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Characterization of Two-Dimensional Transition Metal Dichalcogenides in the Scanning Electron #Microscope Using Energy Dispersive X-ray Spectrometry, Electron Backscatter Diffraction, and Atomic Force #Microscopy

Here we show how by processing energy dispersive X-ray spectrometry (EDS) data obtained using highly sensitive, new generation EDS detectors in the AZtec LayerProbe software we can obtain data of sufficiently high quality to non-destructively measure the number of layers in two-dimensional (2D) MoS2 and MoS2/WSe2 and thereby enable the characterization of working devices based on 2D materials. We compare the thickness measurements with EDS to results from atomic force microscopy measurements. We also show how we can use electron backscatter diffraction (EBSD) to address fabrication challenges of 2D materials. Results from EBSD analysis of individual flakes of exfoliated MoS2 obtained using the Nordlys Nano detector are shown to aid a better understanding of the exfoliation process which is still widely used to produce 2D materials for research purposes.

The #SEM analysis was conducted on a #TESCAN Mira Field Emission SEM with an X-Max 150 EDS detector (Oxford Instruments, UK) and a Nordlys Nano EBSD camera (Oxford Instruments).

#analysis #science #materialsscience

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We are pleased to announce the launch of the high-resolution Xe plasma #FIB column technology. The newly developed ion column is now capable of achieving #resolution of < 15 nm at 30 keV.
This improvement has made Xe #plasma FIB a more versatile nano/micro-patterning tool extending its range of use into the area of traditional Ga FIB applications.

With the new high-resolution Xe plasma FIB column you can complete large-scale milling tasks in unbeatable times at high currents, and, on the other hand, perform tasks using the smallest spot size for all those applications that require higher levels of precision. This is a significant improvement over the state-of-the-art.

#TESCAN #improvement #semiconductors #microelectronics #analysis #FERA3 #XEIA3

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Comprehensive Characterization of Lignocellulosic Fruit Fibers Reinforced Hybrid #Polyester #Composites

This work is focused to fabricate and characterize hybrid polyester composites containing equal weight percentages of lignocellulosic fruit fibers namely Cocos nucifera and Luffa cylindrica. Samples with four different compositions (10%, 20%, 30%, and 40%) containing random fiber orientation are fabricated using handlayup technique and their effect on the flexural strength and impact strength is studied and compared with their individual counterparts. Enhanced mechanical properties are obtained when the combined weight percentage of both fibers is 30% by weight. This hybrid composite sample is characterized by Fourier Transform Infrared spectroscopy, X-ray diffraction and Thermogravimetric analysis. Surface morphology of the fractured sample with elemental analysis is studied using scanning electron microscope and Energy Dispersive Analysis of X-rays. FTIR peaks confirm the presence of biopolymers cellulose, hemicellulose and lignin. The thermogram confirms the presence of lignin, an amorphous hydrophobic biopolymer with strong intermolecular, intramolecular hydrogen bond and cross linking of the molecules requiring more energy to breakdown resulting in good thermal stability of the hybrid composites around 200°C. Elemental analysis gives O/C ratio of 0.45 corroborating the lignin presence at the surface.

The morphology of the fractured surfaces of the hybrid samples are examined using a Scanning Electron Microscope #VEGA3 #TESCAN which is operated at 20 kV. Prior to SEM analysis, the samples are sputter coated with gold to avoid charging. Energy Dispersive Spectrometer #EDS analyzer (Bruker) is used for the elemental analysis of the composites. Microanalysis is performed at an accelerating voltage of 20.0 kV and at a working distance of 14.4 mm.

#materialscience #science #analysis #microscope #microscopy 

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AXT engineers are currently installing this +TESCAN VEGA3 Scanning Electron Microscope at a site in #Brisbane. It will be used for #lifescience and #biological applications in #medicalresearch. #biology #SEM #microscopy #microscope +TESCAN ORSAY HOLDING a.s. +Tescan Brno

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A New Member of the Graphene Family: Graphene Acid

A new member of the family of graphene derivatives, namely, graphene acid with a composition close to C1(COOH)1, was prepared by oxidation of graphene oxide. The synthetic procedure is based on repeated oxidation of graphite with potassium permanganate in an acidic environment. The oxidation process was studied in detail after each step. The multiple oxidations led to oxidative removal of other oxygen functional groups formed in the first oxidation step. Detailed chemical analysis showed only a minor amount of other oxygen-containing functional groups such as hydroxyl and the dominant presence of carboxyl groups in a concentration of about 30 wt %. Further oxidation led to complete decomposition of graphene acid. The obtained material exhibits unique sorption capacity towards metal ions and carbon dioxide. The highly hydrophilic nature of graphene acid allowed the assembly of ultrathin free-standing membranes with high transparency.

