nanosphere

https://doi.org/10.1351/goldbook.13914
Nanoparticle of spherical shape without membrane or any distinct outer layer.
Note: A nanosphere is composed of a matrix where substances can be permanently or temporarily embedded, dissolved, or covalently bound.
Source:
PAC, 2012, 84, 377. (Terminology for biorelated polymers and applications (IUPAC Recommendations 2012)) on page 394 [Terms] [Paper]