Naslov
Cellulose aerogels and their acoustic properties

Autori
Bafti, Arijeta ; Vapaavuori, Jana ; Lokki, Tapio ; Radovanović-Perić, Floren ; Mandić, Vilko

Kolaboracija
STSM COST Action

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
BOOK OF ABSTRACTS / Rogošić, Marko - Zagreb, 2023, 53-53

Skup
28HSKIKI

Mjesto i datum
Rovinj, Hrvatska, 28.03.2023. - 31.03.2023

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
cellulose ; aerogels ; sound dampening

Sažetak
The insulation of buildings and transportation systems has emphasized the necessity to develop advanced materials taking concern to the comfort of modern society ; to noise reduction. A special class of advanced porous materials, i.e. aerogels, can be prepared from inorganic matter, synthetic or natural polymers, as well as inorganic/organic composites and hybrids. Among a variety of different porous materials, aerogels attract much attention due to their excellent properties such as high porosity (>90%), high specific surface area, a variety of macro- and mesopores, etc. The mechanisms of sound absorption are partly different from those of conventional porous absorbers with large macropores (different foams and fibrous materials). The understanding of the acoustic properties of aerogels is far from complete, and experimental results remain dispersed. The list of properties of aerogel materials could be extended to include non-toxic, biocompatible, renewable, and widely available materials. Most importantly, aerogels offer the possibility of functionalization of hydroxyl groups on the polymer backbone [1–3]. In this work, we prepared monolithic cellulose aerogels by the sol-gel procedure followed by their thorough characterization in terms of density, specific surface area and morphology. Samples are shaped to fit an impedance tube (29 mm diameter) to be tested as sound absorbers. Frequency sweeps were performed, and data were recorded from 500 to 6000 Hz. Cellulose concentrations were varied from 4 wt% microcrystalline cellulose (MCC) to 7 wt% MCC, and additionally samples were mixed with sodium sulphate during the preparation procedure to impact pore size, which consequently affects the sound insulation properties, see Figure 1.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti, Kemijsko inženjerstvo, Temeljne tehničke znanosti, Interdisciplinarne tehničke znanosti

POVEZANOST RADA