Search Results for Raman spectroscopy

Raman spectroscopy is an indispensable tool in laboratories conducting research in the nascent field of carbon nanomaterials. It provides comprehensive information about the structure and layer thickness of graphene samples with high levels of sensitivity, stability, and control.

This article series explores the indispensable role of characterization in the development of cold spray coatings and illustrates some of the common processes used during coating development.

Residual stress is generally defined as the stress that is retained in equilibrium in a body or material after manufacturing or processing operations or component usage in the absence of any external forces. This article provides an overview of residual stress measurement methods, including diffraction-based, piezo-spectroscopic/Raman, mechanical, ultrasound, and magnetic techniques. It includes a discussion of measurement planning and execution considerations.

This new article series explores the indispensable role of characterization in the development of cold spray coatings and illustrates some of the common processes used during coatings development. This article provides a list of techniques to be covered in subsequent articles.

A new ISO standard could help spur development of new surface treatments and innovative products that can help defend against harmful bacteria and biofilms. This article describes the successful development and adoption of a new standard, ISO 4768:2023, that addresses measurement of anti-biofilm activity on plastic and other nonporous surfaces.

With today’s sophisticated measurement technology and testing equipment, manufacturers need never be in doubt over the quality of their starting materials and any property changes that occur in process. This interview addresses some of the key processes and technologies used to verify material stocks.

The discovery of new phases of carbon and direct conversion of carbon into diamond and diamond-like materials—at ambient conditions and without a catalyst—is a breakthrough with tremendous potential for electronics and hard-materials applications.

This article summarizes the more common analytical techniques for studying ancient metal artifacts, illustrated by case histories. There are two main classifications: noninvasive and invasive techniques. This distinction is of prime importance because some heritage objects may be too rare or valuable for invasive sampling, or there may be ethical objections to certain types of examination. Noninvasive examination of ancient metal artifacts is important, yet it cannot provide the detailed information obtainable from invasive techniques. This is especially true when artifacts contain “hidden” damage and there is also a need for accurate quantitative analyses.

A look at Monel after decades of exposure to the environment shows more work is needed to address the lack of scientific research and information in the conservation literature. Three case studies are presented related to the analysis of Monel artifacts.

Wavelength-dependent or hyperspectral imaging is a novel nondestructive characterization technique in the field of neutron radiography and computed tomography. A dedicated facility named VENUS is currently being built at Oak Ridge National Laboratory to provide these characterization capabilities for academia, industry, and other national laboratories. This feature article describes the VENUS capabilities for materials science and engineering, provides a quick overview of the modes of access of the facility, and illustrates the nondestructive measurements and interpretation of results.

This case study details the noninvasive analysis of an 5000-year-old silver figurine from Iran, now in the collection of The Metropolitan Museum of Art. The The object of this study, a figure of a kneeling bull clothed in a robe with a stepped linear pattern and holding up a spouted vessel, is composed of 15 pieces of worked silver joined together with silver solder. The aim of the study is to apply noninvasive micro-xray fluorescence spectroscopy (μ-XRF) analysis to characterize the silver alloy compositions and compare the new data with previously obtained results from invasive chemical analyses of samples performed by thermal neutron activation.

To meet the rigorous demands of next-generation computer technology, new approaches to nondestructive measurement for early stage, temperature dependent materials characterization are needed. Terahertz spectroscopy bypasses the limitations of other characterization techniques by enabling nondestructive measurement under variable temperature and high magnetic field conditions.

New thermal and cold spray technologies are being developed to extend the lifespan of thermal barrier coating (TBC) systems at elevated temperatures. This article describes the relevant attributes of coating technologies such as high velocity air fuel, high velocity air plasma spray, and high pressure cold spray for use in TBC systems.

This article provides an overview of pulsed laser dewetting self-assembly (PLDSA) and its use in the production of silver and cobalt films with desired nanostructure.

As today's electronics systems continue to shrink and become more complex and pervasive, failures can cause costly downtime, product delays and recalls, and debilitating reputational damage. Finding and fixing failures before they do damage is important, but becomes increasingly challenging when devices are built using ever more complex designs. The solution is to employ a comprehensive, multidisciplinary approach to electronic system failure analysis. In addition, many failures can be avoided altogether by thorough testing, coupled with the latest focused ion beam circuit edit techniques. These advanced methods quickly and inexpensively debug and validate design fixes or explore design optimization opportunities in integrated circuits without having to commit to costly and time-consuming full mask spins.

News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: 2015 class of ASM Fellows; ASM holds its first-ever Affiliate Summit in July 2015; spotlight for ASM Handbook, Volume 7 editors Prasan Samal and Joseph Newkirk.

News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: Frederick Schmidt chairs 2025 nominating committee; affiliate societies name committee chairs for 2024-2025 term; updates from ASM President Navin Manjooran and Executive Director Veronica Becker; President Manjooran visits India chapters; Hani Henein recognized for research transfer success; In memoriam for Gordon W. Powell.

News about ASM members, chapters, events, awards, conferences, affiliates, and other society activities. Topics include: ASM Materials Education Foundation announces 2021 scholarship winners; ASM Constitutional Amendments approved by the ASM Board in September 2021; ASM Acting Executive Director Ron Aderhold recaps the IMAT and Heat Treating events held in September 2021; updates to the ASM volunteer structure to encourage the formation of new technical communities and committees; celebrating 50 years of ASM Historical Landmarks; Briana Richardson and Scott Spohler announced as recipients of the 2021 Kishor M. Kulkarni Distinguished High School Teacher Award; professional profile for Ingrid M. Padilla Espinosa.