The cover describes the development of nanofibers with encapsulated growth factors has been emerged as a promising approach in neo-tissues applications. The proposed nanofibrous systems provide a novel approach to both simulate the extra-cellular matrix for cell adhesion and also for localized delivery of signaling molecules and growth factors. Growth factors could be loaded into nanofibers using different techniques including physical adsorption, covalent bonding or encapsulation.
Composites of AISI 316L stainless steel and nanocrystalline Ti-B-C ceramic powders
Slawomir M. Kaczmarek1*, Tomasz Bodziony1, Vinh H. Tran2, Pawal Figiel3, Anna Biedunkiewicz3, Grzegorz Leniec1
1Institute of Physics, West Pomeranian University of Technology, Al. Piastów 17, 70-310 Szczecin, Poland
2Institute of Low Temperatures and Structural Research, 2 Okólna str., 50-422 Wroclaw, Poland
3Institute of Materials Science and Engineering, West Pomeranian University of Technology, Al. Piastów 17,70-310 Szczecin, Poland
Adv. Mater. Lett., 2018, 9 (10), pp 696-702
Publication Date (Web): Jul 18, 2018
Copyright © 2019 VBRI Press
Series of nanocrystalline and TiC, TiB2, and B4C powders as dopants (3%-20%) embedded in an AISI 316L austenitic steel have been prepared and investigated by ferromagnetic resonance and magnetic measurements. The homogeneous composites with the dopants up to x = 7 vol. % exhibit superparamagnetic properties, characterized by bifurcation between the field-cooled MFC(T) and zero-field cooled MZFC(T) magnetization below Tir and a maximum at Tmax in low-field MZFC(T) curves. We found that the Tir and Tmax values depend proportionally on the dopant concentrations x. The magnetization measurements in fields above 1000 Oe suggested an induced phase transition from superparamagnetic state to ferromagnetic one but presumably without long-range magnetic correlation. An analysis of magnetic anisotropic energy barrier distributions implied that different sizes and compositional types of dopants may contribute to the superparamagnetic relaxation process. The results demonstrate the possibility of obtaining new steel-based materials with desired properties and potential applications as combining magnetic and mechanical advantages.
Nanocrystalline, Ti-B-C, FMR, magnetic susceptibility.