September 17th (Tuesday) | 10.00 h
Antibacterial Nanostructured Ti Coatings by Magnetron Sputtering: From Laboratory Scales to Industrial Reactors
Dr. Alberto Palmero Acebedo
Based on an already tested laboratory procedure, a new magnetron sputtering methodology to simultaneously coat two-sides of large area implants (up to ~15 cm2) with Ti nanocolumns in industrial reactors has been developed. By analyzing the required growth conditions in a laboratory setup, a new geometry and methodology have been proposed and tested in a semi-industrial scale reactor. A bone plate (DePuy Synthes) and a pseudo-rectangular bone
plate extracted from a patient were coated following the new methodology, obtaining that their osteoblast proliferation efficiency and antibacterial functionality were equivalent to the coatings grown in the laboratory reactor on small areas. In particular, two kinds of experiments were performed: Analysis of bacterial adhesion and biofilm formation, and osteoblasts–bacteria competitive in vitro growth scenarios. In all these cases, the coatings show an opposite behavior toward osteoblast and bacterial proliferation, demonstrating that the proposed methodology represents a valid approach for industrial production and practical application of nanostructured titanium coatings.
ICMS-sci-talks are held by scientists from the Materials Science Institute of Seville with the aim of discussing and disseminating their research activity. They consist of 20-25 min talks focussed on a recently published paper.
These talks take place about every three weeks at 10.00 am in the seminar room at cicCartuja2 (yellow building).
October 24th (Thursday) | 11.00 h
Salón de Grados CicCartuja2
Multi Photon Phosphors
Dr. Andries Meijerink
Lanthanides have transformed the world of lighting in the past 40 years. Presently, almost all artificial light sources rely on emission of light by lanthanide ions. In many luminescent materials, also known as phosphors, one-to-one photon conversion downshifts one high energy photon to one lower energy photon in the desired spectral region. However, recently, there is a significant increase of attention for multi-photon phosphors relying on multi-photon conversion processes, either upconversion or downconversion. Insight in the multi-photon processes is not trivial but is needed to understand the mechanism and improve the efficiency of spectral conversion processes in multi-photon phosphors which is crucial for applications, including solar cells to reduce spectral mismatch losses.
In this presentation a short historical introduction to single- and multi-photon conversion phosphors will be followed by an overview of recent developments of efficient up- and downconversion materials. Next it will be discussed how insight can be obtained in the mechanism and efficiency of up- and downconversion processes. An important aspect involves modelling of energy transfer and ligand quenching. For both up- and downconversion examples will be given on how modelling of luminescence decay curves can provide quantitative insight. A new ligand-quenching model will be presented and applied to understand multi-phonon vibrational quenching in NaYF4:Er,Yb upconversion nanocrystals. Finally a new method will be presented that provides direct proof for downconversion. Correlated emission of photons in photon cutting materials can serve as a fingerprint for the occurrence of downconversion and can even be used to quantify the downconversion efficiency.
Figure 1 – Illustration correlated photon counting to demonstrate two-photon emission using NaLaF4:Pr3+ as model system. (a) Two-photon emission on Pr3+. (b) Schematic set-up for correlated photon counting (c, d) Emission of Pr3+ in blue and red spectral region detected by separate detectors. (e) Correlated photon-counting signal.
The invited conferences are held by researchers form groups in topics of utmost interest to our Institute. With the conferences, we intend to favour the stablishment of conctacts between the invited researchers and our research groups.
The invited seminars are held montly on Thursday mornings, in the Seminars room at cic-cartuja 2 (yellow building).
Seminario cicCartuja2 / Salón de Grados cicCartuja2
Seminario CIC-Cartuja 2
ICMS Invited Lectures
Salón de Grados cicCartuja2
Americo Vespucio 49
Isla de la Cartuja Sevilla
Centro de Investigaciones Científicas Isla de la Cartuja. C/Américo Vespucio, 49 – 41092 Sevilla (España)
Tel.: (+34) 954489527 | Fax: (+34) 954460165 | se.ci1568760206sc.es1568760206mci@n1568760206ozub1568760206