Search results for: Alexandros Selimis

Items from 1 to 12 out of 12 results

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Initiator‐Free, Multiphoton Polymerization of Gelatin Methacrylamide

Kostas Parkatzidis, Elmina Kabouraki, Alexandros Selimis, Maria Kaliva, more

Macromolecular Materials and Engineering > 303 > 12 > n/a - n/a

Multiphoton lithography (MPL), based on multiphoton polymerization (MPP), is a powerful technique for the fabrication of 3D structures used in tissue engineering and other biomedical applications, microoptics, nanophotonics, micro‐/nanomechanics, and micro‐/nanofluidics. MPL is based on the localized polymerization/cross‐linking of photosensitive materials induced by femtosecond laser pulses. The...

article

3D patterning of ZnO nanostructures

Argyro N. Giakoumaki, George Kenanakis, Argyro Klini, Maria Androulidaki, more

Materials Today > 2017 > 20 > 7 > 392-393

article

Direct laser writing: Principles and materials for scaffold 3D printing

Alexandros Selimis, Vladimir Mironov, Maria Farsari

Microelectronic Engineering > 2015 > 132 > C > 83-89

For a great variety of research fields extending from photonics to tissue engineering applications, the requests for the construction of three-dimensional structures with high resolution grow more and more imperative. Towards this aim, the direct laser writing technique by multi-photon polymerization, due to its unique properties and characteristics, has proven to be an indispensable tool to high...

article

Effect of pulse duration on KrF laser treatment of a polyethersulfone film: cell culture study

Hedieh Pazokian, Mahmoud Mollabashi, Alexandros Selimis, Emmanuel Stratakis, more

Applied Physics A > 2013 > 110 > 3 > 633-637

KrF laser processing of polyethersulfone (PES) films at three different pulse durations regarding to the change in biocompatibility is presented with cell culture study. Various microstructure and chemistry results were obtained on the surface upon laser irradiation. It is shown that nanoscale hydrophilic ripples significantly affect the adhesion of L929 cells on the surface.

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Fabrication of porous biopolymer substrates for cell growth by UV laser: The role of pulse duration

Marta Castillejo, Esther Rebollar, Mohamed Oujja, Mikel Sanz, more

Applied Surface Science > 2012 > 258 > 22 > 8919-8927

Ultraviolet laser irradiation using pulses with duration from the nanosecond to the femtosecond range was investigated aiming at the generation of a foam layer on films of the biopolymers chitosan, starch and their blend. We report on the morphological characteristics of the foams obtained upon irradiation and on the accompanying laser induced photochemistry, assessed by on line monitoring of the...

article

KrF laser ablation of a polyethersulfone film: Effect of pulse duration on structure formation

Hedieh Pazokian, Alexandros Selimis, Emmanuel Stratakis, Mahmoud Mollabashi, more

Applied Surface Science > 2011 > 258 > 1 > 169-175

Polyethersulfone (PES) films were processed with KrF laser irradiation of different pulse durations (τ). Scanning electron microscopy (SEM) and Raman spectroscopy were employed for the examination of the morphology and chemical composition of the irradiated surfaces, respectively. During ablation with 500fs and 5ps pulses, localized deformations (beads), micro-ripple and conical structures were observed...

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Laser‐Induced Cell Detachment and Patterning with Photodegradable Polymer Substrates

George Pasparakis, Theodore Manouras, Alexandros Selimis, Maria Vamvakaki, more

Angewandte Chemie > 123 > 18 > 4228 - 4231

Schon durch Photolyse mit niedrigen Energien werden die Hauptketten von Polymeren gespalten, die zu effizienten Substraten für die sichere Abtrennung und Musterbildung von Zellen mithilfe von Laserlicht entwickelt wurden. Die Polymere, die neben Acetal‐ oder Ketaleinheiten auch absorbierende Gruppen im Rückgrat enthalten, zersetzen sich bei der Bestrahlung mit einem Excimer‐Laser schnell, wodurch...

article

Laser‐Induced Cell Detachment and Patterning with Photodegradable Polymer Substrates

George Pasparakis, Theodore Manouras, Alexandros Selimis, Maria Vamvakaki, more

Angewandte Chemie International Edition > 50 > 18 > 4142 - 4145

A glimpse of light is all it takes: Polymers that undergo main‐chain scission at remarkably low photolysis energies were developed as efficient photodegradable substrates for safe laser‐mediated cell detachment and patterning. The polymers, which contain acetal or ketal units in their backbone along with suitable absorbing groups, underwent fast degradation to release live cells upon irradiation with...

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Recent Studies of Laser Science in Paintings Conservation and Research

Paraskevi Pouli, Alexandros Selimis, Savas Georgiou, Costas Fotakis

Accounts of Chemical Research > 2010 > 43 > 6 > 771 - 781

article

The use of model probes for assessing in depth modifications induced during laser cleaning of modern paintings

Panagiota Vounisiou, Alexandros Selimis, George J. Tserevelakis, Kristalia Melessanaki, more

Applied Physics A > 2010 > 100 > 3 > 647-652

The cleaning of over-paint layers is a usual requirement to be met in the conservation of modern paintings. In most cases, acrylics or other related compounds must be removed without affecting the original painting. The elucidation of the extent of any photochemical or structural modification induced to the substrate following laser irradiation is a crucial challenge for the broader implementation...

article

Nanosecond and femtosecond UV laser ablation of polymers: Influence of molecular weight

Irina-Alexandra Paun, Alexandros Selimis, Giannis Bounos, Gabriella Kecskeméti, more

Applied Surface Science > 2009 > 255 > 24 > 9856-9860

We examine the nanosecond and femtosecond UV laser ablation of poly(methyl methacrylate) (PMMA) as a function of molecular weight (M _w ). For laser ablation with nanosecond laser pulses, at the excimer wavelengths 248nm and 193nm, we show that high temperatures develop; yet the dynamics of material ejection differs depending on polymer M _w . The results on the nanosecond ablation of...

article

Examination of the influence of molecular weight on polymer laser ablation: polystyrene at 248 nm

Esther Rebollar, Giannis Bounos, Alexandros Selimis, Marta Castillejo, more

Applied Physics A > 2008 > 92 > 4 > 1043-1046

Following previous studies on the influence of the polymer molecular weight (M_W) on the ablation of poly(methyl methacrylate) (PMMA) at 248 nm, this work extends the examination to the ablation of polystyrene (PS) at 248 nm. The ablation threshold and the etching rates are found to be nearly independent of M_W. Optical microscopy demonstrates an excellent crater morphology, few small bubbles are formed...

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