Article
Food Science & Technology
Sumaiya Shomaji, Naren Vikram Raj Masna, David Ariando, Shubhra Deb Paul, Kelsey Horace-Herron, Domenic Forte, Soumyajit Mandal, Swarup Bhunia
Summary: Dyeing vegetables with harmful compounds has become a concerning public health issue in recent years, as excessive consumption of dyed vegetables can lead to severe health hazards such as cancer. This study validates the presence and quantity of dye-based adulteration in vegetables using proton nuclear magnetic resonance (NMR) technology, and proposes a low-cost detection method that can be used in various stages of the produce supply chain.
Review
Chemistry, Multidisciplinary
Dorothea Wisser, Martin Hartmann
Summary: NMR spectroscopy of xenon is a powerful method for probing pore sizes and structures in functional and catalytic materials, providing insights into hierarchical structures. This technique has both possibilities and limitations, as highlighted in recent works.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Polymer Science
Jonathan Cali, Weiguo Hu, Everett Kysor, Olaf Kohlmann
Summary: The aging behavior of polypropylene random copolymer (PP-RCP) reactor powder samples was studied using NMR relaxometry, revealing an increase in crystallinity and a decrease in segmental mobility of the interfacial phase during aging. There was a strong correlation between the population of the amorphous component and the T-2 relaxation time of the interfacial component, potentially due to secondary crystallization of the gamma form on the lateral surface of the scaffold crystallites during ambient temperature aging.
Article
Chemistry, Multidisciplinary
Hideki Hashimoto, Yuki Fujita, Koji Yazawa, Hidetaka Asoh
Summary: Porous-type anodic amorphous alumina is an important functional material with heat-induced local structural variations. The incorporation of different anions (phosphate, oxalate, sulfate) in amorphous alumina resulted in distinctive changes in the average coordination number. The findings contribute to the understanding of physical and chemical property changes and structural features of intermediate oxides that cannot form glass.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Polymer Science
Zuzanna Malyszek, Jacek Lewandowicz, Joanna Le Thanh-Blicharz, Katarzyna Walkowiak, Przemyslaw Lukasz Kowalczewski, Hanna Maria Baranowska
Summary: This study analyzed the impact of physically or chemically modified starch on the molecular dynamics of water using LF NMR, finding that different types of starch modifications affect the stability and emulsifying properties of emulsions, with physically modified starch exhibiting good emulsifying properties while acetylated starch does not exhibit the same properties.
Article
Engineering, Biomedical
Dion G. Thomas, Yu-Chieh Tzeng, Petrik Galvosas, Freya G. Harrison, Mary J. Berry, Paul D. Teal, Sean D. Galvin, Sergei I. Obruchkov
Summary: Objective: A single-sided magnet system is developed for measuring Magnetic Resonance relaxation and diffusion parameters. Methods: This system uses an array of permanent magnets to optimize magnet positions and produce a homogeneous B-0 magnetic field that can project into a sample. Results: The magnet produces a 0.2 T field and can measure T-1, T-2, and ADC parameters. In-vivo studies show its potential for non-invasive measurements in the brain, such as monitoring T-2 during cerebral hypoxia.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Yongqiang Li, Yi Xiao, Quan Tao, Mengmeng Yu, Li Zheng, Siwei Yang, Guqiao Ding, Hui Dong, Xiaoming Xie
Summary: A magnetic sensor utilizing magnetic graphene quantum dots and fluoride anions for ultra-sensitive detection was developed in this study, with an optimized method achieving a detection limit of 10 nmol/L. The key factors responsible for the change in relaxation time of magnetic GQDs in the presence of fluoride ions were revealed, indicating important implications for the development of magnetic probes and contrast agents for magnetic resonance imaging.
CHINESE CHEMICAL LETTERS
(2021)
Article
Geosciences, Multidisciplinary
P. Conte, V Ferro
Summary: The study uses Fast Field Cycling Nuclear Magnetic Resonance to analyze hydrological connectivity inside the soil, showing that soil structure and texture influence connectivity, with high structural connectivity corresponding to better functional connectivity.
