Activiteit
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Shout out to Cell Press/Elsevier as an employer… for the conference tomorrow I was trying to figure out childcare and learned that as an employee…
Shout out to Cell Press/Elsevier as an employer… for the conference tomorrow I was trying to figure out childcare and learned that as an employee…
Gemarkeerd als interessant door Ilaria Cianchetta
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Let me start with what keeps me smiling all day and likely a few days more; I did it! I completed my first sprint triathlon! And yes it was hard at…
Let me start with what keeps me smiling all day and likely a few days more; I did it! I completed my first sprint triathlon! And yes it was hard at…
Gemarkeerd als interessant door Ilaria Cianchetta
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È stata assegnata a Roberta Sessoli, professoressa di Chimica Generale ed Inorganica all'Università degli Studi di Firenze e afferente INSTM -…
È stata assegnata a Roberta Sessoli, professoressa di Chimica Generale ed Inorganica all'Università degli Studi di Firenze e afferente INSTM -…
Gemarkeerd als interessant door Ilaria Cianchetta
Ervaring en opleidingen
Publicaties
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Can a metal nanoparticles based catalyst drive the selective growth of bright SiV color centers in CVD diamonds?
Journal of Material Chemistry C
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Discoloration of the smalt pigment: experimental studies and ab initio calculations
J. Anal. At. Spectrom.
Smalt is a blue pigment used by many European artists in mural and easel paintings, mainly in the period from the XV to XVIII century. It is a potassium glass where cobalt is added to the glassy matrix to get the blue hue. The pigment deteriorates with age, changing its colour from an intense blue to a grey-yellowish hue, causing severe problems in the conservation of the paintings. In this study a set of specimens of smalt dispersed in linseed oil was prepared and artificially aged to simulate…
Smalt is a blue pigment used by many European artists in mural and easel paintings, mainly in the period from the XV to XVIII century. It is a potassium glass where cobalt is added to the glassy matrix to get the blue hue. The pigment deteriorates with age, changing its colour from an intense blue to a grey-yellowish hue, causing severe problems in the conservation of the paintings. In this study a set of specimens of smalt dispersed in linseed oil was prepared and artificially aged to simulate the progressive deterioration of the pigment in a painting on canvas. The artificially aged smalt specimens were compared with some samples of naturally aged smalt taken from a banner painted at the end of XV century by Luca Signorelli, the “Baptism of Jesus”. A multi-technique approach, including SEM-EDX, spectro-colorimetry, X-ray absorption spectroscopy and ab initio calculations, was used to understand the progressive discoloration and to reveal its correlation with changes occurring in the pigment structure.
Andere auteurs -
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Effects of Au nanoparticles on photoluminescence emission from Si-vacancy in diamond
Chemical Physics Letters
We studied the coupling of diamond Si color centers with size-controlled Au nanoparticles obtained by chemical routes. The diamond samples, synthesized by Chemical Vapor Deposition, were polycrystalline films or isolated grains. The plasmonic responses of the Au nanoparticles were found to couple with the Ar+ laser frequency or with the frequency of the Si-defects photoluminescence (PL). When the PL of Si optical centers is resonant with the maximum of the Au extinction spectrum, a threshold…
We studied the coupling of diamond Si color centers with size-controlled Au nanoparticles obtained by chemical routes. The diamond samples, synthesized by Chemical Vapor Deposition, were polycrystalline films or isolated grains. The plasmonic responses of the Au nanoparticles were found to couple with the Ar+ laser frequency or with the frequency of the Si-defects photoluminescence (PL). When the PL of Si optical centers is resonant with the maximum of the Au extinction spectrum, a threshold behavior and a decrease of the PL band FWHM with increasing laser energy is detected, suggesting the transition from spontaneous to stimulated emission.
