“…The formation of coordination bonds between polyelectrolyte blocks and metal ions in the C3M core, has been studied by attenuated total reflectance infrared spectroscopy (ATR-FTIR) [156]. Atomic force microscopy (AFM), [15,87,106,[184][185][186]199,231,241] transmission electron microscopy (TEM), [63,68,136,138,158,166,178,184,229] and cryogenic transmission electron microscopy (cryo-TEM) [3,45,[152][153][154]181,182] have been used to visualize (the core of) C3Ms. Potentiometric titrations have been performed to study the binding equilibrium between the oppositely charged species [68].…”