miran Mozetic

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Papers by miran Mozetic

Space Resolved Optical Emission Spectroscopy of Inductively Coupled RF Water Plasma

Low temperature plasmas have a broad area of applications for treatment of various materials whic... more Low temperature plasmas have a broad area of applications for treatment of various materials which points to the need of real time plasma characterization during processing [1,2]. Inductively coupled plasmas are of particular interest since details of the inductive coil design and its surrounding can be used to influence plasma content. Water plasma is of special interest since it could be used for sterilization [3]. In the present work we characterize a discharge vessel used for studying gas plasma interactions with water vapours by means of an optical emission spectroscopy (OES) [4] and a fiber optics catalytic probe (FOCP) [5]. The discharge vessel was a linear tube with outer diameter of 40 mm made of a borosilicate glass which has a good transparency from 300 nm to IR. The tube was connected to the vacuum system, which provides the pumping speed of 35 m 3 /h and the base pressure of 1 Pa. The pressure in the system was measured with a Baratron gauge. The flow of the gas was con...

Mass-energy spectrometry of atmospheric pressure RF discharges

X-ray absorption cell for alkaline metal vapors

Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 1996

Tiny effects of collective motion of the atomic system are revealed in X-ray absorption spectrome... more Tiny effects of collective motion of the atomic system are revealed in X-ray absorption spectrometry on free-atom samples. In construction of an absorption cell for alkaline metal vapors the main problem is to devise vacuum-tight windows thin enough to transmit the X-ray beam, and still resistant to the aggressive vapors. A successful operation of the cell is demonstrated by K-edge

X-ray absorption cell for alkaline metal vapors

Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1996

... Research B 111 (1996) 161-162 HMB Beam Interactions with Materials & Atoms X-ray absorpti... more

Different source atelocollagen thin films: Preparation, process optimisation and its influence on the interaction with eukaryotic cells

Collagen thin films were prepared via bovine atelocollagen matrices. The film casting was carried... more Collagen thin films were prepared via bovine atelocollagen matrices. The film casting was carried out by using different culture dishes, concentrations, equipment, drying processes and periods of time. In order to optimise the repeatability and reproducibility, microscopic analyses were utilised to explore the film quality and topographical patterning. In addition, the human immortalised non-tumorigenic keratinocyte cell line (HaCaT) was seeded onto the obtained specimens, and the cell proliferation was determined by using the MTT assay. These results indicated how the substrate, its concentration and processing conditions influence the cellular response. The attempted technique shows itself to be an excellent procedure for continuous collagen film preparation with optimal cell-proliferation rates, which may potentially be used in tissue engineering or wound-healing applications.

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Oxidation of SiC in low-pressure CO2 plasma: formation of silica nano-needles

ABSTRACT

Plasma modification of titanium for repulsion of blood platelets

Thrombosis and restenosis are the most common problems during insertion of biocompatible implants... more Thrombosis and restenosis are the most common problems during insertion of biocompatible implants like titanium stents into human blood, due to aggregation of platelets on its surface. Due to this reason, we studied the response of blood platelets to plasma treated titanium surface. The aim was to design a functionalized surface which would repel blood platelets or prevent their adhesion. Therefore, we functionalized surfaces with low-temperature inductively coupled oxygen plasma treatment, which in first stage cleaned surface of titanium, and in second promoted incorporation of oxygen functional groups as well as growth of titanium dioxide film. In this presentation, we show that oxygen atoms or oxygen containing groups play important role in repulsion of platelets and their deactivation. At the same time, increased surface temperature of samples either through sequential thermal deactivation in a heat oven at 150 oC or heating the surface with ion bombardment during the treatment, lowers the oxygen content and the surface repulsion for platelets. 1.

