Thermal Characterization of Sepiolite Samples

In this research, two sepiolite samples of different origins were studied by X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimeter, and thermogravimetry. It was observed that both sepiolite samples are nearly pure and well crystallized sepiolite. Thermal studies (thermogravimetry) showed that four distinct weight loss regions are observed in both sepiolite samples studied. It was noticed that these structural changes play an important role to the properties and uses of the sepiolite samples studied. Kinetic parameters of the sepiolite samples were determined by the Arrhenius method at three different heating rates and it was observed that activation energies of the raw and treated sepiolite samples were in the range of 112208 kJ mol-1.


Pulse phase resolved x-ray spectroscopy of four accretion powered millisecond pulsars
Çolak, Sıdıka Merve; Baykal, Altan; Department of Physics (2014)
In this thesis, pulse phase resolved X-ray spectroscopy of four accretion powered millisecond pulsars which are IGR J00291+5934 , IGR J17498-2921 , XTE J0929-314 and XTE J1807-294 will be presented. Phase dependent changes during their outbursts will be checked for possible correlations of spectral parameters such as photon index and blackbody temperature with rotation phase using archive of Rossi X-ray Timing Explorer (RXTE) observations. In the analysis of IGR J17498-2921 in 2011 outburst , positive corre...
The Chemistry, Kinetics, and Potential Utilization of Different Origins of Bentonite Samples
Kök, Mustafa Verşan (2014-01-17)
In this research, different origins of bentonite samples (non-treated, treated, and test) were studied by x-ray diffraction, Fourier transform spectrophotometer, viscometer, and thermogravimetry. It was observed that the major clay minerals were smectite and montmorillonite. Different band intervals were studied by Fourier transform. The weight loss regions related to the dehydration and de-hydroxylation process were determined by thermogravimetry. Kinetic parameters of the bentonite samples were determined...
Thermal characterization of crude oils in the presence of limestone matrix by TGA-DTG-FTIR
Kök, Mustafa Verşan; Nurgaliev, Danis K. (2017-06-01)
In present work oxidation of two heavy oils in limestone matrix was studied using simultaneous thermo-gravimetry (TGA), derivative thermogravimetry (DTG) and FTIR-spectroscopy techniques in the temperature range from 25 to 900 degrees C. Before the measurements, the composition and properties of crude oils and limestone were evaluated. Obtained TG and DTG curves shows four different reaction regions: low temperature oxidation (LTO), fuel deposition (FD), high temperature oxidation (HTO) and decomposition of...
Thermal behavior and kinetics of crude oils at low heating rates by differential scanning calorimeter
Kök, Mustafa Verşan (2012-04-01)
The objective of this research was to investigate thermal behavior and kinetics of different origin crude oils in limestone matrix by differential scanning calorimeter (DSC) at low heating rates. In DSC experiments, three distinct reaction regions were identified in all of the crude oil + limestone mixtures known as low temperature oxidation (LTO), fuel deposition (FD) and high temperature oxidation (HTO) respectively. Kinetic analysis of the crude oil samples was determined by different models known as AST...
Surface-enhanced Raman scattering spectroscopy via gold nanostars
Nalbant Esentürk, Emren (Wiley, 2009-01-01)
Anisotropic metallic nanoparticles (NPs) have unique optical properties, which lend them to applications such as surface-enhanced Raman scattering (SERS) spectroscopy. Star-shaped gold (Au) NPs were prepared in aqueous solutions by the seed-mediated growth method and tested for Raman enhancement using 2-mercaptopyridine (2-MPy) and crystal violet (CV) probing molecules. For both molecules, the SERS activity of the nanostars was notably stronger than that of the spherical Au NPs of similar size. The Raman en...
Citation Formats
M. V. Kök, “Thermal Characterization of Sepiolite Samples,” ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS, pp. 173–183, 2013, Accessed: 00, 2020. [Online]. Available: