220 research outputs found
Broad band tuning of the plasmonic resonance of gold nanoparticles hosted in self-organized soft materials
No full textThe extraordinary properties of reconfigurable soft materials are used to drive the resonance properties of noble metal nanoparticles, using an approach that puts a bridge between soft matter and plasmonics. Gold nanoparticles have been dissolved in a cholesteric liquid crystal and then infiltrated in a micro-periodic polymeric structure, realized by combining a holographic step and a microfluidic etching process. The spectral behavior of the nano-composite soft-structure has been investigated in the UV-Vis range for two different polarization directions of the impinging probe light. Correlation between the optical response and external perturbations (electric field, temperature variation) gives an outstanding example of broadband tuning of an "active" plasmon resonance. © 2011 The Royal Society of Chemistry
Revisioni e controlli delle liste dei cittadini: la 'diapsephisis' ateniese del 346/5 a.C
No full textControl of the plasmonic resonance of a graphene coated plasmonic nanoparticle array combined with a nematic liquid crystal
No full textWe report on the fabrication and characterization of a switchable plasmonic device based on a conductive graphene oxide (cGO) coated plasmonic nanoparticle (NP) array, layered with nematic liquid crystal (NLC) as an active medium. A monolayer of NPs has been immobilized on a glass substrate through electrostatic interaction, and then grown in place using nanochemistry. This monolayer is then coated with a thin (less then 100nm) cGO film which acts simultaneously as both an electro-conductive and active medium. The combination of the conductive NP array with a separate top cover substrate having both cGO and a standard LC alignment layer is used for aligning a NLC film in a hybrid configuration. The system is analysed in terms of morphological and electro-optical properties. The spectral response of the sample characterized after each element is added (air, cGO, NLC) reveals a red-shift of the localized plasmonic resonance (LPR) frequency of approximately 62nm with respect to the NP array surrounded by air. The application of an external voltage (8Vpp) is suitable to modulate (blue shift) the LPR frequency by approximately 22nm
The Ten Commandments in Old Frisian: Their Form and Content
No full textThis study discusses the relationship amongst the five surviving versions of the Ten Commandments in Old Frisian, which are collectively preserved in eight manuscripts and in one incunable. These versions do not follow the Vulgate text verbatim, but rather include interferences from other texts. As the author intends to show, the compiler of the version of the Ten Commandments in the First Rüstring Manuscript aimed to produce a comprehensive list of precepts by including the Great Commandment, and had a source close to Honorius’s De decem plagis Aegypti spiritualiter at their disposal. The text in Haet is Riocht? may have influenced the vernacular rendition of the Mosaic Law preserved in Codex Aysma. Lastly, the versions preserved in the First and Second Hunsingo Manuscripts and one of the two versions attested by Codex Unia seem to be independent translations of a single Latin text, which survives in Unia
Plasmonic coupling induced by growing processes of metal nanoparticles in wrinkled structures and driven by mechanical strain applied to a polidimethisiloxisilane template
No full textWe report the mechanical control of plasmonic coupling between gold nanoparticles (GNPs) coated onto a large area wrinkled surface of an elastomeric template. Self-assembly and bottom-up procedures, were used to fabricate the sample and to increase the size of GNPs by exploiting the reduction of HAuCl4 with hydroxylamine. The elastic properties of template, the increase of nanostructure size joined with the particular grating configuration of the surface have been exploited to trigger and handle the coupling processes between the nanoparticles. Full Text: PDF ReferencesG. Mie, "Beiträge zur Optik trüber Medien, speziell kolloidaler Metallösungen", Ann. Phys. 25, 377 (1908) CrossRef U. Kreibig and M. Vollmer, Optical properties of metal cluster, Berlin 1995 CrossRef S. A. Maier, Plasmonics: Fundamentals and Applications, Springer, New York, 2007 CrossRef L. A. Lane, X. Qian, and S. Nie, "SERS Nanoparticles in Medicine: From Label-Free Detection to Spectroscopic Tagging", Chem. Rev. 115, 10489-10529 (2015) CrossRef N. Pazos-Perez, W. Ni, A. Schweikart, R. A. Alvarez-Puebla, A. Fery and L. M. Liz-Marzan, "Highly uniform SERS substrates formed by wrinkle-confined drying of gold colloids", Chem. Sci. 1, 174-178P (2010) CrossRef M. Aioub and M. A. El-Sayed, "A Real-Time Surface Enhanced Raman Spectroscopy Study of Plasmonic Photothermal Cell Death Using Targeted Gold Nanoparticles", J. Am. Chem. Soc. 138, 1258-1264 (2016) CrossRef G. Baffou, and R. Quidant, "Thermo-plasmonics: using metallic nanostructures as nano-sources of heat", Laser Photonics Rev. 7, No. 2, 171-187 (2013) CrossRef G. Palermo, U. Cataldi, L. De Sio, T. Beurgi, N. Tabiryan, and C. Umeton, "Optical control of plasmonic heating effects using reversible photo-alignment of nematic liquid crystals", Applied Physics 109, 191906 (2016) CrossRef J. R. Dunklin, G. T. Forcherio, K. R. Berry, Jr., and D. K. Roper, "Gold Nanoparticle Polydimethylsiloxane Thin Films Enhance Thermoplasmonic Dissipation by Internal Reflection", J. Phys. Chem. 118, 7523-7531 (2014) CrossRef Y. Jin, "Engineering Plasmonic Gold Nanostructures and Metamaterials for Biosensing and Nanomedicine", Adv. Mater. 