Effects of divalent metal ions on the flame retardancy and pyrolysis products of alginate fibres

Spectroscopic, thermal and mechanical studies on 4-methylanilinium p-toluenesulfonate - a new organic NLO single crystal.

Several analytical instruments (like pyrolyzers, thermobalances, differential thermal analyzers, or calorimeters, and sometimes simply temperature-controlled reactors) can be on-line coupled to infrared spectrometers to perform evolved gas analysis (EGA). Advances in EGA techniques are currently proposed by the scientific literature because the possibility to on-line detect the nature of the released gases or vapors has become fundamental to proving a supposed reaction, either under isothermal or under heating conditions. In this review, recent analytical applications of evolved gas analysis performed by infrared spectroscopy (EGA-IR), selected among those published in the years 2013 to 2015, are collected.

FTIR-evolved gas analysis in recent thermoanalytical investigations

A third order nonlinear optical (NLO)single crystals of sodium succinate hexahydrate (SSH) (β phase) has been grown by a slow evaporation growth technique using aqueous solution at ambient temperature. The lattice parameters and morphology of SSH were determined by single crystal X-ray diffraction analysis. SSH crystallizes in centrosymmetric monoclinic system with space group P 2 1 / c and the crystalline purity was analyzed by powder X-ray diffraction analysis. The UV–vis–NIR spectrum reveals that the crystal is transparent in the entire visible region. The recorded FT-IR spectrum verified the presence of various functional groups in the material. NMR analysis of the grown crystal confirms the structural elucidation and detects the major and minor functional groups present in the title compound. ICP-OES analysis proved the presence of sodium in SSH. TG-DTA/DSCanalysis was used to investigate the thermal stability of the material. The dielectric permittivity and dielectric loss of SSH were carried out as a function of frequency for different temperatures and the results were discussed. The mechanical stability was evaluated from Vicker's microhardness test. The third order nonlinear optical properties of SSH has been investigated employing Z-scan technique with He-Ne laser operating at 632.8 nm wavelength.

Growth, optical, thermal, mechanical and dielectric studies of sodium succinate hexahydrate (β phase) single crystal: A promising third order NLO material

A correct interpretation for the mechanism of a thermally induced reaction, involving the formation of gaseous species, is strongly dependent on the characterization of the evolved products.The analytical applications of evolved gas analysis (EGA) performed by infrared spectroscopy (IR-EGA) for the period 2010–2012 are reviewed in this article. When the nature of volatile products released by a substance subjected to a controlled temperature program were determined on-line, the results proved a supposed reaction, under either isothermal or heating conditions.

R. J. Giagio

Papers

Thermal behaviour of malonic acid, sodium malonate and its compounds with some bivalent transition metal ions