Electromagnetic screening in soft conducting composite-containing ferrites: the key role of size and shape anisotropy

2017 ◽  
Vol 1 (12) ◽  
pp. 2574-2589 ◽  
Author(s):  
Sourav Biswas ◽  
Injamamul Arief ◽  
Sujit S. Panja ◽  
Suryasarathi Bose
Keyword(s):  
Shape Anisotropy ◽  
Bottom Up ◽  
Conducting Composite ◽  
Size And Shape ◽  
Synthetic Procedure ◽  
Different Shapes ◽  
Shielding Properties ◽  
Size Controlled ◽  
Electromagnetic Screening

We explored a facile bottom-up synthetic procedure to fabricate different shapes and size controlled Fe3O4 nanoparticles and showed the effect of shape anisotropy and size on the EM shielding properties.

scholarly journals On the Reaction Pathways and Growth Mechanisms of LiNbO3 Nanocrystals from the Non-Aqueous Solvothermal Alkoxide Route

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 154
Author(s):  
Mathias Urbain ◽  
Florian Riporto ◽  
Sandrine Beauquis ◽  
Virginie Monnier ◽  
Jean-Christophe Marty ◽  
...  
Keyword(s):  
Colloidal Stability ◽  
Formation Rate ◽  
Reaction Medium ◽  
Precursor Solution ◽  
Medium Composition ◽  
Shape Anisotropy ◽  
Reaction Pathways ◽  
Growth Mechanisms ◽  
Shape Distribution ◽  
Size And Shape

Phase-pure, highly crystalline sub-50 nm LiNbO3 nanocrystals were prepared from a non-aqueous solvothermal process for 72 h at 230 °C and a commercial precursor solution of mixed lithium niobium ethoxide in its parent alcohol. A systematic variation of the reaction medium composition with the addition of different amounts of co-solvent including butanol, 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol resulted in the formation of nanocrystals of adjustable mean size and shape anisotropy, as demonstrated from XRD measurements and TEM imaging. Colloidal stability of ethanol- and water-based suspensions was evaluated from dynamic light scattering (DLS)/zeta potential studies and correlated with FTIR data. Thanks to the evolution in the nanocrystal size and shape distribution we observed, as well as to the available literature on the alkoxide chemistry, the reaction pathways and growth mechanisms were finally discussed with a special attention on the monomer formation rate, leading to the nucleation step. The polar, non-perovskite crystalline structure of LiNbO3 was also evidenced to play a major role in the nanocrystal shape anisotropy.

Sensory regulation of quadrupedal locomotion: a top-down or bottom-up control system?

2012 ◽  
Vol 108 (3) ◽  
pp. 709-711 ◽  
Author(s):  
Yann Thibaudier ◽  
Marie-France Hurteau
Keyword(s):  
Control System ◽  
Central Pattern Generators ◽  
Top Down ◽  
Bottom Up ◽  
Sensory Inputs ◽  
Sensory Regulation ◽  
Before And After ◽  
Pattern Generators

Propriospinal pathways are thought to be critical for quadrupedal coordination by coupling cervical and lumbar central pattern generators (CPGs). However, the mechanisms involved in relaying information between girdles remain largely unexplored. Using an in vitro spinal cord preparation in neonatal rats, Juvin and colleagues ( Juvin et al. 2012 ) have recently shown sensory inputs from the hindlimbs have greater influence on forelimb CPGs than forelimb sensory inputs on hindlimb CPGs, in other words, a bottom-up control system. However, results from decerebrate cats suggest a top-down control system. It may be that both bottom-up and top-down control systems exist and that the dominance of one over the other is task or context dependent. As such, the role of sensory inputs in controlling quadrupedal coordination before and after injury requires further investigation.

