Ilarion Mihaila
Alexandru Ioan Cuza University
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Publication
Featured researches published by Ilarion Mihaila.
RSC Advances | 2015
Ion Sava; Ada Burescu; Iuliana Stoica; Valentina Musteata; Mariana Cristea; Ilarion Mihaila; Valentin Pohoata; Ionut Topala
Thin free standing films have been obtained by casting from dimethylacetamide solutions of some azo-copolyimides. The dynamo-mechanical and dielectric properties, and the effect of the chemical structure of polymers on the physical properties are investigated. The incorporation of substituted azobenzene groups and hexafluoroisopropylidene units in the macromolecular chain allowed the patterning of the materials under different irradiation conditions. The azo-copolyimide thin films showed high thermal stability, low dielectric constant, good dynamo-mechanical characteristics and uniform surface relief gratings.
International Journal of Polymeric Materials | 2002
Mihaela Pascu; Cornelia Vasile; G. Popa; Ilarion Mihaila; Valentin Pohoata
Films of isotactic polypropylene/epoxy modified lignin have been plasma and electron beam treated, in order to improve the surface properties and their response to environmental factors. The optimal conditions for the treatment have been established by a detailed plasma diagnosis. The effect of the treatment on the films has been followed by: IR-spectroscopy, X-ray diffraction and differential scanning calorimetry. All results have been comparatively discussed with those corresponding to the untreated samples. It has been established that plasma and electron beam treatments are very efficient in imparting a high polarity and an increased hydrophylicity to the polyolefin-based blends.
Physics of Plasmas | 2018
Andrei Vasile Nastuta; Valentin Pohoata; Ilarion Mihaila; Ionut Topala
In this study, we present results from electrical, optical, and spectroscopic diagnosis of a short-pulse (250 ns) high-power impulse (up to 11 kW) dielectric barrier discharge at atmospheric pressure running in a helium/helium-hydrogen/helium-hydrogen-methane gas mixture. This plasma source is able to generate up to 20 cm3 of plasma volume, pulsed in kilohertz range. The plasma spatio-temporal dynamics are found to be developed in three distinct phases. All the experimental observations reveal a similar dynamic to medium power microsecond barrier discharges, although the power per pulse and current density are up to two orders of magnitude higher than the case of microsecond barrier discharges. This might open the possibility for new applications in the field of gas or surface processing, and even life science. These devices can be used in laboratory experiments relevant for molecular astrophysics.
International Conference on Global Research and Education | 2017
Ioana-Laura Velicu; Vasile Tiron; Ilarion Mihaila; Claudiu Costin
The interaction of low/high density transient plasma with tungsten (W) target was investigated via the sputtered material: in the gas phase, measuring the ion energy distribution function, and as deposited coatings, analyzing the compositional, structural, morphological, mechanical and tribological properties. The W target was sputtered in Ar atmosphere, at two different target power densities (instantaneous peak values of 0.2 and 3 kW/cm2), using a pulsed magnetron discharge. All obtained coatings were polycrystalline. A porous columnar structure was observed for the films deposited at low target power density, while denser-than-bulk films were obtained at high target power density. Comparing the high and low power modes, the W+ ion flux is seven times higher in the first case, while the deposition rate is three times higher in the second one.
Contributions To Plasma Physics | 2013
Ilarion Mihaila; M. L. Solomon; C. Costin; Gheorghe Popa
Advances in Space Research | 2016
Ilarion Mihaila; Valentin Pohoata; Roxana Jijie; Andrei Vasile Nastuta; Ioana Rusu; Ionut Topala
Contributions To Plasma Physics | 2014
Ilarion Mihaila; S. Costea; C. Costin; Gheorghe Popa
Applied Sciences | 2017
Ioana Cristina Gerber; Ilarion Mihaila; Dennis Hein; Andrei Vasile Nastuta; Roxana Jijie; Valentin Pohoata; Ionut Topala
Journal of Advanced Research in Physics | 2010
Georgiana Dascalu; Ilarion Mihaila; O. F. Caltun; Gheorghe Popa
Polymer Testing | 2018
Ion Sava; Iuliana Stoica; Ilarion Mihaila; Valentin Pohoata; Ionut Topala; George Stoian; Nicoleta Lupu