Deciphering Density Fluctuations in the Hydration Water of Brownian Nanoparticles via Upconversion Thermometry - Maturi, Fernando E; Raposo Filho, Ramon S; Brites, Carlos D S; Fan, Jingyue; He, Ruihua; Zhuang, Bilin; Liu, Xiaogang; Carlos, Luis D (Journal Of Physical Chemistry Letters, 2024)