Linear relationship between lateral size of reduced graphene oxide (RGO) and water vapor barrier property in RGO/PEI composite membrane

Zeng, Qing; Yin, Chongshan; Li, Xi; He, Chunqing

doi:10.1016/j.memsci.2023.121876

Cited by 3 publications

(1 citation statement)

References 64 publications

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“…The longer the distance travelled by the diffusing molecule across the film's thickness, the more tortuous the pathway. Zeng et al found that the lateral size of the nanoplatelet influences the permeability of the film, and a high lateral size of nanofiller results in a low transmission rate [56].…”

Section: Id η (T = 3 Days) η (T = 41 Days)mentioning

confidence: 99%

Graphite Nanoplatelets Nanostructured Films as Multifunctional Protective Layer in Kevlar/Nomex Sandwich Composites

Cilento,

Palmieri,

Giusto

et al. 2023

Applied Sciences

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In the aerospace sector, structural and non-structural composite components are usually subjected to a wide range of environmental conditions. Among all, moisture can seriously damage these materials’ performance, reducing their mechanical, thermal, electrical, and physical properties as well as their service time. Lightweight protective barrier coatings capable of reducing the diffusion of gases and/or liquids in a material can improve the material’s resistance in humid environments. In this work, nanolamellar nanocomposites characterized by a high in-plane orientation of nanoplatelets have been employed as protective coatings for Kevlar sandwich panels, reproducing the construction of a nacelle engine. The effectiveness of the protection against water uptake of nanocomposites reinforced with graphite nanoplatelets (GNPs) at high filler contents (70, 80 and 90 wt%) has been investigated using moisture uptake and Ground-Air-Ground (GAG) tests in an environmental chamber. GNP coatings effectively work as barrier by generating highly tortuous paths for molecule diffusion. Results showed a dependence of the absorption on the coating composition and inner structure. Films @70 wt% GNPs showed the best protection against moisture uptake by delaying the phenomenon and reducing the absorption by −80% after 3 days and −35% after 41 days.

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Section: Id η (T = 3 Days) η (T = 41 Days)mentioning

confidence: 99%

Graphite Nanoplatelets Nanostructured Films as Multifunctional Protective Layer in Kevlar/Nomex Sandwich Composites

Cilento,

Palmieri,

Giusto

et al. 2023

Applied Sciences

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Multilayer films of graphene oxide and polymeric microgels: reusable adsorbents

Zhu

et al. 2023

Aust. J. Chem.

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Graphene oxide (GO) has arisen as an effective adsorbent for water treatment owing to its high removal efficiency for water pollutants. However, separating GO adsorbents from the pollutant solution is difficult after adsorption. The GO adsorbents are unsuitable for various dyes, and can only remove cationic dyes from an aqueous solution. To address these issues, this study utilized a simple and cost-effective layer-by-layer assembly technique to deposit multilayer films onto solid substrates. These films were composed of poly(allylamine hydrochloride)–dextran (PAHD) microgels and GO, and were designed to be highly effective while remaining affordable. The PAHD/GO multilayer films obtained produced an effortless separation process and demonstrated exceptional adsorption capabilities for cationic, anionic and non-ionic dyes. Specifically, the adsorption capacities for carmine and mulberry red were notably high, measuring 337.4 and 417.7 mg g−1, respectively. In addition, the PAHD/GO multilayer films could be regenerated well in sodium chloride solution without obvious compromise of removal efficiency. The adsorption kinetics, isotherms and thermodynamics of dyes on the PAHD/GO multilayer films were also studied. Thanks to the straightforward manufacturing process and outstanding adsorption capabilities of PAHD/GO multilayer films, this study presents a significant opportunity to advance the practical application of GO in water treatment.

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Graphite Nanoplatelets Films as Multifunctional Protective Layer in Kevlar/Nomex Sandwich Composites

Cilento,

Palmieri,

Giusto

et al. 2023

Preprint

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In the aerospace sector, structural and non-structural components are usually subjected to a wide range of environmental conditions. Although lightweight, the use of composite parts for these applications is restricted, due to their poor performance in severe environmental conditions. Specifically, moisture can seriously damage the materials' performance, reducing their mechan-ical, thermal, electrical, and physical properties as well as the service time. A strategy to improve the materials’ resistance in humid environments is the use of protective lightweight barrier coatings to reduce the diffusion of gases and/or liquids in composites. Nanolamellar nanocom-posite characterized by the high in-plane orientation of nanoplatelets effectively works as barrier structures by generating tortuous paths for molecule diffusion. In this work, the effectiveness of protection against water uptake of nanocomposites reinforced with Graphite NanoPlatelets (GNPs) at high filler content (70, 80 and 90%wt) for Kevlar sandwich panels of a nacelle engine of an ATR42 aircraft has been investigated. Moisture uptake and Ground Air Ground (GAG) tests were carried out in an environmental chamber to reproduce temperature and relative humidity profiles representative of a real-scale application for a regional aircraft composite part. The high filler content of the graphene films ensures a high level of tortuosity by delaying and reducing moisture absorption by –71% compared to the unprotected panel, showing good barrier properties.

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Linear relationship between lateral size of reduced graphene oxide (RGO) and water vapor barrier property in RGO/PEI composite membrane

Cited by 3 publications

References 64 publications

Graphite Nanoplatelets Nanostructured Films as Multifunctional Protective Layer in Kevlar/Nomex Sandwich Composites

Graphite Nanoplatelets Nanostructured Films as Multifunctional Protective Layer in Kevlar/Nomex Sandwich Composites

Multilayer films of graphene oxide and polymeric microgels: reusable adsorbents

Graphite Nanoplatelets Films as Multifunctional Protective Layer in Kevlar/Nomex Sandwich Composites

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