Savvas Orfanidis

• Material science and engineering diploma
• PhD Student at University of Ioannina-National Center for Scientific Research Demokritos-

We report the synthesis of controlled sized Urea-formaldehyde (UF) microcapsules containing an epoxy healing agent via in situ emulsification polymerization for the study of self-healing epoxy systems. Scanning Electron Microscopy (SEM) confirmed that the capsules possessed rough external surface which enhanced mechanical interlocking. Differential...

Adhesive bonding repair is potentially a cost effective for repairing off shore and underwater marine structures such as underwater pipelines. In such applications steel and Nickel alloys are the most widely used choices. The main use of Invar, a Nickel based alloy, is in cryogenic environments because of it is approximately zero thermalexpansion c...

The aim of this work is the study of the electrochemical and mechanical behaviour of stainless steel (SS304) adhesively bonded with carbon nanotube (CNT)-reinforced epoxies to either SS304 or carbon-reinforced composites substrates. For metal to metal (MtM) joints, the shear strength of nano-reinforced adhesives was studied using single lap shear s...

4th International Conference of Engineering Against Failure (ICEAF IV) 24-26 June 2015, Skiathos, Greece. Adhesive bonding repair is potentially a cost effective for repairing off shore and underwater marine structures such as underwater pipelines. Moreover, when composite materials are employed as bonded patches, the tailoring of the composite to...

In this work we present a novel approach utilizing nuclear magnetic resonance (NMR) relaxometry to assess the structural stability of microcapsules employed as self-healing agents in advanced aerospace composites both in ambient and harsh environmental conditions. We successfully correlate the amount of the encapsulated self-healing agent with the...

Molecular motion in nanosized channels can be highly complicated. For example, water molecules in ultranarrow hydrophobic nanopores move rapidly and coherently in a single file, whereas by increasing the pore size they organize into coaxial tubes, displaying stratified diffusion. Interestingly, an analogous complex motion is predicted in viscous ch...

Weyl fermions (WFs) in the type-II Weyl semimetal (WSM) WTe2 are difficult to resolve experimentally because the Weyl bands disperse in an extremely narrow region of the (E−k) space. Here, by using DFT-assisted high-resolution Te125 solid-state nuclear magnetic resonance (ssNMR) in the temperature range 50–700 K, we succeeded in detecting low energ...

Molecular motion in nanosized channels can be highly complicated. For example, water molecules in hydrophobic nanopores move rapidly and coherently in a chain, following the so-called single file motion. Surprisingly, fast molecular motion is also observed in viscous charged fluids, such as room temperature ionic liquids (RTILs) confined in a nanop...

Weyl semimetals (WSM) are a new quantum state of matter hosting the condensed matter physics analogue of the massless Weyl fermions (WF). Depending on whether they conserve or violate the Lorenz symmetry, WSMs are classified as either type-I and type-II; however, until now type-II WFs are only indirectly verified experimentally. Here, by employing...