Redox Responsive Release of Hydrophobic Self-Healing Agents from Polyaniline Capsules

Abstract

Redox-responsive nanocapsules consisting of conductive polyaniline and polypyrrole shells were successfully synthesized by using the interface of miniemulsion droplets as a template for oxidative polymerizations. The redox properties of the capsules were investigated by optical spectroscopies, electron microscopy, and cyclic voltammetry. Self-healing (SH) chemicals such as diglycidyl ether or dicarboxylic acid terminated polydimethylsiloxane (PDMS-DE or PDMS-DC) were encapsulated into the nanocapsules during the miniemulsion process and their redox-responsive release was monitored by (1)H NMR spectroscopy. The polyaniline capsules exhibited delayed release under oxidation and rapid release under reduction, which make them promising candidates for anticorrosion applications.

A Transparent, Highly Stretchable, Autonomous Self‐Healing Poly(dimethyl siloxane) Elastomer

“…To date, numerous applications of self‐healing materials have been demonstrated in a wide spectrum of fields spanning from self‐healing surface coatings and adhesives, drug and cell delivery systems, and chemical sensors to electronics . In general, completion of the self‐healing process mainly relies on the reformation of dynamically covalent bonds, supramolecular recognitions, or filling of the encapsulated repair agents . Compared with the latter two strategies, self‐healing materials that are based on the reversibly covalent bonds show more promising applications due to the higher mechanical strength, better stability at high humidity conditions, and minimum risk of chemical leakage.…”

Polypyrrole nanowire/TiO 2 nanotube nanocomposites as photoanodes for photocathodic protection of Ti substrate and 304 stainless steel under visible light

“…Some of the most common methods employed to achieve corrosion resistance are anticorrosion coatings [2][3][4], corrosion inhibitors [5,6], nanocomposites [7,8], and electrochemical protection [9][10][11][12]. Traditional electrochemical protection methods mainly include impressed current [9,11] and sacrificial anode cathodic protection systems [10,12].…”

Photo‐Decomposable Sub‐Micrometer Albumin Particles Cross‐Linked by ortho‐Nitrobenzyl Derivatives

“…Colloidal particles that can respond to stimuli on demand at the targeted sites or at specific time points have received extensive attention due to the versatility in biomedical fields, including gene/drug delivery, biosensors, and bioreactors . The stimuli‐response can be divided into internal stimuli (e.g., redox, pH, and enzyme) and external stimuli (e.g., light, magnetic, and ultrasound), and the most common approach to obtain stimuli‐response is the incorporation of various functional components into the colloidal particles.…”