Hydrophobic Nano‐Silica for the Surface Modification of Graphite Flake

Abstract

Graphite flake is an electromagnetic interference material of importance for IR screening. In this study, an attempt to improve the performance of graphite flake by coating it with nano‐silica using cyclomix (Hosokawa) and hybridizer (Nara) processes was made. Uncoated and coated graphite flakes were examined by scanning electron microscopy (SEM). It was shown that a more uniform coating was obtained using the hybridizer process. Coated graphite flake with a mass ratio of nano‐silica equal to 5.25 % exhibited the best hydrophobic properties. The test chamber experiments demonstrated that the deposition velocity of coated graphite flake decreased from 0.227 cm s−1 to 0.187 cm s−1 and its IR interference performance was improved, compared with uncoated graphite flake. The obtained results showed that the coatings on the graphite flake powder with hydrophobic nano‐silica enhanced the moisture resistance and electromagnetic interference performance of the graphite flake.

Energetic and magnetic directional aggregation properties of KPA@Fe3O4 composite particles prepared via a microcrystalline co-precipitation route

“…As an important battlefield weapon in the information warfare, electrically conducting materials or dusts, such as carbon fibers, copper aerosols, can cause the short circuit or paralysis to the electromagnetic equipment [4][5][6][7][8]. However, they are typically appropriate in exposed electromagnetic targets but are difficult to interfere the equipment with excellent sealing or protection.…”