Correct option is D
Hydrogels are networks of polymer chains that can hold a large amount of water while maintaining their structure. Because of their unique properties, hydrogels have a wide range of applications across different fields.
1. Controlled drug delivery in patients: Hydrogels are widely used in the field of medicine, particularly in controlled drug delivery systems. They can be designed to release drugs slowly over time in response to specific stimuli (such as pH or temperature changes). This controlled release capability is particularly valuable in targeted drug delivery systems, where the gel can release the medication directly at the site where it is needed.
2. Mobile air-conditioning systems: Hydrogels have applications in mobile air-conditioning systems due to their ability to absorb and release large amounts of water. Some advanced air-conditioning systems utilize hydrogels for evaporative cooling, where the hydrogel absorbs moisture and releases it as cool air, improving the efficiency of the cooling system.
3. Preparation of industrial lubricants: Hydrogels can be used in the formulation of industrial lubricants. Their ability to retain water and maintain a stable structure under varying conditions makes them useful as thickeners or viscosity modifiers in lubricants. They can help in reducing friction and wear in mechanical systems by forming a lubricating layer.