Article
Materials Science, Paper & Wood
Matthew C. Young, Madison L. Nelson, Dylan S. Cousins, David B. Hodge, Joseph D. Seymour
Summary: Nuclear magnetic resonance (NMR) relaxometry is used to directly measure water adsorption in anatomical fractions of corn stover. Multiple water populations are observed and varied with anatomical fraction and water adsorption. NMR relaxation time measurements are used to calculate thermodynamic properties and determine adsorption interaction strength. The ratio of T-1/T-2 provides information about the surface energy and surface diffusive mobility of the water adsorbate.
Review
Radiology, Nuclear Medicine & Medical Imaging
Charit Tippareddy, Walter Zhao, Jeffrey L. Sunshine, Mark Griswold, Dan Ma, Chaitra Badve
Summary: Magnetic resonance fingerprinting is an evolving quantitative MRI framework capable of simultaneously producing multiple high-resolution property maps. Despite being a relatively new technology, MRF has rapidly developed for various clinical applications such as brain tumor characterization and prostate cancer characterization.
EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING
(2021)
Article
Engineering, Biomedical
Frederik Dreyer, Qing Yang, Belal Alnajjar, Daniel Kruger, Bernhard Blumich, Jens Anders
Summary: This article presents a portable NMR relaxometry system optimized for the point-of-care analysis of body liquids, demonstrating excellent concentration sensitivity and making it an ideal candidate for future biomarker detection.
IEEE TRANSACTIONS ON BIOMEDICAL CIRCUITS AND SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Maria Enrica Di Pietro, Mariagrazia Tortora, Cettina Bottari, Greta Colombo Dugoni, Roberto Vittorio Pivato, Barbara Rossi, Marco Paolantoni, Andrea Mele
Summary: The study found that hydration affects the strength and distribution of hydrogen bonds, leading to changes in the structure of different deep eutectic solvents. Choline acetate solvents undergo a breakage of DES-DES interactions at low water concentrations, while Choline chloride:urea maintains its structure.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Benjamin Henninger, Michaela Plaikner, Heinz Zoller, Andre Viveiros, Stephan Kannengiesser, Werner Jaschke, Christian Kremser
Summary: This study evaluated the feasibility of using a 3D-multiecho-Dixon sequence and its improved version for MR quantification of hepatic iron, showing both sequences to be reliable and comparable to established relaxometry methods.
EUROPEAN RADIOLOGY
(2021)
Article
Thermodynamics
Moises Martin-Garrido, Sagrario Martinez-Ramirez
Summary: Calcium silicate hydrate gel (C-S-H) was synthesized using the double decomposition method for its simplicity and quickness. Analysis using various spectroscopy methods showed changes in the gel structure over time, including polymerization and a decrease in the Ca/Si ratio. The DTA/TG/MS analysis revealed a mass loss due to CO2 adsorption on the gel at temperatures below 400 degrees C.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2021)
Article
Construction & Building Technology
Ryo Kurihara, Ippei Maruyama
Summary: The specific surface areas of sealed-cured hardened cement pastes (HCP) were evaluated using three types of Portland cement and two different water-to-cement ratios. The results showed that the total surface area measured by 1H NMR was consistently 2-2.5 times larger than that measured by water vapor BET. This difference is attributed to the local stacking of C-S-H layers.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Forestry
Robin Adey-Johnson, J. Paul Mclean, Jan Van den Bulcke, Joris Van Acker, Peter J. McDonald
Article
Education, Scientific Disciplines
David A. Faux, Mayank Shah, Christopher Knapp
AMERICAN JOURNAL OF PHYSICS
(2020)
Article
Construction & Building Technology
Peter J. McDonald, Ors Istok, Magdalena Janota, Agata M. Gajewicz-Jaromin, David A. Faux
CEMENT AND CONCRETE RESEARCH
(2020)
Article
Construction & Building Technology
Robert Schulte Holthausen, Peter J. McDonald
CEMENT AND CONCRETE RESEARCH
(2020)
Editorial Material
Education, Scientific Disciplines
David A. Faux, Janet Godolphin
AMERICAN JOURNAL OF PHYSICS
(2021)
Article
Education, Scientific Disciplines
David A. Faux, Janet Godolphin
Summary: This article emphasizes the importance of digital computation in scientific endeavors and university physics education, discussing the categorization of issues in floating-point representation and their impact on the accuracy of scientific results. Suggestions are made for curriculum enhancement and project-style investigations suitable for undergraduate physics students to reinforce learning in this area.
