Elastic properties of confined fluids from molecular modeling to ultrasonic experiments on porous solids

Fluids confined in nanopores are ubiquitous nature and technology. In recent years, the interest fluids has grown, driven by research on unconventional hydrocarbon resources—shale gas shale oil, much of which nanopores. When nanopores, many their properties differ from those same fluid bulk. These include density, freezing point, transport coefficients, thermal expansion coefficient, elastic properties. The moduli a pores contribute to overall elasticity fluid-saturated porous medium determine speed at waves traverse through medium. Wave propagation media is pivotal for geophysics, as used characterization formations rock samples. this paper, we present comprehensive review experimental works wave nanoporous media, well theoretical focused calculation compressibility confinement. We discuss models that bridge gap between experiments theory, revealing number open questions both fundamental applied nature. While some results were demonstrated experimentally theoretically (e.g., pressure dependence fluids), others predicted, but not verified linear scaling modulus with pore size). Therefore, there demand combined experimental-modeling studies samples various characteristic sizes. extension molecular simulation simple model more complex another area practical interest.