Effect of size and shape of nanofillers on electrostatic and thermal behavior of epoxy-based composites

2021 ◽  
pp. 096739112110324
Author(s):  
Mihir N Velani ◽  
Ritesh R Patel
Keyword(s):  
Thermal Properties ◽  
Breakdown Strength ◽  
Electrical Power ◽  
Filler Loading ◽  
Filler Concentration ◽  
Computational Technique ◽  
Electrical Power System ◽  
Potential Applications ◽  
Different Shapes

The role of nanodielectrics in the electrical power system is becoming crucial owing to its superior properties and potential applications in the field. Yet, the materials face limited breakdown strength and thermal properties. Further, the nanodielectrics have not found a comprehensive commercial platform because of the costly manufacturing process, and characterization and testing facilities. Therefore, to reduce the involved cost, in this work, an FE (finite element) based computational technique has been implemented to visualize the effect of shape, size, and filler concentration under the application of high voltage (HV). The epoxy-based nanodielectrics have been modeled incorporating a range of different shapes and size nanofillers—Al2O3, BN, BeO, SiO2, and TiO2. The paper discusses the 2D-analysis of the modeled nanodielectric in the steady-state electrostatic fields and thermal domains. It shows the insights of the nanofillers’ choice to ensure a perfect blend of electrical and thermal properties. The epoxy with square-shaped BeO fillers showed a rise in the electric field of nearly 1.5 times than unfilled neat epoxy, which indicates a significant surge in thermal conductivity at specific filler loading.

Parsing a plethora of pollen: the role of pollen size and shape in the evolution of Boraginaceae

Cladistics ◽  
2021 ◽  
Author(s):  
Maryam Noroozi ◽  
Farrokh Ghahremaninejad ◽  
David Bogler ◽  
Jocelyn M. Witherspoon ◽  
Gillian L. Ryan ◽  
...  
Keyword(s):  
Pollen Size ◽  
Size And Shape

Structural, mechanical, radiation shielding properties and albedo parameters of alumina borate glasses: Role of CeO2 and Er2O3

2022 ◽  
Vol 276 ◽  
pp. 115519
Author(s):  
Abuzer Acikgoz ◽  
Gokhan Demircan ◽  
Demet Yılmaz ◽  
Bulent Aktas ◽  
Serife Yalcin ◽  
...  
Keyword(s):  
Radiation Shielding ◽  
Borate Glasses ◽  
Shielding Properties ◽  
Alumina Borate

scholarly journals Cyclodextrins tethered with oligolactides – green synthesis and structural assessment

2017 ◽  
Vol 13 ◽  
pp. 779-792 ◽  
Author(s):  
Cristian Peptu ◽  
Mihaela Balan-Porcarasu ◽  
Alena Šišková ◽  
Ľudovít Škultéty ◽  
Jaroslav Mosnáček
Keyword(s):  
Ring Opening ◽  
Laser Desorption Ionization ◽  
Oh Groups ◽  
Soft Ionization ◽  
Light Scattering Detection ◽  
Synthetic Procedure ◽  
Evaporative Light Scattering ◽  
Green Procedure ◽  
Methylene Group

Biodegradable oligolactide derivatives based on α-, β- and γ-cyclodextrins (CDs) were synthesized by a green procedure in which CDs play the role of both the initiator and the catalyst. The synthetic procedure in which CDs and L-lactide (L-LA) are reacting in bulk at relatively high temperature of 110 °C was investigated considering the structural composition of the products. The obtained products were thoroughly characterized via mass spectrometry methods with soft ionization like matrix-assisted laser desorption ionization (MALDI) and electrospray ionization (ESI). Liquid chromatography (LC) separation with evaporative light scattering detection (ELSD) and NMR analysis were employed in order to elucidate the structural profiles of the obtained mixtures. The results clearly demonstrate that the cyclodextrins were tethered with more than one short oligolactate chain per CD molecule, predominantly at the methylene group, through ring opening of L-LA initiated by primary OH groups.

Magnetic tunneling junction based magnetic field sensors: Role of shape anisotropy versus free layer thickness

2011 ◽  
Vol 109 (7) ◽  
pp. 07C731 ◽  
Author(s):  
Lubna R. Shah ◽  
Nupur Bhargava ◽  
Sangcheol Kim ◽  
Ryan Stearrett ◽  
Xiaoming Kou ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Layer Thickness ◽  
Shape Anisotropy ◽  
Tunneling Junction ◽  
Free Layer ◽  
Magnetic Field Sensors ◽  
Magnetic Tunneling Junction ◽  
Magnetic Tunneling
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