Elaboration and characterization of nanoporous SU-8 template using PMMA as porogen

Vu, Duc Tu; Pham, Thi Nhung; Hsu, Chia-Chen; Benisty, Henri; Lai, Ngoc Diep

doi:10.1007/s10934-021-01036-w

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…Prospective candidates for such filters are porous membranes made of polymers atypical for the medical field (e.g., epoxy resins or photoresists), which can be easily formed using mastered techniques, e.g., the Dr. Blade method [ 4 ] or a spin-coating [ 5 ], for producing films of well-defined thickness followed by lifting the coating up from the substrate. A porosification of the polymer film in this case can be derived by traditional UV lithography [ 6 ], interference lithography [ 7 ], or removal of a sacrificial component from the polymer-based blend [ 8 ], to name a few.…”

Section: Introductionmentioning

confidence: 99%

Polymer Membrane Modified with Photocatalytic and Plasmonic Nanoparticles for Self-Cleaning Filters

et al. 2023

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In this study, we developed a filtering material for facial masks, which is capable of trapping and subsequent inactivation of bacteria under white light emitting diodes (LED) or sunlight irradiation. Such a functionality is achieved via the modification of the composite membrane based on porous polymer with photocatalytic (TiO2) and plasmonic (Ag) nanoparticles. The porous polymer is produced by means of a computer numerical control machine, which rolls a photoresist/thermoplastic mixture into a ~20-µm-thick membrane followed by its thermal/ultraviolet (UV) hardening and porosification. TiO2 nanoparticles are prepared by hydrothermal and sol-gel techniques. Colloidal synthesis is utilized to fabricate Ag nanoparticles. The TiO2 photocatalytic activity under UV excitation as well as a photothermal effect generated by plasmonic Ag nanoparticles subjected to LED irradiation are studied by the assessment of methylene blue (MB) decomposition. We demonstrate that, in contrast to the filter of the standard facial medical mask, the polymer membrane modified with spray-coated TiO2 and Ag nanoparticles prevents the penetration of bacillus subtilis from its top to bottom side and significantly inhibits bacterial growth when exposed to LED or sunlight.

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