Article
Geosciences, Multidisciplinary
Abbey Douglas, Gabor Kereszturi, Lauren N. Schaefer, Ben Kennedy
Summary: This study investigated the use of hyperspectral remote sensing to map surface hydrothermal rock alteration, with results showing the reliability of laboratory-based hyperspectral analytical methods but limitations in aerial hyperspectral data.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2022)
Article
Environmental Sciences
Carmine Apollaro, Ilaria Fuoco, Emanuela Gennaro, Letizia Giuliani, Gianluca Iezzi, Luigi Marini, Francesco Radica, Francesca Di Luccio, Guido Ventura, Giovanni Vespasiano, Daniel Alessi
Summary: The study focuses on four sites in the western sector of Lipari Island with active hydrothermal activity. The petrography and geochemistry of altered volcanic rocks were characterized, revealing two types of altered rocks: silicate-rich rocks and sulphate-rich rocks. The alteration minerals in nature match predictions from geochemical modeling, supporting the hypothesis that the modeled process is responsible for the advanced argillic alteration assemblage on Lipari Island.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Polymer Science
Nicholas T. H. Farr, Sameer F. Hamad, Euan Gray, Christopher M. Magazzeni, Fodio Longman, David E. J. Armstrong, Joel P. Foreman, Frederik Claeyssens, Nicola H. Green, Cornelia Rodenburg
Summary: The distribution of methylene and ether bridges affects the mechanical properties of phenolic resin. This study demonstrates the capability of a novel SEM technique, SEHI, to characterize and map these bridges at the nanoscale within the resin.
Article
Geochemistry & Geophysics
Jorge E. Morales-Leal, Eduardo Campos, Kalin Kouzmanov, Rodrigo Riquelme
Summary: This study investigates the mineralogical and geochemical characteristics of the advanced argillic (AA) alteration in the Potrerillos district, Atacama Desert, Chile. The results provide insights into the physicochemical parameters, composition, source, and evolution of the fluids that produced the AA alteration. Different precipitation environments with various sulfur sources and alunite group minerals have been defined. The temperature estimation for the hypogene alteration is 120-200 degrees C.
MINERALIUM DEPOSITA
(2023)
Article
Geochemistry & Geophysics
Gabor Kereszturi, Michael Heap, Lauren N. Schaefer, Herlan Darmawan, Frances M. Deegan, Ben Kennedy, Jean-Christophe Komorowski, Stuart Mead, Marina Rosas-Carbajal, Amy Ryan, Valentin R. Troll, Marlene Villeneuve, Thomas R. Walter
Summary: Volcano slope stability analysis is essential for volcanic hazard assessment and monitoring. This study developed a novel chemometric-based method using visible to shortwave infrared reflected light spectroscopy to estimate rock strength and porosity. The spectroscopic analysis provided a first order assessment of rock strength and alteration mineralogy, offering an accurate non-destructive way of assessing rock strength and porosity.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Chemistry, Physical
Nicolas Debons, Dounia Dems, Christophe Methivier, Christophe Calers, Antoine Miche, Thibaud Coradin, Carole Aime
Summary: Functionalization of nanomaterial surfaces is crucial for improving stability, tuning reactivity, and introducing specific properties. Mapping functional groups at nanometer scale is challenging, especially for organic groups and non-planar objects like nanoparticles. A strategy using chemically-modified gold colloids to map amine groups on silica particle surfaces is presented, showing correlation between spatial distribution of gold colloids and chemical state of silica particles as revealed by X-ray photoelectron spectroscopy. The strategy's potential for mapping organic groups at nanomaterial interfaces and its implications for biofunctional nano-objects are discussed.
APPLIED SURFACE SCIENCE
(2021)
Article
Multidisciplinary Sciences
Frances E. M. Lambert, Jan Ornik, Naja-Anissa Staats, Alexander Jaeckel, Goretti G. Hernandez-Cardoso, Jochen Taiber, Eva-Maria Stuebling, Benjamin Rudolph, Oliver Mack, Hans Portsteffen, Enrique Castro-Camus, Martin Koch
Summary: Over time, artworks may experience paint layer separation and air gaps, making it necessary for art conservators to perform paint layer consolidation interventions. This study utilized terahertz time-domain imaging to analyze a fifteenth-century wood panel painting before and after consolidation. The results showed that terahertz data can effectively determine the areas in need of consolidation and evaluate the success of the intervention in a non-destructive manner.
