Article
Chemistry, Multidisciplinary
Arthi Ravi, Amina Shijad, Kana M. Sureshan
Summary: The study introduces a method for synthesizing crystalline polysaccharide-mimics by topochemical polymerization, utilizing crystal engineering to design a glucose-mimicking monomer with azide and alkyne groups. The synthesized pseudostarch, formed through regiospecific TAAC polymerization in a single-crystal-to-single-crystal manner, exhibits better thermal stability compared to its amorphous form and various natural polysaccharides.
Article
Chemistry, Physical
Federico Caporaletti, Simone Capaccioli, Dimitrios Bessas, Aleksander I. Chumakov, Alessandro Martinelli, Giulio Monaco
Summary: The JG relaxation is closely connected to the structural relaxation in supercooled liquids, and investigating its microscopic properties is crucial for understanding the glass-transition. In this study, we used time-domain interferometry to probe the microscopic density fluctuations of the van der Waals glass-former cumene. Our results show that the molecules involved in the JG relaxation undergo a restricted motion, leading to local cage-breaking events at the characteristic time-scale for molecular re-orientations.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Materials Science, Multidisciplinary
Qing Du, Xiong-Jun Liu, Yihuan Cao, Qiaoshi Zeng, Hui Wang, Yuan Wu, Suihe Jiang, Xiaobin Zhang, Zhao-Ping Lu
Summary: In this study, the chemical dependence of thermally induced reentrant glass transition in (PdNi)(100-x)P-x MGs was systematically investigated. It was found that the reentrant glass transition in alloys with a P content of < 17 at% is suppressed with an increase in P. The composition dependence of the reentrant glass transition originates from the rearrangement of the metal-metalloid bond (i.e., Pd/Ni-P bonds) and the consequent short-range ordering to medium-range ordering.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Physical
Shintaro Nakagawa, Naoko Yoshie
Summary: Bottlebrush elastomers with dense side chain grafting on load-bearing network strands have unique mechanical properties. In this study, the microscopic structural changes of a model bottlebrush elastomer under uniaxial deformation were investigated using in situ small-angle X-ray scattering and tensile tests. The results showed significant strain stiffening and backbone chain alignment in the bottlebrush elastomer, which were not observed in similar side chain-free elastomers and gels.
Article
Materials Science, Multidisciplinary
Surendra Singh, J. Olamit, M. R. Fitzsimmons, J. D. Thompson, H. Jeen, A. Biswas
Summary: The dynamics and interaction of different electronic phases near the metal-to-insulator transition of the phase-separated (La0.5Pr0.5)0.625Ca0.375MnO3 (LPCMO) thin film were studied. Measurements of the in-plane angle-dependent remanence and coercivity field indicate an in-plane uniaxial magnetic anisotropy for the film. The correlation between FORC measurements, resistance relaxation, and macroscopic magnetic measurements suggests a fast reversal of electronic and magnetic phases and strong interaction of different phases for the LPCMO system.
Article
Chemistry, Multidisciplinary
Alejandro A. Krauskopf, Andrew M. Jimenez, Abdullah S. Altorbaq, Alejandro J. Muller, Sanat K. Kumar
Summary: It has been found that polymer crystallization can selectively place nanoparticles in the amorphous domains. By analyzing small-angle X-ray scattering data using correlation functions, it was observed that an increase in crystallization temperature leads to more nanoparticles in the amorphous domains and a linear scaling of contrast between nanoparticle-rich and polymer-rich domains with the repeating crystal-amorphous polymer structure.
Article
Chemistry, Physical
Sebastien E. Hadjadj, Carmen Gonzalez-Orellana, James Lawrence, Djuro Bikaljevic, Marina Pena-Diaz, Pierluigi Gargiani, Lucia Aballe, Jan Naumann, Miguel Aprimengel Nino, Michael Foerster, Sandra Ruiz-Gomez, Sangeeta Thakur, Ivar Kumberg, James M. Taylor, Jack Hayes, Jorge Torres, Chen Luo, Florin Radu, Dimas G. de Oteyza, Wolfgang Kuch, Jose Ignacio Pascual, Celia Rogero, Maxim Ilyn
Summary: The growth of magnetic 2D semiconductor FeBr2 has been widely studied, and the epitaxial growth on Au(111) substrate was investigated in this study. It was found that the single-layer FeBr2 exhibited different magnetic behavior compared to its bulk counterpart, which can be attributed to the modifications in the crystal structure due to the interaction with the substrate.
