Article
Astronomy & Astrophysics
Marius A. Oancea, Achal Kumar
Summary: We analyze Dirac fields on any spacetime background and in the presence of a fixed electromagnetic field using a semiclassical approach based on the Wentzel-Kramers-Brillouin approximation. By considering spin-orbit coupling between internal and external degrees of freedom, effective ray equations with spin-dependent terms are derived, describing the gravitational spin Hall effect of localized Dirac wave packets. Both massive and massless Dirac fields are considered, and the semiclassical dynamics is governed by a covariantly defined Berry connection and the associated Berry curvature. The gravitational spin Hall equations are shown to be specific cases of the Mathisson-Papapetrou equations for spinning objects.
Article
Physics, Fluids & Plasmas
Aref Hashemi, Mehrdad Tahernia, William D. Ristenpart, Gregory H. Miller
Summary: When applying an oscillatory electric potential to an electrolyte solution, it has been commonly assumed that the choice of which electrode is grounded or powered does not matter. However, recent studies have shown that certain types of nonantiperiodic multimodal oscillatory potentials can induce a net steady field towards either the grounded or powered electrode. These steady fields, known as asymmetric rectified electric fields (AREFs), are spatially dissymmetric between electrodes and can be influenced by the applied potential's odd nonlinear orders. The existence of these steady fields has significant implications for the interpretation, design, and applications of electrochemical and electrokinetic systems.
Article
Energy & Fuels
Youngmin Kim, Jeong-Woong Hong, Min-Gyu Jeon, Dae Geun Park, Sung Hwan Yoon
Summary: The impact of AC electric fields on a nonpremixed coflow-jet flame was investigated. Four distinct flame behaviors were identified: oscillating flame with applied frequency, fluctuating flame, instability-induced extinction, and blowout. The study provides detailed analysis and discussion of each behavior and highlights the importance of the azimuthal component of the ionic wind on flame behavior.
Article
Multidisciplinary Sciences
Peng-Kai Kao, Bryan J. VanSaders, Sharon C. Glotzer, Michael J. Solomon
Summary: This research demonstrates that cyclically applied electric fields can improve the quality of colloidal crystals by annealing local disorder. The optimal off-duration for maximum annealing is found to be approximately half of the characteristic melting half lifetime of the crystalline phase. Local six-fold bond orientational order grows more rapidly than global scattering peaks, indicating that local restructuring leads to global annealing.
SCIENTIFIC REPORTS
(2021)
Article
Thermodynamics
Min Sung Kang, Sun Ho Park, Chun Sang Yoo, Jeong Park, Suk Ho Chung
Summary: The experimental investigation showed that the metal core has a significant impact on the flame spread behavior over polyethylene-insulated electrical wire. The behavior of Cu-core and NiCr-core varied in terms of flame spread rate and flame size, with different responses to applied AC electric fields.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Physics, Fluids & Plasmas
K. R. Gage, X. Chen, M. Van Zeeland, W. W. Heidbrink, J. Hanson, B. Lyons, D. C. Pace, J. Galdon-Quiroga, M. Garcia-Munoz
Summary: The impact of n = 1 magnetic perturbations (MPs) on fast ion losses in DIII-D has been explored through the use of light ion beam probe technique. Various MP spectra have been studied to examine the effect of normalized beta, fin, and plasma response on the MPs. The magnetic data demonstrates that the plasma response to fin strongly relies on the phase difference in perturbation coils, ??UL.
Article
Chemistry, Multidisciplinary
Xingrui Zhu, Yan Gao, Ramona Mhana, Tao Yang, Benjamin L. Hanson, Xingfu Yang, Jingjing Gong, Ning Wu
Summary: Anisotropic particles are used to make micro/nanomotors converting energy into mechanical energy. Most colloidal motors are hard to control but asymmetric dimers under AC electric fields show rich propulsion behaviors. By using orthogonal AC electric field and DC magnetic field, the speed and direction of dimers can be controlled independently, allowing for precise particle motion with complex trajectories. This approach has the potential to create other types of magnetically anisotropic particles and pave the way for assembling them into complex structures.
Article
Chemistry, Physical
Shuaifang Zhang, Rajeev Kumar
Summary: We present an approach for constructing thermodynamically consistent time-dependent models for thin films of diblock copolymers in applied electric fields. The model is sensitive to initial conditions and shows transient behavior different from a model assuming a constant transport coefficient. Numerical results are qualitatively agreement with experiments, providing a systematic method for simulating the effects of electrolytes added to thin films containing diblock copolymers in the presence of applied electric fields.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Engineering, Environmental
Pawel Niegodajew, Artur P. Durajski, Przemyslaw Rajca, Konrad M. Gruszka, Maciej Marek
Summary: Cylindrical particles are widely used in chemical engineering for their high surface area, but little is known about their orientation in random packed beds. This study introduces a new experimental approach to systematically investigate the global and local orientation of cylindrical particles. The results show that the orientation distribution of particles is affected by the number of particles per layer and the presence of the column wall and its bottom. Numerical simulations further reveal that the orientation of different particle shapes has a significant impact on pressure drop in packed beds.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Energy & Fuels
Stephanie Azlyn Anak Felix, Muhamad Faiz Md Din, Asnor Mazuan Ishak, Jianli Wang, Nurul Hayati Idris, Wan Fathul Hakim Wan Zamri
Summary: This paper discusses an experimental study on the effects of doping carbon nanotube particles and magnetic fields on the electrical properties of mineral oil. The results show that adding a proper amount of carbon nanotubes and a suitable magnetic field can improve the performance of transformers.
