Carbon-steel: applications of carbon nanomaterials to improve the structural and mechanical properties of the steels and cements that contain them.
The theme of the presentation aims to show how it is possible to interface the nanoscopic world (10-9 m) with the macroscopic one. In particular, it is possible to exploit the properties of some nano dimensional materials to improve the structural, mechanical and durability properties of some specific materials. We will illustrate an example of nanostructured material made of only Carbon (carbon nanotubes, CNT) and how CNT films deposited under proper conditions on steel surfaces can confer the composite material (steel + CNT) a significant improvement of the structural properties, mechanical and durability. For example, the oxidation and corrosion processes of the steels inside the reinforced cements limit their strength and durability. We will illustrate a method to insert CNT films directly during the industrial process. The process is low cost and consists of heat treatment, at about 650-700 ° C, of the steels which at the time of extrusion are exposed (before their final cooling) to methane or acetylene gas flows so as to form on their surface a homogeneous layer (film) of carbonaceous products, in the form of nanotubes and carbon fibers. CNT films adhere to steel permanently and preserve it from external agents almost completely due to their graphitic character. We have verified that the carbonaceous structures are hydrophobic and protect the steel from the corrosive action of external agents such as water (including saline water) and increase its tensile strength. As the fibers cover also at the grain edges of the steel, these prevent the movement of the dislocations (the first cause of the plasticity of the material) and increase its hardness and its Young coefficient by an order of magnitude. Finally, the interactions between the carbon structures and the surrounding cement should give greater elasticity and hardness to the entire composite structure in which contains steel, because nano carbon structures behave like a filamentous glue that holds cement and steel together
Sunday 20 October
From 12.30 pm to 1.30 pm
8.STAGE8A pav. 8
Manuela Scarselli: is a researcher in Physics of Matter at the Physics Department of the University of Rome "Tor Vergata". Her experimental activity concerns the synthesis and characterization of nanomaterials. She is an expert in tunneling microscopy (STM) and atomic force (AFM) and X-ray spectroscopy (XPS). The research activity of the last 10 years, concerns the synthesis, by vapor phase deposition (CVD), characterization and decoration of carbon nanotubes and their application in 1) photo-electrochemistry, 2) growth on steels. She also deals with the synthesis and characterization of innovative 2D materials (graphene and silicene). She is author or co-author of over 100 scientific publications in international journals and international conference proceedings on physics of matter
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