Directionally Antagonistic Graphene Oxide-Polyurethane Hybrid Aerogel as a Sound Absorber

A novel Graphene oxide/Laponite RD/Chitosan ternary composite was synthesized by sol-gel method and freeze-drying method. The Laponite RD was silanized by 3-aminopropyltriethoxysilane (APTES). Graphene oxide (GO) was prepared by an improved Hummers method. Under the acidic conditions, self-assembly recombination was realized by electrostatic interaction between modified Laponite RD and GO. The results from Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscopy confirmed that the modified Laponite RD was successfully compounded with GO, and the composite is laminated and stacked. The results from BET (Brunauer–Emmett–Teller) methods found that the BET-specific surface area of the hybrid aerogel significantly increased with the increase of the doping content of the composite, and the specific surface area of the aerogel composite with 20% doping content reached 81 m2/g. The structure of aerogel is porous, and there are numerous holes in the interior, which is closely related to adsorption properties. Thermogravimetric analysis (TG) test was used to explore the change of thermal properties of hybrid aerogel materials, and it was found that the addition of composite increased the initial decomposition temperature and thermal stability of hybrid aerogel. Finally, the potential applications of aerogel were tested, such as methylene blue adsorption and CO2 adsorption.

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Wettability and sound absorption of graphene oxide doped polymer hydrogel

Scientific Reports ◽

10.1038/s41598-021-95641-z ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

A. Khosrozadeh ◽

R. Rasuli ◽

H. Hamzeloopak ◽

Y. Abedini

Keyword(s):

Graphene Oxide ◽

Surface Energy ◽

Sound Absorption ◽

Absorption Peak ◽

Polymer Hydrogel ◽

Sound Absorber ◽

Attenuation Value ◽

Doped Polymer ◽

Hydrogel Polymer

AbstractIn this paper, we introduce a nanocomposite as a humidity-sensitive sound absorber. The nanocomposites were prepared using hydrogel polymer (HP) as a matrix and graphene oxide (GO) as a filler. Results show that the surface energy of the nanocomposite is 58.4 mJ m−2, and GO sheets increase the nanocomposite porosity from 2.6716 cm2 g−1 (for HP) up to 3.246 cm2 g−1. In addition, the diameter of nanocomposite pores is 8.5202 nm lower than that of HP (10.274 nm). To study the effect of humidity on the sound absorption, we exposed them to moisture for 30 and 60 min and then measured sound absorption. Results show an absorption peak for the HP at 1022 Hz with an attenuation value of 30%, while the nanocomposite shows two main peaks around 1898 and 3300 Hz. In addition, results show that sound absorption peaks shift to higher frequencies according to humidification time.

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Graphene Oxide–Polymer Hydrogel: Wettability and Sound Absorption

10.21203/rs.3.rs-386971/v1 ◽

2021 ◽

Author(s):

A. Khosrozadeh ◽

R. Rasuli ◽

H. Hamzeloopak ◽

Y. Abedini

Keyword(s):

Graphene Oxide ◽

Surface Energy ◽

Sound Absorption ◽

Absorption Peak ◽

Polymer Hydrogel ◽

Sound Absorber ◽

Attenuation Value ◽

Hydrogel Polymer

Abstract In this paper, we introduce a nanocomposite as a humidity-sensitive sound absorber. The nanocomposites were prepared using hydrogel polymer (HP) as a matrix and graphene oxide (GO) as a filler. Results show that the surface energy of the nanocomposite is 58.4 mJm-2, and GO sheets increase the nanocomposite porosity from 2.6716 cm2 g-1 (for HP) up to 3.246 cm2 g-1. In addition, the diameter of nanocomposite pores is 8.5202 nm lower than that of HP (10.274 nm). To study the effect of humidity on the sound absorption, we exposed them to moisture for 30 and 60 min and then measured sound absorption. Results show an absorption peak for the HP at 1022 Hz with an attenuation value of 30%, while nanocomposite shows two main peaks around 1898 and 3300 Hz. In addition, results show that sound absorption peaks shift to higher frequency according to humidification time.

Download Full-text