Trencin University Of bcek

Púchov, Slovakia

Trencin University Of bcek

Púchov, Slovakia
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Anbusrinivasan P.,AVC College | Madhurambal G.,ADM College | Mojumdar S.C.,University of Guelph | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2012

Anthracene crystals were grown by solution growth technique by adopting slow evaporation method from the solvents CS2, CCl4 and CHCl3. The induction period was measured at various super saturations, and hence the interfacial energies were evaluated. Using the interfacial tension value, the nucleation parameters such as radius of the critical nuclei (r*), the Gibbs free energy change for the formation of a critical nucleus (ΔG*) and the number of molecules in the critical nucleus (i*) were also calculated for all these solvents at two different temperatures. The effect of surface tension, viscosity and density of these solvents are correlated with interfacial tension. The solution grown crystals were subjected to UV, FTIR, NMR and X-ray diffraction studies. The purity and high-thermal stability of the grown crystals were determined using thermal analysis. © 2012 Akadémiai Kiadó, Budapest, Hungary.


Madhurambal G.,Admcollege For Women | Mariappan M.,Rajahs College | Hariharan S.,Government College for Men | Ramasamy P.,SSN College of Engineering | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2013

Mixed crystals of 0.1 and 0.25 zinc magnesium ammonium sulphate were grown by slow evaporation of aqueous solution at room temperature. The bright and transparent crystals obtained were characterized by thermal (TG-DTA), FTIR and XRD analyses. A fitting decomposition pattern for the compound was formulated on the TG curve which shows two stage mass losses between 133 and 478.75 C. In this temperature range, DTA curve shows exothermic peaks supporting the formulated decomposition pattern. The FTIR spectra show the vibration frequencies due to the formation of zinc magnesium ammonium sulphate mixed crystals. Detailed structural analysis of the compound is under progress. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Madhurambal G.,ADM College for Women | Mariappan M.,H H The Rajahs College | Hariharan S.,Government of Tamilnadu | Ramasamy P.,SSN College of Engineering | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2013

Mixed crystals of various proportions of zinc magnesium ammonium sulfate were grown by slow evaporation of aqueous solution at room temperature. The bright and transparent crystals obtained were characterized through thermal (TG-DTA) and FTIR spectral analyses. A fitting decomposition pattern for the compound was formulated on the TG curve which shows two stage mass losses between 133 and 478.75 C. DTA curve shows exothermic peaks in this temperature range supporting the formulated decomposition pattern. The FTIR spectra show the vibration frequencies due to the formation of zinc magnesium ammonium sulfate mixed crystals. Detailed structural analysis of the compound is under progress. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Gonsalves L.R.,Goa University | Mojumdar S.C.,University of Western Ontario | Mojumdar S.C.,University of New Brunswick | Mojumdar S.C.,Trencin University Of bcek | Verenkar V.M.S.,Goa University
Journal of Thermal Analysis and Calorimetry | Year: 2011

Cobalt zinc ferrite, Co 0.8Zn 0.2Fe 2O 4, nanoparticles have been synthesized via autocatalytic decomposition of the precursor, cobalt zinc ferrous fumarato hydrazinate. The X-ray powder diffraction of the 'as prepared' oxide confirms the formation of single phase nanocrystalline cobalt zinc ferrite nanoparticles. The thermal decomposition of the precursor has been studied by isothermal, thermogravimetric and differential thermal analysis. The precursor has also been characterized by FTIR, and chemical analysis and its chemical composition has been determined as Co 0.8Zn 0.2Fe 2(C 4H 2O 4) 3•6N 2H 4. The Curie temperature of the 'as-prepared oxide' was determined by AC susceptibility measurements. © 2011 Akadémiai Kiadó, Budapest, Hungary.


