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Abstract
Thermoanalytical investigations TGA/DTG/DSC of polyamide–imide enamel after thermal ageing have been presented. The lifetimes at 260, 270, 280, 290, 300 °C were determined. The thermograms of the enamels after attaining of their lifetimes much depend on the ageing temperature. The temperatures of 5% loss of mass that much increase after thermal ageing appear the most sensitive indicator of ageing rate. The residue of mass at 800 °C increases after ageing, even to 27%, due to diffusion of copper ions from the conductor into enamel during annealing. The copper contents in aged coatings could be also an indicator of ageing rate.
formed by microbial decarboxylation and transamination of amino acids to aldehydes or ketones. During ageing or possible degradation, if the reaction conditions are favourable in terms of enzyme activity, the growth of microorganisms leads to the
SBA-15 silicas containing sucrose
Chemical, structural, and thermal studies
auxiliary agent. Obtained materials were fully characterized to elucidate the influence of the synthesis parameters (such as amount of sucrose added or temperature of aging) on the structure-adsorption characteristics. Experimental
Abstract
Differential scanning microcalorimetry (DSC) and UV–VIS absorption spectroscopy were used to obtain the characteristics of blood serum from newborn rat’ after maternal treatment with cyclophosphamide in comparison with control. The obtained DSC curves reveal a complex endothermic peak due to the unfolding process of various serum proteins. Thermal profiles and absorption spectra of blood serum are sensitive to the age of newborns as well as to effect of maternal administration of cyclophosphamide. The most significant disturbances in serum proteome were observed for 14-day old newborns. The thermodynamic parameters: enthalpy change (∆H), the normalized first moment (M1) of the thermal transition with respect to the temperature axis and the ratio of C p ex at 70 and 60 °C describing denaturation contributions of globulin forms in respect to unliganded albumin with haptoglobin was estimated. Moreover, the second derivative spectroscopy in the UV region was used to resolve the complex protein spectrum. The differences in blood serum detected by DSC and UV–VIS confirm a potential usefulness of these methods for diagnostic and monitoring changes with age as well as the pathological state of blood serum.
resulting gel was aged in a teflon-lined stainless steel autoclave at 60 °C for 24 h. The obtained solid was filtered, washed with deionized water until neutral pH and dried overnight at 80 °C [ 23 ]. The preparation of HMS was carried out at the
Fe-containing hydrotalcite, which was synthesized at pH 8.5 ± 0.2. Precipitates were aged in a suspension at 60 °C for 30 min (or 40 °C for Fe-hydrotalcite) under vigorous stirring. In the next step, the suspension was filtered, washed with distilled
not only at early age but also it is very helpful as the more practical parameters of hardened material should be predicted. The DTA/TG method has been commonly used for a long time to characterize the hydration products based on their dehydration
. All patients were diagnosed according to the International Classification of Diseases 10 (ICD-10) diagnostic criteria and composed of 15 males and 23 females aged between 18–60 years. Patients were antidepressant-free for at least 2 weeks, and serums
was formed for 10 min. It was aged at 20 °C for 20 h. Then the aged gel was washed with water until the absence of Cl − ions in the rinsing water and dried in air at 20 °C for 72 h. The part of washed wet gel was subjected to hydrothermal treatment
There are some reports on thermal behaviors of PNIMMO [ 7 – 11 ], and it has been found that PNIMMO decomposed readily to form gases under thermal conditions and was aging, both leading to voids in propellant or explosive compositions. If these
