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Mechanical properties of Cr-DLC layers prepared by hybrid laser technology
Písařík, Petr ; Jelínek, Miroslav ; Remsa, J. ; Tolde, Z.
Diamond like carbon (DLC) layers have excellent biological properties for use in medicine for coating implants, but poor adhesion to biomedical alloys (titanium alloys, chromium alloys and stainless steel). The adhesion can be improved by doping the DLC layer by chromium, as described in this article. Chromium doped diamond like carbon layers (Cr DLC) were deposited by hybrid deposition system using KrF excimer laser (deposition diamond like carbon - graphite target) and\nmagnetron sputtering (deposition chromium - chromium target). Carbon and chromium contents were determined by wavelength dispersive X-ray spectroscopy.\n
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DLC/TI thin films properties prepared by hybrid laser technologies
Mikšovský, Jan ; Jelínek, Miroslav ; Písařík, Petr ; Kocourek, Tomáš ; Remsa, J. ; Jurek, Karel
Layers of diamond-like carbon are usable in many fields of industry as well as in medicine. Many scientific groups have worked with different types of deposition techniques to prepare DLC layers with improved or unique properties. The DLC properties could be improved by various dopations. In this study, we focused on DLC layers doped by titanium, prepared by hybrid laser depositions. Two techniques were used: Dual pulse laser deposition (DualPLD) and pulse laser deposition in combination with magnetron sputtering (PLD/MS). Preliminary tests for morphology, wettability, adhesion, hardness, corrosion, friction and wearability were examined. DLC samples were prepared on Si(100) wafer and on Ti6Al4V alloy substrates with titanium concentration from pure up to 25 at.%. Friction of the prepared layers ranged from 0.09 to 0.18. The films exhibited very low wear for loads 1 N and 2 N.\n
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Scanning thermal microscopy of thermoelectric pulsed laser deposited nanostructures
Vaniš, Jan ; Zelinka, Jiří ; Zeipl, Radek ; Jelínek, Miroslav ; Kocourek, Tomáš ; Remsa, Jan ; Navrátil, Jiří
New materials with high possible figure of merit ZT are of high interest as a promising candidates for thermoelectric applications such as energy harvesting. Miniaturization of such systems tends toward developing of the suitable characterization method with nanometer resolution ability. In our contribution, we present the development and experimental results of a simple scanning probe microscopy method for the relative thermal conductivity characterization. The possibility of the setup is demonstrated on the set of different thin thermoelectric layers grown from hot pressed targets by pulsed laser deposition on the reference Si substrate. All the measurements were performed on the commercial Veeco Multimode scanning AFM/STM microscope with home developed controller and by using PicoCal Inc. bolometer probes with tungsten resistive path. All the experiments were done in the air at the ambient condition. Additional sample treatment for the measurement will be also briefly described
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Study of bio-compatible materials using FTIR spectroscopy
Zezulová, M. ; Jelínek, Miroslav
Infrared (IR) spectroscopy is used for the measurement of absorption spectra of analyzed material in IR wavelength region. We studied TiO2 layers prepared by PLD (Pulsed Laser Deposition) method. We measured IR spectra in region 600-100 cm-1 and 4000-600 cm-1. During the measurement of samples with different accessories we found strong IR spectra in region 600-100 cm-1 on the samples exhibited brookite phase.
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Nanokompozitní Ag-HA biokompatibilní vrstvy
Jelínek, Miroslav ; Weiserová, Marie ; Kocourek, Tomáš ; Jurek, Karel ; Strnad, J. ; Kudrna, P.
Příspěvek pojednává o přípravě KrF laserem a studiu dopovaných biokompatibilních materiálu se zaměřením na hydroxyapatit (HA). Je uveden přehled materiálů užívaných pro dopaci. Jsou uvedeny experimentální výsledky HA vrstev dopovaných stříbrem. Vlastnosti vrstev byly určovány pomocí profilometru, SEM, WDX, XRD a optické transmise. Obsah stříbra ve vrstvách HA se pohyboval od 0,06 do 13,7 at.%. Antibakteriální vlastnosti HA, stříbra a dopovaných vrstev HA stříbrem byly studovány “in vivo” pomocí buněk Escherichia coli.
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