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Lithium analysis in Li‐ion battery materials via a scanning electron microscopy‐based approach

Published: Sep 2, 2018

Author(s): Noboru Taguchi, Hikari Sakaebe, Shingo Tanaka

Journal: Surface and Interface Analysis

We performed Li analysis by reflection electron energy loss spectroscopy (REELS) with a scanning electron microscopy‐based apparatus. It was possible to distinguish between Li compounds containing different transition metal elements spatially, via the spectrum imaging scheme of REELS spectra. We also acquired the Li spectrum for an Li‐inserted graphite negative electrode. REELS measurements with hemispherical analyzer were performed to...

Read More thumbnail image: Lithium analysis in Liion battery materials via a scanning electron microscopybased approach

Development of quantitative imaging mass spectrometry ( q ‐IMS) for drug visualization using animal tissues

Published: Sep 2, 2018

Author(s): Emi Takeo, Shuichi Shimma

Journal: Surface and Interface Analysis

Quantitative imaging mass spectrometry (q‐IMS) is a frontier topic of research in drug analysis. Although many q‐IMS methodologies have been reported, validation of the method is insufficient. We have investigated the feasibility of coupling q‐IMS with liquid chromatography‐tandem mass spectrometry (LC‐MS/MS) to develop a verifiable method. The approach combines quantitative LC‐MS/MS information with the spatial distribution information obtained by...

Read More thumbnail image: Development of quantitative imaging mass spectrometry  q IMS for drug visualization using animal tissues

Effect of water on the interfacial structures of room‐temperature ionic liquids

Published: Sep 2, 2018

Author(s): Shouhei Kawada, Eri Kodama, Keisuke Sato, Shuhei Ogawa, Masaya Watanabe, Hikaru Okubo, Shinya Sasaki

Journal: Surface and Interface Analysis

The interfacial structures of cyano‐based room‐temperature ionic liquids play a very important role in reducing friction. However, the presence of water impairs their tribological performance. The interfacial structures and friction forces of 1‐ethyl‐3‐methylimidazolium dicyanamide, [EMIM][DCN], and the effect of water on these structures and forces were investigated using atomic force microscopy. In addition, the interaction of water and...

Read More thumbnail image: Effect of water on the interfacial structures of roomtemperature ionic liquids

Cathodoluminescence analysis of nonmetallic inclusions of nitrides in steel

Published: Sep 2, 2018

Author(s): Susumu Imashuku, Kazuaki Wagatsuma

Journal: Surface and Interface Analysis

Identification of nitride inclusions such as boron nitride (BN) and aluminum nitride (AlN) is important in the steelmaking industry because BN inclusions deteriorate the creep strength of ferritic heat‐resistant steel, and AlN inclusions cause transverse cracking in twin‐induced‐plasticity steel. The conventional method employed for the analysis of such inclusions in steel comprises both optical microscopy and electron probe microanalysis...

Read More thumbnail image: Cathodoluminescence analysis of nonmetallic inclusions of nitrides in steel

Scanning electrochemical cell microscopy for visualization and local electrochemical activities of lithium‐ion (de) intercalation process in lithium‐ion batteries electrodes

Published: Sep 2, 2018

Author(s): Akichika Kumatani, Yasufumi Takahashi, Chiho Miura, Hiroki Ida, Hirotaka Inomata, Hitoshi Shiku, Hirokazu Munakata, Kiyoshi Kanamura, Tomokazu Matsue

Journal: Surface and Interface Analysis

Scanning electrochemical cell microscopy with a single barrel micro‐/nano‐pipette (SECCM) was applied to lithium iron phosphate (LiFePO4) composite positive electrodes and an isolated LiFePO4 secondary particle for lithium‐ion batteries. To analyze lithium‐ion (Li+) charge or discharge process on the electrodes using local probe, a pipette filled with LiCl electrolyte solution and Ag/AgCl quasi‐reference counter electrode (QRCE) was used. Both the...

