Characterization of Polystyrene (1 kDa) Functionalized with a Dimethyl- phenylsilane Endgroup by TOF-SIMS: Effect of Post-Ionization Using a Nonresonant Multiphoton Technique

1996 ◽  
Vol 4 (4) ◽  
pp. 381-386
Author(s):  
A. M. Belu ◽  
M. O. Hunt ◽  
J. M. DeSimone ◽  
R. W. Linton
Keyword(s):  
Tof Sims

scholarly journals Chemical Evaluation of Eumelanin Maturation by ToF-SIMS and Alkaline Peroxide Oxidation HPLC Analysis

2020 ◽  
Vol 22 (1) ◽  
pp. 161
Author(s):  
Martin Jarenmark ◽  
Peter Sjövall ◽  
Shosuke Ito ◽  
Kazumasa Wakamatsu ◽  
Johan Lindgren
Keyword(s):  
Molecular Structure ◽  
Secondary Ion Mass Spectrometry ◽  
Chemical Characterization ◽  
Experimental Treatment ◽  
Negative Ion ◽  
Pressure Treatment ◽  
Peroxide Oxidation ◽  
Specific Chemical ◽  
Tof Sims

Residual melanins have been detected in multimillion-year-old animal body fossils; however, confident identification and characterization of these natural pigments remain challenging due to loss of chemical signatures during diagenesis. Here, we simulate this post-burial process through artificial maturation experiments using three synthetic and one natural eumelanin exposed to mild (100 °C/100 bar) and harsh (250 °C/200 bar) environmental conditions, followed by chemical analysis employing alkaline hydrogen peroxide oxidation (AHPO) and time-of-flight secondary ion mass spectrometry (ToF-SIMS). Our results show that AHPO is sensitive to changes in the melanin molecular structure already during mild heat and pressure treatment (resulting, e.g., in increased C-C cross-linking), whereas harsh maturation leads to extensive loss of eumelanin-specific chemical markers. In contrast, negative-ion ToF-SIMS spectra are considerably less affected by mild maturation conditions, and eumelanin-specific features remain even after harsh treatment. Detailed analysis of ToF-SIMS spectra acquired prior to experimental treatment revealed significant differences between the investigated eumelanins. However, systematic spectral changes upon maturation reduced these dissimilarities, indicating that intense heat and pressure treatment leads to the formation of a common, partially degraded, eumelanin molecular structure. Our findings elucidate the complementary nature of AHPO and ToF-SIMS during chemical characterization of eumelanin traces in fossilized organismal remains.

4A combined XPS/ToF-SIMS approach for the 3D compositional characterization of Zr-based conversion of galvanized steel

2021 ◽  
pp. 150166
Author(s):  
Vanina Cristaudo ◽  
Kitty Baert ◽  
Priya Laha ◽  
Mary Lyn Lim ◽  
Elizabeth Brown-Tseng ◽  
...  
Keyword(s):  
Galvanized Steel ◽  
Tof Sims ◽  
Compositional Characterization

Characterization of cell cultures with ToF-SIMS and laser-SNMS

2002 ◽  
Vol 34 (1) ◽  
pp. 63-66 ◽  
Author(s):  
M. Fartmann ◽  
S. Dambach ◽  
C. Kriegeskotte ◽  
H. P. Wiesmann ◽  
A. Wittig ◽  
...  
Keyword(s):  
Cell Cultures ◽  
Tof Sims

Characterization of a range of alkyl-bonded silica HPLC stationary phases: XPS and ToF-SIMS studies

1994 ◽  
Vol 21 (5) ◽  
pp. 263-273 ◽  
Author(s):  
V. A. Brown ◽  
D. A. Barrett ◽  
P. N. Shaw ◽  
M. C. Davies ◽  
H. J. Ritchie ◽  
...  
Keyword(s):  
Stationary Phases ◽  
Tof Sims

scholarly journals Surface Characterization of Polymer Blends by XPS and ToF-SIMS

Materials ◽  
2016 ◽  
Vol 9 (8) ◽  
pp. 655 ◽  
Author(s):  
Chi Chan ◽  
Lu-Tao Weng
Keyword(s):  
Polymer Blends ◽  
Surface Characterization ◽  
Tof Sims

ToF-SIMS characterization of modified starch on fine and LWC base papers

2007 ◽  
Vol 22 (1) ◽  
pp. 131-135 ◽  
Author(s):  
Jyrki Juhanoja ◽  
Heidi Fagerholm ◽  
Sari Hyvärinen ◽  
Soili Peltonen ◽  
Kirsi Kataja ◽  
...  
Keyword(s):  
Modified Starch ◽  
Tof Sims

scholarly journals Applications of ToF-SIMS in surface chemistry analysis of lignocellulosic biomass: A review

BioResources ◽  
2016 ◽  
Vol 11 (2) ◽  
pp. 5581-5599
Author(s):  
Hong Yan Mou ◽  
Shubin Wu ◽  
Pedro Fardim
Keyword(s):  
Surface Chemistry ◽  
Lignocellulosic Biomass ◽  
Secondary Ion Mass Spectrometry ◽  
Critical Factor ◽  
Tof Sims ◽  
Biomass Components ◽  
Current Article ◽  
Sims Analysis ◽  
Secondary Ion

Time-of-flight secondary-ion mass spectrometry (ToF-SIMS) is an advanced surface-sensitive technique that can provide both spectral and imaging information about materials. Recently, ToF-SIMS has been used for advanced studies of lignocellulosic biomass. In the current article, the application of ToF-SIMS to the characterization of the surface chemical composition and distribution of biomass components in lignocelluloses is reviewed. Moreover, extended applications of ToF-SIMS in the study of pretreatments, modification of biomaterials, and enzyme activity of lignocellulosic materials are presented and discussed. Sample preparation prior to ToF-SIMS analysis and subsequent interpretation of results is a critical factor in ensuring reliable results. The focus of this review is to give a comprehensive understanding of and offer new hints about the effects of processing conditions on the surface chemistry of lignocellulosic biomass.

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