CHEMISTRY OF MATERIALS
(2023)
Article
Polymer Science
Xiao Cao, Li Peng, Zhijun Wang, Yongyan Pang, Xianbo Huang, Quan Chen
Summary: This study examines the linear viscoelasticity, elongational rheological behavior, and foamability of ionomer samples based on a commercial Surlyn sample. The LVE behavior can be predicted well by incorporating the activation energy for ionic dissociation into the sticky-double-reptation model. The degree of strain hardening exhibits a non-monotonous change under extensional flow, and the foamability is controlled by flowability and melt strength during elongational flow.
Article
Polymer Science
Anne-Sophie Robbes, Jacques Jestin, Florian Meneau, Florent Dalmas, Francois Boue, Fabrice Cousin
Summary: In this study, we conducted a detailed monitoring of the evolution of filler structure and polymer chain conformation in a nanocomposite during uniaxial stretching using SAXS and SANS techniques. The application of a magnetic field during processing of the nanocomposite resulted in a highly anisotropic filler structure before stretching. The structure of fillers evolved differently depending on whether the stretching was parallel or perpendicular to the chains of nanoparticles. The conformation of polymer chains was directly obtained through SANS and showed similar deformation to the reference PS matrix without fillers.
Article
Chemistry, Multidisciplinary
Florian A. Jung, Maximilian Schart, Lukas Buehrend, Elisabeth Meidinger, Jia-Jhen Kang, Bart-Jan Niebuur, Sina Ariaee, Dmitry S. Molodenskiy, Dorthe Posselt, Heinz Amenitsch, Constantinos Tsitsilianis, Christine M. Papadakis
Summary: Multiblock copolymers with charged blocks exhibit different self-assembly behavior in solutions and thin films, depending on the degree of ionization of the blocks. In solutions, the solubility of the P2VP block and the flexibility of the PDMAEMA block influence structure formation; while in thin films, the segregation strength is crucial for structure formation.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Ihor Cherniukh, Gabriele Raino, Thilo Stoeferle, Max Burian, Alex Travesset, Denys Naumenko, Heinz Amenitsch, Rolf Erni, Rainer F. Mahrt, Maryna I. Bodnarchuk, Maksym V. Kovalenko
Summary: Through precise structural engineering, perovskite nanocrystals are co-assembled with other nanocrystal materials to form a range of binary and ternary perovskite-type superlattices that exhibit superfluorescence. These ABO3 superlattices, as well as the binary NaCl and AlB2 superlattice structures that we demonstrate, exhibit a high degree of orientational ordering of the CsPbBr3 nanocubes. They also exhibit superfluorescence – a collective emission that results in a burst of photons with ultrafast radiative decay (22 picoseconds) that could be tailored for use in ultrabright (quantum) light sources.
Article
Chemistry, Physical
Vasileios Moschos, Antonela Ananiadou, George Floudas
Summary: 1-propanol/water mixtures exhibit structural and dynamical heterogeneity over the entire composition range. The behavior of water molecules is influenced by the degree of confinement by 1-propanol, leading to droplet arrangement or crystallization. When 1-propanol is the minority component, the structure and dynamics are dominated by the 1-propanol/water interface and the formation of hydrates.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Polymer Science
Xiaowen Gong, Hao Yin, Maolin Zhang, Zhengwei Lin, Xinyan Shi
Summary: In this study, resorcinol prepolymer (HT1005) was used to modify polynorbornene (PNB) by reacting with hexamethoxymethyl melamine (HMMM) to produce cured phenolic resin. The mechanical properties and shape memory performance of PNB composites were investigated using various characterization techniques. The addition of HT1005 and HMMM improved the phenolic resin network in PNB, enhancing mechanical properties but excessive HT1005 hindered dispersibility and limited the recovery of PNB molecular chains, while optimum amount resulted in excellent shape memory and mechanical properties of the composite material.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Physics, Multidisciplinary
Peco Myint, Karl F. Ludwig, Lutz Wiegart, Yugang Zhang, Andrei Fluerasu, Xiaozhi Zhang, Randall L. Headrick
Summary: In investigating the self-organized ion-beam nanopatterning of silicon using coherent x-ray scattering, a relationship similar to de Gennes narrowing is discovered. However, unlike the classic phenomenon, the dynamic surface exhibits a wide range of behaviors with compressed exponential relaxation at lengths corresponding to the dominant structural motif. This behavior is attributed to the morphological persistence of the self-organized surface ripple patterns.
