Search results for " Gold"
showing 10 items of 278 documents
La mirada como espejo: diálogos entre Diane Arbus y Nan Goldin
2013
Las instantáneas de Diane Arbus y Nan Goldin no han dejado indiferente a ninguna generación desde sus primeros pasos en la disciplina. Su mención en antologías o historias generales de la fotografía constituye actualmente un compromiso ineludible como hitos de un género fronterizo entre lo artístico y lo documental. Sus figuras y su producción han sido objeto de monografías, estudios críticos, biografías, documentales, filmes y exposiciones en todo el mundo. Hasta el momento, la literatura artística ha conectado sistemáticamente la obra de ambas, sin embargo, no se ha llevado a cabo un análisis íntegro de sus analogías y diferencias. El presente Trabajo Final de Máster ofrece un estudio rel…
Insights into the catalytic production of hydrogen from propane in the presence of oxygen: Cooperative presence of vanadium and gold catalysts
2015
7 figures.-- © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Ostensori architettonici in Sicilia tra suggestioni iberiche e rinascimentali
2022
Through the analysis of six architectural monstrances housed in churches and museums in Sicily, the formal and compositional languages that, between Iberian and Renaissance suggestions, characterize these masterpieces of sacred art are analyzed. They are small silver architectures, produced between the fifteenth and seventeenth centuries, which are influenced by the Catalan Gothic influences and the Italian Renaissance, in a peculiar Sicilian synthesis.
ZnO Nanowires catalytic solution growth for piezotronic and bio-applications
2016
Photocatalytic activity of N-doped TiO2-based materials embedded with gold NPs for applications in antibacterial photodynamic therapy (aPDT)
Antibacterial photodynamic therapy (aPDT) is a potential treatment for antibiotic-resistant bacterial infections. It is based on the photosensitization of bacterial cells with exogenous agents that, when exposed to light, produce reactive oxygen species (ROS), such as OH-, O2-, H2O2. ROS can induce complex oxidative-reductive chains of reactions, resulting in damage of cellular components in target tissues1. Photocatalysts, like inorganic semiconductor oxides, represent an interesting class of materials to design new strategies for aPTD. As exposed to light of proper wavelengths, photocatalysts induce the formation of electron-hole pairs capable of producing a cascade of reactions suitable …
Bene ordinata et eleganter picta. Kościół św. Jerzego w Gliwicach-Ostropie (1667-1719-2019). Monografia wydana z okazji 350. rocznicy budowy kościoła…
2019
Wieloautorska monografia, pod naukową redakcją ks. Piotra Góreckiego, powstała z okazji 350. rocznicy budowy murowano-drewnianego kościoła pw. św. Jerzego w Gliwicach-Ostropie oraz 300. rocznicy jego poświęcenia. Pod koniec prowadzonego przez ponad 10 lat kapitalnego remontu zdecydowano się, aby pozostawić trwały ślad nie tylko w strukturze zabytkowej odrestaurowanej budowli, ale także aby opublikować monografię książkową, zbierającą w jedną całość dotychczasową wiedzę o tym zabytkowym kościele: jego przeszłości i aktualnym stanie, jego historycznej konstrukcji i przechowywanej w nim lub też w Muzeum Diecezjalnym w Opolu zabytkowej substancji. Do napisania poszczególnych rozdziałów zaproszo…
Experimental observation of Electronic Metal support interaction: investigation of Au/Ceria catalysts by HERFD–XANES
2015
In this paper we report the result of a recent experiment of high resolution XANES (HERFD-XANES) which evidenced this modification suggesting that gold clusters with very similar size can have a modified electronic structure (the empty d-Density-of-states) when they are deposited on ceria and titania oxide
Controlled UV-C light-induced fusion of thiol-passivated gold nanoparticles.
2011
Thiol-passivated gold nanoparticles (AuNPs) of a relatively small size, either decorated with chromophoric groups, such as a phthalimide (Au@PH) and benzophenone (Au@BP), or capped with octadecanethiol (Au@ODCN) have been synthesized and characterized by NMR and UV-vis spectroscopy as well as transmission electron microscopy (TEM). These NPs were irradiated in chloroform at different UV-wavelengths using either a nanosecond laser (266 and 355 nm, ca. 12 mJ/pulse, 10 ns pulse) or conventional lamps (300 nmλ400 nm and ca. 240 nmλ280 nm) and the new AuNPs were characterized by X-ray and UV-vis spectroscopy, as well as by TEM. Laser irradiation at 355 nm led to NP aggregation and precipitation,…
Role of pH in the synthesis and growth of gold nanoparticles using L-asparagine: a combined experimental and simulation study
2020
Abstract The use of biomolecules as capping and reducing agents in the synthesis of metallic nanoparticles constitutes a promising framework to achieve desired functional properties with minimal toxicity. The system’s complexity and the large number of variables involved represent a challenge for theoretical and experimental investigations aiming at devising precise synthesis protocols. In this work, we use L-asparagine (Asn), an amino acid building block of large biomolecular systems, to synthesise gold nanoparticles (AuNPs) in aqueous solution at controlled pH. The use of Asn offers a primary system that allows us to understand the role of biomolecules in synthesising metallic nanoparticl…
Atomistic Simulations of Functional Au_{144}(SR)_{60} Gold Nanoparticles in Aqueous Environment
2012
Charged monolayer-protected gold nanoparticles (AuNPs) have been studied in aqueous solution by performing atomistic molecular dynamics simulations at physiological temperature (310 K). Particular attention has been paid to electrostatic properties that modulate the formation of a complex comprised of the nanoparticle together with surrounding ions and water. We focus on Au-144 nanoparticles that comprise a nearly spherical Au core (diameter similar to 2 nm), a passivating Au-S interface, and functionalized alkanethiol chains. Cationic and anionic AuNPs have been modeled with amine and carboxyl terminal groups and Cl-/Na+ counterions, respectively. The radial distribution functions show tha…