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Influence of shape, size and magnetostatic interactions on the hyperthermia properties of permalloy nanostructures.

ABSTRACT: We present a detailed study of permalloy (Ni₈₀Fe₂₀) nanostructures with variable shape (disk, cylinder and sphere) for magnetic hyperthermia application, exploiting hysteresis losses for heat release. The study is performed modifying nanostructure aspect ratio and size (up to some hundreds of nanometres), to find the optimal conditions for the maximization of specific heating capabilities. The parameters are also tuned to guarantee negligible magnetic remanence and fulfilment of biophysical limits on applied field amplitude and frequency product, to avoid aggregation phenomena and intolerable resistive heating, respectively. The attention is first focused on disk-shaped nanostructures, with a comparison between micromagnetic simulations and experimental results, obtained on nanodisks still attached on the lithography substrate (2D array form) as well as dispersed in ethanol solution (free-standing). This analysis enables us to investigate the role of magnetostatic interactions between nanodisks and to individuate an optimal concentration for the maximization of heating capabilities. Finally, we study magnetization reversal process and hysteresis properties of nanocylinders (diameter between 150?nm and 600?nm, thickness from 30?nm up to 150?nm) and nanospheres (size between 100?nm and 300?nm), to give instructions on the best combination of geometrical parameters for the design of novel hyperthermia mediators.

SUBMITTER: Ferrero R

PROVIDER: S-EPMC6488611 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Influence of shape, size and magnetostatic interactions on the hyperthermia properties of permalloy nanostructures.

Ferrero Riccardo R Manzin Alessandra A Barrera Gabriele G Celegato Federica F Coïsson Marco M Tiberto Paola P

Scientific reports 20190429 1

We present a detailed study of permalloy (Ni<sub>80</sub>Fe<sub>20</sub>) nanostructures with variable shape (disk, cylinder and sphere) for magnetic hyperthermia application, exploiting hysteresis losses for heat release. The study is performed modifying nanostructure aspect ratio and size (up to some hundreds of nanometres), to find the optimal conditions for the maximization of specific heating capabilities. The parameters are also tuned to guarantee negligible magnetic remanence and fulfilme ...[more]

PMID: 31036894

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Project description:BackgroundJudgements of volume may influence the rate of consumption of alcohol and, in turn, the amount consumed. The aim of the current study was to examine the impact of the size and shape of wine glasses on perceptions of wine volume.MethodsOnline experiment: Participants (n = 360; recruited via Mechanical Turk) were asked to match the volume of wine in two wine glasses, specifically: 1. the Reference glass holding a fixed reference volume, and 2. the Comparison glass, for which the volume could be altered until participants perceived it matched the reference volume. One of three comparison glasses was shown in each trial: 'wider' (20% wider but same capacity); 'larger' (same width but 25% greater capacity); or 'wider-and-larger' (20% wider and 25% greater capacity). Reference volumes were 125 ml, 175 ml and 250 ml, in a fully factorial within-subjects design: 3 (comparison glass) x 3 (reference volume). Non-zero differences between the volumes with which participants filled comparison glasses and the corresponding reference volumes were identified using sign-rank tests.ResultsParticipants under-filled the wider glass relative to the reference glass for larger reference volumes, and over-filled the larger glass relative to the reference glass for all reference volumes. Results for the wider-and-larger glass showed a mixed pattern across reference volume. For all comparison glasses, in trials with larger reference volumes participants tended to fill the comparison glass less, relative to trials with smaller reference volumes for the same comparison glass.ConclusionsThese results are broadly consistent with people using the relative fullness of glasses to judge volume, and suggest both the shape and capacity of wine glasses may influence perceived volume. Perceptions that smaller glasses contain more than larger ones (despite containing the same volume), could slow drinking speed and overall consumption by serving standard portions in smaller glasses. This hypothesis awaits testing.

Dataset Information

Influence of shape, size and magnetostatic interactions on the hyperthermia properties of permalloy nanostructures.

Publications

Influence of shape, size and magnetostatic interactions on the hyperthermia properties of permalloy nanostructures.

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