SCIENTIFIC REPORTS
(2022)
Editorial Material
Optics
Walker Peterson, Kotaro Hiramatsu, Keisuke Goda
Summary: Coherent Raman scattering microscopy enables high-contrast imaging of tissues and single cells based on molecular vibrations. However, conventional techniques face a trade-off between Raman spectral bandwidth, imaging speed, and image fidelity. This trade-off can be overcome using emerging computational tools such as compressive sensing and machine learning, even though it is currently challenging to address through optical design.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Timothy Brown, Philip James Blowey, Jack Henry, Adam Sweetman
Summary: The acquisition of dense, three-dimensional, force fields with intramolecular resolution via noncontact atomic force microscopy (NC-AFM) has significantly advanced our understanding of molecular and two-dimensional materials on an atomic scale. Previous intramolecular force mapping was limited to cryogenic temperatures, but this study demonstrates high-resolution, three-dimensional force mapping of a single organic molecule at room temperature by using semiconducting materials to inhibit molecular diffusion and creating robust tip apexes, along with feedforward correction to overcome thermal drift challenges. The results obtained are comparable to those acquired at low temperature, enabling quantitative analysis of the adsorption-induced changes in molecular geometry at the picometer level.
Article
Chemistry, Multidisciplinary
Gary Sean Cooney, David Talaga, Vicky Ury-Thiery, Yann Fichou, Yuhan Huang, Sophie Lecomte, Sebastien Bonhommeau
Summary: In this study, TERS was used to visualize the spatial distribution of adenine, protein secondary structure, and amino acids in single polyadenosine-induced tau fibrils. The findings provide insights into the incorporation of the polyadenosine cofactor in the fibril structure and its interaction with amino acids. TERS proves to be a powerful technique for studying cofactors in individual tau fibrils and their mode of interaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Analytical
Marcel Nachtmann, Daniel Feger, Sebastian Sold, Felix Wuehler, Stephan Scholl, Matthias Raedle
Summary: This publication presents a new method for non-contact, molecule-sensitive concentration mapping in vertical falling films using Raman spectroscopy. The results show clear spectroscopic differences between different components in the film, proving the feasibility of this technique for liquid mapping.
Article
Chemistry, Physical
Boogeon Choi, Gyouil Jeong, Hyun-Hang Shin, Zee Hwan Kim
Summary: The demand for visualizing the spatial distribution of chemical species based on vibrational spectra is rapidly increasing. Two vibrational nano-imaging techniques, scattering-type scanning near-field optical microscopy and tip-enhanced Raman scattering, face key challenges and recent breakthroughs. This Perspective highlights the current gap between general needs and achievable results.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Review
Chemistry, Multidisciplinary
Jia-Sheng Lin, Xiang-Dong Tian, Gang Li, Fan-Li Zhang, Yan Wang, Jian-Feng Li
Summary: The use of imaging technologies is crucial in understanding biological phenomena. Traditional imaging modalities lack the necessary spatial resolution for high-precision research and diagnosis in the biomedical field. Plasmon resonance, an interaction between light and matter, allows for intense electromagnetic fields and enhances various processes such as ablation, scattering, and photoluminescence. By combining spatially resolved capability with molecular spectrometry techniques, excellent imaging techniques have been developed for studying biological processes. This review provides an overview of plasmonics and discusses the working principles and achievable spatial resolutions of various plasmon-based imaging techniques.
CHEMICAL SOCIETY REVIEWS
(2022)
Article
Environmental Sciences
Hamed Gholizadeh, Michael S. Friedman, Nicholas A. McMillan, William M. Hammond, Kianoosh Hassani, Aisha Sams, Makyla D. Charles, DeAndre R. Garrett, Omkar Joshi, Robert G. Hamilton, Samuel D. Fuhlendorf, Amy M. Trowbridge, Henry D. Adams
Summary: In this study, airborne imaging spectroscopy was used to map sericea in the Tallgrass Prairie Preserve. The research investigated the remotely observable vegetation functional traits that contribute to distinguishing sericea from native species and developed a classification model to detect sericea. The results showed that certain functional traits, such as total carotenoids, chlorophyll a + b, and total nitrogen, were key factors in detecting sericea, with an overall accuracy of approximately 94%. This research demonstrates the importance of airborne remote sensing in mapping invasive plants and quantifying their functional traits.
REMOTE SENSING OF ENVIRONMENT
(2022)
Article
Environmental Sciences
Luis Guanter, Itziar Irakulis-Loitxate, Javier Gorrono, Elena Sanchez-Garcia, Daniel H. Cusworth, Daniel J. Varon, Sergio Cogliati, Roberto Colombo
Summary: The potential of PRISMA satellite for mapping methane emissions from fossil fuel production activities is evaluated in this study, with a matched-filter algorithm used to detect methane concentration enhancements in the shortwave infrared spectral region. The study also includes a simulation-based sensitivity analysis to assess the retrieval performance for different sites. The results show that surface brightness and homogeneity are key factors for detecting and quantifying methane plumes with PRISMA, with retrieval precision errors ranging from 61 to 197 parts-per-billion in the evaluated images.
REMOTE SENSING OF ENVIRONMENT
(2021)