Andere auteursPublicatie weergeven -
Evidence for an unorthodox firing sequence employed by the Berlin Painter: deciphering ancient ceramic firing conditions through high-resolution material characterization and replication
J. Anal. At. Spectrom.
XANES spectroscopy was used to complement the results previously obtained with Raman spectroscopy by the same group to determine the firing conditions used in the production of a single vessel painted by the Berlin Painter in the 5th century B.C. The vessel, part of the collection of the J. Paul Getty Museum, presents a complicated layered architecture of black and red gloss, with different stratigraphies present on the interior and exterior surfaces. The study of two samples, one each from the…
XANES spectroscopy was used to complement the results previously obtained with Raman spectroscopy by the same group to determine the firing conditions used in the production of a single vessel painted by the Berlin Painter in the 5th century B.C. The vessel, part of the collection of the J. Paul Getty Museum, presents a complicated layered architecture of black and red gloss, with different stratigraphies present on the interior and exterior surfaces. The study of two samples, one each from the interior and exterior surface of the vessel, was performed with the complementary analytical techniques of X-ray nano- and micro-spectroscopy (X-ray fluorescence spectroscopy (XRF) and full-field transmission X-ray micro-spectroscopy (FF-XANES) across the Fe K edge), and supported by a replication study. The replicates, made in a laboratory furnace providing complete control over the firing temperature and oxygen partial pressure, provided a paradigm for the comparison of the mineralogical phases observed in the ancient samples, which led to a deeper understanding of the firing conditions necessary for the production of the Berlin Painter's vessel. Our results confirm the necessity of multiple firings and painting applications to obtain the Berlin Painter's architecture and provide a further example of the multiplicity of techniques and practices employed by the potters of the Kerameikos in ancient Athens.
Andere auteursPublicatie weergeven -
Investigating the firing protocol of Athenian pottery production: A Raman study of replicate and ancient sherds
Journal of Raman Spectroscopy
The black and red coloration of ancient Athenian pottery is due to the different oxidation states of iron oxide: reduced Fe2+ (black) and oxidized Fe3+ (red). It has long been thought that a single, three-step firing — oxidation–reduction–oxidation — was used to manipulate the Fe valence state and achieve different degrees of vitrification between the slip and the body to produce the high contrast black and red images. However, complex and layered structures, with slips of different color…
The black and red coloration of ancient Athenian pottery is due to the different oxidation states of iron oxide: reduced Fe2+ (black) and oxidized Fe3+ (red). It has long been thought that a single, three-step firing — oxidation–reduction–oxidation — was used to manipulate the Fe valence state and achieve different degrees of vitrification between the slip and the body to produce the high contrast black and red images. However, complex and layered structures, with slips of different color overlaying each other, are sometimes found, raising the question of the adequacy of a single three-step firing to produce complex architectures. The firing conditions used in the production of an ancient vessel in the collection of the J. Paul Getty Museum, in which a red glossy layer is found between the black gloss and the body, were investigated. The ancient specimen was compared to a set of replicates produced and fired under a series of controlled temperatures and oxygen fugacities. Raman spectroscopy was used to identify the mineralogical phases present in both the ancient and the replicate samples, and the shape and position of the Eg mode in hematite provided a measure of the temperatures at which the minerals were formed. The results suggest the ancient vessel was produced using at least two separate firings: a high temperature firing under oxidizing conditions to create the underlying red glossy layer, followed by a three-step firing to create the surface black gloss decoration. This finding suggests the firing of ancient Athenian pottery was more complex than previously thought
Andere auteursPublicatie weergeven -
One-Step Growth and Shaping by a Dual-Plasma Reactor of Diamond Nanocones Arrays for the Assembling of Stable Cold Cathodes
Nanoscience and Nanotechnology Letters
Arrays of conical-shaped nanodiamond structures are formed on silicon substrate by a single-step CVD process from CH4/H2 mixtures. The formation of these nanocones has been found to depend on interplay between growing and etching during the CVD process carried out in a dual-mode MW/RF plasma reactor. Morphology and structure of the conical-like systems can be controlled by varying the process parameters, and have been investigated by scanning electron microscopy (SEM), reflection high energy…
Arrays of conical-shaped nanodiamond structures are formed on silicon substrate by a single-step CVD process from CH4/H2 mixtures. The formation of these nanocones has been found to depend on interplay between growing and etching during the CVD process carried out in a dual-mode MW/RF plasma reactor. Morphology and structure of the conical-like systems can be controlled by varying the process parameters, and have been investigated by scanning electron microscopy (SEM), reflection high energy electron diffraction (RHEED) and micro-Raman spectroscopy. The Field Emission (FE) properties of different diamond nanocones arrays have been investigated and compared with those of analogous systems in order to assess the feasibility of the present nanomaterials as electron emitters for cold cathodes. The FE behavior is discussed taking into account the structure of the different diamond nanocones.
