COMPOSITE POLYMERIC MATERIALS BASED ON POLYCAPROLACTONE WITH ADDITION OF MODIFIED AMINOGRAPHENE FOR TISSUE ENGINEERING

In present work, we have been focused on the preparation of composite polymer materials representing films based on poly-ε-caprolactone (PCL) filled with aminographene modified with poly(glutamic acid) (PGlu). The further preparation of such composites as 3D-materails will allow their application as scaffolds for the bone tissue regeneration.The research was carried out using the equipment of the St. Petersburg State University Research Park: “Center for Chemical Analysis and Materials Research” and ”Interdisciplinary Center for Nanotechnology”

On the Stability of Pt‐Based Catalysts in HBr/Br2 Solution

Stability studies on supported metal nanoparticles are essential for gaining insight into the design and optimization of high-performance materials. In this work, the dissolutions of Pt-based catalysts in HBr/Br2 mixture of various concentration regimes were studied and correlated with material structural properties. The dissolution of metal nanoparticles was enhanced by adding Br2 to the HBr solution. Comparing with commercial Pt/C catalyst, the well-alloyed PtIr/C catalyst was observed to exhibit high resistance towards dissolution. In addition, regulating the accessibility of the metal sites to dissolution-inducing species contributed to the marked stability of the nanoparticles in HBr/Br2 solutions, as shown for the surface-modified PtIr/C catalysts with organic diamine molecules.ISSN:0018-019XISSN:1522-267