ORALS
SESSION: ManufacturingWedPM2-R1
Non-Ferrous Advanced Materials from Macro- to Nanoscale - III | Mamalis International Symposium on Advanced Manufacturing of Advanced Materials and Structures with Sustainable Industrial Applications |
| Wed Nov, 7 2018 / Room: Mar Azul (50/1st) | |
| Session Chairs: Vladimir Kirko; Session Monitor: TBA |
16:45: [ManufacturingWedPM211]
Chemical Transformation of Carbon Nanostructures and its Use in Nanocomposites Guram
Bokuchava
1 ; Tinatin
Kuchukhidze
1 ; Tamari
Archuadze
1 ; Ekaterine
Sanaia
1 ;
Natia
Jalagonia2 ;
1Ilia Vekua Sukhumi Institute of Physics and Technology, Tbilisi, Georgia;
2Ilia Vekua Sokhumi Institute of Physics and Technology, Tbilisi, Georgia;
Paper Id: 341
[Abstract] The discovery of graphene as an important material transformed nanotechnologies. The great interest in graphene is testified by lots of articles, which are published monthly in scientific literature. It seems though, that less attention is paid to chemical properties of carbon nanostructures. Carbon nanostructures have different functional groups that have the ability to react with various organic and inorganic compounds [1], which is why it is possible to modify carbon nanostructures by different compounds and then obtain organic and inorganic composites based on the aforementioned modified nanoparticles. For example, chemically active metalorganic compounds of I, II and III group metals can react to all functional groups which contains carbon nanostructures. For this purpose, graphene suspension in DMF (obtained modified Hummers' method) has been carried out thermally at 1700°C (for removal of adsorbed water) and then triisobutylaluminum solution in toluene was added. As a result, isobutene was excreted at ambient temperature, meaning that aluminum was connected to carbon nanostructure by oxygen bridges. We have gotten C<sub>8</sub>O<sub>2</sub>(OH)<sub>2</sub> as the estimated formula of graphene for quantitative calculation.
Modified graphene oxide suspension by alumoorganic compunds in DMF was mixed with alumina suspension in toluene, and then the homogenization process was carried out in a nanomill. The concentration of graphene oxide suspension is 1.5%w in composite. The obtained mixture was dried and then consolidated in high temperature vacuum furnace at 14500°C under pressure 478 kg/sm<sup>2</sup>. Microhardness is 15.88 GPa (loading - 200 g) of obtained ceramic materials. Microhardness is 12.025 GPa of ceramic materials obtained from pure alumina in same condition. Testing was carried out using the Oliver-Pharr method according to ISO-14577 standard. We are continuing works to determine the optimal concentration of modified graphene oxide and researching other physical-mechanical properties [2].
References:
[1] Lee, C. et al. Elastic and Frictional Properties of Graphene. Phys. Stat. Solidi. B 246, 2562-2567 (2009);
[2] Hyo Jin Kim, Sung-Min Lee1, Yoon-Suk Oh, Young-Hwan Yang, Young Soo Lim, Dae Ho Yoon,Changgu Lee, Jong-Young Kim, Rodney S. Ruoff. Unoxidized Graphene/Alumina Nanocomposite: Fracture- and Wear-Resistance Effects of Graphene on Alumina Matrix. DOI: 10.1038/srep05176;
