Review
Chemistry, Multidisciplinary
Jeotikanta Mohapatra, Meiying Xing, Jacob Elkins, Julian Beatty, J. Ping Liu
Summary: The study found that the design of high coercivity ferromagnetic materials can be achieved by considering factors such as nanowire diameter, alignment, and packing density. Analysis based on experimental results and literature reveals a coercivity ceiling in consideration of geometrical dimensions and effective magnetic anisotropy.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
D. Laura-Ccahuana, E. De Biasi
Summary: In this work, we investigated the surface effects on small antiferromagnetic nanoparticles with diameters less than or equal to 11 nm and Ne'el temperature around 12 K under spin-flop conditions using Montecarlo simulations. Our results showed that decreasing the particle size led to an increase in the effective anisotropy and spin-flop field of the system. The influence of surface anisotropy induced magnetic disorder, which was manifested in the magnetization curves as a function of applied field and temperature. We developed a simple model that reproduced the observed behaviors for low temperatures.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
R. Lakshmi, Parthasarathi Bera, Maheshwarayya Hiremath, Varun Dubey, Asish K. Kundu, Harish C. Barshilia
Summary: Nanocrystalline perovskite materials LaFeO3, LaFe0.9Mn0.1O3, and LaMnO3 have been synthesized using a novel solution combustion route. Characterization using physicochemical techniques revealed different structures and properties of these materials, with LaFeO3 and LaFe0.9Mn0.1O3 exhibiting weak ferromagnetism and LaMnO3 showing paramagnetic behavior.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Engineering, Chemical
Gloria L. Jimenez, Rohini Thevi Guntnur, Jason Guiliani, Gabriela Romero
Summary: Magnetic hyperthermia, utilizing magnetic nanoparticles to generate local heat under applied alternating magnetic fields, has been studied for cancer treatments. Shape anisotropy and particle hybridization have been explored as possible routes to enhance magnetic hyperthermia efficacy.
Article
Chemistry, Physical
Wen Jiang, Liwei Cheng, Jianghui Gao, Shiyu Zhang, Hao Wang, Zhihao Jin, Zhongfeng Tang, Cheng Peng
Summary: This study successfully prepared crystalline LaFeO3 nanoparticles with a lower calcination temperature and investigated various experimental conditions affecting crystallization. Under 500°C calcination, crystalline LaFeO3 was formed with crystalline NaFeO2, while the FeO6 octahedral structure was found to be closely associated with the process of crystallization.
Article
Physics, Applied
J. M. Orozco-Henao, D. Muraca, F. H. Sanchez, P. Mendoza Zelis
Summary: The stoichiometry and effective anisotropy constant (K-eff) of iron-oxide nanoparticles with different sizes were studied using Mossbauer spectroscopy. The K-eff value was determined by comparing the size distribution and KeffV product obtained from Mossbauer spectra fitting. An overall surface anisotropy constant Ks was obtained by analyzing the relationship between the mean NP size, experimentally determined K-eff and mean magnetic anisotropy. The study also observed a relation between KeffV values and the magnetite/maghemite fraction in each sample.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Lucila Navarro, Andreas F. Thunemann, Tadahiro Yokosawa, Erdmann Spiecker, Daniel Klinger
Summary: Existing methods often address particle features individually, while our approach transfers the concept of seeded polymerization to phase separated BCP particles, allowing simultaneous control of particle shape and chemical functionality, leading to the preparation of multifunctional BCP colloids.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Materials Science, Multidisciplinary
M. M. Arman, M. A. Ahmed
Summary: La1-xxFe1-yyO3 perovskite nanoparticles were successfully prepared using the citrate combustion method. The samples exhibited good crystallinity, antiferromagnetic properties, and enhanced molar magnetic susceptibility due to vacancy doping. They showed semiconductor-like behavior with conduction mechanisms of small polaron tunneling and correlated barrier hopping.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
D. A. Balaev, A. A. Krasikov, S. Popkov, S. Semenov, M. N. Volochaev, D. A. Velikanov, V. L. Kirillov, O. N. Martyanov
Summary: The analysis of antiferromagnetic nanoparticles using a pulsed technique has broadened the range of external fields for studying magnetic subsystems and solved the issue of ambiguity in distinguishing different contributions in magnetization curves.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)
Article
Astronomy & Astrophysics
S. Q. Zhao, Huirong Yan, Terry Z. Liu, Mingzhe Liu, Huizi Wang
Summary: In this study, we investigate the anisotropy and scaling of sub-Alfvenic solar wind turbulence at magnetohydrodynamic (MHD) scale using observations from the Magnetospheric Multiscale spacecraft. The observations reveal prominent cascade of fluctuations in the direction perpendicular to the background magnetic field, with an increasing anisotropy at higher wavenumbers. The power spectra of different magnetic field components follow different scaling laws, consistent with current compressible MHD theory.
ASTROPHYSICAL JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Min-Soo Kim, Min-Ji Shin, Akshay Kumar, Kavita Kumari, Seok-Hwan Huh, Bon-Heun Koo
Summary: In this study, Ni wires were exposed to external magnetic fields of different geometrical shapes during synthesis, leading to changes in wire morphology and magnetic properties. The external magnetic field was found to have a significant impact on the morphology and magnetic anisotropy of the Ni wires.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Yu Knyazev, D. A. Balaev, S. Stolyar, O. A. Bayukov, R. N. Yaroslavtsev, V. P. Ladygina, D. A. Velikanov, R. S. Iskhakov
Summary: This study investigates the biogenic ferrihydrite nanoparticles and reveals the exceptional magnetic anisotropy formed by the highly developed surface of ferrihydrite nanoparticles. A core-shell structural model of the biogenic ferrihydrite particles is proposed based on Mossbauer data analysis.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Bingyan Liu, Shirong Liu, Vasanthan Devaraj, Yuxiang Yin, Yueqi Zhang, Jingui Ai, Yaochen Han, Jicheng Feng
Summary: The researchers demonstrate a fast 3D nanoprinting technique for manufacturing nanostructured arrays of multiple materials and geometries over millimeter-scale areas by manipulating electric and flow fields. This technique has exciting prospects in the fields of nanophotonics and nanoelectronics.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Li Xu, Zihan Chu, Jianhua Zhang, Tingwei Cai, Xingxing Zhang, Yinzhao Li, Hailong Wang, Xiaochen Shen, Raymond Cai, Haifeng Shi, Chunyin Zhu, Jia Pan, Donghui Pan
Summary: In this study, block polymers with different quaternization degrees were successfully coated on the surface of silica nanocapsules using surface-initiated atom transfer radical polymerization (ATRP), and the antiviral drug Molnupiravir was encapsulated in the polymer-coated nanocapsules. The encapsulated drugs were further incorporated into well-defined films by layer-by-layer (LBL) self-assembly. The researchers investigated the effect of polymer quaternization degree and steric hindrance of functional groups on the growth mode, swelling/deswelling transition, and drug-delivering efficiency of the films.
Article
Engineering, Geological
Xiongying Ma, Hang Lei, Xin Kang
Summary: In this study, the effects of particle shape on the shear behavior of granular soils were investigated through experiments and simulations. It was found that increasing the shape parameter S-h can enhance the interlock between particles and limit the deformation in the direction of shearing. Additionally, changes in particle shape can significantly affect the fabric anisotropy of the soil.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2022)
