A transparent aqueous nanodispersion of magnesium hydroxide (MH) is first synthesized by using a rotating packed bed (RPB) reactor. Based on this nanodispersion, we further fabricate a transparent poly­(vinyl alcohol) (PVA)/MH nanocomposite with enhanced flame-retardant property by a solution-mixing method. The PVA/MH nanocomposite can keep good transparency even at high MH contents. The limiting oxygen index (LOI) of PVA/MH nanocomposite with 50 phr MH is improved by 45% compared to pure PVA. The peak of heat release rate (pHRR) in the microscale combustion calorimetry (MCC) significantly reduces from 453 W/g for pure PVA to 332 W/g. Importantly, a smooth and compact residue layer for the PVA/MH nanocomposite is formed during combustion, which yields a barrier for the transfer of heat and oxygen. These results indicate that the PVA/MH is an excellent transparent flame-retardant material, which opens a door to manufacture transparent and fire-resistant polymer-based nanocomposites with environmental-friendly process.

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Graphene-based nanocomposites exhibiting excellent properties have been attracting tremendous interest for their extensive applications. In this work, we present an in situ high-gravitational strategy to synthesize silver/graphene oxide (AGO) nanocomposite in an ultrafast manner and propose a possible mechanism for the formation of silver nanoparticles (Ag-NPs) on graphene oxide (GO) sheets with high coverage density. The size of Ag-NPs can be controlled at ∼5 nm with a narrow size distribution. Transparent conductive films are further fabricated with AGO nanocomposite. The visible transmittance of the Ag/reduced graphene oxide (rGO) film with a sheet resistance of 1.12 kΩ/□ can reach 91%. The graphene-based nanocomposites prepared rapidly by the high-gravity technology, which is easy to realize in large-scale production, may provide extensive applications in electronics, catalysis, optics fields, etc.

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