The morphology was investigated by SEM with a #FEG #electron source ( #TESCAN #LYRA3 dual-beam #microscope ).

#materialsscience #science #microscopy #analysis #research

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ATL-derived exosomes modulate mesenchymal stem cells: potential role in #leukemia progression

Exosomes are membrane nano-vesicles secreted by a multitude of cells that harbor biological constituents such as proteins, lipids, mRNA and microRNA. Exosomes can potentially transfer their cargo to other cells, implicating them in many patho-physiological processes. Mesenchymal stem cells (MSCs), residents of the bone marrow and metastatic niches, potentially interact with cancer #cells and/or their derived exosomes. In this study, we investigated whether exosomes derived from adult T-cell leukemia/lymphoma (ATL) cells act as intercellular messengers delivering leukemia-related genes that modulate the properties of human MSCs in favor of leukemia. We hypothesized that the cargo of ATL-derived exosomes is transferred to MSCs and alter their functional behavior to support the establishment of the appropriate microenvironment for leukemia.

The tabs were removed with a clean forceps, mounted on aluminum specimen mounts and examined by TESCAN #MIRA3 Scanning #Electron #Microscope (SEM).

#lifesciences #analysis #research #science #microscopy

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Nanofibrous Scaffolds as Promising Cell Carriers for Tissue Engineering

Nanofibers are promising cell carriers for tissue engineering of a variety of tissues and organs in the human organism. They have been experimentally used for reconstruction of tissues of cardiovascular, respiratory, digestive, urinary, nervous and musculoskeletal systems. Nanofibers are also promising for drug and gene delivery, construction of biosensors and biostimulators, and wound dressings. Nanofibers can be created from a wide range of natural polymers or synthetic biostable and biodegradable polymers. For hard tissue engineering, polymeric nanofibers can be reinforced with various ceramic, metal-based or carbon-based nanoparticles, or created directly from hard materials. The nanofibrous scaffolds can be loaded with various bioactive molecules, such as growth, differentiation and angiogenic factors, or funcionalized with ligands for the cell adhesion receptors. This review also includes our experience in skin tissue engineering using nanofibers fabricated from polycaprolactone and its copolymer with polylactide, cellulose acetate, and particularly from polylactide nanofibers modified by plasma activation and
fibrin coating. In addition, we studied the interaction of human bone-derived cells with nanofibrous scaffolds loaded with hydroxyapatite or diamond nanoparticles. We also created novel nanofibers based on diamond deposition on a SiO2 template, and tested their effects on the adhesion, viability and growth of human vascular endothelial cells.

FE-SEM #TESCAN #MIRA3 scanning #electron #microscope was used.

#nanofibers #nanoparticles #polymers #ceramics #carbon #diamond #biomaterial #biocompatibility #tissue #nanomedicine #lifesciences #analysis #research #science #microscopy

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"Dr. Pierangelo Gröning (right), Xavier Maeder, researcher at Empa Thun, and Katrin Fuhrer, CEO of Thuner Start-up Tofwerk AG, discuss the jointly developed mass spectrometer #TESCAN FIB-SEM, a measuring instrument for Materials Science analysis, for example of pollutant residues."

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Effect of Surface Pretreatment on Quality and Electrochemical Corrosion Properties of Manganese Phosphate on S355J2 HSLA #Steel

High strength low alloy (HSLA) steels exhibit many outstanding properties for industrial applications but suffer from unsatisfactory #corrosion resistance in the presence of aggressive chlorides. Phosphate coatings are widely used on the surface of steels to improve their corrosion properties. This paper evaluates the effect of a manganese phosphate coating prepared after various mechanical surface treatments on the electrochemical corrosion characteristics of S355J2 steel in 0.1 M NaCl electrolyte simulating aggressive sea atmosphere. The manganese phosphate coating was created in a solution containing H3PO4, MnO2, dissolved low carbon steel wool, and demineralised H2O. Scanning electron microscopy (SEM) was used for surface morphology observation supported by energy-dispersive X-ray analysis (EDX). The electrochemical corrosion characteristics were assessed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PD) measurements in the solution of 0.1 M NaCl. Method of equivalent circuits and Tafel-extrapolation were used for the analysis of the obtained results. Performed experiments and analysis showed that the morphological and corrosion properties of the surface with manganese phosphate are negatively influenced by sandblasting surface pretreatment.

The manganese phosphate morphology was observed by scanning #electron #microscopy (SEM) #LYRA3 #TESCAN and chemical analysis of coatings was realized by energy dispersive X-ray (EDX) technique.

#microscope #science #materialsscience #analysis #research

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