Search results for "gold"
showing 10 items of 1320 documents
Toward Single Electron Nanoelectronics Using Self-Assembled DNA Structure
2016
DNA based structures offer an adaptable and robust way to develop customized nanostructures for various purposes in bionanotechnology. One main aim in this field is to develop a DNA nanobreadboard for a controllable attachment of nanoparticles or biomolecules to form specific nanoelectronic devices. Here we conjugate three gold nanoparticles on a defined size TX-tile assembly into a linear pattern to form nanometer scale isolated islands that could be utilized in a room temperature single electron transistor. To demonstrate this, conjugated structures were trapped using dielectrophoresis for current-voltage characterization. After trapping only high resistance behavior was observed. However…
Covalently Conjugated Gold-Porphyrin Nanostructures
2020
Gold nanoparticles show important electronic and optical properties, owing to their size, shape, and electronic structures. Indeed, gold nanoparticles containing no more than 30&ndash
Coupling chemical reaction to electrospray: a novel preparation of gold nanostructures
2014
The simultaneous reduction of Au(III) to Au(0), synthesis of gold nanoparticles and their deposition onto boron-doped silicon target have been attained by the electrospray technique. In this way the overall process can be considered as a novel chemical/physical hybrid method which synergically exploits the merits of both approaches. Various experimental conditions have been explored to optimize the process: it has been found that, by applying a negative high voltage to the boron-doped silicon target and with the presence of the surfactant Bis(2-ethylhexyl)sulfosuccinate sodium salt in the solution, a quantitative transformation of Au(III) to Au(0) nanoparticles has been obtained. The deposi…
Surface Coordination of Multiple Ligands Endows N‐Heterocyclic Carbene‐Stabilized Gold Nanoclusters with High Robustness and Surface Reactivity
2020
Deciphering the molecular pictures of the multi-component and non-periodic organic-inorganic interlayer is a grand technical challenge. Here we show that the atomic arrangement of hybrid surface ligands on metal nanoparticles can be precisely quantified through comprehensive characterization of a novel gold cluster, Au 44 ( i Pr 2 -bimy) 9 (PA) 6 Br 8 , which features three types of ligands, namely, carbene (1,3-diisopropylbenzimidazolin-2-ylidene, i Pr 2 -bimy), alkynyl (phenylacetylide, PA), and halide (Br), respectively. The delicately balanced stereochemical effects and bonding capabilities of the three ligands give rise to peculiar geometrical and electronic structures. Remarkably, des…
Hybrid aerosol assisted atmospheric pressure Chemical Vapour Deposition: a facile route toward nano-composite thin films?
2009
A hybrid chemical vapour deposition strategy is presented as a facile route for the production of vanadium dioxide nano-composite thin films. The effect of the inclusion of gold nano-particles and the use of a surfactant molecule; tetraoctylammonium bromide (TOAB), is discussed. The films are fully characterised and it is shown that micro-structural changes lead to an enhancement of thermochromic properties, whilst gold nano-particles lead to a change in the films optical properties. Optical data is used in energy modelling studies to elucidate the films potential as an energy saving coating in architectural glazing.
In vivo efficacy of verteporfin loaded gold nanorods for combined photothermal/photodynamic colon cancer therapy.
2022
The high incidence of cancer recurrences and the frequent occurrence of multidrug resistance often stem from a poorly selective and inefficient antineoplastic therapy, responsible for the onset of undesired side effects as well. A combination of minimal-invasive approaches could thus be a useful strategy to surmount these shortcomings, achieving a safe and solid cancer therapy. Herein, a multi-therapeutic nanotool was designed by merging the photothermal properties of gold nanorods (AuNRs) with the photodynamic activity of the photosensitizer ver-teporfin. AuNRs were coated with the natural materials lipoic acid and gellan gum (AuNRs_LA,GG) and subse-quently loaded with verteporfin (AuNRs_L…
Riflessioni sull’apporto artistico degli orafi e argentieri napoletani a Malta nel Seicento
2019
The article deals with master goldsmiths and silversmiths from Naples looking for luck in Malta during the seventeenth century.
A systematic review of animal models for experimental neuroma
2015
Summary Peripheral neuromas can result in an unbearable neuropathic pain and functional impairment. Their treatment is still challenging, and their optimal management is to be defined. Experimental research still plays a major role, but - although numerous neuroma models have been proposed on different animals - there is still no single model recognised as being the reference. Several models show advantages over the others in specific aspects of neuroma physiopathology, prevention or treatment, making it unlikely that a single model could be of reference. A reproducible and standardised model of peripheral neuroma would allow better comparison of results from different studies. We present a…
A Quantitative In Vitro Approach to Study the Intracellular Fate of Gold Nanoparticles: From Synthesis to Cytotoxicity
2009
Due to their physico-chemical characteristics, gold nanoparticles (AuNPs) seem to be suitable for biomedical and therapeutic applications even if conflicting data on their toxicological profiles are present in literature. In order to better understand if AuNPs could be safe we must consider different biological endpoints such as cytotoxicity, genotoxicity, inflammation and biopersistence. Starting from these considerations, one of the first issues to be assessed is to better understand if AuNPs can be internalized by cells. In this work, we propose a methodological approach to radioactivate AuNPs by neutron activation and the quantification of their internalization by two in vitro cell syst…
Copiste et créateur : les paradoxes de l'écrivain romantique
2015
International audience; L’article analyse deux célèbres figures de copistes romantiques, celle d'Anselme, le héros du Vase d'or de Hoffmann (1814), et celle d'Akaki Akakiévitch, le héros du Manteau de Gogol (1843). Il s’interroge sur le rapport entre copie et création à l’époque romantique.