Jin, Sang Woo Park, Jeongwon Hong, Soo Yeong Park, Heun Jeong, Yu Ra Park, Junhong Lee, Sang-Soo Ha, Jeong Sook 2024-01-20T06:33:13Z 2024-01-20T06:33:13Z 2021-09-05 2015-07-16 2045-2322 https://pubs.kist.re.kr/handle/201004/125224 Considering the various applications of wearable and bio-implantable devices, it is desirable to realize stretchable acoustic devices for body-attached applications such as sensing biological signals, hearing aids, and notification of information via sound. In this study, we demonstrate the facile fabrication of a Stretchable Acoustic Device (SAD) using liquid metal coil of Galinstan where the SAD is operated by the electromagnetic interaction between the liquid metal coil and a Neodymium (Nd) magnet. To fabricate a liquid metal coil, Galinstan was injected into a micro-patterned elastomer channel. This fabricated SAD was operated simultaneously as a loudspeaker and a microphone. Measurements of the frequency response confirmed that the SAD was mechanically stable under both 50% uniaxial and 30% biaxial strains. Furthermore, 2000 repetitive applications of a 50% uniaxial strain did not induce any noticeable degradation of the sound pressure. Both voice and the beeping sound of an alarm clock were successfully recorded and played back through our SAD while it was attached to the wrist under repeated deformation. These results demonstrate the high potential of the fabricated SAD using Galinstan voice coil in various research fields including stretchable, wearable, and bio-implantable acoustic devices. English NATURE PUBLISHING GROUP HUMAN HEARING DEVICES ELECTRONICS CONDUCTORS GRAPHENE TRANSPARENT THERAPY SENSOR NANOGENERATOR ACTUATOR Stretchable Loudspeaker using Liquid Metal Microchannel Article 10.1038/srep11695 1 SCIENTIFIC REPORTS, v.5 SCIENTIFIC REPORTS 5 scie scopus 000357976600001 2-s2.0-84937458401 Multidisciplinary Sciences Science & Technology - Other Topics Article HUMAN HEARING DEVICES ELECTRONICS CONDUCTORS GRAPHENE TRANSPARENT THERAPY SENSOR NANOGENERATOR ACTUATOR acoustics actuators electronic devices polymers