Chemistry Journal of Moldova

Physical chemistry and chemical physics

Author(s):

Irina Davidenko


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 112-116
Keywords: azobenzene, metallic polycomplexes, polymer composition, electrooptical effect, polarization holohraphy
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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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Author(s):

Nicolay Davidenko, Irina Davidenko, Nicolay Chuprina, Yuriy Getmanchuk., Leonid Kostenko, Elena Mokrinskaya, Valeriy Pavlov, Sergey Studzinsky, Larisa Tonkopieva


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 117-122
Keywords: carbazole, oligomer, photothermoplastic, holographic recording
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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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Author(s):

Inna Melnyk


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 123-127
Keywords: silica nanoparticles and submicrospheres, aminopropyl groups, Stöber method
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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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Author(s):

Ion Geru, Olga Bordian, Constantin Loshmansky, Ion Culeac, Constantin Turta


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2014 Volume 9, no.1
Pages: 128-131
Keywords: colloidal quantum dots, semiconductor, cadmium selenide, nanocrystals, photoluminescence
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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. 


Downloads: 98

Author(s):

Lilia Anghel, Gheorghe Duca


Field: Physical chemistry and chemical physics
Type: Review
Issue: 2013 Volume 8, no.2
Pages: 32-41
Keywords: nanoparticles, iron, microorganisms, biological synthesis, biomedical applications
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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.




Downloads: 50

Author(s):

N. Timbaliuc, T. Lupascu


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 90-94
Keywords: activated carbons, adsorption, mesopore volume, Congo Red, vitamin B12.
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DOI:
dx.doi.org/10.19261/cjm.2013.08(1).11

Graphical Abstract:
The adsorption properties of activated carbons, obtained from local raw materials (nut shells, peach and plum stones), towards Congo Red and vitamin B12 have been studied.  The values of adsorption of these marker-substances are in direct correlation with the structural characteristics of the studied samples of activated carbons, in particular, with their mesopore volume.


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Author(s):

O.G. Kolumbin, L.N. Ognichenko, A.G. Artemenko, P.G. Polischuk, М.A. Kulinsky, Е.N. Мuratov, V.E. Kuz’min, V.A. Bobeica


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2013 Volume 8, no.1
Pages: 95-100
Keywords: pesticides, toxicological analysis, QSAR, lipophilicity, RF method.
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DOI:
dx.doi.org/10.19261/cjm.2013.08(1).12

Graphical Abstract:
In our study the dataset containing 489 pesticides and their active substances of different classes of organic compounds was used for analysis. For compounds of analyzed dataset the values of lipophilicity, water solubility, toxicity, bioavailability and mutagenicity were predicted by developed QSAR models. The most environmentally hazardous substances were identified using prediction of QSAR models for pesticides. The satisfactory coincidence between the experimental values of investigated properties and their predicted values by QSAR models was obtained (coefficient of determination in the range 83-94 %).


Downloads: 36

Author(s):

E. Pylypchuk, V. Mishchenko and T. Yu. Gromovoy


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2012 Volume 7, no.2
Pages: 143-146
Keywords: MALDI-ToF, X-ray phase analysis, albumin, immunoglobulin G, hydroxyapatite, interaction.
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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.


Downloads: 31

Author(s):

Ion Dranca, Nicon Ungur,Tudor Lupascu, Oleg Petuhov


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2010 Volume 5, no.2
Pages: 68-72
Keywords: degradation; fire resistance; nanocomposites; thermogravimetric analysis (TGA); differential scanning calorimetry (DSC).
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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.


Downloads: 25

Author(s):

Vasilii Gutsanu, Constantin Turta, George Filoti


Field: Physical chemistry and chemical physics
Type: Research paper
Issue: 2010 Volume 5, no.2
Pages: 73-82
Keywords: ion exchangers, Mossbauer spectra, iron, superparamagnetic, complexes, polymer phase.
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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-, SO42-., 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.


Downloads: 16