English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Controlled assembly of single-crystal, colloidal maghemite nanoparticles isfacilitated via a high-temperature polyol-based pathway. Structuralcharacterization shows that size-tunable nanoclusters of 50 and 86 nm diameters(D), with high dispersibility in aqueous media, are composed of $\sim$ 13 nm(d) crystallographically oriented nanoparticles. The interaction effects areexamined against the increasing volume fraction, $\phi$, of the inorganicmagnetic phase that goes from individual colloidal nanoparticles ($\phi$= 0.47)to clusters ($\phi$= 0.72). The frozen-liquid dispersions of the latter exhibitweak ferrimagnetic behavior at 300 K. Comparative Mossbauer spectroscopicstudies imply that intra-cluster interactions come into play. A new insightemerges from the clusters temperature-dependent ac susceptibility that displaystwo maxima in $\chi$''(T), with strong frequency dispersion. Scaling-lawanalysis, together with the observed memory effects suggest that a superspinglass state settles-in at T$_{B}$ $\sim$ 160-200 K, while atlower-temperatures, surface spin-glass freezing is established at T$_{f}$$\sim$40- 70 K. In such nanoparticle-assembled systems, with increased $\phi$,Monte Carlo simulations corroborate the role of the inter-particle dipolarinteractions and that of the constituent nanoparticles surface spin disorder inthe emerging spin-glass dynamics.

Assembly-mediated Interplay of Dipolar Interactions and Surface Spin Disorder in Colloidal Maghemite Nanoclusters