The phrase "acting as a medium" is correct and usable in written English.
It can be used in contexts where something or someone is serving as an intermediary or conduit for communication or interaction.
Example: "The artist is acting as a medium between the audience and the emotions conveyed through her work."
Alternatives: "serving as an intermediary" or "functioning as a conduit."
Hence, acting as a dispersive medium, the ionosphere has great influence on the satellite navigation and communication.
Yb3+, Er3+-doped yttrium oxyfluoride [YOF:(Yb3+, Er3+)], acting as a luminescence medium, is introduced into the TiO2 electrode.
As illustrated in Fig. 1, a cementitious specimen acting as a porous medium for ion migration is placed between two electrolyte solutions.
In a new design of printhead with ER fluid acting as a working medium, the actuating element and the ER fluid valve control the ink droplet ejection [Smart Mater. Struct. 9 (2000) 839–847].
The optical cavity consists of the semiconductor optical amplifier SOA operating around 1300 nm acting as a gain medium and connected by single mode fiber patch chords to a 90:10 fiber coupler and the cavity is ended from one side by a coated fiber and the other side by a cleaved fiber end adjusted very near to the sample under test.
In order to improve the luminescence of ZnO-based light-emitting diodes, an interlayer of any other suitable material acting as a buffer medium is highly required for the significant improvement of the internal structure because the interlayer provides a stable charge environment during hole and electron injections in the light emitting part of the diode.
One successful direction has been the emergence of electrolytes based on methanesulfonic acid, MSA which has good electrolytic conductivity and is capable of dissolving many metals as well as acting as a useful medium for dispersion of solids prior to electrophoretic coating.
He's basically Joe Rogan acting as a seance medium for Jacob Rees-Mogg.
The team investigate the phenomena, trying to determine if the stones of the building are acting as a recording medium for past events (the "stone tape" of the play's title).
Soil is an essential component of terrestrial ecosystems which fulfils numerous important functions, such as acting as a growing medium for plants, filtering and storing water, supporting biodiversity, nutrient cycling and acting as a foundation for built structures (Bullock and Gregory 1991).
