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Eingeladener Vortrag
- nein (287)
Nanoparticles (NPs) have become important materials for a variety of chemical technologies. The enhanced surface-area-to-volume ratio of NPs, making them excellent for use as catalyst, in analytical assays, and for antimicrobial applications.
Nickel NPs have exhibited immense potential as important catalyst for the Sabatier reaction, i.e. converting waste to energy via transformation of CO2 into CH4, and could replace the rare earth elements such as Ru, PT, or Rh. In this work we describe the solvothermal synthesis of monometallic and bimetallic nickel nanoparticles.
Monodisperse monometallic Ni NPs were synthesized using Oleylamin as solvent and reducing agent. The nanoparticles were investigated using small angle scattering (SAXS), scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDX), showing that the NPs are stable while the surface is not entirely covered. However, Ni has a high propensity to undergo oxidation, and becoming deactivated by coke formation. Hence, we further explore the preparation of bimetallic NPs, where a second metal is added to stabilize the Ni.
Bimetallic Cu-Ni NPs were synthesized by simultaneous solvothermal reduction. These bimetallic NPs exhibit excellent catalytic properties are promising candidates to be used as catalysts for efficient energy storage.
We present the synthesis of monodisperse monometallic Ni nanoparticles (NPs) and bimetallic NiCu respectively NiCo NPs. The NPs were investigated using SAXS, STEM, EDX, and XANES, showing that the NPs are size tunable and stable while the surface is not entirely covered. Nickel NPs have exhibited immense potential as important catalyst for the Sabatier reaction, i.e. converting waste to energy via transformation of CO2 into CH4.
Nanoparticles (NP) have become important materials for a variety of chemical technologies. The enhanced surface-area-to-volume ratio of NPs, making them excellent for use as catalyst, in analytical assays, and for antimicrobial applications.
Nickel NPs have exhibited immense potential as important catalyst for the Sabatier reaction, i.e. converting waste to energy via transformation of CO2 into CH4, and could replace the rare earth elements such as Ru, PT, or Rh. In this work we describe the solvothermal synthesis of monometallic and bimetallic nickel nanoparticles.
Monodisperse monometallic Ni NPs were synthesized using Oleylamin as solvent and reducing agent. The nanoparticles were investigated using small angle scattering (SAXS), scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy (EDX), showing that the NPs are stable while the surface is not entirely covered. However, Ni has a high propensity to undergo oxidation, and becoming deactivated by coke formation. Hence, we further explore the preparation of bimetallic NPs, where a second metal is added to stabilize the Ni.
Bimetallic Cu-Ni NPs were synthesized by simultaneous solvothermal reduction. These bimetallic NPs exhibit excellent catalytic properties are promising candidates to be used as catalysts for efficient energy storage.
In this poster we will present some results of a research projects dealing with Arabic recipes of black inks [1-2]. To improve conservation practices of Arabic manuscripts we have assessed the feasibility of the recipes collected from many Arabic sources on bookmaking and reproduced the most common inks. Ink samples were then artificially aged and analysed using an array of analytical techniques, mostly non-invasive, in order to build a database of Arabic inks and their ingredients and also to verify the detection limits of the portable equipment employed.
We will show procedures and problems concerning the identification of ink types and ingredients using reflectography (in Vis, IR and UV), X-Ray Fluorescence, Infrared and Raman spectroscopy. The focus will be in particular on squid ink [3] and mixed inks – both in the form of carbon inks with the addition of tannins and of a mixture of carbon and iron gall inks – which are particularly difficult to detect [4]. We will also examine the results of iron gall inks made with iron filings or nails instead of vitriol, the various precursor used to extract gallic acid that are mentioned in the sources as surrogates of gall nuts.
