A hydrogel is mostly water, held together by a polymer network. Doctors use it to release drugs slowly inside the body — but it can’t cool your car’s air-conditioning.
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What Hydrogels Are Actually Used For
Real applications vs a common UPSC trap
Controlled Drug DeliveryREAL USE
Wound Dressings & Contact LensesREAL USE
Mobile Air-ConditioningNOT A USE
Industrial LubricantsNOT A USE
Why not: hydrogels are about 90% water. They lack the thermodynamic properties AC systems need, and can’t survive the pressure and heat that real industrial lubricants must withstand.
🏛️ Must Know
What Hydrogels Are
- Mostly Water Hydrogels are polymer networks that are about 90% water, highly porous, and able to absorb and hold large amounts of water.
- Drug Delivery Controlled drug delivery in patients is a genuine, well-established use of hydrogels. Their tunable, biocompatible structure lets them release medication at a controlled rate.
- Not for AC or Lubricants Hydrogels are not used in mobile air-conditioning systems or the preparation of industrial lubricants. They lack the thermodynamic properties AC systems need, and cannot withstand the pressure and heat industrial lubricants must handle.
🏘️ Good to Know
Other Real Applications
- Wound Dressings Hydrogels are used in wound dressings, keeping the wound moist and promoting cell migration, which speeds healing.
- Contact Lenses Hydrogels are also used in contact lenses. Their hydrated, gas-permeable structure lets oxygen reach the cornea.
- Origin The first hydrogel polymer usable for contact lenses was developed in the 1950s-60s, based on poly-2-hydroxyethyl methacrylate (PHEMA).
- Tissue Engineering Hydrogels are also used in tissue engineering, where their water-rich structure mimics the natural environment of living cells.
Test Yourself
Previous Year Questions
- On genuine hydrogel applications, asked as: “In which of the following are hydrogels used?” (UPSC CSP 2024, GS Paper I).
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