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Pressure-induced densification and optical response of amorphous PDMS up to GPa
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DOI：10.1016/j.eml.2026.102485.png)
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Abstract
En 中文
The microscopic response of amorphous soft matter to extreme hydrostatic compression remains a fundamental challenge, hindering the deployment of soft materials in deep-sea and planetary interiors environments. Here, we elucidate the structural and optical response of polydimethylsiloxane (PDMS) up to the gigapascal (GPa) regime using in-situ high-pressure vibrational spectroscopy and Density Functional Theory calculations. We reveal a pressure-induced stiffening of the siloxane backbone and a densification mechanism that governs the macroscopic optical characteristics. Leveraging this intrinsic pressure-induced transmittance, we demonstrate a proof-of-concept, deep-sea optical pressure sensor operating at 100 MPa. Our findings establish the link between molecular-level compression and device-level functionality, validating the reliability of soft materials for functional design.
Keywords:
amorphous PDMS
high-pressure densification
optical response
vibrational spectroscopy
deep-sea sensor
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