AMERICAN JOURNAL OF PHYSICS
(2021)
Article
Construction & Building Technology
Peter J. McDonald, Miryea N. Borg, David A. Faux
Summary: A lattice Boltzmann modelling framework is described for exploring water sorption in cement, coupled to a dynamic model of cement hydrate microstructure. The first simulations using the model show good qualitative agreement with experimental results in extracting transport and microstructural relaxation parameters. Limitations of the methodology are discussed.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Physics, Multidisciplinary
David A. Faux, Arifah A. Rahaman, Peter J. McDonald
Summary: A probability density function describing the angular evolution of a fixed-length atom-atom vector as a Le 'vy rotor is derived with the Levy parameter alpha and a rotational time constant tau. Molecular dynamics simulation of water validates the function for intramolecular 1H-1H dynamics, showing that water's rotational dynamics are approximately Brownian at short time intervals and become increasingly anomalous at longer intervals due to hydrogen-bond breaking. The Levy rotor model estimates that intramolecular contribution to the longitudinal NMR relaxation rate R1,intra accounts for 65% 17% of water's overall relaxation rate at room temperature.
PHYSICAL REVIEW LETTERS
(2021)
Article
Computer Science, Software Engineering
Remi Kogon, David Faux
Summary: The analysis of Fast Field Cycling-Nuclear Magnetic Resonance dispersion curves provides fundamental information about the dynamics of fluid protons within a confined environment and the structure of porous media. A software called 3TM, based on the 3-Tau model, is developed to facilitate the comparison of different models and promote its application in various types of porous media.
Article
Biochemistry & Molecular Biology
Mihai M. Rusu, David Faux, Ioan Ardelean
Summary: The hydration process of Portland cement, specifically the induction period, is not fully understood. To contribute to the understanding of this process, the hydration of two cement samples (simple cement paste and calcium nitrate-containing paste) was compared using low-field nuclear magnetic resonance (NMR) relaxometry techniques. The results showed that the capillary pore water is not consumed during the induction period and that the presence of calcium nitrate shortens this stage. Furthermore, the surface-to-volume ratio of the capillary pores continuously increases, even during the induction period, and this increase is faster in the presence of calcium nitrate. The desorption time of water molecules from the surface also increases in the presence of calcium nitrate.
Article
Chemistry, Applied
Remi Kogon, David Faux, Ali Assifaoui, Philippe Bodart
Summary: Fast field cycling (FFC) nuclear magnetic resonance (NMR) relaxometry is used to study an anisotropic polygalacturonate hydrogel formed by the diffusion of calcium ions from an external reservoir. The NMR relaxation process is dominated by the interaction of proton spins between water molecules located at polymer interfaces and in nanoporous spaces. FFC NMR experiment provides dispersion (NMRD) curves that are highly sensitive to the dynamics of the protons at the surfaces.
CARBOHYDRATE POLYMERS
(2023)
Article
Physics, Fluids & Plasmas
David A. Faux, Ors Istok, Arifah A. Rahaman, Peter J. McDonald, Eoin McKiernan, Dermot F. Brougham
Summary: A Brownian shell model is proposed to describe the random rotational motion of a uniform particle density spherical shell, and it is validated by molecular dynamics simulations. The model is applied to proton spin rotation in aqueous paramagnetic ion complexes, and an expression for the Larmor-frequency-dependent nuclear magnetic resonance spin-lattice relaxation rate T1-1(co) is obtained. The Brownian shell model significantly improves existing particle-particle dipolar models without adding complexity, allowing for fits to experimental T-1 1(co) dispersion curves without arbitrary scaling parameters.