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Choi, E. Y.,Mazur, L.,Mager, L.,Gwon, M.,Pitrat, D.,Mulatier, J. C.,Monnereau, C.,Fort, A.,Attias, A. J.,Dorkenoo, K.,Kwon, J. E.,Xiao, Y.,Matczyszyn, K.,Samoc, M.,Kim, D.-W.,Nakao, A.,Heinrich, B.,Ha The Royal Society of Chemistry 2014 Physical chemistry chemical physics Vol.16 No.32
<P>We investigate the photophysical and amplified spontaneous emission properties of a series of monodisperse solution-processable oligofluorenes functionalized with hexyl chains at the C9 position of each fluorene unit. Thin films of these oligofluorenes are then used in organic field-effect transistors and their charge transport properties are examined. We have particularly focused our attention on the influence of oligofluorene length on the absorption and steady-state fluorescence spectra, on the HOMO/LUMO energy levels, on the photoluminescence lifetime and quantum yield as well as on the amplified spontaneous emission properties and the charge carrier mobilities. Differential scanning calorimetry and X-ray diffraction measurements demonstrate that, among all oligofluorene derivatives used in this study, only the structure and morphology of the pentafluorene film is significantly modified by a thermal treatment above the glass transition temperature, resulting in a 9 nm blue-shift of the fluorescence spectrum without significant changes in the photoluminescence quantum yield and in the amplified spontaneous emission threshold. In parallel, hole field-effect mobility is significantly increased from 8.6 × 10<SUP>−7</SUP> to 3.8 × 10<SUP>−5</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> upon thermal treatment, due to an increase of crystallinity. This study provides useful insights into the morphological control of oligofluorene thin films and how it affects their photophysical and charge transport properties. Moreover, we provide evidence that, because of the low threshold, the tunability of the amplified spontaneous emission and the photostability of the films, these oligofluorenes are promising candidates for organic solid-state laser applications.</P> <P>Graphic Abstract</P><P>We investigate the charge transport, photophysical and amplified spontaneous emission properties of a series of monodisperse solution-processable oligofluorenes functionalized with hexyl chains at the C9 position of each fluorene unit. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cp01134a'> </P>
이종득(Lee Chong-Duk),심재범(Shim Jae-Bum),마거 울프디트리히(Mager Wulfdietrich),한광모(Han Kwang Mo) 한국철도학회 2001 한국철도학회 학술발표대회논문집 Vol.- No.-
Conventional Korean tunnel portals require a lot of overburden as, for static reasons, about 1.5 to 2.0 times the tunnel diameter is needed for the height in order to achieve a sufficient arching effect. Thus, considerable movement of earth and support constructions are required which lead to undesirably large changes of and damage to the environment. With a massively designed pipe roof, tunnels with little overburden can be built. For the effective construction of a pipe roof as an advancing safeguarding method, the following properties are indispensable: stability, insensitivity to settling and drilling accuracy. With the AT casing system a new pipe roof method has been developed which on the one hand entirely combines the properties mentioned last, and which on the other hand permits safe, economical and environmentally friendly construction of tunnels at low overburden heights of 3 to 6 m.
An in vitro Study on the Biocompatibility of Titanium Implants Made by Selective Laser Melting
Aranka Ilea,Daniela Timuș,Nausica Bianca Petrescu,Olga Sorițău,Bianca Adina Boșca,Voicu Mager,Lucian Barbu-Tudoran,Anida Maria Băbțan,Radu Septimiu Câmpian,Réka Barabás 한국생물공학회 2019 Biotechnology and Bioprocess Engineering Vol.24 No.5
Customized medical implants obtained by selective laser melting have an important applicability due the accurate architecture which promotes the osteointegration, osteoconduction, and osteoinduction. This study assessed the in vitro effect of titanium scaffolds, both pure and covered with a layer of hydroxyapatite, on mesenchymal stem cells harvested from various oral tissues. Eight titanium implants were manufactured by selective laser melting, obtaining a porosity of 63.4% and a pore size of 600 μm. Four matrices were covered with nano-hydroxyapatite. Four lines of mesenchymal stem cells isolated from the apical papilla, the dental pulp, the inter-radicular bone, and the tuberosity bone were seeded on the implants. The cells’ proliferation, viability, and differentiation into the osteoblastic lineage were assessed after 18 days, using light microscopy and fluorescence. Our results indicated that the titanium matrices did not exert cytotoxic effect. The cells seeded on titanium matrices conditioned with nanohydroxyapatite had a slightly higher proliferation rate. The stem cells isolated from the inter-radicular bone had the most intense proliferation and differentiation towards the osteoblastic lineage showing a nodular architecture. In conclusion, the oral mesenchymal stem cells have the potential to promote and improve bone regeneration when associated with the titanium scaffolds manufactured by selective laser melting, either non-coated or coated with hydroxyapatite. These findings open new perspectives for the bone reconstruction in the oral and maxillofacial surgery field.
Lee, K. J.,Woo, J. H.,Kim, E.,Xiao, Y.,Su, X.,Mazur, L. M.,Attias, A.-J.,Fages, F.,Cregut, O.,Barsella, A.,Mathevet, F.,Mager, L.,Wu, J. W.,D'Alé,o, A.,Ribierre, J.-C. The Royal Society of Chemistry 2016 Physical chemistry chemical physics Vol.18 No.11
<P>We investigate the photophysical properties of organic donor-acceptor dyad and triad molecular systems based on triphenylene and perylene diimide units linked by a non-conjugated flexible bridge in solution using complementary optical spectroscopy techniques. When these molecules are diluted in dichloromethane solution, energy transfer from the triphenylene to the perylene diimide excited moieties is evidenced by time-resolved fluorescence measurements resulting in a quenching of the emission from the triphenylene moieties. Simultaneously, another quenching process that affects the emission from both donor and acceptor units is observed. Solution ultrafast transient absorption measurements provide evidence of photo-induced charge transfer from either the donor or the acceptor depending upon the excitation. Overall, the analysis of the detailed time-resolved spectroscopic measurements carried out in the dyad and triad systems as well as in the triphenylene and perylene diimide units alone provides useful information both to better understand the relations between energy and charge transfer processes with molecular structures, and for the design of future functional dyad and triad architectures based on donor and acceptor moieties for organic optoelectronic applications.</P>