One of the situations in the treatment of disease is the delivery of efficacious medication of appropriate concentration to the site of action in a controlled and continual manner. Nanoparticle represents an important particulate carrier system, developed accordingly. Nanoparticles are solid colloidal particles ranging in size from 1 to 1000 nm and composed of macromolecular material. Nanoparticles could be polymeric or lipidic (SLNs). Industry estimates suggest that approximately 40% of lipophilic drug candidates fail due to solubility and formulation stability issues, prompting significant research activity in advanced lipophile delivery technologies. Solid lipid nanoparticle technology represents a promising new approach to lipophile drug delivery. Solid lipid nanoparticles (SLNs) are important advancement in this area. The bioacceptable and biodegradable nature of SLNs makes them less toxic as compared to polymeric nanoparticles. Supplemented with small size which prolongs the circulation time in blood, feasible scale up for large scale production and absence of burst effect makes them interesting candidates for study. In this present review this new approach is discussed in terms of their preparation, advantages, characterization and special features.

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α‐Fe2O3 and α‐Fe2O3/graphene oxide (GO) nanocomposites are synthesized by solvothermal method in acetonitrile medium at 200 °C. XRD studies reveals the formation of α‐Fe2O3 and α‐Fe2O3/GO nanocomposites. Raman studies indicate that GO in α‐Fe2O3/GO system was more disordered than GO. The enhanced low temperature magnetic saturation and coercivity in α‐Fe2O3 and α‐Fe2O3/GO are related to frozen canted spins. Blocking temperature of α‐Fe2O3/GO is 348 K, which also shows higher coercivity of the order of about 3064 Oe at 5 K. The α‐Fe2O3/GO composite exhibits thermal hysteresis at Morin transition (ΔTM = 11 K).

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