Article
Physics, Multidisciplinary
Jinsheng Lu, Vincent Ginis, Soon Wei Daniel Lim, Federico Capasso
Summary: This study proposes optical traps using nonconservative forces instead of conservative intensity-gradient forces, expanding the trap parameter space. By incorporating helicity and polarization gradient optical trapping, achiral particles can be trapped in evanescent fields, as well as proposing an optical switching system to manipulate trapped microspheres around microfibers. This study deepens the understanding of light-matter interactions in polarization gradient fields and broadens the range of compatible particles and stable trapping fields.
PHYSICAL REVIEW LETTERS
(2023)
Article
Chemistry, Physical
Satoshi Aya, Junichi Kougo, Fumito Araoka, Osamu Haba, Koichiro Yonetake
Summary: This article investigates the nontrivial topological properties of micro-rods dispersed in nematic liquid crystals through experimental observation and computer simulation. The topological variation is driven by photodynamically changing the surface anchoring using azobenzene-based surface-commander molecules. The results assist in the development of photo-driven micro-robotics in fluids.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Lei Wei, Francisco J. Rodriguez-Fortuno
Summary: This study clarifies the discrepancy in torque calculation in prior literature and provides accurate expressions for the dipolar and quadrupolar torques based on first principles. The results are validated through numerical integration. The study also highlights the importance of distinguishing between the spin of the electromagnetic field gradient and the local electromagnetic field spin when calculating torque.
Article
Chemistry, Physical
Fangyuan Dong, Samira Munkaila, Veronica Grebe, Marcus Weck, Michael D. Ward
Summary: This study presents a synthetic strategy for creating metallodielectric particles with spatially segregated amine-functionalized lobes, which can be selectively coated with gold. The researchers also found that dielectrophoretic forces exerted by an AC field can generate aggregate structures of different shapes and lobe arrangements.
Article
Materials Science, Multidisciplinary
M. Belovs, A. Cebers
Summary: In this paper, an efficient numerical algorithm is proposed for simulating the motion of flexible filaments in two dimensions. The algorithm is applied to study the buckling instability and eigenfrequencies of deformations in a ferromagnetic filament during magnetic field inversion, as well as the dynamics of a flexible filament with an attached Quincke particle. The bifurcations between oscillating and rotating states are illustrated.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Optics
Ivo M. Pinatti, George R. Fern, Elson Longo, Terry G. Ireland, Paula F. S. Pereira, Ieda L. Rosa, Jack Silver
JOURNAL OF LUMINESCENCE
(2019)
Article
Materials Science, Multidisciplinary
Liping Yu, Daniel Den Engelsen, Jurgen Gorobez, George R. Fern, Terry G. Ireland, Chris Frampton, Jack Silver
OPTICAL MATERIALS EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Max Volhard, Daniel den Engelsen, George R. Fern, Terry G. Ireland, Jack Silver
OPTICAL MATERIALS EXPRESS
(2019)
Article
Materials Science, Multidisciplinary
Max Volhard, Liping Yu, Daniel den Engelsen, George R. Fern, Terry G. Ireland, Jack Silver
OPTICAL MATERIALS EXPRESS
(2020)
Article
Materials Science, Multidisciplinary
Daniel den Engelsen, George R. Fern, Terry G. Ireland, Fengli Yang, Jack Silver
OPTICAL MATERIALS EXPRESS
(2020)
Article
Engineering, Electrical & Electronic
Keith Behrman, Julie Fouilloux, Terry Ireland, George R. Fern, Jack Silver, Ioannis Kymissis
Summary: This study investigates two non-destructive test methods, finding that cathodoluminescent imaging provides a rich dataset for identifying and categorizing common defects during micro LED display fabrication, while photoluminescent imaging is not an effective method for fidelity analysis but does offer information on dry-etching uniformity.
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
(2021)
Article
Biochemistry & Molecular Biology
Jack Silver, Golzar Al-Jaff, Michael T. WilsonnAff, Daniel den Engelsen, George R. Fern, Terry G. Ireland
Summary: This study reports on the formation of low-spin six-coordinate [Fe(PPIX)L-2] complexes from iron(II) protoporphyrin with various nitrogenous ligands. Optical and Mossbauer spectroscopy were used to monitor the adduct formation and electronic environment of the central iron atom. The study discusses the bonding constants in relation to ligand structure and also highlights the implications for understanding haem proteins and the binding of inhibitor molecules.
JOURNAL OF BIOLOGICAL INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jasim H. Hassen, Jack Silver
Summary: The adsorption process of phthalocyanines complexes onto montmorillonite clay MMT is only completed after firing treatment, which results in different colors. The complex-hosting matrix of MMT particles allows for actual adsorption of the complexes to occur after firing.
UNIVERSITY POLITEHNICA OF BUCHAREST SCIENTIFIC BULLETIN SERIES B-CHEMISTRY AND MATERIALS SCIENCE
(2021)
Article
Engineering, Multidisciplinary
Jasim Hamadi Hassen, Jack Silver
JURNAL TEKNOLOGI-SCIENCES & ENGINEERING
(2020)
Article
Materials Science, Multidisciplinary
Daniel den Engelsen, George R. Fern, Terry G. Ireland, Jack Silver
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2020)