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RISS 인기검색어
- 검색키워드
- 저자 : Piret, Gaë (검색결과 3 건)
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Silica colloidal crystals with uni- and multi-photonic bandgaps and controlled reflective properties
Piret, F.,Kwon, Y.-U.,Su, B.-L. Elsevier 2009 Chemical physics letters Vol.472 No.4
<P><B>Graphical abstract</B></P><P>The present Letter introduces a new concept in the field of 3D photonic crystals, for the first time, we prepared the 3D silica colloidal crystals containing multi-photonic bandgaps. This is achieved by creating multiple layer structures of two (or more) colloidal crystals with different lattice parameters. Each layer will diffract lights of its characteristic wavelength and the reflectance spectra are expected to present as many reflectance peaks as the number of layers.</P><ce:figure></ce:figure> <P><B>Abstract</B></P><P>High quality silica colloidal crystals with one or multi-photonic bandgaps that can be controlled in the whole range of the visible and near infrared lights have been designed. A comprehensive set of parameters that can predetermine the particle sizes from 150 to 750nm of the resulting silica colloids and their polydispersities was established. Self-assembly of such silica spheres produced highly organized colloidal crystals, leading to the photonic crystals of which the reflectance wavelengths can cover the whole range of visible lights and parts of the ultraviolet and infrared lights. Multiple deposition of silica spheres of two or more different sizes produced a heterostructured with multiple photonic bandgaps.</P>
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Piret, Gaë,lle,Kim, Doohun,Drobecq, Hervé,Coffinier, Yannick,Melnyk, Oleg,Schmuki, Patrik,Boukherroub, Rabah The Royal Society of Chemistry 2012 The Analyst Vol.137 No.13
<P>The paper reports on the use of a titanium oxide (TiO<SUB>2</SUB>) nanotube layer as a sensitive substrate for surface-assisted laser desorption–ionization mass spectrometry (SALDI-MS) of peptides and small molecules. The nanotube layers were prepared by electrochemical anodization of titanium foil. The optimized TiO<SUB>2</SUB> nanotubes morphology coupled to a controlled surface chemistry allowed desorption–ionization (D/I) of a peptide mixture (Mix1) with a detection limit of 10 femtomoles for the neurotensin peptide. The performance of the TiO<SUB>2</SUB> nanotubes for the D/I of small molecules was also tested for the detection of sutent, a small tyrosine kinase inhibitor, and verapamil. A detection limit of 50 fmol was obtained for these molecules, as compared to 500 fmol using classical matrix-assisted laser desorption–ionization mass spectrometry (MALDI-MS). Both amorphous and anatase TiO<SUB>2</SUB> layers displayed a comparable performance for D/I of analyte molecules. In a control experiment, we have performed D/I of analyte molecules on a flat TiO<SUB>2</SUB> layer. The absence of signal emphasizes the role of the nanostructured substrate in the D/I process.</P> <P>Graphic Abstract</P><P>The paper reports the use of a titanium oxide (TiO<SUB>2</SUB>) nanotube layer as a sensitive substrate for surface-assisted laser desorption–ionization mass spectrometry (SALDI-MS) of peptides and small molecules. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2an35207a'> </P>
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