Surface Modification of As-Prepared Silver-Coated Silica Microspheres through Mussel-Inspired Functionalization and Its Application Properties in Silicone Rubber

Abstract

A mussel-inspired functionalization method was developed to improve the dispersibility and compatibility of silver-coated silica (SiO2/Ag) microspheres in silicone rubber matrix; at the same time, the high conductivity of the microspheres was maintained. The poly­(dopamine) (PDA) layer was deposited on SiO2/Ag surface by spontaneous polymerization of dopamine. The SEM images showed that the SiO2/Ag/PDA microspheres are uniformly distributed and firmly integrated with silicone rubber. The PDA layers effectively improved the interfacial interaction between fillers and rubber matrix. The electrical resistivity of the SiO2/Ag/PDA/MVQ composites can be well controlled by adjusting the dopamine deposition time. Due to the favorable dispersibility and compatibility of the SiO2/Ag/PDA in the rubber matrix, the composites exhibited a dramatic increase in tensile strength (47%) and maintained their low electrical resistivity of 8.3 × 10–3 Ω·cm in the meanwhile at dopamine deposition time of 8 h. This approach can be extended to modify other particles to improve their compatibility in matrix.

Mechanically Robust and Recyclable Styrene–Butadiene Rubber Cross-Linked via Cu2+–Nitrogen Coordination Bond after a Tetrazine Click Reaction

“…Several strategies have been reported to construct noncovalent networks due to their readily breaking and re-forming characteristics, such as hydrogen bonds, ionic bonds, , and metal–ligand bonds (so-called coordination bonds or metal complexes). − Metal–ligand bonds are of the most practical interest among the various noncovalent bonds because the strength of the coordination bond is variable through the selection of metal salts and chemical design of ligand groups on polymer chains. − Furthermore, for the cooperative effect of strong and weak metal–ligand bonds, supramechanical performance could be achieved with simultaneous improvement of strength and stretchability . In addition, the dynamic reversible nature of metal complex networks also has the potential to impart extraordinary self-healing and recycling characteristics. − For instance, Valentine et al combined the sacrificial and reversible iron–catechol coordination bonds with covalent cross-link networks, which exhibit a 2–3 orders of magnitude increment in mechanical performance, including stiffness, tensile strength, and toughness. Li et al reported a highly stretchable autonomous self-healing elastomer via the coordination cross-links between 2,6-pyridinedicarboxamide ligands on poly (dimethylsiloxane) polymer chains and Fe­(III) through three different metal–ligand complexes: one strong pyridyl–iron bond and two weaker carboxamido–iron bonds.…”

Surface Modification of Stöber Silica Nanoparticles with Controlled Moiety Densities Determines Their Cytotoxicity Profiles in Macrophages

“…As among the most produced engineered nanomaterials, silica nanoparticles (NPs) were extensively used in various traditional industrial manufacturing products including plastics, rubbers, ceramics, pigments, coatings, and cosmetics. − Recently, due to their high surface area and better biodegradability, silica NPs were applied in many biomedical fields, for example, diagnosis, − bone regeneration scaffolds, , drug delivery carriers, , and cancer therapies. − With increasing industrial production and applications, the exposure of silica NPs gradually increases via dietary intake, skin contact, respiration, and systematic administration . Recently, studies demonstrated that the exposure of silica NPs could cause significant in vitro , and in vivo toxicities. , …”

Integrating Inflammation-Responsive Prodrug with Electrospun Nanofibers for Anti-Inflammation Application

“…The Cl content of the electrospun nanofibers' surfaces was investigated by EDS, which was carried out on a HORIBA X-Max20 detector (HORIBA Corporation, Kyoto, Japan) attached to the SEM. At the same time, the surface composition and functional groups of the electrospun nanofibers were investigated by XPS, which was performed on an ESCALAB 250 (Thermo Electron Corporation, Waltham, MA, USA) according to the previous report [48,49].…”