PHYSICAL REVIEW LETTERS
(2021)
Article
Polymer Science
Hang Guo, Zhilong Hong, Dongmei Huang, Erjie Yang, Zhuangzhuang Zhu, Chenhao Zhao, Yun Dong, Bangjiao Ye, Hongjun Zhang, Liangbin Li
Summary: The structure-property relationship of the interlamellar amorphous phase in semicrystalline polymers has been a fundamental yet controversial topic in polymer physics. This study simplifies the mechanical coupling between the two phases and quantitatively characterizes the evolution of the amorphous structure and its connection to the mechanical behavior using advanced techniques.
Article
Chemistry, Physical
M. D. Ruiz-Martin, N. Qureshi, M. A. Gonzalez, J. Ollivier, B. Frick, B. Farago
Summary: In this study, the effect of water on the microscopic dynamics of 1-butyl-3-methylimidazolium tetrafluoroborate was systematically investigated using quasielastic neutron scattering. The results show that even small amounts of water can greatly accelerate diffusion mechanisms and relieve the confinement within ionic liquid nanodomains. Furthermore, the presence of two different water species was identified.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Engineering, Chemical
Andreas Schoenhals, Paulina Szymoniak, Mohamed A. Kolmangadi, Martin Boehning, Michaela Zamponi, Bernhard Frick, Markus Appel, Gerrit Guenther, Margarita Russina, Dmitry A. Alentiev, Maxim Bermeshev, Reiner Zorn
Summary: The study found that poly(tricyclononenes) with Si-substituted bulky side groups have high microporosity, making them potential candidates for active separation layers for gas separation membranes. The low temperature relaxation process involving methyl group rotation suggests that some methyl groups may be immobilized in their rotation due to steric hindrance.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Chemistry, Physical
Fumitaka Takeiri, Akihiro Watanabe, Kei Okamoto, Dominic Bresser, Sandrine Lyonnard, Bernhard Frick, Asad Ali, Yumiko Imai, Masako Nishikawa, Masao Yonemura, Takashi Saito, Kazutaka Ikeda, Toshiya Otomo, Takashi Kamiyama, Ryoji Kanno, Genki Kobayashi
Summary: Hydrogen transport in solids is crucial for sustainable energy societies. Practical hydrogen conductivity at intermediate temperatures remains a challenge. A K2NiF4-type Ba-Li oxyhydride is shown to exhibit temperature-independent hydrogen conductivity, which is important for energy and chemical conversion devices.
Article
Chemistry, Multidisciplinary
Frederik Philippi, Daniel Rauber, Kira Lieberkind Eliasen, Nathalie Bouscharain, Kristine Niss, Christopher W. M. Kay, Tom Welton
Summary: The optimization of viscosity in room temperature ionic liquids must consider both coulombic compaction and charge network interactions, as revealed by comparing the viscosity of charged and uncharged molecular mimics.
Article
Materials Science, Multidisciplinary
Damien Terebenec, Nicolas Bernier, Niccolo Castellani, Mathieu Bernard, Jean-Baptiste Jager, Martina Tomelleri, Jessy Paterson, Marie-Claire Cyrille, Nguyet-Phuong Tran, Valentina M. Giordano, Francoise Hippert, Pierre Noe
Summary: Innovative nanocomposites consisting of [(GeTe)(4 nm/)C-1 nm](10) multilayers deposited by magnetron sputtering are integrated in phase-change memory (PCM) test devices with a wall structure. The programming current required to reach the high resistance state of the ML devices decreases after annealing at 425 degrees C, which can be attributed to the reduction of the amorphized volume. STEM imaging and spectroscopic analysis confirm this correlation.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Multidisciplinary Sciences
Fabrizia Foglia, Bernhard Frick, Manuela Nania, Andrew G. Livingston, Joao T. Cabral
Summary: The authors use neutron spectroscopy to investigate the effect of membrane nanostructure on water transport in polymeric membranes. They find that water diffusion in polyamide membranes exhibits multimodal characteristics, including translational diffusion, long-range mode, and localized mode. The study also reveals rotational relaxations in the polyamide matrix that are consistent with water diffusion.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Birte Riechers, Lisa A. Roed, Saeed Mehri, Trond S. Ingebrigtsen, Tina Hecksher, Jeppe C. Dyre, Kristine Niss
Summary: The noncrystalline glassy state of matter is important in materials science and offers unique properties. However, it undergoes physical aging due to being out of equilibrium. The existence of a material time is validated and physical aging can be predicted using fluctuation-dissipation theorem and computer simulations.
Article
Chemistry, Physical
Kristine Niss
Summary: Traditionally, the aging rate of glasses has been modeled based on temperature and fictive temperature, while density is not explicitly included. However, in equilibrium, the relaxation rate of glasses depends on both temperature and density. This paper presents a generalization of the fictive temperature concept and proposes a density scaling conjecture for aging glasses.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Mechanics
Mathias Mikkelsen, Kira L. Eliasen, Niclas Lindemann, Kevin Moch, Roland Bohmer, Hossein Ali Karimi-Varzaneh, Jorge Lacayo-Pineda, Bo Jakobsen, Kristine Niss, Tage Christensen, Tina Hecksher
Summary: This article presents recent advances in the piezoelectric shear gauge (PSG) technique, including optimized data extraction and simplified measuring cell design. The technique is particularly suitable for measuring viscous liquids near their glass transition temperature.
JOURNAL OF RHEOLOGY
(2022)
Article
Multidisciplinary Sciences
Francesco Dallari, Alessandro Martinelli, Federico Caporaletti, Michael Sprung, Giacomo Baldi, Giulio Monaco
Summary: The X-ray-induced fluidization of SiO2 glass was studied using X-ray photon correlation spectroscopy. Atomic displacements reaching a few nanometers below the glass transition temperature were observed after the absorption of X-rays. At absorbed doses typical of X-ray-based experiments, the atomic displacements showed a hyperdiffusive behavior and followed a heavy-tailed Levy stable distribution. This behavior is attributed to the generation of X-ray-induced point defects, which create a dynamically fluctuating potential landscape and provide a microscopic understanding of the fluidization process.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Materials Science, Multidisciplinary
Rebecca Chahine, Martina Tomelleri, Jessy Paterson, Mathieu Bernard, Nicolas Bernier, Francois Pierre, Denis Rouchon, Audrey Jannaud, Cristian Mocuta, Valentina M. Giordano, Francoise Hippert, Pierre Noe
Summary: Engineering of chalcogenide phase-change materials at the nanoscale can enhance the performance of ultimate size memory devices and reduce power consumption. Deposition of multilayers enables control of nanostructure and interfaces between phase-change material and C phase, with promising applications in memory devices.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Acoustics
L. Foglia, R. Mincigrucci, A. A. Maznev, G. Baldi, F. Capotondi, F. Caporaletti, R. Comin, D. De Angelis, R. A. Duncan, D. Fainozzi, G. Kurdi, J. Li, A. Martinelli, C. Masciovecchio, G. Monaco, A. Milloch, K. A. Nelson, C. A. Occhialini, M. Pancaldi, E. Pedersoli, J. S. Pelli-Cresi, A. Simoncig, F. Travasso, B. Wehinger, M. Zanatta, F. Bencivenga
Summary: Collective lattice dynamics play a critical role in determining the properties of condensed matter. The extreme ultraviolet transient grating (EUV TG) approach allows access to a previously inaccessible length-scale, providing valuable insights into the thermoelastic properties of matter. This technique has significant implications for fundamental physics and future technology development.
Article
Materials Science, Multidisciplinary
E. Alfinelli, F. Caporaletti, F. Dallari, A. Martinelli, G. Monaco, B. Ruta, M. Sprung, M. Zanatta, G. Baldi
Summary: The atomic displacements induced by a low energy x-ray beam in pure boron oxide and sodium silicate glasses were studied using x-ray photon correlation spectroscopy. The initial glass was completely transformed into a new amorphous state under the beam, which remained stable. The restructuring of the new phase showed exponential relaxation similar to macroscopic measurements in the high-temperature supercooled liquid, suggesting a higher energy minimum. The observed dynamics had a temperature dependence, indicating thermal activation of defect creation.
Article
Materials Science, Multidisciplinary
A. Revelli, M. Moretti Sala, G. Monaco, M. Magnaterra, J. Attig, L. Peterlini, T. Dey, A. A. Tsirlin, P. Gegenwart, T. Froehlich, M. Braden, C. Grams, J. Hemberger, P. Becker, P. H. M. van Loosdrecht, D. I. Khomskii, J. van den Brink, M. Hermanns, M. Grueninger
Summary: Ba3InIr2O9 is a promising candidate for quantum spin-liquid behavior and exhibits magnetism from spin-orbit entangled quasimolecular moments. Our study reveals its unique electronic states and excitations through various experimental and computational methods.
Article
Materials Science, Multidisciplinary
G. Pintori, G. Baldi, F. Dallari, A. Martinelli, M. Sprung, G. Monaco
Summary: This study investigates the atomic dynamics induced by hard x-rays in oxide glasses using X-ray photon correlation spectroscopy. The research finds that the product of the x-ray dose rate per atom and the decay time of the density correlation function is a sample-dependent parameter sensitive to the network connectivity of the glass, providing bonding information even in cases where the material is perturbed by x-rays.