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Journal of Thermal Analysis and Calorimetry
Authors:
V. Sydorchuk
,
S. Khalameida
,
J. Skubiszewska-Zięba
, and
R. Leboda

. Therefore, these compounds are perspective as oxidation catalysts [ 3 – 5 ], electro- and photochromic species [ 6 , 7 ], photocatalysts [ 2 , 3 , 8 , 9 ]. In other words, HPCs are versatile materials and have potential for numerous technological

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Journal of Thermal Analysis and Calorimetry
Authors:
A. Caneiro
,
L. Mogni
,
N. Grunbaum
, and
F. Prado

Introduction The no-stoichiometry in oxides can be related to the presence of cationic or anionic defects through the formation of interstitials or vacancies in the crystal structure. These point defects in the lattice modify

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Introduction Selective oxidation of lower alkenes receive much attention in fundamental and applied research projects due to the importance of the reaction products for various industrial applications [ 1 – 3 ]. More than one

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Journal of Thermal Analysis and Calorimetry
Authors:
A. Caneiro
,
L. Mogni
,
N. Grunbaum
, and
F. Prado

Introduction Oxide mixed conductors exhibiting both electronic and ionic conductivity have attracted much attention in the last years due to their potential application in high temperature electrochemical devices such as

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Alving K., Weitzberg E., Lundberg J. M.: Increased amount of nitric oxide in exhaled air of asthmatics. Eur. Respir. J., 1993, 6 , 1368–1370. Lundberg

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against burn-induced oxidative skin injury. Burns., 2007, 33 , 908–916. Erkanli G. Silymarin, the antioxidant component of Silybum marianum, protects against burn-induced oxidative

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Polyethylene oxides

Analysis of tablet formation and properties of the resulting tablets

Journal of Thermal Analysis and Calorimetry
Author:
Katharina Picker-Freyer

Abstract  

The aim of this study was to study tablet formation of polyethylene oxides (PEOs) with different molecular masses by means of 3D modeling and comparing the results to those of other more traditional techniques, such as Heckel analysis, analysis by the pressure- time function and energy analysis. The molecular masses ranged between 400,000 and 7,000,000 Da. Material properties, such as water content, particle size and morphology, and glass transition temperature were also studied. To complete this study, elastic recovery dependent on maximum relative density and time were determined. Furthermore, the crushing force of the tablets and their morphology were analyzed. The PEOs consist of smooth edged particles of irregular shape; the particle size is similar to one type of MCC, namely Avicel PH 200. The PEOs are much more ductile during compression than MCC. Elastic recovery after tableting is higher than that for tablets made from MCC and continues for some time after tableting. The crushing force of the resulting tablets is low. In conclusion, with regards to direct compression the PEOs do not appear to be useful as sole tableting excipients.

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Acta Agronomica Hungarica
Authors:
G. Kocsy
,
Magda Pál
,
A. Soltész
,
G. Szalai
,
Á. Boldizsár
,
V. Kovács
, and
T. Janda

Apel, K., Hirt, H. (2004): Reactive oxygen species: metabolism, oxidative stress, and signal transduction. Annu. Rev. Plant Biol. , 55 , 373–399. Hirt H. Reactive oxygen species

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References [1]. B. Halliwell J. M. C. Gutteridge 2007 Cellular responses to oxidative stress: adaptation, damage, repair, senescence and death B. Halliwell J. M. C. Gutteridge Free Radicals in Biology and Medicine Oxford

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formation of a film of corrosion products seen by visual inspection. It is likely that the main constituent of the film is cooper oxide. The EIS spectra are shown in Bode plots of the logarithm of the impedance magnitude and of the phase angle as

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