Original title: Tailoring Mechanical and Acoustic Properties of Liquid-Filled Elastomers as Reusable Ultrasound Couplants
Surojit Ranoo, Romain Fayolle, Jean Baudry, Nicolas Bremond · September 2026
Ultrasound devices need couplants—substances placed between the scanner and the target—to transmit sound waves smoothly. Traditional gels transmit waves well, but they are single-use and messy. Existing solid rubber couplants are reusable, but they struggle to be soft enough to mold against surfaces while also passing sound through efficiently. To solve this, researchers developed a new reusable material. They created a silicone rubber base filled with tiny trapped droplets of liquid diols and triolsLiquids used to adjust the material's properties., using an emulsion method that packs in up to 75 volume fractionThe percentage of the material's volume that is liquid droplets. (%) of liquid. This design works because the trapped liquid lets scientists tune mechanical softness and sound transmission independently. They found that a version with 70 % glycerol matches the softness of human skin and the acoustic properties of soft tissues. It molds well to rough surfaces and functioned successfully inside a test ultrasound device.
Packing a fragile gift for shipping requires a cushion that molds to odd shapes while keeping the item safe. Too soft and it won't protect; too rigid and it won't fit the contours. In this paper, the material works like that cushion for ultrasound: it conforms to skin or surfaces while efficiently carrying sound waves.
Ultrasound devices in healthcare and industry rely on single-use gels, creating waste and limiting applications like wearable monitors. This material enables reusable coupling, making prolonged health monitoring and industrial inspections more practical.
The abstract does not cover long-term durability, cost, or performance under harsh conditions. It focuses on the material's design and initial functional test.
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Tailoring Mechanical and Acoustic Properties of Liquid-Filled Elastomers as Reusable Ultrasound Couplants — Surojit Ranoo, Romain Fayolle, Jean Baudry et al.
Abstract licence: CC0
Explanation generated by Synthesis from the abstract — it is not the original paper. This is a preprint, so it hasn't necessarily been peer reviewed.