Recent Advances in the Applications of Smart Nanomaterials in Biomedicine: A Review.

Smart materials are engineered to perceive and respond dynamically to external stimuli, enabling controlled and adaptive changes in their properties. These materials, including metals and smart composites, have found extensive applications across various industrial sectors. In the field of nanotechnology, "smart nanomaterials" are specifically designed to exhibit stimuli-responsive behavior, allowing precise modulation of their physicochemical properties in response to environmental triggers such as pH, temperature, light, magnetic fields and biomolecular interactions. This unique adaptability makes them highly promising for biomedical, environmental and technological applications. Nanomaterials inherently possess exceptional physicochemical attributes, including enhanced surface area-to-volume ratio, tunable plasmonic and quantum effects, superior molar extinction coefficients, and unique magnetic and optical properties, which contribute to their multifunctionality. Despite these advantages, the biomedical deployment of conventional nanomaterials remains challenging due to limited biocompatibility, poor photostability, suboptimal targeting efficiency, rapid renal clearance, potential off-target toxicity, inadequate cellular uptake and low systemic circulation retention. These limitations necessitate the development of next-generation smart nanomaterials with precisely regulated functionalities to overcome these constraints and optimize therapeutic efficacy. Recent advancements in nanotechnology have led to the emergence of stimuli-responsive smart nanomaterials, which undergo significant and reversible modifications in their structural, chemical, or biological properties in response to subtle environmental perturbations. These innovations have enabled breakthroughs in targeted drug delivery, bioimaging, regenerative medicine and biosensing. This review provides a comprehensive analysis of the latest developments in stimuli-sensitive smart nanomaterials, emphasizing their biomedical applications, potential advantages and existing challenges in clinical translation. [ABSTRACT FROM AUTHOR]