiroPortugal

Ternary solid solutions of BiFeO_(3),GdFeO_(3)and BaTiO_(3)have been prepared by solid-state reaction *** properties of these ceramics have been characterized in the tem-perature range between room temperature and 673 K and magnetic properties between 5 K and *** the understanding of the multiferroic property,the relation between the crystal structures,magnetic transition and ferroelectric transitions with increasing temperature have been *** ceramic samples show single perovskite *** Ba content exceeds 0.2 wt%,the sintering ability is weakened and the phase structure of Bi_(1-x-y)Gd_(x)Ba_(y)Fe_(1-y)Ti_(y)O_(3)(with x=0.2 and y=0.1,0.2,0.3,0.4,0.5)solid solution changes from rhombohedral to tetragonal *** maximum ferroelectric transition temperature(T_(c))of this system was in the range 154-165℃with the dielectric constant peak of 6000 for y=0.5 at 100 ***-saturated piezoresponse hysteresis loops were observed for all compositions indicating room temperature *** increasing Ba content(up to 0.3 wt%)the remanent magnetization M,increased and the coercive magnetic field decreased.

关键词： Ceramics X-ray difraction dielectric properties electrical properties magnetic properties

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Self-Assembly of Amyloid-Beta and Its Piezoelectric Properties

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American Journal of Molecular Biology 2021年第1期11卷 1-14页

作者： Ivonne Rosales Laura Salazar Daniel Luna Alicia Negrón igor bdikin Brian J. Rodriguez Alejandro Heredia Departamento de Física y Química Teórica Facultad de Química Universidad Nacional Autónoma de México Ciudad Universitaria Circuito Exterior S/N Coyoacán Mexico City Mexico Laboratorio de Evolución Química Instituto de Ciencias Nucleares Universidad Nacional Autónoma de México Mexico City Mexico Nanoengineering Research group Centre for Mechanical Technology & Automation University of Aveiro Aveiro Portugal School of Physics and Conway Institute of Biomolecular and Biomedical Research University College Dublin Belfield Dublin Ireland

Investigating amyloid nanofibril self-assembly, with an emphasis on the electromechanical property of amyloid peptides, namely, piezoelectricity, may have several important implications: 1) the self-assembly process can hinder the biological stability and give rise to the formation of amyloid structures associated with neurodegenerative diseases;2) investigations in this field may lead to an improved understanding of high-performance, functional biological nanomaterials, 3) new technologies could be established based on peptide self-assembly and the resultant functional properties, e.g., in the creation of a piezoelectric device formed with vertical diphenylalanine peptide tubes as a piezoelectric biosensor, and 4) new knowledge can be generated about neurodegenerative disorders, potentially yielding new therapies. Therefore, in this review, we will present the current investigations associated with self-assembly of amyloid-beta, the mechanisms that generate new structures, as well as theoretical calculations exploring the functionality of the structures under physiological pressure and electric field.

关键词： Amyloid Neurodegenerative Disorders Self-Assembly Piezoelectricity

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