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Damage accumulation and structural modification in a‐ and c‐plane GaN implanted with 400‐keV and 5‐MeV Au + ions

Published: Mar 2, 2018

Author(s): A. Macková, P. Malinskyˊ, A. Jágerová, Z. Sofer, D. Sedmidubský, K. Klímová, R. Böttger, S. Akhmadaliev

Journal: Surface and Interface Analysis

c‐plane (0001) and a‐plane (11‐20) gallium nitride (GaN) epitaxial layers were grown by Metal organic Vapour Phase epitaxy (MOVPE) on sapphire and subsequently implanted with 400‐keV and 5‐MeV Au+ ions using fluences 5 × 1014 to 5 × 1015 cm−2. The shallow Au depth profiling was accomplished by Rutherford backscattering spectrometry. The structural changes during implantation and subsequent annealing were characterised by...

Read More thumbnail image: Damage accumulation and structural modification in a and cplane GaN implanted with 400keV and 5MeV Au  ions

Chemical state analysis using Auger parameters for XPS spectrum curve fitted with standard Auger spectra

Published: Mar 2, 2018

Author(s): Masahide Shima, Kenichi Tsutsumi, Akihiro Tanaka, Hiroshi Onodera, Masaki Tanemura

Journal: Surface and Interface Analysis

Chemical state analysis is quite important in X‐ray photoelectron spectroscopy. Auger parameter analysis is one of the useful methods to analyze the chemical state in X‐ray photoelectron spectroscopy, because it is not necessary to take the charging effect into account for the analysis of nonconductive materials, especially for the simple material systems of a single chemical state. For the analysis of complicated complex systems, here,...

Read More thumbnail image: Chemical state analysis using Auger parameters for XPS spectrum curve fitted with standard Auger spectra

Co‐implantation of Er and Yb ions into single‐crystalline and nano‐crystalline diamond

Published: Mar 2, 2018

Author(s): Jakub Cajzl, Banu Akhetova, Pavla Nekvindová, Anna Macková, Petr Malinský, Jiří Oswald, Zdeněk Remeš, Marián Varga, Alexander Kromka

Journal: Surface and Interface Analysis

The paper reports on the results of Er‐Yb and Er‐Al co‐implantation into commercial single‐crystalline diamonds as well as into nano‐crystalline diamond (NCD) thin films and their photoluminescence properties. The NCD thin films were deposited on fused silica glass by linear‐antenna microwave plasma‐enhanced chemical vapour deposition (PE MWCVD). Er implantation was performed at an energy of 190 keV and fluences of 1 × 1015...

Read More thumbnail image: Coimplantation of Er and Yb ions into singlecrystalline and nanocrystalline diamond

Quantitative analysis of Yb 4d photoelectron spectrum of metallic Yb

Published: Mar 2, 2018

Author(s): N. Pauly, F. Yubero, S. Tougaard

Journal: Surface and Interface Analysis

The measured Yb 4d3/2 intensity is larger than the Yb 4d5/2 in X‐ray photoelectron (XPS) emission of metallic Yb, which is unexpected. The shape and intensity of photoelectron peaks are strongly affected by extrinsic excitations due to electron transport out of the surface (including bulk and surface effects) and to intrinsic excitations due to the sudden creation of the static core hole. To quantitatively extract from experimental XPS...

Read More thumbnail image: Quantitative analysis of Yb 4d photoelectron spectrum of metallic Yb

Electrochemical characterization of PVA/SA nanofibers obtained by electrospinning processing

Published: Mar 2, 2018

Author(s): A. Covelo, K. K. Gómez, P. Corona‐Lira, A. C. Ramírez‐Reivich, M. Hernández

Journal: Surface and Interface Analysis

Sodium alginate (SA), a linear polysaccharide which is present in different forms, is commonly used for tissue engineering. One of the main challenges of using SA in tissue engineering consists of the fabrication of nanoparticles/nanofibres for cell culture scaffolds. Because SA has been developed for medical purposes, it is necessary to measure, among others, the electrochemical properties because they provide information of biological...

Read More thumbnail image: Electrochemical characterization of PVASA nanofibers obtained by electrospinning processing

Surface and microstructural analyses of a Roman quadrans dating back to first century ad

Published: Mar 2, 2018

Author(s): A.C. Ruggiero, S. Kaciulis, A. Mezzi, R. Montanari, P. Soltani, A. Varone

Journal: Surface and Interface Analysis

The paper reports the results of the analyses performed on a Roman quadrans dating back to the first century ad, belonging to a group of more than 8.000 coins found in the bed of river Tiber during an archaeological research in 1987–1988. The quadrans was examined by means of X‐ray diffraction, scanning electron microscopy, energy dispersion spectroscopy, and X‐ray photoelectron spectroscopy. Energy dispersion spectroscopy...

