Fig. 2. (A) Turbidity measurement of thermogelling nanoparticles (1.0 mg mL⁻¹ in deionized water) demonstrating an increase in transition temperature with the increase of acrylic acid. Hydrogel nanoparticles dispersed in PBS (ionic strength: 43.5 mM) have lower transition temperatures than with deionized water. (B) Inversed particle sample (PMOA3) in a test tube illustrating that the hydrogel nanoparticles (60 mg mL⁻¹) form gel at physiological temperature. (C) Rheometry measurement of thermogelling nanoparticles (60 mg mL⁻¹) demonstrating the viscosity as a function of temperature.