Optimal synthesis of polyelectrolyte nanogels by electrostatic assembly directed polymerization for dye loading and release. Issue 4 (25th November 2020)

• Record Type: Journal Article
• Authors: Ding, Peng; Liu, Wei; Guo, Xuhong; Cohen Stuart, Martien A.; Wang, Junyou
• Is Part Of: Soft matter. Volume 17:Issue 4(2021)
• Page Start: 887
• Page End: 892
• Publication Date: 2020-11-25
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/d0sm01715a
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : We fully address the process parameters of EADP regarding optimal and controlled preparation of PE nanogels. The response behaviour of the nanogels, and their take-up and release of charged dye molecule upon varying pH and salt are also investigated. Abstract : Polyelectrolyte (PE) nanogels which combine features of nanogels and polyelectrolytes have attracted significant attention as outstanding nano-carriers. However, and crucially, any large-scale application of PE nanogels can only materialize when an efficient production method is available. We recently developed such a robust approach, namely Electrostatic Assembly Directed Polymerization (EADP), in which ionic monomers are polymerized together with cross-linker in the presence of a polyion-neutral diblock copolymer as template. Although EADP achieves efficient and scalable preparation of diverse PE nanogels, the essential factors for the optimal and controlled synthesis of nanogels have remained elusive. In this article, we investigate systematically the effects of pH, salt concentration, and cross-linker fractions on the formation and properties of a PDMAEMA nanogel prepared with PAA- b -PEO as the template. We find that the electrostatic interaction between the building blocks is crucial to obtain assembly-controlled polymerization, and we establish preferred pH, salt concentration and cross-linker fractions. The obtained PDMAEMA nanogel exhibits dual-responses to pH and salt, which allow manipulation of the positive charges of the nanogels for selective loading and controlled release of anionic substances; we demonstrate this with an anionic dye. The study presented here fully addresses the process parameters of EADP regarding optimal and controlled preparation of PE nanogels, which should allow exploration of their potential vis-a-vis a variety of applications.