Preface to the Special Issue «Track-Etched Membranes: Future Prospects, Opportunities and Challenges»

Track-etched membranes (TeMs) represent a unique class of materials whose precise pore geometry and adaptable surface chemistry have made them indispensable in many areas of modern science and technology. Originally developed as filters for biological and analytical applications, they are now widely recognized as versatile functional platforms in separation processes, energy devices, sensors, and biomedical technologies. Their ability to combine reproducible nanoscale structure with tunable chemical modification explains the sustained interest in this field and provides the motivation for this Special Issue.