Nanomaterials (Basel, Switzerland)

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2079-4991712017Jan13Nanomaterials (Basel, Switzerland)Nanomaterials (Basel)Modification of the Surface Topography and Composition of Ultrafine and Coarse Grained Titanium by Chemical Etching.1510.3390/nano7010015In this study, we present the detailed investigation of the influence of the etching medium (acidic or basic Piranha solutions) and the etching time on the morphology and surface relief of ultrafine grained (UFG) and coarse grained (CG) titanium. The surface relief and morphology have been studied by means of scanning electron microscopy (SEM), atomic force microscopy (AFM), and the spectral ellipsometry. The composition of the samples has been determined by X-ray fluorescence analysis (XRF) and X-ray Photoelectron Spectroscopy (XPS). Significant difference in the etching behavior of UFG and CG titanium has been found. UFG titanium exhibits higher etching activity independently of the etching medium. Formed structures possess higher homogeneity. The variation of the etching medium and time leads to micro-, nano-, or hierarchical micro/nanostructures on the surface. Significant difference has been found between surface composition for UFG titanium etched in basic and acidic Piranha solution. Based on the experimental data, the possible reasons and mechanisms are considered for the formation of nano- and microstructures. The prospects of etched UFG titanium as the material for implants are discussed.NazarovDenis VDVSaint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia. dennazar1@yandex.ru.ZemtsovaElena GEGSaint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia. ezimtsova@yandex.ru.SolokhinAlexandr YuAYSaint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia. solohin150194@mail.ru.ValievRuslan ZRZSaint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia. rzvaliev@gmail.com.SmirnovVladimir MVMSaint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia. vms11@yandex.ru.engJournal Article20170113

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