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The optical density ratio method could be used for relative oxygen saturation measurements, for example, for determining the variation of the SO 2 under various physiological conditions, before and after an intervention or for monitoring retinal diseases such as diabetic retinopathy.

This work reports on the implementation of electrospinning (ES) as a facile route to encapsulate nano-engineered materials in a polystyrene (PS) matrix. We applied ES to co-encapsulate two kinds of nanoparticles, i.e., upconversion nanophosphors (UCNPs) and superparamagnetic iron oxide nanoparticles (SPIONs), in polystyrene (PS)-based micro-and nano-fibers (PSFs). This approach made it possible to integrate near-infrared (NIR) light-sensitive 500-nm β-NaYF 4 :Yb, Er UCNPs with 10-nm γ-Fe 2 O 3 SPIONs in PS fibers. During the ES process, PSFs were additionally loaded with a well-established singlet oxygen ( 1 ∆ g ) photosensitizer, rose bengal (RB).The thus obtained PSFs revealed the promising features of prospective multi-functional magnetic photoluminescent photocatalytic nano-constructs. OPEN ACCESSFibers 2014, 2 76

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