[seminar] IF

[Ticijana Ban]

 Poštovani,

Obavještavam Vas o održavanju seminara na Institutu za fiziku, Bijenička cesta 46, predavaonica u zgradi Mladena Paića u četvrtak 15. svibnja i petak 16. svibnja 2008. u 15:00 sati.

Seminare naslova Advanced pulsed laser technologies (PLD and MAPLE) for synthesis of biomaterial nanostructures: applications to implantology (četvrtak) i Nanostructured metal oxide thin films for optical gas sensing (petak) održat će Dr. Ion N. Mihailescu sa National Institute for Lasers, Plasma & Radiation Physics, Lasers Department, Bucharest-Magurele, Romania.

Sažetak predavanja možete pronaći u nastavku poruke.
Srdačan pozdrav.

Ticijana Ban
___________________________________________________________________________________________________________________________

Advanced pulsed laser technologies (PLD and MAPLE) for synthesis of biomaterial nanostructures: applications to implantology

 

Ion N. Mihailescu, Carmen Ristoscu, Gabriel Socol

National Institute for Lasers, Plasma & Radiation Physics, Lasers Department, 409 Atomistilor, P.O.Box Mg-54, RO-077125, Bucharest-Magurele, Romania

 

 

    We review recent developments in Pulsed laser deposition (PLD) and Matrix Assisted Pulsed Laser Evaporation (MAPLE) which made possible to deposit high-quality stoichiometric and adherent nanostructured coatings of Ca phosphates (CaPs) and biopolymers. We used targets of Hydroxylapatite (HAP - Ca10(PO4)6(OH)2), octacalcium phosphate (OCP - Ca8(HPO4)2(PO4)4·5H2O), and manganese doped and carbonated hydroxylapatite (Mn:CHA). The depositions were performed with a KrF* (248 nm, 7.4 ns) laser source in low pressure (10 – 50 Pa) oxygen or water vapors on substrates made of grade-4 etched Ti heated up to 400°C. MAPLE was used to deposit hybrid inorganic-organic nanocomposite layers of CaPs and biopolymers. A stoichiometric transfer of the hybrid nanocomposite was demonstrated. Functionality of obtained biomimetic implants have been proved by in vitro (cell morphology, proliferation and viability, cytoskeleton labeling, alkaline phosphatase activity, collagen type 1, transforming growth factor beta 1) and in vivo (pull out) tests.

 

 



 



Nanostructured metal oxide thin films for optical gas sensing        

 

 

Carmen Ristoscu, Ion N. Mihailescu, Gabriel Socol

National Institute for Lasers, Plasma & Radiation Physics, Lasers Department, 409 Atomistilor, P.O.Box Mg-54, RO-077125, Bucharest-Magurele, Romania

 

 

    We synthesize new highly transparent, thin metal oxide films (ZnO, TiO2, WO3) for nanostructured photonic gas sensors. All depositions were highly (up to 90%)transparent. M-line and Mach-Zehnder interferometers (ensuring detection of refractive index variations of ∆n ≥ 10-4) were used to prove that under optimum processing conditions, the obtained nanostructures were able to detect hydrocarbons (butane, propane) traces down to 100 ppm. Developed systems have been redesigned and miniaturized to build up a small prototype for fast detection of gas traces in ambient atmosphere.

 

 

        
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