Treatment of Paulownia tomentosa seeds in the low pressure CCP reactor

by Saša Lazović and miran Mozetic

Properties and bio-medical applications of non-thermal plasma

Effect of dissipated power due to antenna resistive heating on E-to H-mode transition in inductively coupled oxygen plasma

by Uroš Cvelbar, Saša Lazović, and miran Mozetic

The problem of the effective power input into plasma is investigated for the inductively coupled ... more The problem of the effective power input into plasma is investigated for the inductively coupled RF oxygen discharge operated at 13.56 MHz. The power significantly deviates especially at the E-to H-mode transition. In order to enlighten this phenomenon the U-I characteristics of the discharge are recorded. With these data, we have recalculated the power deposited into plasma and determined the effective power losses due to the resistive antenna heating. The E-H mode transition is investigated in the pressure range from 10 to 200 Pa. With an increase of the working gas pressure, the threshold for the E-H transition moves towards the higher powers. The transition exhibits a hysteresis for the pressures higher than 10 Pa. When the dissipated power due to the antenna resistive heating is taken into account, the characteristic hysteresis profile skews towards lower power as compared to the case of taking generator power as a relevant parameter. This means that the E-mode is strongly affected by the way the power is obtained, while for the H-mode the generator power can be considered as a relatively good external parameter.

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Method for the evaluation of the degree of pigment dispersion in powder coatings

by Matjaž Kunaver, miran Mozetic, and Marta Gunde

Powder Technology, 2004

The quantitative method for the evaluation of the degree of pigment dispersion in powder coatings... more The quantitative method for the evaluation of the degree of pigment dispersion in powder coatings is described here. The quantitative information is obtained using selective oxygen plasma etching, scanning electron micrography and image analysis. This procedure was used in order to analyse the influences of the input power of the extrusion equipment on the pigment dispersion in powder coatings. The

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Microstructure analysis of metal-effect coatings

by Matjaž Kunaver, miran Mozetic, Marta Gunde, and Marjan Bele

Surface Coatings International Part B-coatings Transactions, 2002

Summaries The microstructure of a system of metal-effect coatings was studied with respect to th... more Summaries The microstructure of a system of metal-effect coatings was studied with respect to the types of metal falkes used, their dispersion and their orientation. Some indirect and some direct methods were applied on the same silver metallic acrylic coatings and blue metallic acrylic coatings, prepared with various amounts of different types of metallic flakes. Indirect methods were used to measure

The degree of dispersion of pigments in powder coatings

by Matjaž Kunaver, miran Mozetic, and Marta Gunde

Dyes and Pigments, 2003

Assessment of the state of a pigment dispersion in powder coatings is hindered by the lack of a s... more Assessment of the state of a pigment dispersion in powder coatings is hindered by the lack of a simple and effective method of evaluation, particularly during the production process. A method for evaluating dispersion quality in cured powder coatings or in samples taken immediately after the extrusion process is described in this paper. Quantitative information of pigment dispersion were obtained

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Surface Treatment of Polymeric Materials Controlling the Adhesion of Biomolecules

Journal of Functional Biomaterials, 2012

This review describes different strategies of surface elaboration for a better control of biomole... more This review describes different strategies of surface elaboration for a better control of biomolecule adsorption. After a brief description of the fundamental interactions between surfaces and biomolecules, various routes of surface elaboration are presented dealing with the attachment of functional groups mostly thanks to plasma techniques, with the grafting to and from methods, and with the adsorption of surfactants. The grafting of stimuli-responsive polymers is also pointed out. Then, the discussion is focused on the protein adsorption phenomena showing how their interactions with solid surfaces are complex. The adsorption mechanism is proved to be dependent on the solid surface physicochemical properties as well as on the surface and conformation properties of the proteins. Different behaviors are also reported for complex multiple protein solutions.

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Morphology Transformations of Platelets on Plasma Activated Surfaces

Plasma Processes and Polymers, 2014

Improved hemocompatibility from the perspective of platelets adhesion and activation on polyethyl... more Improved hemocompatibility from the perspective of platelets adhesion and activation on polyethylene terephthalate surfaces has been addressed. The activation stage of platelets has been determined from their size and morphology using scanning electron microscopy (SEM). The activation of platelets on untreated polymer materials was very intensive. Polymer materials were treated with weakly ionized oxygen plasma in order to repel platelet adhesion. Already short treatment times (3s) showed significant reduction of the total number and of highly activated forms of adhered platelets. Possible mechanisms of different behaviour of blood platelets on plasma treated polymer were discussed in terms of surface adhesion and changes in morphology.