[1] A. Schopen, Tinten und Tuschen des arabisch-islamischen Mittelalters, Göttingen: Vandenhoeck & Ruprecht, 2004
[2] S. Fani, Le arti del libro secondo le fonti arabe originali. I ricettari arabi per la fabbricazione degli inchiostri (sec. IX-XIII): loro importanza per una corretta valutazione e conservazione del patrimonio manoscritto, PhD thesis, Napoli: Università L’Orientale, 2013
[3] S. Centeno, J. Shamir Journal of Molecular Structure, 873 (2008), 149-159
[4] C. Colini et. al, Manuscript cultures, 11 (2018) 43-50
Ink recipes from the islamic era: Texts, manuscripts, ink reproductions and scientific analyses
(2019)
Ink recipes can often be found in Arabic manuscripts. They may be included in treatises of diverse subjects – from handbooks for secretaries or calligraphers to books on arts and crafts, to alchemical and astrological essays. Recipes can also appear, with or without relation to the main text in the manuscript, in the form of lists or collections or even added in empty spaces as single entries. Why were these recipes written down? Were they used by the many professionals dealing with inks in their every-day work? Or were they part of the literary genre of adab with little or no practical application? To answer these questions a research project was set up: ink recipes have been collected from written Arabic sources, their feasibility has been assessed and some of them have been reproduced. These samples were artificially aged and analysed through an array of analytical techniques, most non-invasive and non-destructive, and the results compared to the data obtained by the application of the same analyses on concrete manuscripts. The codicological characteristics of the manuscripts have also been studied. My aim in this talk is to show how such an interdisciplinary approach could be beneficial for the study of material culture.
Fifty shades of black: Typologies and terminology of black inks in the light of new discoveries
(2019)
The identification of the materials constituting an artefact is the basis of any correct conservation project. For this reason (among others) in the last 50 years analytical techniques have been applied to the study of manuscripts. Unfortunately, the scientific investigation of Arabic books is still uncommon, focusing mainly on single case studies of illuminated manuscripts where the black media used to write the text is largely overlooked. This lack of knowledge prompted a recent research in which black ink recipes have been collected from written Arabic sources, their feasibility has been assessed, and some of them have been reproduced. These samples were artificially aged and analysed through an array of analytical techniques, mostly non-invasive and non-destructive, in order to build a database of Arabic inks and their ingredients and to verify the detection limits of the equipment employed. Finally, the results were compared to the data collected from historical manuscripts.
In this talk I will focus on the ink typologies and the terminology (ancient and modern) used to describe them. In particular I will highlight how even the modern classification fails to capture the variety encountered in both recipes and manuscripts, particularly in the light of recent discoveries. I will address especially the terminological and conceptual issues of mixed inks – in the form of carbon inks and tannins, of carbon and iron gall inks, and of carbon and metallic salts –, iron gall inks made without vitriol and iron gall inks made with sources of tannins different from gall nuts.
Papyrus was in use in the Islamic world until the 11th century and few ink recipes collected from treatises about the art of the books are dedicated to this support. But papyrus was also burnt in order to obtain soot used as an ingredient for a particular type of ink (midād al-qarāṭīs). In this talk I will give an overview of the recipes – in particular those by ar-Rāzī –, their context and transmission in order to evaluate this double nature of papyrus, which is considered at the same time a writing support and a material to be recycled. Moreover, I will discuss what kinds of ink are most likely to be found, according to these literary sources, on Arabic manuscripts and documents written on papyrus and compare them to the typologies mentioned for paper and parchment. These results are the premises of a research project starting at the beginning of 2019, in which a number of dated fragments from several European institutions will be analysed with non-destructive techniques in order to establish a profile of the main writing media used in the early centuries of the Islamic Era.
Statistically the mean time between damage events on rotor blades is 6 years (Deutscher Windenergie Report 2006). Due to imperfection in the production the shell structures get cracks after a few years fare before the designed life time. A shell test rig was built at BAM for efficient research on the effects of defects in production.
In-situ and ex-situ NDT give a better understanding from degradation processes in composite materials.
With advanced methods in the research on the fatigue behaviour of FRP it was found a load level of infinite life for GFRP and CFRP. This is in the range of typical strain values of airliners and rotor blades in normal operation.
Due to the fibre-composite nature NDT techniques have to be suitable to a wide length scale to image micro cracking as well as bigger defects. Therefore different techniques have to be applied and developed.