24, 5153-5165 (2012) CrossRef J. H. Lee, Q. Wu, and W. Park, "Metal nanocluster metamaterial fabricated by the colloidal self-assembly", Optics Letters 34, Issue 4, 443-445 (2009) CrossRef R. Pratibha, K. Park, I. I. Smalyukh, and W. Park, "Tunable optical metamaterial based on liquid crystal-gold nanosphere composite", Optics Express 17, Issue 22, 19459-19469 (2009) CrossRef J. Dintinger, S. Mühlig, C. Rockstuhl, and T. Scharf, "A bottom-up approach to fabricate optical metamaterials by self-assembled metallic nanoparticles", Optical Materials Express 2, Issue 3, 269-278 (2012) CrossRef T. Maurer, J. Marae-Djouda, U. Cataldi, A. G., Guillaume Montay, Y. Madi, B. Panicaud, D. Macias, P.-M. Adam, G. Léveque, T. Buergi, and R. Caputo, "The beginnings of plasmomechanics: towards plasmonic strain sensors", Front. Mater. Sci. 9(2) (2015) CrossRef J. N. Anker W. P. Hall, O. Lyandres, N. C. Shah, J. Zhao and R. P. Van Duyne, "Biosensing with plasmonic nanosensors", Nature Materials 7, 442 - 453 (2008) CrossRef M. E. Stewart, C. R. Anderton, L. B. Thompson, J. Maria, S. K. Gray, J. A. Rogers,and R. G. Nuzzo, "Nanostructured Plasmonic Sensors", Chem. Rev. 108, 494-521 (2008) CrossRef P. K. Jain , M. A. El-Sayed, "Plasmonic coupling in noble metal nanostructures", Chemical Physics Letters 487, 153-164 (2010) CrossRef P. K. Jain, W. Huang and M. A. El-Sayed, "On the Universal Scaling Behavior of the Distance Decay of Plasmon Coupling in Metal Nanoparticle Pairs: A Plasmon Ruler Equation", Nano Letters 7, 2080-2088 (2007) CrossRef U. Cataldi, R. Caputo, Y. Kurylyak, G. Klein, M. Chekini, C. Umeton and T. 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Natan, "Hydroxylamine Seeding of Colloidal Au Nanoparticles. 3. Controlled Formation of Conductive Au Films", Chem. Mater. 12, 314 (2000) CrossRef</jats:p
A Study of the Alfredian Verse Prefaces and Epilogues
No full textThis study takes into account the verse prefaces and epilogues associated with the translations of the Alfredian age, approaching them from a metrical standpoint. As I hope to demonstrate, both the Metrical Preface and the Metrical Epilogue to Alfred’s translation of Gregory’s Pastoral Care fit the style of classical Old English poetry. Their author – be it Alfred or one of the scholars that convened at his court – was well-acquainted with the rules governing the traditional alliterative verse. The same applies to the brief Metrical Preface to the Old English Boethius. On the other hand, the Metrical Preface to Wærferth’s translation of Gregory’s Dialogues displays features (such as lack of enjambement and anaphora) that are typical of late Old English poetry. These and other features suggest that this preface might be a late forgery, which was possibly inspired by similar Alfredian examples. This interpretation would fit with the date of the only manuscript where Wærferth’s translation of Gregory’s Dialogues is accompanied by a preface (the eleventh century). The Metrical Epilogue to the translation of Bede’s Ecclesiastical History, which is also preserved in a single, eleventh-century copy, is characterised by the presence of similar features. According to this understanding, the Alfredian prologues and epilogues can be read as examples of the development of Old English poetry from early to late versification
A Re-assessment of Poema Morale and its influence on Penitence for a Wasted Life
No full textThe aim of this study is to re-assess the possible influence of Poema Morale on the slightly later lyric Penitence for Wasted Life. The intention is to consider both the content and metre of the two works. Previous scholarship has noted that Penitence for Wasted Life is thematically close to the early Middle English poem; as I shall show, this debt extends to metre as well. A wise old man’s reflection on the transience of worldly things, Poema Morale displays a fondness for proverbial sayings and vivid descriptions of heaven and hell – all elements that must surely have appealed to the Early Middle English readership. This appeal is attested to not only by the nine manuscripts in which the poem is preserved, but also by several textual borrowings from Poema Morale in a number of thirteenth-century lyrics, which were noted by previous scholarship. In this study, I shall suggest that, amongst these lyrics, Penitence for Wasted Life seems inspired by a specific section of Poema Morale, and that several previously unnoticed metrical correspondences between the two works actually indicate that the author of Penitence for Wasted Life possessed a first-hand knowledge of the twelfth-century poem
Scritti in onore di Ugo Draetta
No full textIl volume contiene una raccolta di scritti in onore del prof. Ugo Draetta, alla quale hanno contribuito autori italiani e stranieri
SOLIDARIETÀ ED EQUITÀ SOCIALE NELL’UNIONE EUROPEA A SETTANT’ANNI DALLA DICHIARAZIONE UNIVERSALE DEI DIRITTI UMANI:IL RUOLO DEI GIUDICI EUROPEI
No full textSeventy years after its proclamation, the Universal Declaration of Human Rights, despite not having a binding force for the states, still provides at international level the fundamental text from which the principles and the values for the preservation of liberty and right of people are taken. In this article, the author particularly underlines the importance of Declaration’s Article 1, which states: “All human beings are born free and equal in dignity and rights”. With these words the Declaration presses states to undertake economic policies aimed at achieving economic and social progress for all individuals. Unfortunately, we also have to underline the lack of effective social policies in government programs of the E.U. Member States. The author inquires whether it is left to European judges to affirm the importance of social welfare
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