Modern evaluation methods thermal oxidative stability of reactive fuels in dynamic conditions and prospects for their development

The article discusses methods for assessing the thermal bonding stability (TOC) of jet fuels. The importance of determining this indicator for the design and operation of modern and advanced aircraft was noted. It is indicated that the methods used for assessing TOC are indirect, which limits their accuracy and reliability. The article gives the author's expert assessment of the correlation of the method indicators with the operational properties of fuels. Promising areas for the development of methods for measuring the amount of deposits include modern optical research methods: spectroscopic reflectometry, laser ellipsometry, as well as direct measurement of micro-amounts of deposits on control elements.

Synthesis and Surface Modification of Nanostructured F-Doped ZnO: Toward a Transducer for Label-Free Optical Biosensing

In this work, the surface of nanostructured fluorine-doped ZnO (nZnO·F) is functionalized with protein A (PrA), and used as a model biomolecule. The chemical procedure is characterized by several analytical techniques such as Fourier Transform Infrared Spectroscopy, water contact angle analysis, and fluorescence microscopy. The surface modification of nZnO·F by binding increasing concentrations of PrA is also investigated by two label-free optical techniques, i.e., the spectroscopic reflectometry and the steady-state photoluminescence. The results are compared with those obtained using undoped nZnO substrates in order to highlight the better performances of nZnO·F due to the fluorine doping. The results of this study pave the way for the design and realization of a ZnO-based nanostructured platform for label-free optical sensing.