Surface analysis of demages on escherichia coli caused by oxygen plasma radicals

2008 IEEE 35th International Conference on Plasma Science, 2008

ABSTRACT Inductively coupled oxygen plasma was used to study degradation of Escherichia coli. Bac... more ABSTRACT Inductively coupled oxygen plasma was used to study degradation of Escherichia coli. Bacteria were deposited on a silicon wafer substrate and treated by plasma for different periods. The effect of oxygen plasma ions and neutral oxygen atoms was observed by atomic force microscopy (AFM) and scanning electron microscopy (SEM). The first effect was removal of the envelope - a protective coating bacteria developed during growing. After removing the envelope (capsule), slow etching of the cell wall was observed. Further treatment resulted in gradual removal of the cell wall and after 240s, only ashes remained. Images of plasma interaction steps during bacteria degradation are presented and the plasma radical interaction steps explained by observed damages of bacteria.

Etching of carbon-tungsten composite with oxygen plasma

by miran Mozetic and Marta Gunde

The removal rate of carbon from amorphous graphite–tungsten composite during cleaning in oxygen p... more The removal rate of carbon from amorphous graphite–tungsten composite during cleaning in oxygen plasma was studied. The composite was prepared by sputter deposition from C and WC-targets in Ar atmosphere. A total thickness of deposited layer was about 1μm. The samples were treated in a weakly ionized highly dissociated oxygen plasma created in a microwave discharge at a power of

Inductively coupled RF oxygen plasma characterization by optical emission spectroscopy

Vacuum, 2007

Optical emission spectroscopy was applied for the characterization of inductively coupled RF oxyg... more Optical emission spectroscopy was applied for the characterization of inductively coupled RF oxygen plasma at pressures between 10 and 300Pa. The plasma was generated with an RF generator at a frequency of 27.12MHz and output power of 300W. Spectra were measured in the range 200–1100nm by an optical spectrometer. At high pressure, the main spectral features observed were the wavelengths

XAS study of oxygen plasma-treated micronized iron oxide pigments

Vacuum, 2005

The stability of commercially available yellow (Bayferrox 3920) and red (Bayferrox 140) micronize... more The stability of commercially available yellow (Bayferrox 3920) and red (Bayferrox 140) micronized iron oxide pigments against highly aggressive treatment with oxygen plasma is examined. The red pigment microparticles with hematite crystal structure are stable, while the yellow pigment changes colour during the treatment. Structural analysis with powder X-ray diffraction and X-ray absorption methods, EXAFS and XANES, shows that the yellow pigment microparticles recrystallize from goethite to hematite crystal structure. Larger hematite particles are composed of small highly anisotropic nano-domains. No nanoclusters or amorphous iron oxide phases are detected. The valence state of iron atoms in the pigments is not affected by the strongly oxidative plasma environment.

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Enhanced printability of polyethylene through air plasma treatment

Vacuum, 2013

Low-density polyethylene (LDPE) foils were surface-modified by using non-thermal non-equilibrium ... more Low-density polyethylene (LDPE) foils were surface-modified by using non-thermal non-equilibrium oxidative air 40 kHz frequency, radiofrequency (RF) and microwave (MW) discharge plasma treatment. The pristine and treated specimens were morphologically and chemically characterised by Scanning Electron Microscopy (SEM) imaging, X-ray Photoelectron Spectroscopy (XPS) and contact angle measurement with surface energy evaluation. In addition, printability and ink adhesion tests were carried out on the samples, and quantitatively appraised by UVeVIS transmission spectroscopy. The overall outcome indicated chemical and physical changes after each treatment, and the improvement of printability. The present approach could serve as a viable and promising method to improve printability of polyethylene.

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