nanogel

Also contains definition of: gel nanoparticle

Particle of gel of any shape with an equivalent diameter of approximately 1 to 100 nm.
Source:
PAC, 2007, 79, 1801 (Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007)) on page 1807