Preparation of Composite Particles via Electroless Nickel Plating on Polystyrene Microspheres and Effect of Plating Conditions

김병철,; 박진홍,; 이성재,

doi:10.7317/pk.2010.34.1.25

Cited by 2 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While there are methods available in the existing literature, to apply a metal coating to colloidal objects (mostly solid particles), − the simple three-step method proposed here allows for a full metal coating to efficiently encapsulate small volatile actives in their liquid form. Two other recent articles also report the use liquid core objects to deposit a metal coating. , In the first example, Patchan et al sequentially adsorb multiple layers of polyelectrolyte, followed by tin and palladium ions before the target surface is suitable for metal deposition .…”

Section: Introductionmentioning

confidence: 99%

Long-Term Retention of Small, Volatile Molecular Species within Metallic Microcapsules

Hitchcock

Tasker

Baxter

et al. 2015

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Encapsulation and full retention of small molecular weight active ingredients is a challenging task that remains unsolved by current technologies used in industry and academia. In particular, certain everyday product formulations provide difficult environments in which preventing active leakage through capsule walls is not feasible. For example, a continuous phase that can fully dissolve an encapsulated active will typically force full release over a fraction of the intended lifetime of a product. This is due to the inherent porosity of polymeric membranes typically used as capsule wall material in current technologies. In this study, we demonstrate a method for preventing undesired loss of encapsulated actives under these extreme conditions using a simple threestep process. Our developed methodology, which forms an impermeable metal film around polymer microcapsules, prevents loss of small, volatile oils within an ethanol continuous phase for at least 21 days while polymeric capsules lose their entire content in less than 30 min under the same conditions. Polymer shell-oil core microcapsules are produced using a well-known cosolvent extraction method to precipitate a polymeric shell around the oil core. Subsequently, metallic catalytic nanoparticles are physically adsorbed onto the microcapsule polymeric shells. Finally, this nanoparticle coating is used to catalyze the growth of a secondary metallic film. Specifically, this work shows that it is possible to coat polymeric microcapsules containing a model oil system or a typical fragrance oil with a continuous metal shell. It also shows that the coverage of nanoparticles on the capsule surface can be controlled, which is paramount for obtaining a continuous impermeable metal film. In addition, control over the metal shell thickness is demonstrated without altering the capability of the metal film to retain the encapsulated oils.

show abstract