Search results for "Prussia"

Mixed Valence Materials: Prussian Blue Analogues of Reduced Dimensionality (Small 16/2012)

2012

Toržestva pri berlinskom dvore v doneseniâh sekretarâ anglijskogo posla Filippa Plantamura

2020

Celebrations were an important element in the functioning of royal and princely courts in Europe in the seventeenth and eighteenth centuries. They added splendor to the residences in which they were held and demonstrated the status of rulers: well-directed festivities spoke of their organisers’ political status. Such events not only took place in the closed courtyards of palaces, but also in the open air, which guaranteed a larger audience and made it possible to invite the media. Such events were also observed by foreign diplomats, who described them in their reports. This type of information can be found in the correspondence of Philip Plantamour, secretary of the English Ambassador Georg…

Postnatal overfeeding in rats leads to moderate overweight and to cardiometabolic and oxidative alterations in adulthood.

2011

In contrast to the masses of data on obesity, few data are available concerning the cardiometabolic and oxidative consequences of moderate overweight. The model of postnatal overfeeding (OF) induces an increase in body weight at weaning that remains during adult life. Litters of Wistar rats were either maintained at 12 pups (normal-fed group, NF), or reduced to 3 pups at birth in order to induce OF. At 6 months of age, metabolic parameters, circulating oxidative stress and aortic and coronary vasoreactivity were assessed. Cardiac susceptibility to ischemia-reperfusion injury was also evaluated ex vivo as were markers of cardiac remodeling. OF led to an increase in body weight at weaning (+5…

Electrochemistry of TiO2–iron hexacyanocobaltate composite electrodes

2014

Abstract In this paper we investigate the electrochemical behavior of iron hexacyanocobaltate (FeHCC) in comparison to the cobalt hexacyanoferrate (CoHCF). The best results were achieved on electrochemical synthesized film of FeHCC on the TiO2 modified electrodes. The chemical and physical characterizations confirm the formation of the FeHCC with the classical cubic crystal structure of the Prussian blue analogs, with cell parameter a very close to 10 A, as well as the formation of micro aggregates of TiO2 covered by FeHCC. The synthesis was performed on various substrates such as glassy carbon (GC), graphite foil (GF) and indium tin oxide (ITO) in order to develop new technological applica…

On/Off Photoswitching in a Cyanide-Bridged {Fe2Co2} Magnetic Molecular Square

2013

International audience; A repeatable bidirectional paramagnetic ↔ diamagnetic photomagnetic effect has been observed in the cyanide-bridged Fe-Co square complex {[Fe{B(pz)(4)}(CN)(3)](2)[Co(bik)(2)](2)}(ClO(4))(2)*3H(2)O [B(pz)(4) = tetrapyrazolylborate, bik = bis(1-methylimidazol-2-yl)ketone]. Magnetic measurements and low-temperature single-crystal X-ray diffraction experiments have shown that a complete electron transfer from the diamagnetic Fe(II)-Co(III) state to the paramagnetic Fe(III)-Co(II) metastable state is induced by 808 nm laser light irradiation, whereas the diamagnetic state is recovered in an almost quantitative yield under irradiation at 532 nm.

Zwei wiederentdeckte Briefe Niebuhrs und ein anonymer Aufsatz in der 'Allgemeinen Literatur-Zeitung'

2012

In the archives of the Berlin-Brandenburgische Akademie der Wissenschaften two letters by Barthold Georg Niebuhr of September 1816 are preserved which have never been published in a scholarly edition. The present transcription of the text is diplomatical. Furthermore the letters are examinated in their historical context. The use made of these letters in an anonymous publication in the same year in the Allegmeine Literatur-Zeitung is also discussed.

Insights on the Mechanism of Insoluble-to-Soluble Prussian Blue Transformation

2009

The electrochemical transformation of the soluble form of Prussian blue (PB) material from the insoluble form was monitored using electrochemical, gravimetric, acoustic, and spectroscopic techniques simultaneously. The described combination of in situ techniques represents an innovative tool for measurement in electrochemistry, which provides complementary information on the electrochemical systems. The insoluble-to-soluble PB transformation process takes place during the successive voltammetric cycles between the mixed valence form (PB) and the fully reduced form [Everitt's salt (ES)]. One of the processes that takes place is the exit of free Fe(CN) 4- 6 ions occluded in the vacancies of t…

Ionic and Free Solvent Motion in Poly(azure A) Studied by ac-Electrogravimetry

2011

International audience; This work is focused on the mechanistic aspects of the redox behavior of poly(azure A) taking advantage of the controlled modulation of their oxidation states by ac-electrogravimetry. The originality of this technique is its ability to discriminate between cation and anion involved in the charge compensation process and the accompanying free solvent transfer, directly or indirectly. Two processes were proposed where the faster ionic exchange is considered to be the participation of the anion species acting as counterions whereas the slower one is related to the proton transfer. The proton is implied as reactants for the two electroactive sites identified in the polym…

Kursenieku etniskā kopiena XIX gadsimta beigās – XX gadsimta pirmajā pusē: skaits, izvietojums, vēstures procesi

2013

Elektroniskā versija nesatur pielikumus

Prussian Blue Analogues of Reduced Dimensionality

2012

Abstract: Mixed-valence polycyanides (Prussian Blue analogues) possess a rich palette of properties spanning from room-temperature ferromagnetism to zero thermal expansion, which can be tuned by chemical modifications or the application of external stimuli (temperature, pressure, light irradiation). While molecule-based materials can combine physical and chemical properties associated with molecular-scale building blocks, their successful integration into real devices depends primarily on higher-order properties such as crystal size, shape, morphology, and organization. Herein a study of a new reduced-dimensionality system based on Prussian Blue analogues (PBAs) is presented. The system is …