Superbroad-band actively tunable acoustic metamaterials driven from poly (ethylene terephthalate)/Carbon nanotube nanoco
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Superbroad-band actively tunable acoustic metamaterials driven from poly (ethylene terephthalate)/Carbon nanotube nanocomposite membranes Ying Li1,2, Wen Ning3, Qingyu Peng2,4, Minglong Yang2, Dongyi Lei1, Siyao Guo1, Peng Liu3 (), Kaili Jiang3, Xiaodong He2,4 (), and Yibin Li2,4 () 1
School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments, Harbin Institute of Technology, Harbin 150080, China 3 State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics & Tsinghua-Foxconn Nanotechnology Research Center, Tsinghua University & Collaborative Innovation Center of Quantum Matter, Beijing 100084, China 4 Shenzhen STRONG Advanced Materials Institute Ltd. Corp, Shenzhen 518000, China 2
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2020 Received: 23 June 2020 / Revised: 2 August 2020 / Accepted: 10 August 2020
ABSTRACT Actively tunable acoustic metamaterials have attracted ever increasing attention. However, their tunable frequency range is quite narrow (tens of Hz) even under ultrahigh applied voltage (about 1,000 V). Here, we report a superbroad-band actively tunable acoustic metamaterials with the bandwidth over 400 Hz under a low voltage. In the actively tunable acoustic metamaterials, the acoustic membrane is a laminated nanocomposite consisting of a poly (ethylene terephthalate) (PET) and super-aligned carbon nanotube (CNT) drawn from CNT forest array. The laminated nanocomposite membrane exhibits adjustable acoustic properties, whose modulus can be adjusted by applying external electric field. The maximum frequency bandwidth of PET/CNT nanocomposite membrane reaches 419 Hz when applying an external DC voltage of 60 V. Our actively tunable acoustic metamaterials with superbroad-band and lightweight show very promising foreground in noise reduction applications.
KEYWORDS poly (ethylene terephthalate)/carbon nanotube nanocomposite membrane, active control, acoustic metamaterials, noise reduction
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Introduction
Acoustic metamaterials are a new category of designable artificial acoustic structures with negative effective mass densities and bulk modulus, which usually rely on localized resonance mechanisms, achieving significantly subwavelength attenuation of sound wave in numerous areas [1–3]. Although membranetype acoustic metamaterials consisting of lightweight decorated membrane resonators have shown their huge potential in sound wave manipulation, it still remains a great challenge to achieve active regulating acoustic wave because they are hardly adjustable once fabricated [4–7]. In recent years, active acoustic metamaterials (AAMs) have attracted enormous attention due to their designable and controllable constitutive parameters against to sound wave. Till now, many works have been focused on the introduction of active designs, such as magnetic fields, electrical fields, mechanic interaction, piezoelectr
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