Unravelling the polyethylenimine mediated non-monotonic stability behaviour of silica colloids: the role of competing electrostatic and entropic interactions

Abstract

Polymer-mediated interactions play an important role in the stability of the colloids and therefore, are paramount for both fundamental as well as scientific interests. The stability of the colloids in...

Polyethyleneimine-assisted formation of Ag–SiO2 hybrid microspheres for H2O2 sensing and SERS applications

“…This non-monotonic behavior in silica–PEI microspheres could be attributed to the complex interactions involved between the silica nanoparticles and PEI. 56 Since, there was a correlation between the volume fraction and porosity of the silica–PEI microspheres, therefore the porosity of the microspheres increased at moderate PEI loadings. The increased porosity help the adsorption of Ag ions in the microspheres during the formation of silver nanoparticles.…”

Interparticle interaction-dependent jamming in colloids: insights into glass transition and morphology modulation during rapid evaporation-induced assembly

“…2c(i)] is governed by DLVO (Derjaguin, Landau, Verwey, Overbeek) interactions, which is sum of van der Waals attraction and electric double layer repulsion. 26 A schematic representing the detailed interactions in the DLVO potential is shown in Fig. S3 in the ESI †.…”

“…[19][20][21][22][23][24][25] Cationic polyethyleneimine (PEI) has been demonstrated to exhibit highly tunable reentrant interactions with negatively charged silica colloids, spanning from repulsive to attractive and back to repulsive interactions via non-monotonic pathways. 26 The evaporation process of colloidal dispersions provides an effective means to increase the volume fraction of colloids in a controlled manner. [27][28][29] Colloidal droplet drying is particularly well-suited for studying jamming behavior and glass transition phenomena.…”

“…19–25 Cationic polyethyleneimine (PEI) has been demonstrated to exhibit highly tunable reentrant interactions with negatively charged silica colloids, spanning from repulsive to attractive and back to repulsive interactions via non-monotonic pathways. 26…”