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Ultralight graphene oxide/polyvinyl alcohol aerogel for broadband and tuneable acoustic properties.

ABSTRACT: An ultralight graphene oxide (GO)/polyvinyl alcohol (PVA) aerogel (GPA) is proposed as a new class of acoustic materials with tuneable and broadband sound absorption and sound transmission losses. The interaction between GO sheets and PVA molecules is exploited in our environmentally friendly manufacturing process to fabricate aerogels with hierarchical and tuneable porosity embedded in a honeycomb scaffold. The aerogels possess an enhanced ability to dissipate sound energy, with an extremely low density of 2.10 kg m^-3, one of the lowest values ever reported for acoustic materials. We have first experimentally evaluated and optimised the effects of composition and thickness on the acoustic properties, namely sound absorption and sound transmission losses. Subsequently, we have employed a semi-analytical approach to evaluate the effect of different processing times on acoustic properties and assessed the relationships between the acoustic and non-acoustic properties of the materials. Over the 400-2500 Hz range, the reported average sound absorption coefficients are as high as 0.79, while the average sound transmission losses can reach 15.8 dB. We envisage that our subwavelength thin and light aerogel-based materials will possess other functional properties such as fire resistance and EMI shielding, and will prove to be novel acoustic materials for advanced engineering applications.

SUBMITTER: Rapisarda M

PROVIDER: S-EPMC8134629 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:Antibiotic resistance has become a major public health problem generated by their excessive and inappropriate use. This is worrisome because multiple microbial infections that could traditionally be treated without major complications are now considerably challenging to treat. In this regard, research in this field has been focused on searching for new molecules capable of arresting these microbial infections with high effectiveness, including antimicrobial peptides (AMP) and various nanomaterials. Here, we proposed a novel topical hydrogel treatment based on a polymeric network of gelatin-polyvinyl alcohol-hyaluronic acid encapsulating a graphene oxide (GO) nanoconjugate on which silver nanoparticles (Ag NPs) have been grown. This treatment is intended to be stable, biocompatible, non-toxic, pleasant to skin contact, provide bioavailability of the active agent for a prolonged period in the affected skin area where its application is required and inhibit microbial growth effectively. The nanocomposite hydrogels were characterized in terms of microstructure, thermal resistance, rheological behavior, particle size distribution, texture profile and physical stability, as well as a one-month accelerated stability study. The satisfactory results in terms of physical chemistry, stability on storage modulus (G'), TSI values, and microstructure allowed choosing some points of the experimental design to encapsulate the GO-Ag NPs nanoconjugates. The biological evaluation of these nanocomposites showed that the treatments are biocompatible as they have a very low hemolytic effect (less than 5%) and a moderate platelet aggregating capacity (35%-45%). Finally, 100% of bacterial growth was inhibited by the action of the topical nanocomposite hydrogel treatments. These results led to affirm that these treatments can have an excellent performance in this application as well as in wound healing and dressing, bioadhesives, tissue engineering, and other biomedical applications.

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Ultralight graphene oxide/polyvinyl alcohol aerogel for broadband and tuneable acoustic properties.

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