Read More thumbnail image: Surface and microstructural analyses of a Roman quadrans dating back to first century ad

Reduction and covalent modification of graphene‐oxide by nitrogen in glow discharge plasma

Published: Mar 2, 2018

Author(s): M. Mohai, K. László, I. Bertóti

Journal: Surface and Interface Analysis

In this work, we performed plasma treatment of thin layers of graphene oxide samples in various nitrogen containing gases (mainly NH3 and N2). Experiments were performed in the preparation chamber of the X‐ray photoelectron spectrometer, allowing “in situ” characterization of the treated surface. Introduction of nitrogen into the top surface was intensified by applying negative voltage on the sample between 0 and 300 V accelerating...

Read More thumbnail image: Reduction and covalent modification of grapheneoxide by nitrogen in glow discharge plasma

Determination of 16 antineoplastic drugs by capillary electrophoresis with UV detection: Applications in quality control

Published: Mar 1, 2018

Author(s): Nicolas Guichard, Marie Ogereau, Ludivine Falaschi, Serge Rudaz, Julie Schappler, Pascal Bonnabry, Sandrine Fleury‐Souverain

Journal: ELECTROPHORESIS

Abstract Two capillary electrophoresis (CE) methods were developed for the analysis of 16 antineoplastic drugs contained in injectable pharmaceutical formulations. A capillary zone electrophoresis (CZE) method coupled to UV was developed with a background electrolyte (BGE) made of a 100 mM phosphate buffer at pH 2.5 containing 50% v/v of acetonitrile and dynamic coating of capillaries with Ceofix®. This method allowed the analysis...

Read More thumbnail image: Determination of 16 antineoplastic drugs by capillary electrophoresis with UV detection Applications in quality control

Topics in chemometrics, TIC 2017, a personal report

Published: Feb 28, 2018

Author(s): Marcel Maeder

Journal: Journal of Chemometrics

Read More thumbnail image: Topics in chemometrics TIC 2017 a personal report

Challenges and emergent solutions for LC‐MS/MS based untargeted metabolomics in diseases

Published: Feb 27, 2018

Author(s): Liang Cui, Haitao Lu, Yie Hou Lee

Journal: Mass Spectrometry Reviews

In the past decade, advances in liquid chromatography‐mass spectrometry (LC‐MS) have revolutionized untargeted metabolomics analyses. By mining metabolomes more deeply, researchers are now primed to uncover key metabolites and their associations with diseases. The employment of untargeted metabolomics has led to new biomarker discoveries and a better mechanistic understanding of diseases with applications in...

Read More thumbnail image: Challenges and emergent solutions for LCMSMS based untargeted metabolomics in diseases

Diffusion MRI visualization

Published: Feb 27, 2018

Author(s): Thomas Schultz, Anna Vilanova

Journal: NMR in Biomedicine

Modern diffusion magnetic resonance imaging (dMRI) acquires intricate volume datasets and biological meaning can only be found in the relationship between its different measurements. Suitable strategies for visualizing these complicated data have been key to interpretation by physicians and neuroscientists, for drawing conclusions on brain connectivity and for quality control. This article provides an overview of visualization solutions...

Read More thumbnail image: Diffusion MRI visualization

Untargeted profiling of Glycyrrhiza glabra extract with comprehensive two‐dimensional liquid chromatography‐mass spectrometry using multi‐segmented shift gradients in the second dimension: Expanding the metabolic coverage

Published: Feb 27, 2018

Author(s): Yong Foo Wong, Francesco Cacciola, Soraya Fermas, Solange Riga, Darryl James, Valeria Manzin, Brice Bonnet, Philip John Marriott, Paola Dugo, Luigi Mondello

Journal: ELECTROPHORESIS

Abstract Metabolic profiling of Glycyrrhiza glabra using comprehensive two‐dimensional liquid chromatography (LC × LC) coupled with photodiode array (PDA) and mass spectrometry (MS) detection is described. The separation was conducted under reversed‐phase conditions, using a combination of first dimension (1D) 150 mm microbore cyano column utilising 2.7 μm diameter (dp) particles, and second dimension (2D) 50 mm...

Read More thumbnail image: Untargeted profiling of Glycyrrhiza glabra extract with comprehensive twodimensional liquid chromatographymass spectrometry using multisegmented shift gradients in the second dimension Expanding the metabolic coverage

Material data mining in Nianyi Chen's scientific family

Published: Feb 27, 2018

Author(s): Wencong Lu, Wei Lv, Qing Zhang, Kailiang Lu, Xiaobo Ji

Journal: Journal of Chemometrics

Abstract The origin of the material data mining (MDM) field in China can be traced back to Professor Nianyi Chen's pioneering contributions in the 80s of the 20th century. His scientific protégés have inherited his research legacy and been continuously pursuing research in this field. The present article provides an overview on the MDM research conducted by Nianyi Chen's scientific family, by reviewing these achievements of the...