Andere auteursPublicatie weergeven -
Zn in Athenian Black Gloss Ceramic Slips: A Trace Element Marker for Fabrication Technology
Journal of the American Ceramic Society
The black-colored pottery slips produced in Athens from the 6th to 4th centuries B.C., had a consistent composition achieved through processing and refinement of raw clay. Little direct evidence has been established as to what were these refinement methods. To better understand how the slip material was prepared, the major and trace elemental compositions of 19 slips from different ceramic vessels and their corresponding bodies of Athenian red-figure and black-figure vases were determined using…
The black-colored pottery slips produced in Athens from the 6th to 4th centuries B.C., had a consistent composition achieved through processing and refinement of raw clay. Little direct evidence has been established as to what were these refinement methods. To better understand how the slip material was prepared, the major and trace elemental compositions of 19 slips from different ceramic vessels and their corresponding bodies of Athenian red-figure and black-figure vases were determined using laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). Notably higher Zn concentrations were found in the slips (271–1959 ppm) than in their corresponding body ceramics (<361 ppm). The Zn concentrations in the slips were also found to be above the natural background for typical clay (between 10 and 300 ppm) suggesting an unintentional anthropogenic enrichment of this metal. Based on the abnormally high Zn content of the slip, it is speculated that the clay was treated using vitriol (concentrated acid mine runoff which is rich in Zn), to induce flocculation and remove carbonate mineral phases from the raw material that, if present, would prevent the slip from vitrifying. This same signature of elevated levels of Zn with a corresponding Ce anomaly is also observed for black glosses produced in Corinthian and Etrurian (Italy) workshops indicating that these trace element signatures were imparted to the material by means of shared methods of manufacturing instead of being indicative of a single unique source for this material.
Andere auteursPublicatie weergeven
Talen
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Italiano
Moedertaal of tweetalig
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Inglese
Volledige professionele vaardigheid
Meer activiteiten van Ilaria
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It has been an incredible pleasure and exciting moment in Boston this week. Glad for the connections done. Great minds, exciting discussions. Science…
It has been an incredible pleasure and exciting moment in Boston this week. Glad for the connections done. Great minds, exciting discussions. Science…
Gemarkeerd als interessant door Ilaria Cianchetta
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The June issue of Device is online now, featuring a Focus on Virtual & Augmented Reality devices led by Senior Editor 姚遠Yuen Yiu! Link to the whole…
The June issue of Device is online now, featuring a Focus on Virtual & Augmented Reality devices led by Senior Editor 姚遠Yuen Yiu! Link to the whole…
Gemarkeerd als interessant door Ilaria Cianchetta
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When I was writing my opinion article on (the lack of) readiness of universities for a period of climate change turmoil, "two pandemics ago", the…
When I was writing my opinion article on (the lack of) readiness of universities for a period of climate change turmoil, "two pandemics ago", the…
Gemarkeerd als interessant door Ilaria Cianchetta
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Elisa, our Editor-in-Chief, is at ICM2024, Bologna! Say hi if you see her 👋
Elisa, our Editor-in-Chief, is at ICM2024, Bologna! Say hi if you see her 👋
Gemarkeerd als interessant door Ilaria Cianchetta
Ook bekeken
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Susanne C. Brink
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Sahar Farajnia
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Rituparna Chakrabarti, PhD
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Christian Schulz
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Pengfei Kong
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Sheila Chari
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Matt Pavlovich
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Demis Menolfi, PhD
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Camilla Imarisio
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Andrew Bissette
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