Estrutura e propriedades da difenil-4-amina sulfonato de sódio: um dopante de filmes condutores

This work contains the theoretical simulation of the conformation of diphenyl-4-amine sodium sulphonate (DASNa) and correlates its geometry with conductivity, showing that the conductivity increases as the molecule becomes more planar. The solvent effect was also evaluated, using water and dimethylsulfoxide. Some properties, such as bond distance, vibration al frequency and effective charge were calculated. The utilization of diphenyl-4-amine sodium sulphonate (DASNa) as dopant of aniline was investigated in view of the HOMO-LUMO energy gap.

Johdanto Suomen kirjallishistoriaan

Rietrik (Fredrik) Polén (1823-1884) oli toimittaja, kustantaja ja opettaja, suomalaisuusaatteen ajaja. Hän toimitti Suometarta vuosina 1851-1866 ja julkaisi Lönnrotin toimittamaa Mehiläistä vuosina 1859-1863. Kummallekaan lehdelle ei ollut tuolloin riittävää lukijakuntaa, vaan ne päätyivät lakkautukseen, ja Polén itse puolestaan henkilökohtaiseen vararikkoon. Sittemmin Polén toimi suomen kielen ja historian opettajana, ja avusti vielä kirjoituksillaan useaa eri lehteä. Suomalaisen koululaitoksen kehittäminen ja kansansivistys olivat Polénin ydinaatteita. Vuonna 1858 ilmestynyt Polénin opinnäyte oli ensimmäinen suomenkielinen väitöskirja, ja sen ohjaajana toimi Elias Lönnrot. Polén halusi myös tieteellisen tutkimuksen olevan kaikelle kansalle avointa.

Synthesis, characterization and thermal behaviour of solid-state compounds of benzoates with some bivalent transition metal ions

Solid-state MBz compounds, where M stands for bivalent Mn, Fe, Co, Ni, Cu and Zn and Bz is benzoate, have been synthesized. Simultaneous thermogravimetry and differential thermal analysis (TG-DTA), differential scanning calorimetry (DSC), infrared spectroscopy and complexometry were used to characterize and to study the thermal behaviour of these compounds. The procedure used in the preparation of the compounds via reaction of basic carbonates with benzoic acid is not efficient in eliminating excess acid. However the TG-DTA curves permitted to verify that the binary compounds can be obtained by thermosynthesis, because the benzoic acid can be eliminated before the thermal decomposition of these compounds. The results led to information about the composition, dehydration, thermal stability, thermal decomposition and structure of the isolated compounds. On heating, these compounds decompose in two (Mn, Co, Ni, Zn) or three (Fe, Cu) steps with formation of the respective oxide (Mn3O4, Fe2O3, Co3O4, NiO, CuO and ZnO) as final residue. The theoretical and experimental spectroscopic studies suggest a covalent bidentate bond between ligand and metallic center.

Resistência mecânica de hidrogéis termo-sensíveis constituídos de Alginato-Ca2+ / PNIPAAm, tipo Semi-IPN

Thermosensitive hydrogels were synthesized using alginate-Ca2+ in association with a thermosensitive polymer, such as PNIPAAm. The mechanical properties of the hydrogels were determined measuring the maximum tension of deformation. With the increase of the temperature by 25 to 40 ºC above the LCST the chains of PNIPAAm collapsed, dragging the alginate net and diminishing the size of the pores. The decrease in the size of the pores of the hydrogel was followed by an increase in the mechanicals resistance of the material.

Hypomnemata guaedam in Chronicon episcoporum Aboensium a Paulo Justen consignatum

Invocatio: I.N.J.C.

De temperamento

Invocatio: KREIKKAA Alpha, omega.

De columbis

Invocatio: KREIKKAA Alpha [et] omega.

De calido innato

Invocatio: KREIKKAA Sun to Theo meno athanato.

De vulneribus Christi

Invocatio: D.O.M.A.

De templo cathedrali Aboënsi

Invocatio: I.N.D.

Om caffé och de inhemska wäxter, som pläga brukas i des ställe

Invocatio: I.J.N.

De pietate parentum et liberorum reciproca

Invocatio: Jehovah secundet.

De psychologia

Dedicatio: Samuel Wiraenus, Enevaldus Widbecchius, Andreas Hornaeus, Zacharias Hornaeus, Wilhelm Granberg, Jonas Hagelin.

Caracterização de escamas do peixe piau (Leporinus elongatus) e sua aplicação na remoção de Cu(II) de meio aquoso

Characterization of fish scales of Leporinus elongatus and their application in the removal of Cu(II) from aqueous solutions are described. It was observed that the scales are mainly formed by hydroxyapatite and type I collagen. Adsorption of Cu(II) was performed using batch experiments at 25 0C. The ANOVA statistical results have shown that the Langmuir model was successful applied to determine the maximum adsorption capacity of 2.686 x10-4 mol g-1 and the Langmuir equilibrium parameter (b) of 168.8 L mol-1. The Langmuir separation parameter, R L, has shown favorable adsorption of Cu(II) on the scales.

De dolo Gibeonitarum

Invocatio: [hepreaa].