Spatially resolved UV-VIS characterization of radiation-induced color centers in poly(styrene) and poly(vinyltoluene)

Essential to the characterization of materials using analytical electron microscopy (AEM) techniques is the specimen itself. Without suitable samples, detailed microstructural analysis is not possible. Ultramicrotomy, or diamond knife sectioning, is a well-known mechanical specimen preparation technique which has been gaining attention in the materials science area. Malis and co-workers and Glanvill have demonstrated the usefulness and applicability of this technique to the study of a wide variety of materials including Al alloys, composites, and semiconductors. Ultramicrotomed specimens have uniform thickness with relatively large electron-transparent areas which are suitable for AEM anaysis.Interface Analysis in Type 316 Austenitic Stainless Steel: STEM-EDS microanalysis of grain boundaries in austenitic stainless steels provides important information concerning the development of Cr-depleted zones which accompany M23C6 precipitation, and documentation of radiation induced segregation (RIS). Conventional methods of TEM sample preparation are suitable for the evaluation of thermally induced segregation, but neutron irradiated samples present a variety of problems in both the preparation and in the AEM analysis, in addition to the handling hazard.

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Molecular Characterization of Radiation-induced Glioblastoma

10.1055/s-0038-1675281 ◽

2018 ◽

Author(s):

MY Deng ◽

D Sturm ◽

E Pfaff ◽

GP Balasubrama ◽

J Schittenhelm ◽

...

Keyword(s):

Molecular Characterization ◽

Radiation Induced

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Use of Amperometric and Potentiometric Probes in Scanning Electrochemical Microscopy for the Spatially-Resolved Monitoring of Severe Localized Corrosion Sites on Aluminum Alloy 2098-T351

Sensors ◽

10.3390/s21041132 ◽

2021 ◽

Vol 21 (4) ◽

pp. 1132 ◽

Cited By ~ 1

Author(s):

Rejane M. P. da Silva ◽

Javier Izquierdo ◽

Mariana X. Milagre ◽

Abenchara M. Betancor-Abreu ◽

Isolda Costa ◽

...

Keyword(s):

Scanning Electrochemical Microscopy ◽

Oxygen Depletion ◽

Localized Corrosion ◽

Alloy Surface ◽

Al Alloy ◽

Spatially Resolved ◽

Lower Oxygen ◽

Local Ph ◽

Electrochemical Microscopy

Amperometric and potentiometric probes were employed for the detection and characterization of reactive sites on the 2098-T351 Al-alloy (AA2098-T351) using scanning electrochemical microscopy (SECM). Firstly, the probe of concept was performed on a model Mg-Al galvanic pair system using SECM in the amperometric and potentiometric operation modes, in order to address the responsiveness of the probes for the characterization of this galvanic pair system. Next, these sensing probes were employed to characterize the 2098-T351 alloy surface immersed in a saline aqueous solution at ambient temperature. The distribution of reactive sites and the local pH changes associated with severe localized corrosion (SLC) on the alloy surface were imaged and subsequently studied. Higher hydrogen evolution, lower oxygen depletion and acidification occurred at the SLC sites developed on the 2098-T351 Al-alloy.

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