Fluorescent Polyurethane Nanofabrics: A Source of Singlet Oxygen and Oxygen Sensing

Abstract

Polyurethane (PUR) nanofabrics based on nanofibers of average diameters in the range of 250-110 nm with different meso-tetraphenylporphyrin (TPP) loading (0.01-5 wt %) were prepared by an electrospinning process. The oxygen quenching of excited states and singlet oxygen-sensitized delayed fluorescence (SODF) of TPP were studied at different oxygen pressures. We found that TPP in PUR matrix is present in monomeric state, and it is easily accessed by oxygen. Analysis of the kinetics of the TPP triplet, singlet oxygen, and SODF indicates that repopulation of TPP fluorescent state includes reaction of singlet oxygen with TPP triplets. The integrated SODF achieved more than 20% of the prompt fluorescence for nanofabric loaded with 5 wt % TPP. The dependence of SODF intensity on the TPP concentration in nanofibers is nearly quadratic.

Antibacterial nanofiber materials activated by light

“…. 26 The results confirmed the phosphorescence measurements. The SODF technique is easy to use, has a lower signal-to-noise ratio than phosphorescence at 1270 nm and was suggested for sensitive testing of the photoactivity of the nanofiber materials.…”

Multi-Functional Magnetic Photoluminescent Photocatalytic Polystyrene-Based Micro- and Nano-Fibers Obtained by Electrospinning

“…Reports are available on E-spun multifunctional polymer nanofibers containing visible light responsive dyes, like porphyrin or phthalocyanine, which can produce electronically excited molecular oxygen (singlet oxygen, 1 ∆ g ) upon illumination with visible light and reveal an antibacterial effect [18][19][20]. Such multifunctional nanofibrillar composites have been found to be suitable for the fabrication of filters for water disinfection and the preparation of wound dressing patches to combat microbial infections.…”

Synthesis of substituted meso-tetraphenylporphyrins in mixed solvent systems

“…The data of elemental analysis were obtained with an EURO EA3000 elemental analyzer. 2 Propionic acid (47 mL) and valeric acid (37 mL) were added into a 250 mL three-neck roundbottom flask equipped with stirrer, reflux exchanger and dropping funnel. The mixture was stirred at refluxing temperature for 30 min.…”

“…Introduction meso-Tetraphenylporphyrin (TPPH 2 ) as one of the simple and stable substituted tetrapyrrolic macrocycle compounds has been widely investigated in terms of synthesis and application [1][2][3][4][5][6] for several decades. Many porphyrin derivatives including free base porphyrin compounds with different substituents, 7 mononuclear metalloporphyrins 8 and binuclear metalloporphyrins 9 have been prepared by virtue of the efficient synthesis of TPPH 2 with high yields.…”