Characterization of atmospheric aerosols in the Antarctic region using Raman Spectroscopy and Scanning Electron Microscopy

2022 ◽  
Vol 266 ◽  
pp. 120452
Author(s):  
César Marina-Montes ◽  
Luis V. Pérez-Arribas ◽  
Jesús Anzano ◽  
Silvia Fdez-Ortiz de Vallejuelo ◽  
Julene Aramendia ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Atmospheric Aerosols ◽  
Antarctic Region ◽  
The Antarctic ◽  
Scanning Electron

Tribological Characterization of N 80A and 21-4N Valve Materials Against GGG-40 Seat Material Under Dry Sliding Conditions at Temperatures Up To 500 °C

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Sheikh Shahid Saleem ◽  
M. F. Wani
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Dry Sliding ◽  
Nimonic 80A ◽  
Tribological Characterization ◽  
Scanning Electron

Friction and wear studies of Nimonic 80A and 21-4N valve materials against GGG-40 under dry sliding conditions, at temperatures ranging from 50 °C to 500 °C, are presented in this paper. Friction coefficient was found to be continuously decreased with time for all tests with prominent running-in behavior seen in the 50 °C and 500 °C tests. Higher friction coefficient and wear were observed at 300 °C as compared to those at 50 °C and 500 °C. Formation of oxide Fe3O4, at 300 °C, was confirmed by Raman spectroscopy, which resulted in a higher friction coefficient and wear. Raman spectroscopy further revealed the presence of α-Fe2O3, hematite, in most cases, with the presence of oxides of Ni–Cr and Ni–Fe as well. Energy dispersive spectroscopy (EDS) results on the samples confirmed the same. Wear at 500 °C was found to be the least for both the valve materials with scanning electron microscopy (SEM) confirming the formation of well-developed glaze layers.

Study and characterization of the carbon-based nanoparticles obtained from PET

2013 ◽  
Vol 1549 ◽  
pp. 149-154
Author(s):  
Alena Borisovna Kharissova ◽  
Edgar de Casas Ortiz ◽  
Oxana V. Kharissova ◽  
Ubaldo Ortiz Mendez ◽  
Boris I. Kharisov
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Raman Spectroscopy ◽  
Normal Pressure ◽  
Transmission Electron ◽  
Polymer Type ◽  
Scanning Electron ◽  
Carbon Based

ABSTRACTMaterial like PET {polyethylene terephthalate (C10H8O4)n} are usually thrown away present in glasses of refreshments, water bottles between others which are hard to be degraded. However, this material can be recycled and used to acquire nanostructures. During this investigation the objective was to obtain nanoparticles and carbon based nanostructures from the polymer type PET by means of microwave irradiation at the temperature of 260°C at normal pressure and at 600 psi in the presence of acids, ethylene glycol and by means of calcinations. The obtained nanoparticles of ultrananocrystalline diamonds were studied by means of scanning electron microscopy (SEM), high-resolution transmission electron microscopy (TEM), and Raman spectroscopy.

scholarly journals Mineral characterization of soil type ranker formed on serpentines occurring in southern Belgrade environs Bubanj Potok

2012 ◽  
Vol 27 (2) ◽  
pp. 131-136
Author(s):  
Bozidar Cekic ◽  
Valentin Ivanovski ◽  
Aleksandar Djordjevic ◽  
Velimir Aleksic ◽  
Zorica Tomic ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Soil Type ◽  
X Ray Diffraction ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Detrital Mineral ◽  
Scanning Electron

The paper addresses the issue of health risk associated with the presence of chrysotile in the soil type ranker formed on massive serpentines occurring in the area of Bubanj Potok, a settlement located in the southern Belgrade environs, Serbia. Characterization of the ranker soil was conducted by scanning electron microscopy, X-ray diffraction, micro-Raman spectroscopy and transmission 57Fe M?ssbauer spectroscopy. Scanning electron microscopy figures showed regular shaped smectite (montmorillonite) particles, aggregates of chlorite, and elongated sheets of serpentines minerals antigorite. X-ray diffraction analysis confirmed the presence of detrital mineral quartz polymorph as well as minor amounts of other mineral species. Micro-Raman spectroscopy identified the presence of dominant minerals, such as montmorillonite, kaolinite, muscovite, gypsum, calcite, albite, amphiboles (hornblende/kaersutite) and orthoclase. Important polymorph silica modifications of quartz, olivine (forsterite), pyroxene (enstatite/ferrosilite, diopside/hedenbergite), and serpentine (antigorite/lizardite/chrysotile) were identified.

scholarly journals Characterization of KNb3O8 Powders by Raman Spectroscopy and Scanning Electron Microscopy

2020 ◽  
Vol 26 (S2) ◽  
pp. 2190-2191
Author(s):  
Francisco Rojas Gonzalez ◽  
Ofelia Hernandez Negrete ◽  
Hilda Esparza Ponce ◽  
Roberto Duarte Zamorano ◽  
Roberto Carrillo Torres ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Scanning Electron

Synthesis and Characterization of Hydrogels with Ag Nanoparticles

MRS Advances ◽  
2018 ◽  
Vol 3 (63) ◽  
pp. 3799-3804
Author(s):  
K. G. H Martínez-Reyna ◽  
M. G. García-Valdivieso ◽  
H. R. Navarro-Contreras
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Antibacterial Properties ◽  
Synthesis And Characterization ◽  
Polymerization Time ◽  
Volume Percentage ◽  
Scanning Electron

ABSTRACTHydrogels made of sodium 2-acrylamide-2-methypropanesulfonate were synthesized with the goal of creating a polymer for tissue engineering applications. The hydrogels were doped with silver nanoparticles to create hydrogel/Ag with possible antibacterial properties. We varied the weight/volume percentage of Laponite from 3 to 10 w/v% to alter the rheological properties of the hydrogels. Raman spectroscopy was used to study the progress of the chemical reaction at different polymerization times under ultraviolet radiation. By comparing the changes in the intensities of the Raman bands corresponding to C=C and C–C bonds with reaction time, we found that the optimal polymerization time to obtain chains of poly(2-acrylamide-2-methylpropanesulfonate) was 3 to 4 h. Characterization of the hydrogels with scanning electron microscopy indicated pore sizes of 1 to 6 µm.

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