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Dive into the research topics where Ilarion Mihaila is active.

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Featured researches published by Ilarion Mihaila.


RSC Advances | 2015

Properties of some azo-copolyimide thin films used in the formation of photoinduced surface relief gratings

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

Modification of Polymer Blends Properties by Plasma/Electron Beam Treatment. I. Plasma Diagnosis and Bulk Properties of Plasma Treated Blends

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

Diagnosis of a short-pulse dielectric barrier discharge at atmospheric pressure in helium with hydrogen-methane admixtures

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

Pulsed Magnetron Sputtering: The Role of the Applied Power on W Coatings Properties

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

On Electrical Probes Used in Magnetized Plasma Diagnostics

Ilarion Mihaila; M. L. Solomon; C. Costin; Gheorghe Popa


Advances in Space Research | 2016

Formation of positive ions in hydrocarbon containing dielectric barrier discharge plasmas

Ilarion Mihaila; Valentin Pohoata; Roxana Jijie; Andrei Vasile Nastuta; Ioana Rusu; Ionut Topala


Contributions To Plasma Physics | 2014

On Negative Slope of Probe Characteristics in Magnetized Plasmas

Ilarion Mihaila; S. Costea; C. Costin; Gheorghe Popa


Applied Sciences | 2017

Time Behaviour of Helium Atmospheric Pressure Plasma Jet Electrical and Optical Parameters

Ioana Cristina Gerber; Ilarion Mihaila; Dennis Hein; Andrei Vasile Nastuta; Roxana Jijie; Valentin Pohoata; Ionut Topala


Journal of Advanced Research in Physics | 2010

The influence of the thermal treatment on the microstructures of thin cobalt ferrite films

Georgiana Dascalu; Ilarion Mihaila; O. F. Caltun; Gheorghe Popa


Polymer Testing | 2018

Nanoscale analysis of laser-induced surface relief gratings on azo-copolyimide films before and after gold coating

Ion Sava; Iuliana Stoica; Ilarion Mihaila; Valentin Pohoata; Ionut Topala; George Stoian; Nicoleta Lupu

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Valentin Pohoata

Alexandru Ioan Cuza University

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Ionut Topala

Alexandru Ioan Cuza University

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Ioana Cristina Gerber

Alexandru Ioan Cuza University

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Gheorghe Popa

Alexandru Ioan Cuza University

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Andrei Vasile Nastuta

Alexandru Ioan Cuza University

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Alexandru Nita

Alexandru Ioan Cuza University

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C. Costin

Alexandru Ioan Cuza University

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Cosmin Mihai

Alexandru Ioan Cuza University

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Delia Ciubotaru

Alexandru Ioan Cuza University

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Iuliana Stoica

Politehnica University of Bucharest

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