Papers by Keyword: Fullerene

Abstract: In the presented work the features of formation of metal-fullerene films of the systems Al-C₆₀, Au-C₆₀, Cu-C₆₀, Ti-C₆₀ from atomic-molecular flows in vacuum were investigated, the processes of surface resonance plasmon absorption and diffusion were studied. It is shown that electron microscopy, optical, Auger-electron and X-ray spectroscopy methods are effective for the study of metal-fullerene films. The combination of different methods of spectroscopy and electron microscopy allowed to establish the dependence of the grain size of the films, the shift of the position of the plasmon absorption maximum, diffusion parameters on the ratio of metal and fullerene components, to establish the fact of formation of the chemical compound Cu₆C₆₀.

Abstract: The interaction of dopamine and Si-, Sn-, and BN-doped fullerenes was studied by using the density functional theory (DFT). Adsorption energies of dopamine–C60, dopamine–C59Si, dopamine–C58Sn, and dopamine–C58BN were -0.03 eV, -1.46 eV, -0.06 eV, and -0.05 eV, respectively. All systems had negative adsorption energies, indicating that dopamine can be adsorbed on fullerene. Furthermore, dopamine–C59Si had the smallest value and was chemisorbed shown by a created covalent bond between Si of fullerene and N of dopamine. Therefore, C59Si has a plausible potential as a drug carrier for dopamine molecules.

Abstract: In this research we investigated the contact angle of commercial SnAgCu solder paste mixing with some carbon allotropes such as graphite, graphene quantum dots, and fullerene of varying concentrations with melting temperature, wettability, interfacial microstructure. The wettability was assessed in terms of the contact angle. The in-line digital holography was used for determining the contact angle and morphological of samples at each temperature which the samples have been heating from room temperature until the melting temperature. In the experiment, only one beam was used as the object and reference beams which recorded by a CMOS camera. The recorded image was reconstructed by the angular spectrum digital holography numerical programing. Using the reconstructed images of our results, the shape and contact angle of solder pastes can be investigated.

Abstract: The presented study in the field of optical area is about receiving polymer new materials in the way of doping a small amount of fullerene С_60. Under the method of preparing samples it is revealed characteristics of an interaction between polymer components and doping materials. Significant absorption of ultraviolet radiation by studied samples at the certain concentration of the doping material is presented in the result of the optical study. It is shown that metal-fullerene nanostructures which are on the polymer surface call surface resonance of plasmon absorption.

Abstract: This study aims to optimize the production conditions for forming graphene directly on a quartz substrate, using a carbon 60 (C₆₀) thin film as a solid carbon source. In this experiment, we focused on the relationships between the thickness of the C₆₀ film and the nickel (Ni) catalyst film and the heat treatment conditions. As the thicknesses of the C₆₀ and Ni catalyst films increased, high-crystallinity multi-layered graphene was formed, however the optical transparency of the graphene film decreased. Scanning Electron Microscopy (SEM) observations and Raman scattering spectroscopy showed that after changing the atmosphere of the heat-treatment from an argon (Ar) gas to an Ar+ hydrogen (H₂) gas, the optical transparency of the graphene film was remarkably improved, due to the migration and vaporization of the Ni film, and due to etching of the multi-layered graphene.

Abstract: The structural changes of condensed fullerenes C₆₀ and C₂₈ at a temperature increase from 200 K to 2000 K have been studied by computational methods using the TERRA software for carbon-argon systems. The processes of destruction of fullerenes C₆₀ and C₂₈ molecules are presented, and the temperature ranges of their thermal stability are determined: up to 1000 K and up to 400 K, respectively. The following thermophysical parameters of the C₆₀-Ar and C₂₈-Ar systems are considered: specific volume, entropy, total enthalpy, total internal energy, equilibrium specific heat, molar mass of the gas phase, gas constant, and mass fraction of the condensed phase. A comparative analysis of their changes with increasing temperature is carried out. The results obtained in the course of thermodynamic modeling are similar to the results of a full-scale experiment conducted under similar conditions. In the future, the obtained data can be used to determine the explosive and fire-hazardous properties of fullerenes as a dispersed solid.

Abstract: The results of investigation of mechanical, electrical, thermoelectric and tribological properties of metal-fullerene film composites of Ni-C₆₀ and Ti-C₆₀ systems is presented. It has been found that doping of metals with fullerenes leads to a significant increase in the strength of the material, and a change in the electrical, optical, and other properties of the material. It is established that metal-fullerene films are characterized by low friction coefficients and high wear resistance. It is experimentally shown that metal-fullerene composite thin films possess a capacitive impedance, that the thermopower of Ti-C₆₀ coatings reaches the value of 30 μV/K depending on the Ti/C₆₀ ratio.

Abstract: Nanotechnology as a multidisciplinary and scientific innovation plays an important role in numerous biomedical applications, such as molecular imaging, biomarkers and biosensors and also drug delivery. A wide range of studies have been conducted on using of nanoparticles for early diagnosis and targeted drug therapy of various diseases. In fact, the small size, customized surface, upgraded solubility, or multi-functionality of nanoparticles enabled them to interact with complex cellular functions in new ways which opened many doors and created new biomedical applications. These studies demonstrated that nanotechnology vehicles can formulate biological products effectively, and this nano-formulated products with a potent ability against different diseases, were represented to have better biocompatibility, bioaccessibility and efficacy, under in vitro and in vivo conditions.

Abstract: In this paper we have considered two versions of elementary cells for creating a nanomembrane, which will be used to separate natural gas into different gas components. Calculated trajectories of helium atoms and methane molecules interacting with elementary structural units of the membrane are presented. The model is based on a discrete approach to describe the interaction of a structure with atoms and molecules.

Abstract: This report deals with a simple and efficient method to develop hybrid carbon nanoparticles (Nps) employing Multi-walled carbon nanotubes (MWCNTs) and Fullerene nps. Fullerene nps were self-assembled via Ultrasonicated Liquid-Liquid Precipitation. Surface treated MWCNTs were entangled with fullerene nps during the process of assembling of the fullerene nps. Fullerene nps are formed by reaction between two solutions, one is the saturated solution which contains dissolved fullerene and other solution is a rough alcohol. This reaction increases the concentration of carbon in the solution and leads to super saturate hence self-assembling into nanoparticles. The obtained hybrid nanoparticles sizes were in the range of 100 nm to 300 nm with entangled mwcnts and were confirmed by characterization using SEM, Raman, UV-Vis, XRD, and DLS.