Chemistry Journal of Moldova

DOI: dx.doi.org/10.19261/cjm.2014.09(1).14

Graphical Abstract: Polarization sensitive holographic recording was accomplished in new synthesized azobenzene polymer composites with Co metallic polycomplexes of different structure.




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DOI: dx.doi.org/10.19261/cjm.2014.09(1).15

Graphical Abstract: Information properties of recording media based on electrons donor oligomer of different structure for thermoplastic technique are investigated.





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DOI: dx.doi.org/10.19261/cjm.2014.09(1).16

Graphical Abstract: Current paper focuses on the analysis of influence of main factors (stages of the synthesis, the ratio of the reacting components, the order of their introduction, the concentration of water and ammonia, the synthesis temperature) on the morphology, size and content of functional groups of aminosilicanano- and submicrospheres. The recommendations for the synthesis of particles with predetermined properties were done. It is shown, that the ratio of the reacting components mainly affects the content of 3-aminopropyl functional groups and the temperature of the hydrolytic polycondensation reaction - the size of the particles.




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DOI: dx.doi.org/10.19261/cjm.2014.09(1).17

Graphical Abstract: In this paper we present experimental results on preparation and characterization of colloidal CdSe quantum dots in organic solvent. CdSe QDs were synthesized following a modified literature method.
CdSe QDs were isolated by adding acetone to the cooled solution followed by centrifugation.
CdSe QDs have been characterized by UV-Vis absorption and photoluminescent (PL) spectroscopy. The average CdSe particles size estimated from the UV-Vis absorption spectra was found to be in the range 2.28-2.92 nm which is in good agreement with PL measurements. 

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Abstract (PDF)

DOI: dx.doi.org/10.19261/cjm.2013.08(2).03

Graphical Abstract: Iron-based nanoparticles have gained a lot of attention due to their properties which offer a broad range of biomedical and industrial applications. Traditional methods of synthesis of iron nanoparticles strongly influence their properties and limit their applicability. Recently, there has been a growing interest in the development of biological routes of syntheses of iron nanoparticles as the resulting particles have structural characteristics required by biomedical field. The mechanism for the synthesis of iron-based nanoparticles by microorganisms and its current limitation are presented.



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DOI: dx.doi.org/10.19261/cjm.2012.07(2).02

Graphical Abstract: It was shown by X-ray phase analysis, IR spectra analysis and MALDI-ToF mass spectrometry methods that interaction of synthetic hydroxyapatite with a solution of immunoglobulin G leads to its partial dissolution due to leaching from the surface of calcium triphosphate which, in our opinion, forms complexes with immunoglobulin G.

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DOI: dx.doi.org/10.19261/cjm.2010.05(2).09

Graphical Abstract: The methods of thermogravimetry (TGA) and differential scanning calorimetry (DSC) have been used to study the thermal and thermo-oxidative degradation of polystyrene (PS) and a PS-clay nanocomposite. An advanced isoconversional method has been applied for kinertic analysis. Introduction of the clay phase increasers the activation energy and affects the total heat of degradation, which suggests a change in the reaction mechanism. The obtained kinetic data permit a comparative assessment of the fire resistance of the studied materials.


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DOI: dx.doi.org/10.19261/cjm.2010.05(2).10

Graphical Abstract: Using the Mossbauer spectroscopy and other physical methods it was demonstrated the presence of different iron compounds like β-FeOOH, α-Fe₂O₃, and jarosite mineral type compounds: (R₄N,H₃O)[Fe₃(OH)₆(SO₄)₂] or coordination modes: {RCOO-Fe(L4)-OOCR}1+, {R-CO₂=Fe(X₂)=O₂C-R}n, {R-COO-Fe(X₄)-OOC-R}n, and {(-NCH₂CH₂N-)= Fe(X₂) =(-NCH₂CH₂N-)}, where X= H₂O, OH^-, SO₄^2-., n= from 3- to 1+ in the ion-exchange resins (KU-2, AN-31, AV-17, Varian – AD, EDE-10P) after the contact with sulphate of iron(III) solutions at different conditions: type of solvent, temperature, air atmosphere. In special conditions the ultrafine superparamagnetic particles of Fe₂O₃ have been obtained.


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