Article
Chemistry, Multidisciplinary
Elena H. Sanchez, Marianna Vasilakaki, Su Seong Lee, Peter S. Normile, Mikael S. Andersson, Roland Mathieu, Alberto Lopez-Ortega, Benoit P. Pichon, Davide Peddis, Chris Binns, Per Nordblad, Kalliopi Trohidou, Josep Nogues, Jose A. De Toro
Summary: Dense systems of magnetic nanoparticles can exhibit collective behavior, and it remains unclear whether the transition temperature is influenced by particle anisotropy or determined by interparticle dipolar interactions. Additionally, the minimum ratio of dipole-dipole interaction to nanoparticle anisotropy energies necessary for the crossover from individual to collective behavior is unknown. This study investigates particle assemblies with varying anisotropy and finds a threshold value to suppress collective behavior. The findings have practical applications in predicting the behavior of interacting particle assemblies.
Article
Chemistry, Multidisciplinary
Will R. Henderson, Guancen Liu, Khalil A. Abboud, Ronald K. Castellano
Summary: The supramolecular polymerization of 2,11-dithia[3.3]paracyclophanes is achieved through self-complementary intermolecular and transannular amide hydrogen bonding, resulting in an enhanced n -> pi* interaction. Experimental data and computational investigations support the strengthening of this interaction.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Chengxi Li, Kang Huang, Chen Xiao, Yonghong Shi, Pengfei Duan
Summary: In this study, a vortex-assisted chiral supramolecular polymerization process is proposed to generate chiral polymers from achiral monomers. The mechanism of symmetry-breaking is systematically investigated, showing that highly ordered assemblies can be formed as the initial chiral nuclei through increasing supersaturation. The study concludes that chiral assemblies in the nucleation stage possess low energy barrier and can be fractured and replicated by the vortex, leading to the evolvement into final chiral polymers.
Article
Physics, Multidisciplinary
Xiang Yu, Yan Mi, Li-Chen Wang, Zheng-Rui Li, Di-An Wu, Ruo-Shui Liu, Shu-Li He
Summary: This study synthesized single cubic spinel structural Zn0.3Fe2.7O4 magnetic nanoparticles coated with SiO2 shell, and investigated the change in SLP values of the nanoparticles at different solution concentrations under an AC magnetic field. The research findings provide guidance for better prediction and control of the magnetic hyperthermia performance of materials in clinical applications.
Article
Chemistry, Multidisciplinary
Pelayo Garcia-Acevedo, Manuel A. Gonzalez-Gomez, Angela Arnosa-Prieto, Lisandra de Castro-Alves, Yolanda Pineiro, Jose Rivas
Summary: Challenging magnetic hyperthermia (MH) applications require precise determination of magnetic properties in order to maximize heat release. In this study, a mean-field energy barrier model is proposed and used to determine the effective anisotropy constant (K-eff) of a model system of magnetic nanoparticles. The results show that the K-eff values are independent of the specific spacing shell thicknesses and close to bulk magnetite/maghemite values.
Review
Chemistry, Multidisciplinary
Rahul Singh, Saurabh Pathak, Komal Jain, Noorjahan, Sang-Koog Kim
Summary: This article mainly focuses on the correlation between the thermal and rheological properties of NMFs. It discusses the background, stability, and factors affecting the properties of NMFs, introduces ferrohydrodynamic equations to explain the rheological behavior and relaxation mechanism, and summarizes different theoretical and experimental models explaining the thermal characteristics of NMFs. Understanding the correlation between the thermal characteristics of NMFs and their rheological properties helps develop cooling systems with improved performance.
