Speaker
Description
Magnetic core-shell nanoparticles have emerged as highly versatile materials with a wide range of applications spanning biomedicine, catalysis, and sensor technologies. In biomedical fields, the magnetic core responds to external magnetic fields, enabling targeted drug delivery, magnetic hyperthermia, and efficient magnetic separation. To ensure biocompatibility, the magnetic core is typically encapsulated within a biocompatible organic compound or ligand shell. Furthermore, these modifying ligands can exhibit specific therapeutic functions, driving the development of advanced theranostic platforms that combine simultaneous diagnosis and treatment.
Designing these core-shell systems for optimal performance requires a comprehensive understanding of their structural properties. However, precise characterization remains a challenge; conventional methods such as X-ray scattering and electron microscopy lack sufficient sensitivity to light organic matter, making it difficult to accurately resolve the properties of the organic shell coating the core.
To overcome these limitations, small-angle neutron scattering (SANS) serves as a powerful and non-destructive diagnostic tool. Applicable to both powder samples and liquid dispersions, SANS provides the unique capability to determine the internal architecture of core-shell nanoparticles with angstrom-level precision. By utilizing contrast variation techniques (e.g., via isotopic substitution in the liquid medium), specific components of the nanoparticle can be selectively matched out or highlighted, allowing independent visualization of the core and the shell. This approach yields accurate data on the precise size of the magnetic core, the thickness of the organic coating, morphology, and size distribution. Additionally, SANS provides crucial insights into the ligand surface coverage density, interparticle interactions, and the presence, size, and geometry of aggregates within the dispersion. Consequently, SANS represents an indispensable method for the rational design and structural optimization of multifunctional nanocarriers.
