Underwater sound absorption properties of polydimethylsiloxane/carbon nanotube composites with steel plate backing

Fu, Yifeng; Fischer, Jeoffrey; Pan, Kaiqi; Yeoh, Guan Heng; Peng, Zhongxiao

doi:10.1016/j.apacoust.2020.107668

Cited by 37 publications

(21 citation statements)

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“…Nanocomposite of carboxyl functionalised multiwalled carbon nanotubes (MWCNT-COOH) is utilised as additives into polydimethylsiloxane (PDMS) with a dispersant to enhance the underwater acoustic properties. Sound absorption coefficient in the low-frequency range from 1.500 Hz to 7.000 Hz improved to 0.3 with the addition of MWCNT-COOH 22 . Even such recent publications on the underwater sound absorption studies on the complex composites structures may not necessarily yield into direct comparative evaluation with this current study.…”

Section: Scattering Measurements On Hydrophone # 5 At 30°mmentioning

confidence: 99%

Advanced Layered Composite Structures for Underwater Acoustic Applications

et al. 2021

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The detection of underwater objects is one of the most critical technologies, and there have been constant efforts for developing sophisticated sonar systems in naval warfare. Against such efforts, the countermeasure of hiding underwater vehicles, equipment and weapons is another technological challenge. One of the effective countermeasures against sonic detection for the submarines and other underwater objects, such as naval mines, is to employ composite/hybrid materials to prevent ease of detection. Geometrical forms, shapes and layers, along with the tuning of the acoustical impedance, lead to a considerable decrease of the sonar signals via absorption of the sonic waves. In this study, an original and novel design of multi-layered composite/hybrid structure was developed and underwater acoustic testing procedures of reflection, transmission and scattering were applied in 80 kHz100 kHz frequency range. The findings obtained in this study showed that the multi-layered composite/hybrid materials with porous structure possess much lower values in millivolt than steel plates and might be potential candidates as covering and/or casing materials for underwater mines to reduce the acoustical signature against detection and identification.

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Section: Scattering Measurements On Hydrophone # 5 At 30°mmentioning

confidence: 99%

Advanced Layered Composite Structures for Underwater Acoustic Applications

et al. 2021

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“…With the increase of hydrostatic pressure, the performance of underwater sound absorption nanocomposites decreases or can be completely suppressed in some cases. [40,41] The reasons for this include the deformation of both matrix material and microbubbles, and the change of mechanical property under high compression. More specifically, the elastic modulus of polymer is increased under high compression, which impairs the acoustic absorbing ability in most cases.…”

Section: Mechanism Of Maintaining Underwater Sound Absorption At High Pressurementioning

confidence: 99%

“…Under high hydrostatic pressure, these voids are compressed, which has been analyzed in our previous study as shown in Figure 5(a). [41] With the protection of GNPs, the compression strength of the matrix material will be improved, so the deformation can be limited. Further, a large proportion of air voids interconnect with GNPs as shown in the SEM images.…”

Section: Mechanism Of Maintaining Underwater Sound Absorption At High Pressurementioning

confidence: 99%

Synergism of Carbon Nanotubes and Graphene Nanoplates in Improving Underwater Sound Absorption Stability under High Pressure

2022

ChemistrySelect

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Underwater sound absorption materials with broadband and resistance to high pressure are crucial for noise control in the ocean. Herein a new method is presented to synergistically improve material's resistance to high pressure with broadband by hybridizing carbon nanotubes (CNTs) with graphene nanoplatelets (GNPs) in polydimethylsiloxane (PDMS) matrix. The micro-structure shows the geometrical synergy between the nanoplatelets (GNPs) and nanotubes (MWCNT-COOH). Besides, GNPs also form junctions with air micro-voids. The underwater acoustic tests reveal that, compared with equivalent nanocomposites containing only CNTs or GNPs, the hybridized materials show significantly better sound absorption performance with a high hydrostatic pressure increased from 0.4 MPa to 1.0 MPa at the frequency range of 1500 Hz to 7000 Hz. Therefore, the hybridization of one-dimensional (1D) and twodimensional (2D) nano-carbon materials provides a new route for increasing the underwater sound absorption performance at high hydrostatic pressure.

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“…Meanwhile, micro-voids in elastomers have received an attention as acoustic-wave absorbing materials in an underwater environment. 60,61 With the potential development of a method to fabricate periodic pores, our porous PDMS can be utilized for sound-absorbing materials. Another possible application of closed-cell PDMS could be impact energy absorbing materials with an addition of specic microspheres.…”

Section: Mechanical Optical and Thermal Properties Of Porous Pdmsmentioning

confidence: 99%