Search

Based on the first-principles of density-functional theory (DFT), the effects of NO2, NO, and NH3 adsorption on the change in geometric stability, adsorption properties, and electronic structures of B- or N-doped graphene are investigated. For NO/NO2-B/N-doped graphene systems, NO/NO2 have more stability on B-doped graphenes than them on N-doped graphenes. The introduction of B atom can make the adsorption of NO/NO2 on graphene much easier. The stable configuration of B-doped graphene is more likely to be gas sensor for detecting toxic gases such as NO2 and NO. This makes it possible to use B-doped graphene as sensing materials for designing novel gas sensors. The interaction between NH3 and B/N-doped graphene is rather weak. The results will provide a new direction for the adsorbed NO2, NO, and NH3 on graphene by introducing B/N doping atoms into graphene. [ABSTRACT FROM AUTHOR]

We prepared core-shell polymer-silsesquioxane hybrid microcapsules from cage-like methacryloxypropyl silsesquioxanes (CMSQs) and styrene (St). The presence of CMSQ can moderately reduce the interfacial tension between St and water and help to emulsify the monomer prior to polymerization. Dynamic light scattering (DLS) and TEM analysis demonstrated that uniform core-shell latex particles were achieved. The polymer latex particles were subsequently transformed into well-defined hollow nanospheres by removing the polystyrene (PS) core with 1:1 ethanol/cyclohexane. High-resolution TEM and nitrogen adsorption-desorption analysis showed that the final nanospheres possessed hollow cavities and had porous shells; the pore size was approximately 2-3 nm. The nanospheres exhibited large surface areas (up to 486 m2 g−1) and preferential adsorption, and they demonstrated the highest reported methylene blue adsorption capacity (95.1 mg g−1). Moreover, the uniform distribution of the methacryloyl moiety on the hollow nanospheres endowed them with more potential properties. These results could provide a new benchmark for preparing hollow microspheres by a facile one-step template-free method for various applications. [ABSTRACT FROM AUTHOR]