Read More thumbnail image: Material data mining in Nianyi Chens scientific family

The analysis of alpha‐1‐antitrypsin glycosylation with direct LC‐MS/MS

Published: Feb 26, 2018

Author(s): Haidi Yin, Mingrui An, Pui‐kin So, Melody Yee‐Man Wong, David M. Lubman, Zhongping Yao

Journal: ELECTROPHORESIS

Abstract A liquid chromatography‐tandem mass spectrometry (LC‐MS/MS)‐based methodology has been developed to differentiate core‐ and antennary‐fucosylated glycosylation of glycopeptides. Both the glycosylation sites (heterogeneity) and multiple possible glycan occupancy at each site (microheterogeneity) can be resolved via intact glycopeptide analysis. The serum glycoprotein alpha‐1‐antitrypsin (A1AT) which contains both core‐ and...

Read More thumbnail image: The analysis of alpha1antitrypsin glycosylation with direct LCMSMS

2DE Gels: A Story of Love and Hate in Proteomics

Published: Feb 23, 2018

Author(s): Daniel Martins‐de‐Souza

Journal: PROTEOMICS

Read More thumbnail image: 2DE Gels A Story of Love and Hate in Proteomics

Latest advances in the extraction and determination of saffron apocarotenoids

Published: Feb 23, 2018

Author(s): Anastasia Kyriakoudi, Maria Z. Tsimidou

Journal: ELECTROPHORESIS

Abstract Saffron, the dried red stigmas of Crocus sativus L. plant, is the most expensive spice in the world. It is highly valued not only for the color and flavor that exerts to various foods and drinks but also for its functional properties. Various classes of apocarotenoids such as crocetin sugar esters, picrocrocin and safranal are responsible for these characteristics. In the present review, the evolution of the methods ...

Read More thumbnail image: Latest advances in the extraction and determination of saffron apocarotenoids

Removal of brilliant green and malachite green from aqueous solution by a viable magnetic polymeric nanocomposite: Simultaneous spectrophotometric determination of 2 dyes by PLS using original and first derivative spectra

Published: Feb 20, 2018

Author(s): Maryam Bagtash, Javad Zolgharnein

Journal: Journal of Chemometrics

Abstract Here, we describe the successful synthesis of a new magnetic nanocomposite and investigate simultaneous removal of 2 cationic dyes, brilliant green (BG) and malachite green (MG), from aqueous solutions. The nanocomposite is characterized by scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, thermal gravimetric analysis, and Fourier‐transform infrared spectrophotometry. The spectra of BG and MG in their mixture show...

Read More thumbnail image: Removal of brilliant green and malachite green from aqueous solution by a viable magnetic polymeric nanocomposite Simultaneous spectrophotometric determination of 2 dyes by PLS using original and first derivative spectra

Selective extraction of high‐value phenolic compounds from distillation wastewater of basil ( Ocimum basilicum L.) by pressurized liquid extraction

Published: Feb 16, 2018

Author(s): Imma Pagano, Andrea del Pilar Sánchez‐Camargo, Jose Antonio Mendiola, Luca Campone, Alejandro Cifuentes, Luca Rastrelli, Elena Ibañez

Journal: ELECTROPHORESIS

Abstract During the essential oil steam distillation from aromatic herbs, huge amounts of distillation wastewaters (DWWs) are generated. These by‐products represent an exceptionally rich source of phenolic compounds such as rosmarinic acid (RA) and caffeic acid (CA). Herein, the alternative use of dried basil DWWs (dDWWs) to perform a selective extraction of RA and CA by pressurized liquid extraction (PLE) employing bio‐based...

Read More thumbnail image: Selective extraction of highvalue phenolic compounds from distillation wastewater of basil  Ocimum basilicum L_ by pressurized liquid extraction

Uniform experimental design in chemometrics

Published: Feb 14, 2018

Author(s): Qing‐Song Xu, Yuan‐Da Xu, Lan Li, Kai‐Tai Fang

Journal: Journal of Chemometrics

Abstract Experimental designs and modeling are very important in chemometrics and chemical engineering. There are many kinds of experimental designs, which include the fractional factorial design (including the orthogonal design), the optimal regression design, and the uniform design. The uniform experimental design can be regarded as a fractional factorial design with model uncertainty, a space filling design for computer...

Read More thumbnail image: Uniform experimental design in chemometrics

Structural and photoelectron studies of Sn‐SnOx and SnO2 nanoparticles on TiO2 (110) surface

Published: Feb 14, 2018

Author(s): O. Leiko, Y. Kosto, K. Mašek

Journal: Surface and Interface Analysis

An Sn‐SnOx nanoparticles were prepared by the deposition of metallic tin in the reactive atmosphere of atomic oxygen. An oxidation of Sn‐SnOx nanoparticles in the oxygen pressures up to 3 mbar at 550 K in near‐ambient pressure (NAP) cell led to the formation of SnO2 nanoparticles. Both kinds of nanoparticles were investigated by means of photoelectron spectroscopies (XPS, NAP‐XPS), energy‐dispersive X‐ray spectroscopy (EDX), reflection...

Read More thumbnail image: Structural and photoelectron studies of SnSnOx and SnO2 nanoparticles on TiO2 110 surface
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