Platelet Janus Particles with Hairy Polymer Shells for Multifunctional Materials

Abstract

A novel approach is developed for the large-scale synthesis of Janus particles with platelet geometry and dense polymer shells by employing simultaneous "grafting from" of hydrophilic and hydrophobic polymers using surface-induced ATRP in emulsion. The method is based on the fabrication of an emulsion consisting of a water solution of a hydrophilic monomer and a solution of a hydrophobic monomer in an organic solvent, which is stabilized by initiator-modified kaolinite particles. Two polymers are grafted simultaneously on the opposite faces of the kaolinite particle during polymerization. The synthesized particles have a clear Janus character and are highly efficient for the stabilization of emulsions. Because of its simplicity, the method can readily be upscaled for the synthesis of large amounts of Janus particles, up to several grams.

Electrostatic‐Driven Dynamic Jamming of 2D Nanoparticles at Interfaces for Controlled Molecular Diffusion

“…As shown in Figure a, the pristine kaolinite was first treated with a synthetic bromo‐organosilane, prepared by a controlled bromination reaction of 3‐(trimethoxysilyl)propylmethacrylate (Supporting Information, Figure S1), forming multiple bromine functional groups on the platelet surface for the initiation of polymerization. Next, the surface‐modified kaolinite platelets were transferred to the oil–water interface where surface‐initiated atom‐transfer radical polymerization (SI‐ATRP) occurs, leading to a Janus‐type functionalization of kaolinite platelets. The morphology of SJPs was examined by field‐emission scanning electron microscope (FE‐SEM).…”

Janus graphene oxide nanosheets prepared via Pickering emulsion template

“…Some Janus particles in different dimensions have been successfully obtained via Pickering emulsion templates, including zero-dimensional (0D) Janus spheres [35][36][37] and two-dimensional (2D) Janus discs [12, 38,39]. 2D Janus particles arouse intense interest in the field of emulsification for their large adsorption energy and highly confined rotation at the oil-water interface [12, 15,40].…”

Electrostatic‐Driven Dynamic Jamming of 2D Nanoparticles at Interfaces for Controlled Molecular Diffusion

“…Hydrophobic poly(lauryl methacrylate) (PLMA) was simultaneously grafted on kaolinite platelets to enhance the affinity of NPs with oils.S uch strategy enables the robust intermolecular attraction of oppositely charged groups on SJPs at the locked state,w hile as trong electrostatic repulsion would arise upon fully protonated PDMAEMA polymers at low pH value,referring to the unlocked state.A ss hown in Figure 1a,t he pristine kaolinite was first treated with as ynthetic bromo-organosilane,p repared by ac ontrolled bromination reaction of 3-(trimethoxysilyl)propylmethacrylate (Supporting Information, Figure S1), forming multiple bromine functional groups on the platelet surface for the initiation of polymerization. Next, the surface-modified kaolinite platelets were transferred to the oil-water interface where surface-initiated atom-transfer radical polymerization (SI-ATRP) occurs, [18] leading to aJanus-type functionalization of kaolinite platelets. Them orphology of SJPs was examined by field-emission scanning electron microscope (FE-SEM).…”