Matrix assisted pulsed laser evaporation of zinc benzoate for ZnO thin films and non-isothermal decomposition kinetics

Rotaru, Andrei; Constantinescu, Cătălin; Mândruleanu, Anca; Rotaru, P.; Moldovan, A.; Györyová, K.; Dinescu, M.; Bálek, V.

doi:10.1016/j.tca.2009.10.006

Cited by 30 publications

(10 citation statements)

References 91 publications

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“…The kinetic studies of the thermal decompositions were usually used for performing lifetime predictions [43,44], for comparative purposes [45,46] or for better understanding of the structural dynamics [47]. Thermal analysis measurements (TG, DTG, DTA and DSC) of TBA and HBA were carried out in air flow (150 mL min -1 ), under nonisothermal linear regime.…”

Section: Investigation Techniquesmentioning

confidence: 99%

Thermal and kinetic study of hexagonal boric acid versus triclinic boric acid in air flow

Rotaru

2016

J Therm Anal Calorim

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Boric acid is a very important inorganic material with diverse uses in optoelectronics, petroleum industry, medicine, agriculture, etc. Recently, it was reported on the modification of the crystallization system of the triclinic boric acid (TBA) to hexagonal boric acid (HBA), when a special obtaining procedure is applied. In this paper, the thermokinetic stability of HBA novel material was comparatively studied with respect to the well-known TBA, in air flow atmosphere. Both HBA and TBA undergo a threestep overall thermal decomposition reaction (dehydration), following similar pathways; from the thermodynamic point of view HBA is more stable-decomposition temperatures and DH are higher in this case compared to those of TBA. The kinetic analysis was performed by means of the isoconversional methods, for each step of dehydration observing different thermokinetic regions. Higher thermal stability for HBA enables it to be employed at higher temperatures instead of TBA, explaining why the triclinic symmetry enhances the formation actually of the pseudohexagonal crystals as crystal habit at the macroscopic scale. Lower thermodynamic and kinetic stability of HBA makes it easier to be activated and thus more instable at the microstructural scale: this is an indirect proof of the TBA presence in the usual surrounding conditions and in the same time raises the probability for HBA molecules to slide onto their crystalline layers due to the lability of hydrogen bonds keeping them and thus increased potential to intercalate with other molecules. The present results open the possibility for promising applications of HBA as a better lubricant for various industries, while in the medical sector superior cleanser, antifungal and antibacterial properties may be foreseen.

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Section: Investigation Techniquesmentioning

confidence: 99%

Thermal and kinetic study of hexagonal boric acid versus triclinic boric acid in air flow

Rotaru

2016

J Therm Anal Calorim

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“…Thermal analysis techniques are frequently used to determine the thermal behavior of various organic and inorganic compounds [55][56][57][58][59][60][61], and especially of functional polymers [62][63][64][65][66]. Although it represents a very important class of techniques used in studying polymers, few papers have been published in the literature about thermal analysis of such thin films [55][56][57], the main reason being low sensitivity due to the thin film/substrate mass ratio, but also due to the rarity of highly exothermic or endothermic effects that can be considered and used as references [57].…”

Section: Thermal Analysis Of the Bulk Polymersmentioning

confidence: 99%

“…Correlating the thermal analysis studies with the absorption characteristics of the polymers and polymer solutions, we can explain why a certain polymeric thin film has higher or lower roughness, and if the molecular structure may have suffered chemical decomposition [59].…”

Section: Characterization Of Pvc Paa and Pani Thin Filmsmentioning

confidence: 99%

Thermal behavior and matrix-assisted pulsed laser evaporation deposition of functional polymeric materials thin films with potential use in optoelectronics

Constantinescu

Rotaru

Nedelcea

et al. 2015

Materials Science in Semiconductor Processing

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“…Thermal analysis of CF obtained of the boric acid, fructose, and calcium carbonate by chemical synthesis showed that between CF on the one hand and its precursors on the other hand, there are no similarities related to thermo analytical curves [18]. Thermal analysis is also used as a method for the controlled step-wise obtaining of the basic functional materials such as CaB 2 O 4 , CdS, ZnO, and Cu 2 O [22][23][24][25][26][27][28][29][30][31]. The results of the thermal analysis, together with those of X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and Raman spectroscopy, led to the conclusion that CF is a natural identical product [32].…”

Section: Molecular Composition Of Cfmentioning

confidence: 99%

Calcium Fructoborate—Potential Anti-inflammatory Agent

Scorei

Rotaru

2011

Biol Trace Elem Res

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Calcium fructoborate is a boron-based nutritional supplement. Its chemical structure is similar to one of the natural forms of boron such as bis-manitol, bis-sorbitol, bis-fructose, and bis-sucrose borate complexes found in edible plants. In vitro studies revealed that calcium fructoborate is a superoxide ion scavenger and anti-inflammatory agent. It may influence macrophage production of inflammatory mediators, can be beneficial for the suppression of cytokine production, and inhibits progression of endotoxin-associated diseases, as well as the boric acid and other boron sources. The mechanisms by which calcium fructoborate exerts its beneficial anti-inflammatory effects are not entirely clear, but some of its molecular biological in vitro activities are understood: inhibition of the superoxide within the cell; inhibition of the interleukin-1β, interleukin-6, and nitric oxide release in the culture media; and increase of the tumor necrosis factor-α production. Also, calcium fructoborate has no effects on lipopolysaccharide-induced cyclooxygenase-2 protein express. The studies on animals and humans with a dose range of 1-7 mg calcium fructoborate (0.025-0.175 mg elemental boron)/kg body weight/day exhibited a good anti-inflammatory activity, and it also seemed to have negligible adverse effect on humans.

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Matrix assisted pulsed laser evaporation of zinc benzoate for ZnO thin films and non-isothermal decomposition kinetics

Cited by 30 publications

References 91 publications

Thermal and kinetic study of hexagonal boric acid versus triclinic boric acid in air flow

Thermal and kinetic study of hexagonal boric acid versus triclinic boric acid in air flow

Thermal behavior and matrix-assisted pulsed laser evaporation deposition of functional polymeric materials thin films with potential use in optoelectronics

Calcium Fructoborate—Potential Anti-inflammatory Agent

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