Article
Chemistry, Multidisciplinary
Alessio Gabbani, Andrea Taddeucci, Marco Bertuolo, Francesco Pineider, Laura Antonella Aronica, Lorenzo Di Bari, Gennaro Pescitelli, Francesco Zinna
Summary: Magnetic circular dichroism can elucidate the molecular interactions and structural parameters of organic chiral materials, making it a valuable tool for studying supramolecular order and structure-property relationships.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Engineering, Electrical & Electronic
Tao Xu, Huiping Liu, Rongjun Zhao, Linjie Yuan, Zewei Zhu, Xi Chen, Haoqin Hou, Xinwen Peng
Summary: Polymer film capacitors cannot meet the increasing demand for high-temperature (> 125 degrees C) applications in the rapid development of new energy. In order to develop high-temperature-resistant polymer dielectrics, a novel polyimide containing porphyrin units (PI-a) was prepared. High-performance polyimide dielectrics were developed by mixing PI-a and PI-b, resulting in a polyimide blend with excellent properties and high energy storage density. These polyimide blends can extend the applications of film capacitors at high temperature.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Nanning Petersen, Sebastian Meyer, Stefan Heinze
Summary: The study shows that the magnetic properties of an Fe monolayer on a W(001) surface can be modified by an additional 4d transition-metal overlayer, leading to different magnetic ground states. Spin-orbit coupling plays a significant role in influencing the strength and effects of the magnetic properties.
Article
Nanoscience & Nanotechnology
Cyriaque Genet
Summary: Optical forces play a crucial role in physical processes and are commonly used in laboratories to manipulate matter. Recent research has uncovered new forms of optical forces that emerge when a chiral system interacts with a chiral light field. These forces possess unique properties, such as enantioselectivity, and have the potential for applications in chiral separation and quantum-level control of chiral systems. This Perspective highlights recent advances in this field, showcasing the strong interaction between theory and experiments.
Article
Chemistry, Multidisciplinary
Siyang Wang, Marek W. Urban
Summary: This study presents a novel approach to achieve self-healable properties in thermoplastic copolymers through utilizing dipolar interactions. By controlling the intramolecular dipolar forces, the mechanical integrity and sustainability of materials can be enhanced. This method not only enables self-healing of materials, but also provides new opportunities for designing self-healable commodity thermoplastics.
Article
Chemistry, Multidisciplinary
Michael Reggelin, Stefan Immel
Summary: The study investigates the impact of vibrational analysis on the accuracy of back-calculating RDCs from molecular models, and the effects of thermal motions on the differentiability of diastereomers.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Xian Zhang, Xucai Kan, Min Wang, Rui Rao, Ganhong Zheng, Meiling Wang, Yongqing Ma
Summary: The study found that the effects of interparticle dipolar interaction, exchange coupling, and magnetic anisotropy on magnetic properties vary in different temperature regions, and some influencing factors do not exhibit monotonic changes as commonly believed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Zijian Gu, Wenyue Ma, Jun Feng, Zhaoyang Liu, Bin Xu, Wenjing Tian
Summary: Circularly polarized luminescence (CPL) switching was achieved by precisely tuning supramolecular interactions and unveiling the mechanism of supramolecular chirality inversion. LGCP assembly driven by hydrogen bonding showed right CPL, while LGP assembly driven by π-π interaction led to left CPL. Significant CPL switching was observed from LGCP/OFN assemblies due to the alteration of the dominating interaction, while LGP/OFN assemblies exhibited minimum CPL variation. This work provides a feasible strategy for efficient modulation of chiroptical properties in multiple component supramolecular systems and offers possibilities for exploring the mechanism of chirality inversion in supramolecular assemblies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Anjan Bedi, Amit Manor Armon, Yael Diskin-Posner, Benny Bogosalvsky, Ori Gidron