Read More thumbnail image: Scanning electrochemical cell microscopy for visualization and local electrochemical activities of lithiumion de intercalation process in lithiumion batteries electrodes

Direct and indirect assessment of cancer metabolism explored by MRI

Published: Aug 31, 2018

Author(s): Shun Kishimoto, Nobu Oshima, Murali C. Krishna, Robert J. Gillies

Journal: NMR in Biomedicine

Magnetic resonance‐based approaches to obtain metabolic information on cancer have been explored for decades. Electron paramagnetic resonance (EPR) has been developed to pursue metabolic profiling and successfully used to monitor several physiologic parameters such as pO2, pH, and redox status. All these parameters are associated with pathophysiology of various diseases. Especially in oncology, cancer hypoxia has been intensively studied...

Read More thumbnail image: Direct and indirect assessment of cancer metabolism explored by MRI

Assessing the reproducibility of an O ‐glycopeptide enrichment method with a novel software, Pinnacle

Published: Aug 30, 2018

Author(s): Adam Pap, Amol Prakash, Katalin F. Medzihradszky, Zsuzsanna Darula

Journal: ELECTROPHORESIS

Abstract A novel software, Pinnacle was used to reassess the reproducibility of a 2‐step lectin‐based O‐glycopeptide enrichment method. A publicly available dataset consisting of 12 data files representing 3 technical replicates of enriched glycopeptides from human serum was investigated. Previously, an attempt for reproducibility assessment was made utilizing an MS/MS scan (MS2)‐based method. However, the stochastic nature of precursor ion...

Read More thumbnail image: Assessing the reproducibility of an O glycopeptide enrichment method with a novel software Pinnacle

On the recent developments of insulator‐based dielectrophoresis: A review

Published: Aug 30, 2018

Author(s): Blanca H. Lapizco‐Encinas

Journal: ELECTROPHORESIS

Abstract Insulator‐based dielectrophoresis (iDEP), also known as electrodeless DEP, has become a well‐known dielectrophoretic technique, no longer viewed as a new methodology. Significant advances on iDEP have been reported during the last 15 years. This review article aims to summarize some of the most important findings on iDEP organized by the type of dielectrophoretic mode: streaming and trapping iDEP. The former is primarily...

Read More thumbnail image: On the recent developments of insulatorbased dielectrophoresis A review

Decision support algorithm for the selection of analytical methods in organic compounds detection for future extraterrestrial exploratory missions

Published: Aug 30, 2018

Author(s): Bence Mátyás, Gabriela Bautista, Máté Szarka, Vanessa Serrano, Juan Morales Arteaga, David Loja, Stalin Gabriel Yaguana, Francisco Gómez, Lenin J. Ramírez‐Cando

Journal: ELECTROPHORESIS

Abstract The search for biotic compounds beyond planet Earth is among the highest priorities in space discovery. We sought to detect organic molecules in various earth soil samples collected from environments with extreme climatic conditions comparable to extraterrestrial environments using HPLC, spectrophotometry (UV, IR), GC/MS and vertical gel electrophoresis analyses systems. The applied methods in the study were compared using...

Read More thumbnail image: Decision support algorithm for the selection of analytical methods in organic compounds detection for future extraterrestrial exploratory missions

Identification of metabolites of evobrutinib in rat and human hepatocytes by using ultra‐high performance liquid chromatography coupled with diode array detector and Q Exactive Orbitrap tandem mass spectrometry

Published: Aug 29, 2018

Author(s): Zeyun Li, Lizhen Zhang, Yongliang Yuan, Zhiheng Yang

Journal: Drug Testing and Analysis

Abstract Evobrutinib is a highly selective inhibitor of Bruton's tyrosine kinase (BTK) which may be clinically effective in treating certain autoimmune diseases. The purpose of the present study was to investigate the metabolism of evobrutinib in rat and human hepatocytes. Evobrutinib was incubated with rat and human hepatocytes at 37°C for 2 hours after which the samples were analyzed by ultra‐high performance liquid...

