Elemental content of enamel and dentin after bleaching of teeth (a comparative study between laser-induced breakdown spectroscopy and x-ray photoelectron spectroscopy)

2013 ◽  
Vol 113 (23) ◽  
pp. 234701 ◽  
Author(s):  
H. Imam ◽  
Doaa Ahmed ◽  
Ashraf Eldakrouri
Keyword(s):  
Comparative Study ◽  
Photoelectron Spectroscopy ◽  
Laser Induced Breakdown Spectroscopy ◽  
Elemental Content ◽  
X Ray ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

Correlation of Trace Silicone Contamination Analyses on Epoxy Composites Using X-ray Photoelectron Spectroscopy (XPS) and Laser-Induced Breakdown Spectroscopy (LIBS)

2018 ◽  
Vol 73 (2) ◽  
pp. 229-235 ◽  
Author(s):  
Rodolfo Ledesma ◽  
Frank Palmieri ◽  
Brooke Campbell ◽  
William Yost ◽  
James Fitz-Gerald ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Composite Structures ◽  
Surface Characterization ◽  
Ease Of Use ◽  
Laser Induced Breakdown Spectroscopy ◽  
Production Environment ◽  
X Ray ◽  
Breakdown Spectroscopy ◽  
Effective Manner ◽  
Laser Induced Breakdown

Surface treatment and surface characterization techniques are critical to ensure that adherends are chemically activated and free of contaminants before adhesive bonding. Silicone contamination from mold release agents and other sources can interfere with interfacial bonding, decreasing the durability and performance of bonded composite structures. It is necessary to have tools and methods that can be used in a production environment to reliably detect low levels of contaminants in a rapid, simple, and cost-effective manner to improve bond reliability. In this work, surface characterization of carbon fiber reinforced polymer (CFRP) composites with epoxy matrix was performed using laser-induced breakdown spectroscopy (LIBS), and the results were compared with those obtained from X-ray photoelectron spectroscopy (XPS). Laser-induced breakdown spectroscopy offers many advantages over XPS in terms of ease of use, sample preparation, and real-time results. The objective of the comparison was to study the sensitivity of LIBS and to investigate the quantification of the surface species measured by LIBS. Another objective was to assess the reliability of each technique for surface contaminant characterization. The as-processed CFRP panels had trace surface silicone contamination from the fabrication process, the source of which was not investigated. The composites were laser treated at select average laser power levels, resulting in varying levels of contamination reduction. The Si atomic percentage measurements using XPS were conducted on both control and laser-ablated surfaces. The results showed an excellent correlation in Si concentration between the two techniques.

scholarly journals A non-calorimetric approach for investigating the moisture-induced ageing of a pyrotechnic delay material using spectroscopies

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Ji-Hoon Ryu ◽  
Jun-Ho Yang ◽  
Jack J. Yoh
Keyword(s):  
Photoelectron Spectroscopy ◽  
Heat Of Reaction ◽  
X Ray Diffraction ◽  
Calorimetric Analysis ◽  
X Ray ◽  
Breakdown Spectroscopy ◽  
Long Term Storage ◽  
Laser Induced Breakdown ◽  
Metal Fuel ◽  
Physical Changes

Abstract The degradation of thermal properties due to ageing such as burning rate and exothermic heat release are unsolved issues faced during a long-term storage of the pyrotechnic substances. Accordingly, we employed various non-calorimetric methods to investigate the thermal performance of pyrotechnic delay, which is exposed to various moisture-rich conditions at extended durations. The chemical and physical changes in the compositions of a pyrotechnic delay comprised of metal fuel (Zr-Ni alloy) and oxidants (KClO4, BaCrO4) are analysed for four different relative humidity levels using X-ray photoelectron spectroscopy, X-ray diffraction, scanning electron microscope and laser-induced breakdown spectroscopy. The calculations using the NASA Chemical Equilibrium with Applications (CEA) software indicated that the heat of reaction for the components stored under the moisture-rich conditions is reduced by more than 50%. Unlike the conventional calorimetric analysis, the present non-calorimetric approach provided the compositional changes as well as the cause and effect of the relevant ageing process of pyrotechnic delay.

Comparative study of femtosecond and nanosecond laser-induced breakdown spectroscopy of depleted uranium

2011 ◽  
Vol 50 (3) ◽  
pp. 313 ◽  
Author(s):  
Luke A. Emmert ◽  
Rosemarie C. Chinni ◽  
David A. Cremers ◽  
C. Randy Jones ◽  
Wolfgang Rudolph
Keyword(s):  
Comparative Study ◽  
Depleted Uranium ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

scholarly journals Application of laser induced breakdown spectroscopy (LIBS) for environmental, chemical, and biological sensing

2021 ◽  
Author(s):  
Holly VerMeulen ◽  
Jay Clausen ◽  
Ashley Mossell ◽  
Michael Morgan ◽  
Komi Messan ◽  
...  
Keyword(s):  
Optical Emission Spectroscopy ◽  
Military Training ◽  
Inductively Couple Plasma ◽  
Optical Emission ◽  
Laser Induced Breakdown Spectroscopy ◽  
Environmental Chemical ◽  
X Ray ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

The Army is interested in sensors capable of characterizing/monitoring the environment (battlefield or military training ranges) at proximal distances. Recently, we evaluated laser induced breakdown spectroscopy (LIBS) systems (hand-held, proximal, and bench top) for the characterization of metals (antimony, copper, lead, tungsten, and zinc) in soils obtained from military training ranges. We then compared the results to findings obtained with standard field and laboratory instrumentation for metals analysis -X-ray Fluorescence (XRF) and Inductively Couple Plasma- Optical Emission Spectroscopy (ICP-OES).

scholarly journals Investigation of compositional analysis and physical properties for Ni-Cr-Nb alloys using laser-induced breakdown spectroscopy

2021 ◽  
Vol 51 (3) ◽  
Author(s):  
Hussein Salloom ◽  
Tagreed Hamad
Keyword(s):  
Thermal Conductivity ◽  
Laser Energy ◽  
Plasma Temperature ◽  
Compositional Analysis ◽  
Spectral Lines ◽  
Laser Induced Breakdown Spectroscopy ◽  
Elemental Content ◽  
Empirical Formulas ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

In this work, laser-induced breakdown spectroscopy (LIBS) analysis is optimized for direct estimation of elemental composition, thermal conductivity and hardness for Ni-Cr-Nb alloys. These alloys were chosen with a variable elemental content of niobium and chromium. The influence of laser energy and shot numbers on measuring line intensity was investigated. Based on the ratio between two spectral lines, calibration curves were formed to estimate the element concentration and LIBS results were confirmed with related energy-dispersive X-ray spectroscopy (EDS) data. Hardness and thermal conductivity estimation using LIBS were done by measuring the ratio between two spectral lines, plasma excitation temperature and electron density for different samples. Semi-empirical formulas correlated hardness and thermal conductivity with plasma temperature were established.

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