Stimuli-Responsive Intelligent Hydrogels

Recent progress in materials science has led to the emergence of stimuli-responsive intelligent hydrogels, which have gained significant interest due to their unique properties and wide-ranging applications. These hydrogels undergo reversible changes in physical or chemical properties when exposed to external stimuli like temperature, pH, light, electric fields, and biomolecules. Their potential spans biomedical engineering, drug delivery, soft robotics, and environmental sensing. This paper explores their synthesis, properties, and applications. Various stimuli can trigger hydrogel responsiveness, with the choice depending on the application. We discuss methods for incorporating stimuli-responsive elements, including physical entrapment, covalent attachment, and self-assembly. Fabrication techniques such as physical and chemical crosslinking are examined, along with the importance of structure-property relationships in designing precise, responsive hydrogels.