Nanogels are nano-sized hydrogel networks formed by chemically or physically crosslinked polymer particles. Their colloidal stability affords them as good candidates for drug delivery systems. Like nanoparticles, nanogels are injectable and responsive to environmental factors, such as ionic strength, pH, and temperature. Encapsulation stability is an important feature that needs to be addressed when designing a drug delivery vehicle. Accidental leakage of drug molecules during circulation into the healthy cells causes a nearly empty vehicle arrive at the disease site. To solve this problem a nano-carrier as nanogels is introduced. Here, we introduce nanogels, and their important synthesis methods as well as their related properties as drug carriers.
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