Orientation of a dielectric rod near a planar electrode
Literature Information
Bas W. Kwaadgras, Thijs H. Besseling, Tim J. Coopmans, Anke Kuijk, Arnout Imhof, Alfons van Blaaderen, Marjolein Dijkstra, René van Roij
We present experimental and theoretical results on suspensions of silica rods in DMSO–water, subjected to an applied electric field. The experimental results indicate that, if the electrode used for generating the electric field is in direct contact with the suspension, a fraction of the rods close to the electrode surface does not stand parallel to the field but instead lies flat on the electrode when the field is switched on. To explain these results theoretically, we modify the coupled dipole method to include “image dipoles”, and find that a rod close to the electrode experiences not only the expected global potential energy minimum at an orientation parallel to the electric field, but also a local minimum several times the thermal energy in depth for orientations parallel to the electrode surface. Additionally, we indicate how the magnitude of the potential energy depends on the electric field strength and include results not only for negatively polarizable (which correspond to the aforementioned experimental system), but also for positively polarizable rods.
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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.










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