Small-angle neutron scattering study of the short-range organization of dispersed CsNi[Cr(CN){sub 6}] nanoparticles

Journal Article · Mon Sep 21 00:00:00 EDT 2015 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4930935· OSTI ID:22489496

Ridier, Karl; Gillon, Béatrice; André, Gilles; Chaboussant, Grégory ^[1]; Catala, Laure; Mazérat, Sandra; Mallah, Talal ^[2]

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1. Laboratoire Léon Brillouin, UMR12 CEA-CNRS, 91191 Gif-sur-Yvette (France)
2. Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS, Université Paris-Sud, 91405 Orsay (France)

Prussian blue analogues magnetic nanoparticles (of radius R{sub 0} = 2.4–8.6 nm) embedded in PVP (polyvinylpyrrolidone) or CTA{sup +} (cetyltrimethylammonium) matrices have been studied using neutron diffraction and small angle neutron scattering (SANS) at several concentrations. For the most diluted particles in neutral PVP, the SANS signal is fully accounted for by a “single-particle” spherical form factor with no structural correlations between the nanoparticles and with radii comparable to those inferred from neutron diffraction. For higher concentration in PVP, structural correlations modify the SANS signal with the appearance of a structure factor peak, which is described using an effective “mean-field” model. A new length scale R{sup * }≈ 3R{sub 0}, corresponding to an effective repulsive interaction radius, is evidenced in PVP samples. In CTA{sup +}, electrostatic interactions play a crucial role and lead to a dense layer of CTA{sup +} around the nanoparticles, which considerably alter the SANS patterns as compared to PVP. The SANS data of nanoparticles in CTA{sup +} are best described by a core-shell model without visible inter-particle structure factor.

• OSTI ID: 22489496
• Journal Information: Journal of Applied Physics, Vol. 118, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CARBON NITRIDES
CORRELATIONS
CYANIDES
FERROCYANIDES
FORM FACTORS
LAYERS
MEAN-FIELD THEORY
NANOPARTICLES
NEUTRON DIFFRACTION
POTASSIUM COMPOUNDS
PVP
SMALL ANGLE SCATTERING
STRUCTURE FACTORS