Smart nanomaterials have emerged as a pivotal class of materials due to their unique and tunable properties making them ideal candidates for advanced technological applications. This review focuses on the magnetic, transport, and surface properties of these materials, which play a crucial role in their functionality across diverse fields. The discussion begins with an overview of magnetic properties, highlighting the role of size, morphology, and composition in tailoring magnetism for applications such as data storage, biomedical imaging, and drug delivery. Next, the transport properties, including electrical and thermal conductivity are analyzed with emphasis on the mechanisms driving charge transport and their implications for electronic devices, sensors, and energy storage systems. The surface properties, including surface reactivity, wettability, and functionalization potential, are also explored, demonstrating their importance in catalysis, environmental remediation, and biomedical interfaces. A comprehensive analysis of recent advances, experimental techniques, and theoretical frameworks is provided to connect these properties to practical applications. Finally, the review identifies current challenges and prospects in the development of smart nanomaterials, emphasizing their role in next-generation technologies.

This work investigates the fabrication of barium bismuth titanate (BaBi4Ti4O15) ceramic and its incorporation into polyvinylidene fluoride (PVDF) to produce composite films via solution casting. Scanning electron microscope images reveal a distinct microstructure, with grains uniformly dispersed and grain boundaries clearly visible, suggesting that BBTO ceramic particles are evenly incorporated into the PVDF polymer matrix. At lower frequencies, the nearly 50-fold increase in dielectric constant with temperature is attributed to the growing influence of interfacial polarisation. When BaBi4Ti4O15 (BBTO) is added to the PVDF matrix, the AC conductivity decreases dramatically, providing evidence for a prospective energy storage opportunity. Moreover, the work established the stability and compatibility of the composite by confirming that BBTO does not impact the β phase of PVDF. An impedance spectroscopic study revealed that upon dilution, both BBTO and PVDF samples exhibited a single partially formed semicircle, suggesting a combination of the electrode effect on conduction and grain boundary resistance. Therefore, the dielectric response, AC conductivity, and impedance behaviour of the PVDF-BBTO composites are mainly determined by interfacial polarisation in the double layer and by the thermally activated motion of the PVDF polymer chains. This work initiated a deeper understanding of the ceramic PVDF structure and its potential as a dielectric capacitor.

Lanthanum manganite (LaMnO₃) and its doped derivatives have become an important class of perovskite materials due to their adaptable structural, electronic, and magnetic properties. A-site substitution with rare-earth elements and alkaline-earth elements has been shown to manipulate the Mn³⁺/Mn⁴⁺ ratio, alter oxygen vacancy concentrations, and perturb lattice distortions; all of this can impact conductivity, catalytic activity, and magnetism. These properties render a wide variety of applications appealing for doped LaMnO₃ materials, including solid oxide fuel cells, catalysis, spintronics, and energy storage. Even so, several challenges have limited their broader use, such as secondary-phase formation, electrolyte reactivity, dopant segregation, and processing at high temperatures. This article discusses advancements toward addressing these challenges with synthesis, defect engineering, and computational methods. Additionally, it reflects on the potential of new tools (machine learning and nanoscale design) to speed up the discovery of optimized compositions and processing conditions. Despite present problems, doped LaMnO₃ perovskites remain a promising material for energy and electrical applications.