Liquid-Filled Metal Microcapsules

Abstract

A moisture-sensitive diisocyanate liquid is microencapsulated within a metal shell measuring less than 2 μm thick and 50 μm in diameter. This mild synthesis takes place through a series aqueous processing steps that occur at or near room temperature. Through a combination of emulsification, interfacial polymerization, and electroless plating, one can microencapsulate moisture- or air-sensitive chemicals within a metal seal. The liquid-filled metal microcapsules promise a number of advantages compared to conventional polymeric microencapsulation, including improved mechanical properties and improved barrier properties to gases and organic molecules.

Self-healing polymeric materials based on microencapsulated healing agents: From design to preparation

“…Therefore, a method for large-scale production of IPDI-contained nickel microcapsules was proposed [141]. The synthesis method involves a series of aqueous-based processing steps that combined emulsification, interfacial polymerization, and electroless plating techniques (Fig.…”

“…Moreover, the introduction of healing chemistries of broader applicability, higher stability and reactivity, and faster kinetics [34] affords the use of integrated encapsulation techniques to construct microcapsules with sophisticated structures including multilayered capsules [134] and capsule-in-capsule systems [154]. Inorganic materials (e.g., silica [176] and glass [181]) and even metals [141] have been employed to construct capsule shell walls, thereby providing much lower permeability and improved durability. Continuing studies are being conducted to develop heat-resistant healing agent capsules for the fabrication of high-performance self-healing thermosetting composites [132,206,239].…”

Microcapsule-based self-healing materials

“…Accordingly, not only reactive chemicals but also functional fluids without chemical activity (like suspension of carbon nanotubes [96]) act as the microencapsulated healing agent. Inorganic materials (like silica and glass) and even metal [31] are employed to build up capsules' shell wall, providing much lower permeability and improved durability. In the case of thermoplastics, melt mixing of specially designed microencapsulated healing agent and matrix polymer proves to be feasible [25,81], which might eventually replace the environmentally unfriendly solution blending and casting.…”

“…Patchan et al [31] presented a method for producing IPDIfilled nickel microcapsules in large quantities. The synthesis contained a series of aqueous processing steps through a combination encapsulation technique of interfacial polymerization and electroless plating.…”

Hybrid Zinc-Rich Paint Coatings

“…51 However, on the other hand, there were studies reporting lower corrosion resistivity of metals when connected to CNTs, [52][53][54][55] which was interpreted on the basis of microgalvanic action between metallic matrixes and the CNTs. 58 Nevertheless, performance of this technology is not yet comparable to liquid ZRPs. 56 Galvanic corrosion can even occur when moisture absorption can take place through the epoxy outer-layer matrix to the graphite fibers.…”