2011 - Europe Direct Iasi
2011 - Europe Direct Iasi
2011 - Europe Direct Iasi
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EUROINVENT <strong>2011</strong><br />
thermal treatment), favoring appearance of a large<br />
magnetoresistance effect. The magnetic behavior of the Zn-Co<br />
thin films is determined by their morphology produced during<br />
the electrodeposition, and modified as a consequence of the<br />
subsequent thermal treatment. The coercivities of the samples<br />
increase after thermal treatment at 350 o C. We have found by<br />
torsion magnetometer measurements that magnetic anisotropy<br />
easy axis is out of plane for as-deposited films and there is an<br />
antiferromagnetic type of interaction between grains.<br />
Magnetoresistance (MR) measurements were carried out in dc<br />
magnetic field by means of current in plane device configuration.<br />
We obtained the magnetoresistance values comprised between<br />
5% and 35% for the samples after thermal treatment. The large<br />
magnetoresistance effect obtained for the Zn-Co thin films after<br />
thermal treatment makes them useful for technological<br />
applications in the domain of magnetoresistive sensors with good<br />
corrosion resistance.<br />
R.25.<br />
Title Microwave assisted synthesis of blue luminophors<br />
Gheorghiţă Zbancioc, Costel Moldoveanu, Vasilichia Bejan and<br />
Authors<br />
Ionel Mangalagiu<br />
Institution Al.I. Cuza University, Faculty of Chemistry<br />
Recent studies show that pyrrolopyridazine (PP) derivatives<br />
represent such a class, being a ‘pure’ blue-emitting moiety.<br />
Microwave irradiation has become an increasingly valuable tool<br />
in organic chemistry, since it offers a versatile and facile<br />
pathway in a large variety of syntheses. Solid phase reactions<br />
have the great advantage of using no organic solvents (‘solventfree’),<br />
such reactions being more environmentally friendly and<br />
generate less side products. The application of microwave<br />
irradiation under solvent-free conditions enables organic<br />
reactions to occur expeditiously at ambient pressure, providing<br />
unique chemical processes with special attributes such as higher<br />
Description<br />
yields, shorter reaction time, milder conditions and the associated<br />
ease of manipulation.<br />
The aim of this work was to synthesise new fluorescent PPs, to<br />
study the relationship between optical properties and structure<br />
(the effect of substituents and conjugation), and to develop a new<br />
environmentally friendly method for preparation of these<br />
derivatives using MW technologies (in liquid and solid phase).<br />
Application<br />
Synthesis of highly fluorescent derivatives with extended πconjugation<br />
stirs strong interestbecause of their applications as<br />
sensors and biosensors, electroluminescent materials, lasers and<br />
other optoelectronic devices.<br />
Innovative Researches<br />
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