Read More thumbnail image: Identification of metabolites of evobrutinib in rat and human hepatocytes by using ultrahigh performance liquid chromatography coupled with diode array detector and Q Exactive Orbitrap tandem mass spectrometry

Photoelectron emission characteristics of iron surfaces scratched in different environments: Dependence on photon energy irradiation methods

Published: Aug 29, 2018

Author(s): Yoshihiro Momose, Takao Sakurai, Keiji Nakayama

Journal: Surface and Interface Analysis

The characteristics of photoelectron emission (PE) and X‐ray photoelectron spectroscopy of iron surfaces scratched in different environments were investigated. The scratching environments were air, water, and organic liquids. The PE quantum yields (emitted electrons/photon), YFD and Ys, were obtained in 2 ways of irradiation of the surface with photon energies: during the light wavelength scan in the range of 300 to 200 nm at 25°C,...

Read More thumbnail image: Photoelectron emission characteristics of iron surfaces scratched in different environments Dependence on photon energy irradiation methods

Changes in the Raman spectra of monolayer MoS 2 upon thermal annealing

Published: Aug 29, 2018

Author(s): Ho‐Jong Kim, Daehee Kim, Suyong Jung, Myung‐Ho Bae, Yong Ju Yun, Sam Nyung Yi, Jeong‐Seon Yu, Jong‐Hyun Kim, Dong Han Ha

Journal: Journal of Raman Spectroscopy

Abstract Defects have crucial effects on the electronic and optoelectronic properties of two‐dimensional materials. In this work, we measured the changes in the Raman spectra and electrical conductance of monolayer molybdenum disulfide (MoS2) with increasing defects via thermal annealing in a reducing atmosphere. Raman spectra of the basal plane MoS2 on SiO2 differed from those of the edge and revealed intricate changes upon annealing up to 550°C due to...

Read More thumbnail image: Changes in the Raman spectra of monolayer MoS 2 upon thermal annealing

Combined immuno‐purification and detection of recombinant erythropoietins and activin receptor type II‐Fc fusion proteins by isoelectric focusing for application in doping control

Published: Aug 28, 2018

Author(s): Laurent Martin, Michel Audran, Alexandre Marchand

Journal: Drug Testing and Analysis

Abstract Iso‐electric focusing (IEF) was the first method established to discriminate endogenous and recombinant erythropoietins (rEPOs). It is still approved by the World Anti‐Doping Agency (WADA) as an initial testing procedure to detect erythropoiesis stimulating agents (ESAs) in doping control samples. However EPO‐Fc, one of the prohibited rEPOs designated by WADA, is not detectable with the actual IEF conditions. Other newly...

Read More thumbnail image: Combined immunopurification and detection of recombinant erythropoietins and activin receptor type IIFc fusion proteins by isoelectric focusing for application in doping control

Analysis of inorganic cations and amino acids in high salinity samples by capillary electrophoresis and conductivity detection: Implications for in‐situ exploration of ocean worlds

Published: Aug 28, 2018

Author(s): Mauro Sergio Ferreira Santos, Thiago Gomes Cordeiro, Aaron C. Noell, Carlos D. Garcia, Maria F. Mora

Journal: ELECTROPHORESIS

Abstract With growing interest in exploring ocean worlds, such as Europa and Enceladus, there is a fundamental need to develop liquid‐based analytical techniques capable of handling high salinity samples while performing both bulk and trace species measurements. In this context, CE with capacitively coupled contactless conductivity detection (CE–C4D) has tremendous potential. One of its advantages is that this combination allows the detection...

Read More thumbnail image: Analysis of inorganic cations and amino acids in high salinity samples by capillary electrophoresis and conductivity detection Implications for insitu exploration of ocean worlds

Complete detoxification reaction by NO reduction with CO over nano‐sized copper‐substituted Cr 2 O 3

Published: Aug 28, 2018

Author(s): Rahul D. Kerkar, Mithil S. Fal Desai, Arun V. Salker

Journal: Surface and Interface Analysis

Simultaneous detoxification of nitric oxide and carbon monoxide was investigated over fibrous pristine and copper‐substituted Cr2O3 catalysts. Catalysts were synthesized using glycine combustion method. The prepared catalysts were characterized using X‐ray diffraction, infrared spectroscopy, diffuse reflectance spectra, SEM‐energy‐dispersive X‐ray, transmission electron microscopy, XPS, H2‐temperature programmed reduction, and...