Summary: The properties of pi-conjugated oligomers and polymers can be controlled by side group engineering, main chain engineering, or conformational engineering. This study proposes a different approach to conformational engineering by using a tether of varying lengths to control the twist of the aromatic units in the backbone. The results show that the optical and electronic properties of pi-conjugated systems are influenced by the length and twist angle of the backbone, and the twisted oligomers exhibit chiral amplification.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Kai Bagschik, Jochen Wagner, Ralph Buss, Matthias Riepp, Andre Philippi-Kobs, Leonard Mueller, Jens Buck, Florian Trinter, Frank Scholz, Joern Seltmann, Moritz Hoesch, Jens Viefhaus, Gerhard Gruebel, Hans Peter Oepen, Robert Froemter
Article
Physics, Multidisciplinary
Marielle J. Meijer, Juriaan Lucassen, Oleg Kurnosikov, Henk J. M. Swagten, Bert Koopmans, Reinoud Lavrijsen, Fabian Kloodt-Twesten, Robert Froemter, Rembert A. Duine
PHYSICAL REVIEW LETTERS
(2020)
Article
Optics
Kai Bagschik, Michael Schneider, Jochen Wagner, Ralph Buss, Matthias Riepp, Andre Philippi-Kobs, Leonard Mueller, Wojciech Roseker, Florian Trinter, Moritz Hoesch, Jens Viefhaus, Stefan Eisebitt, Gerhard Gruebel, Hans Peter Oepen, Robert Froemter
Article
Chemistry, Multidisciplinary
Marielle J. Meijer, Juriaan Lucassen, Rembert A. Duine, Henk J. M. Swagten, Bert Koopmans, Reinoud Lavrijsen, Marcos H. D. Guimaraes
Article
Materials Science, Multidisciplinary
Tim Anlauf, Marta Prada, Stefan Freercks, Bojan Bosnjak, Robert Froemter, Jonas Sichau, Hans Peter Oepen, Lars Tiemann, Robert H. Blick
Summary: The lattice of magnetic nanodots enhances electron spin polarization in monolayer graphene via carrier exchange. Probing spin polarization through resistively detected electron spin resonance, resonance amplification is observed mediated by the nanodots. Each nanodot locally injects surplus of spin-polarized carriers into graphene, generating nonequilibrium electron spin polarization at macroscopic lengths when the interdot distance is comparable or smaller than the spin diffusion length.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Applied
Olga Lozhkina, Robert M. Reeve, Robert Froemter, Mathias Klaeui
Summary: Periodical wire-width modulation can effectively suppress the Walker breakdown in confined wires, maintaining the spin structure of domain walls. This approach is crucial for expanding the operating range of devices and reducing stochasticity in domain wall propagation.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Multidisciplinary
Fabian Kammerbauer, Frank Freimuth, Robert Froemter, Yuriy Mokrousov, Mathias Klaeui
Summary: The Dzyaloshinskii-Moriya interaction (DMI) is crucial in the design of advanced spintronic devices, enabling the stabilization of domain walls and topologically non-trivial magnetic textures. This review focuses on the potential to manipulate DMI through electrical fields and currents, offering post-growth control over the sign and strength of DMI. The effects of currents and fields are discussed from both a theoretical and experimental perspective.
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
(2023)
Article
Chemistry, Multidisciplinary
Fabian Kammerbauer, Won-Young Choi, Frank Freimuth, Kyujoon Lee, Robert Froemter, Dong-Soo Han, Reinoud Lavrijsen, Henk J. M. Swagten, Yuriy Mokrousov, Mathias Klaeui
Summary: The recently discovered interlayer Dzyaloshinskii-Moriya interaction (IL-DMI) in multilayers with perpendicular magnetic anisotropy can stabilize intriguing spin textures such as Hopfions. To control the IL-DMI, the influence of an electric current on a synthetic antiferromagnet with growth-induced IL-DMI was investigated. The study revealed that the azimuthal dependence of IL-DMI shifts with increasing current, suggesting the presence of an additional current-induced term that linearly increases the IL-DMI in the direction of current flow, opening the possibility of easily manipulating 3D spin textures by currents.
Article
Materials Science, Multidisciplinary
Thomas F. Keller, Roman Shayduk, Chan Kim, Nastasia Mukharamova, Arti Dangwal Pandey, Manuel Abuin, Vedran Vonk, Irene Fernandez-Cuesta, Miriam Barthelmess, Robert Froemter, Alexey Zozulya, Artur Erbe, Andreas Stierle
Summary: Structural insight into nano-objects is crucial for understanding the properties of functional materials. X-ray diffraction can be used to extract structural information from nano-arrays. The observed X-ray intensity may originate from potential nanoparticle subsets.
Article
Materials Science, Multidisciplinary
Juriaan Lucassen, Marielle J. Meijer, Mark C. H. de Jong, Rembert A. Duine, Henk J. M. Swagten, Bert Koopmans, Reinoud Lavrijsen
Article
Materials Science, Multidisciplinary
Dion M. F. Hartmann, Rembert A. Duine, Marielle J. Meijer, Henk J. M. Swagten, Reinoud Lavrijsen
Article
Materials Science, Multidisciplinary
Fabian Kloodt-Twesten, Susanne Kuhrau, Hans Peter Oepen, Robert Froemter