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Quasi‐Particles
Hydrodynamic fluids, such as water, can have a whirlpool structure because of backflows near the injection or sinking point. However, electrons in conventional solids have an Ohmic flow, making whirlpool formation impossible. In article number 2206604, Gyung‐Min Choi, Maxim Nikolaevich Chernodub, and co‐workers find that electron‐hole quasiparticles in WTe2 semimetal have the pseudo‐hydrodynamic...
Recently, much interest has emerged in fluid‐like electric charge transport in various solid‐state systems. The hydrodynamic behavior of the electronic fluid reveals itself as a decrease of the electrical resistance with increasing temperature (the Gurzhi effect) in narrow channels, polynomial scaling of the resistance as a function of the channel width, violation of the Wiedemann–Franz law supported...
Metal–Organic Polyhedra
Surface modification of Ni‐rich cathode is essential for advancing high energy density and long‐term stability for Li‐ion batteries. Metal‐organic polyhedra decorated with acyl groups (MOPAC) is coated on the cathode by spray method. The Ni‐rich cathodes coated with MOPAC offering Li‐ion selectivity and facile electron transport exhibit enhanced structural stability and gas...
Surface modification of cathodes using Ni‐rich coating layers prevents bulk and surface degradation for the stable operation of Li–ion batteries at high voltages. However, insulating and dense inorganic coating layers often impede charge transfer and ion diffusion kinetics. In this study, the fabrication of dual functional coating materials using metal–organic polyhedra (MOP) with 3D networks within...
In article number 1907478, Shin‐Hyun Kim, Geun Woo Lee, and co‐workers present a unique platform of an electrostatically‐levitated spherical droplet for a real‐time in‐situ probing of colloidal crystallization. The gradual evaporation of the levitated droplet initiates the crystallization, of which detailed progression is monitored by simultaneous measurements of volume change and reflectance spectra...
Colloidal crystallization is analogous to the crystallization in bulk atomic systems in various aspects, which has been explored as a model system. However, a real‐time probing of the phenomenon still remains challenging. Here, a levitation system for a study of colloidal crystallization is demonstrated. Colloidal particles in a levitated droplet are gradually concentrated by isotropic evaporation...
The anionic redox chemistries of layered cathode materials have been in focus recently due to an intriguing phenomenon that cannot be described by the number of electrons of transition metal ions. However, even though several studies have investigated the anionic redox chemistry of layered materials in terms of the charge compensation, the relationship between the origin of the structural behavior...
Colloidal crystals and glasses have their own photonic effects. Colloidal crystals show high reflectivity at narrowband, whereas colloidal glasses show low reflectivity at broadband. To compromise the opposite optical properties, a simple means is suggested to control the colloidal arrangement between crystal and glass by employing two different sizes of silica particles with repulsive interparticle...
CH3NH3PbI3 is one of the promising light sensitizers for perovskite photovoltaic cells, but a thick layer is required to enhance light absorption in the long‐wavelength regime ranging from PbI2 absorption edge (500 nm) to its optical band‐gap edge (780 nm) in visible light. Meanwhile, the thick perovskite layer suppresses visible‐light absorption in the short wavelengths below 500 nm and charge extraction...
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