Application of thermal analysis in nanotechnology

Abstract

The analysis of purification and carbonization process in argon with use of nc-TiC x /C powder, obtained by sol-gel method, is presented. TG-DSC measurements were carried out under non-isothermal and isothermal conditions. The samples were heated up in series to 1473, 1573, 1673, and 1773 K. For this series description of process kinetics is presented. Four stages of the process have been distinguished. Kinetics was described using Coats-Redfern equation. The kinetic parameters were determined for particular stages. Using obtained kinetic data, the analysis of the process was performed. The a(T) and r(a,T) dependencies on heating rate and temperature were investigated. In order to obtain high carbonization degree and carbide particles of small size, an appropriate temperature and time of process duration have to be determined. Appropriate carbonization and particles size were obtained for series heated up to 1570 K. It has been demonstrated that the oxygen, present at trace level in argon, can react with components of the system in certain range of temperature, influencing the quality of obtained product. The particles have been depicted by TEM method, whereas characterization of structure and particles size was performed by XRD method. MS method was used to determine evolved gaseous products.

Microstructure and Tribocorrosion Properties of Titanium Matrix Nanocomposites Manufactured by Selective Laser Sintering/Melting Method

“…As matrix materials commercially pure Ti powders from SLM Solutions GmbH, and as the hard, second-phase nc-TiC particles, in powder form were used. The nc-TiC powders were obtained by non-hydrolytic sol-gel methods [8]. The average size of TiC crystallites was 40 nm.…”

“…The method synthesis, structure and morphology of nc-TiC powder were presented earlier [8]. The size of crystallites, morphology phase and chemical composition of the composites were determined with the following techniques: X-Ray diffraction (XRD) using PANalytical PW3040/60 X'Pert Pro with Cu Kα radiation, scanning electron microscopy (SEM) using HITACHI SU apparatus equipped with THERMO FISHER NORAN 7 microanalysis adapter.…”

Cancer Nanopharmaceuticals: Physicochemical Characterization and In Vitro/In Vivo Applications

“…[ 65 ]. In combination with DSC or other techniques such as infrared spectroscopy, mass spectrometry, or gas chromatography-mass spectrometry a comprehensive evaluation of the thermal characteristic of nanomaterials is possible [ 66 ].…”

Non-isothermal Dehydration Kinetics of Titania Gel

“…The n=6 kinetic model was observed to be the best fitted for all the system during kinetic model determination by applying Coats-Refern method. Biedunkiewicz et al (2010) performed TG-DSC measurements under non-isothermal and isothermal conditions at four different temperatures and used Coats-Redfern method to describe the kinetic parameters. Maitra et al (2008) synthesized zeolite gel and showed that gel dehydration followed first order kinetics and it proceeded through low energy diffusion controlled process.…”