Vacuum heating of the layered compounds of lithium–aluminium double hydroxide pillared with copper, cobalt, and nickel complexes of ethylenediamine tetraacetic acid (EDTA) was shown to give rise to composite materials containing in the lamellar aluminate matrix nanosized metal particles stable to oxidation. High-resolution electron microscopy (HREM), powder X-ray diffraction (XRD), and small-angle X-ray scattering (SAXS) were used to determine the morphology of the resulting products. Their magnetic properties were studied by magnetic weighing.

Formation of Nanosized Metal Particles of Cobalt, Nickel, and Copper in the Matrix of Layered Double Hydroxide

Self-aggregation of rigid-rod poly(sodium p-phenylenesulfonate) in aqueous solution and inside water-swollen polyacrylamide gel was studied by small-angle neutron scattering. It was shown that both inside the hydrogel and in solution polyelectrolyte rods self-assemble into cylindrical aggregates having eight to nine single polymer chains in the cross-section, the chains being aligned parallel to the axis of the aggregate. The length of these aggregates is much higher than the contour length of a single chain. Gels with embedded rods were studied by contrast variation method in order to examine separately the scattering by the gel and by the rods. Two important observations were made. First, it was shown that the ordering of the rods in the gel resembles that in solution. Second, it was shown that the gel itself is more homogeneous in the presence of rods. Most probably, this effect is due to mobile counterions of rods, which counteract the formation of spatial inhomogeneities in the network during synthesis, because in an inhomogeneous network mobile counterions should be also distributed nonuniformly that is associated with significant translational entropy losses.

/pdf/self-assembly-of-polyelectrolyte-rods-in-polymer-gel-and-in-2xlxbbkt3a.pdf

Self-assembly of polyelectrolyte rods in polymer gel and in solution: small-angle neutron scattering study

Polyacrylamide hydrogels with trapped sulfonated polyaniline

Structural characterization of concentrated aqueous ferrofluids

Peculiarities of CeO 2 nanoparticle coarsening during hydrothermal treatment in a neutral medium are determined by small-angle neutron scattering, powder X-ray diffraction, low-temperature nitrogen adsorp- tion, and transmission electron microscopy. Coherent intergrowth of individual CeO 2 crystallites is the main scenario of nanoparticle coarsening.

https://lns.pnpi.spb.ru/media/ceo/CeO2009a.pdf

Hydrothermal growth of ceria nanoparticles

When radiation (light, electrons, x-rays, neutrons) passes through matter the inhomogeneities of “density” induce its scattering. This is the phenomenon which makes objects visible through different optical properties from that of the surrounding medium. This observation implies for quantitative analysis the precise definition of density, optical properties and inhomogeneities.

X-ray and neutron small angle scattering

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X-ray and neutron small angle scattering