Cover: Pollen‐filled polystyrene composite films formed by solvent casting demonstrate a 15% improvement in elongation‐at‐break relative to unfilled polystyrene at 2.5 mass% loading. The cover image shows a close‐up scanning electron microscope image of the pollen– polystyrene interface. The inset shows a single ragweed pollen grain embedded in the polystyrene matrix. Further details can be found in the article by J.‐H. Lee, B. M. Suttle, H.‐J. Kim, and J. C. Meredith,* .
A novel type of mm‐sized silica‐based self‐propelling supraparticles displaying buoyancy‐driven homogeneous vertical oscillatory motion using aqueous hydrogen peroxide (H2O2) as chemical fuel is presented. The supraparticles are prepared via a robust droplet templating technique by drying colloidal suspension droplets containing silica microspheres and catalytic Fe3O4@Pt decorated nanoparticles on a superhydrophobic Cu–Ag surface. Oxygen gas originating from Pt catalyzed decomposition of H2O2 is released and gathered onto the hydrophobic supraparticle surface. This causes buoyancy and uplift of the particle to the surface, where the oxygen bubble is released and the particle descents again, leading to an oscillating process in a very regular fashion. The mechanism of this process is characterized and analyzed here quantitatively by a balance of the gravitational and buoyant forces. The theoretical model of particle movement describes how the particle oscillation period depends on the H2O2 concentration. This novel type of self‐propelling particles could find potential applications in mixing and catalysis, especially due to the high regularity of their periodic movement.
Described is the formation of crystallized alkaline earth oxide-containing glass adsorbents for radioactive carbon dioxide (14CO2) sequestering and mineralization under mild operating conditions; thus enabling the long-term geological disposal of...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.