For E2‑CDM to function reliably in real environmental settings, a major scientific breakthrough is needed in the development of electret materials that can maintain stable charge when exposed to water. Most commercial electrets are designed for air filtration and lose performance when submerged or repeatedly wetted. Creating a water‑compatible electret that preserves its electrostatic properties over long periods would dramatically improve microplastic capture efficiency and enable continuous sensing in rivers, lakes, and drinking‑water systems. This advancement is essential for transforming electret‑based microplastic detection from a laboratory concept into a durable, field‑ready technology.

For E2‑CDM to operate consistently outside the lab, a major breakthrough is needed in developing a compact, automated system that can reliably dry the electret after it captures microplastics. Even small amounts of residual moisture can distort dielectric readings, introduce noise, or temporarily neutralize the electret’s charge. Current drying methods rely on bulky lab ovens, desiccators, or manual handling, none of which can be integrated into a portable device. A low‑power, self‑contained drying mechanism that removes water quickly and evenly is essential for producing stable capacitance measurements in real environmental samples. Without this advancement, electret‑based sensing cannot achieve the accuracy or repeatability required for field deployment.

A critical breakthrough needed for E2‑CDM is the development of a simple and standardized method for preparing water samples before they reach the electret. Environmental water contains a mix of sediments, organic debris, biofilms, and dissolved salts that interfere with both microplastic capture and dielectric readings. Current filtration and separation techniques are slow, require laboratory equipment, and cannot be integrated into a compact device. To make E2‑CDM viable in real-world settings, a new sample‑handling system is required that can remove large debris, regulate ionic content, and deliver a clean, consistent flow of microplastics to the electret without altering the particles themselves. Without this breakthrough, capacitance signals would vary unpredictably from sample to sample, preventing accurate quantification and making field deployment unreliable.