Gawas U.B.,Goa University | Verenkar V.M.S.,Goa University | Mojumdar S.C.,Trencin University Of bcek | Mojumdar S.C.,University of New Brunswick
Journal of Thermal Analysis and Calorimetry | Year: 2011

Ni 0.6Zn 0.4Fe 2O 4 nano-particles have been synthesized by self-propagating auto-combustion of nickel zinc ferrous fumarato-hydrazinate complex. The precursor complex has been characterized by chemical analysis, IR, AAS, thermal analysis and isothermal mass loss studies. The precursor on ignition undergoes self-propagating auto combustion to give Ni 0.6Zn 0.4Fe 2O 4. The X-ray diffraction studies confirmed the single phase formation of nano-size 'as synthesized' Ni 0.6Zn 0.4Fe 2O 4. TEM observation showed the average particle size to be 20 nm. Infrared and magnetization studies were also carried out on the 'as synthesized' Ni 0.6Zn 0.4Fe 2O 4. The lower value of saturation magnetization and higher Curie temperature of 'as synthesized' ferrite also hint at the nano size nature. © 2011 Akadémiai Kiadó, Budapest, Hungary.


Ramasamy G.,Annamalai University | Meenakshisundaram S.P.,Annamalai University | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2013

The effect of the s-, p-, d-, and f- block elements [Mg(II), Sb(III), Pd(II), and La(III)] doping on the optical and thermal properties of potassium dihydrogen phosphate (KDP) crystals has been described. Energy dispersive X-ray spectra reveal the incorporation of metal ion [Mg(II), Sb(III), Pd(II), and La(III)] into the crystalline matrix of KDP. UV-Visible study shows that the transparency is not affected much by doping, and the diffuse reflectance data were employed to estimate the band gap energy. The differential scanning calorimetry curves reveal the purity of the sample, and no decomposition is observed up to the melting point. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Lizak P.,Alexander Dubcek University, Trencin | Legerska J.,Alexander Dubcek University, Trencin | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2013

Objective evaluation techniques were used in this study of thermo-physiological and performance analyses of knitted fabrics. The KES-FB auto system and the FAST system measure the passages of air and water which were used for evaluation of the physiological properties. Fibrous materials were prepared in the form of integrated knitted fabric which on the back sides had different profiled polyester fibers and on the face sides had the combination of polyester and cotton fibers. Polyester fibers had three different profiles which were studied in dependence of the heat and moisture transfer of knitted fabrics. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Martins S.,Goa University | Fernandes J.B.,Goa University | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2015

The catalytic decomposition of KClO3 is studied in the presence of MnO2, activated carbons and sodium sulphide. This investigation describes the use of thermogravimetry as a convenient technique to investigate catalytic activity of a simple chemical reaction. It is observed that the MnO2 catalyst decreases the decomposition temperature from 480 to 350 °C while the activated carbons cause its decomposition at 320-325 °C. At the same time the carbons undergo facile gasification. Presence of Na2S was the most effective as it induced the carbon-catalysed decomposition of KClO3 at a temperature as low as 220 °C, a temperature at which the carbons were stable and no gasification was observed. © 2014 Akadémiai Kiadó, Budapest, Hungary.


Lizak P.,Alexander Dubcek University, Trencin | Legerska J.,Alexander Dubcek University, Trencin | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2013

In this paper we studied the influence of knitted structures on heat transfer. The structure of the knitted fabric was expressed by geometric properties such as thickness, surface mass and bulked mass, and knitted structure. Heat transfer was experimentally measured on three types of devices. It was found that the measured structural properties do not have a significant effect on heat transfer of knitted fabrics. From three types of devices, the selected device was Alambeta as the most objective method for measuring thermal parameters. It was determined to be the most suitable of knitted structure which provided the best thermal insulation properties. © 2013 Akadémiai Kiadó, Budapest, Hungary.


Lizak P.,Alexander Dubcek University, Trencin | Murarova A.,Alexander Dubcek University, Trencin | Mojumdar S.C.,University of Guelph | Mojumdar S.C.,Trencin University Of bcek
Journal of Thermal Analysis and Calorimetry | Year: 2012

Textiles are used as thermal isolating materials for technical and clothing applications. The paper generally deals with heat transfer through textile layers by conduction, convection, radiation and evaporation of humidity. This experiment evaluates heat transfer by conduction and radiation through textile layers containing hollow polyethylene terephthalate (PET) fibres. The environment created by a composite textile layer containing hollow PET fibres and air is not identical for every method of heat transfer. During heat transfer through a textile layer, we evaluate of the importance of macromorphological structure of the elementary fibres and textile layer, taking into account the thermo-physiological properties. © 2012 Akadémiai Kiadó, Budapest, Hungary.

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