Read More thumbnail image: Complete detoxification reaction by NO reduction with CO over nanosized coppersubstituted Cr 2 O 3

Temperature‐dependent magnetic and synchrotron radiation–based structural study of Fe/Al multilayers

Published: Aug 28, 2018

Author(s): Ranjeet Brajpuriya

Journal: Surface and Interface Analysis

This paper shows in situ annealing study of interface reaction of Fe/Al multilayer structure (MLS) grown by ion beam sputtering (IBS). The structural studies with respect to thermal annealing were carried out using synchrotron‐based grazing incidence X‐ray diffraction (GIXRD) and X‐ray reflectivity (XRR), at P08, high‐resolution XRD beamline. In situ annealing was done in a range from 200°C to 400°C. The structural studies show that (1)...

Read More thumbnail image: Temperaturedependent magnetic and synchrotron radiationbased structural study of FeAl multilayers

Predicting efficiency of NECEEM‐based partitioning of protein binders from nonbinders in DNA‐encoded libraries

Published: Aug 28, 2018

Author(s): Sven Kochmann, An T. H. Le, Ryan Hili, Sergey N. Krylov

Journal: ELECTROPHORESIS

Abstract Nonequilibrium capillary electrophoresis of equilibrium mixtures (NECEEM) is an affinity method for separating binder‐target complexes from nonbinders by gel‐free CE. NECEEM is a promising high‐efficiency method for partitioning protein binders from nonbinders in DNA‐encoded libraries (DEL), such binders are used as “hits” in drug development. It is important to be able to predict the efficiency of NECEEM‐based...

Read More thumbnail image: Predicting efficiency of NECEEMbased partitioning of protein binders from nonbinders in DNAencoded libraries

Near‐field enhancements and surface plasmon polaritons with multifunctional oxide thin films

Published: Aug 28, 2018

Author(s): Chahinez Dab, Reji Thomas, Thameur Hajlaoui, Andreas Ruediger

Journal: Journal of Raman Spectroscopy

Abstract The thickness of multifunctional oxide films directly affects the localized enhancement of the electromagnetic field and hence is a key factor for realizing novel photonic or optoelectronic devices. To this end, we theoretically exploit the principle of tip‐enhanced Raman spectroscopy on the surface of multifunctional oxide films (bismuth ferrite and barium titanate) on a gold substrate. An electromagnetic field enhancement...

Read More thumbnail image: Nearfield enhancements and surface plasmon polaritons with multifunctional oxide thin films

A digest of capillary electrophoretic methods applied to lipid analyzes

Published: Aug 27, 2018

Author(s): Véréna Poinsot, Hai Yen Ta, Varravaddheay Ong Meang, Lucie Perquis, Pierre Gavard, Bernard Pipy, François Couderc

Journal: ELECTROPHORESIS

Abstract Lipids are naturally occurring organic compounds that can be classified into a number of types based on their solubility in nonpolar organic solvents, and are generally insoluble in water. The great structural variety of these various types of lipids has led them to be components of many different biological substances such as oils, waxes, cellular membranes, tissues and biological fluids. The use of capillary...

Read More thumbnail image: A digest of capillary electrophoretic methods applied to lipid analyzes

SVM for FT‐MIR prostate cancer classification: An alternative to the traditional methods

Published: Aug 23, 2018

Author(s): Laurinda F.S. Siqueira, Camilo L.M. Morais, Raimundo F. Araújo Júnior, Aurigena Antunes Araújo, Kássio M.G. Lima

Journal: Journal of Chemometrics

Abstract In this paper, principal component analysis (PCA), successive projections algorithm (SPA), and genetic algorithm (GA) followed by support vector machines (SVM), combined with Fourier‐transform mid‐infrared (FT‐MIR) spectroscopy were presented as complementary or alternatives tools to the traditional methods for prostate cancer screening and classification. These approaches were applied to analyze tissue samples, and their...

Read More thumbnail image: SVM for FTMIR prostate cancer classification An alternative to the traditional methods
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