Nanomaterials

This study employed a dry-process method to prepare SBS/recycled LDPE/EVA composite-modified particles (CMP) for asphalt mixture modification. Conventional performance tests, including penetration tests, determined the optimal CMP dosage to be 8% by mass of asphalt. The rheological properties and microstructure of base asphalt, SBS-modified asphalt, and composite-modified asphalt were systematically compared, and the road performance of the corresponding mixtures was evaluated. The results demonstrated that the composite modifier forms a uniform elastic network within the asphalt, significantly enhancing both high- and low-temperature performance and fatigue life while also improving thermal stability and deformation resistance. The modification mechanism is predominantly based on physical blending, and the system exhibits good thermal stability. The outstanding performance of the mixture, including a 284.4% increase in dynamic stability and a 60.1% extension in fatigue life, is attributed to the formation of a “skeleton–asphalt–particle” multiphase structure. Comprehensive performance analysis indicated that optimal performance is achieved with an SBS/LDPE/EVA ratio of 1:1:1, highlighting the considerable practical engineering potential of this dry-process composite modification technology.

Metalenses capable of controlling more than two types of polarized light have drawn broad interest recently, as they can bring great flexibility and possibilities to the design of highly integrated polarization imaging devices that are not limited by theoretical efficiency. However, current metalenses for practical applications can only perform imaging with dual-polarization states simultaneously through a single aperture. Herein, a polarization-multiplexed multifunctional metalens enabled with three kinds of phase manipulation is proposed. Specifically, by encoding three groups of specific meta-atoms within a single aperture through spatial multiplexing, a “three-in-one” meta-device acting as a composite metalens can be constructed. Theoretical analysis and calculation simulations validate the performance of the metalens. Under circularly polarized light, the metalens exhibits three nearly diffraction-limited coplanar focal spots with horizontal, vertical, and circular polarization properties, respectively, and has a total focusing efficiency of 60%. This device can be used for triple-polarization imaging in real time, with promising prospects in highly integrated polarization imaging systems.

In the present work, 1.92 wt% Pd/9.68 wt% CeO₂/spherical mesoporous silica (denoted as 1.92Pd/9.68CeO₂/KCC-1) and 1.96 wt% Pd/KCC-1 (denoted as 1.96Pd/KCC-1) catalysts were prepared. It was found that the 1.92Pd/9.68CeO₂/KCC-1 sample exhibited an excellent catalytic activity for methane combustion, which was much better than that of the 1.96Pd/KCC-1 sample. In addition, the 1.92Pd/9.68CeO₂/KCC-1 sample possessed good high-temperature stability and water resistance. The enhanced methane combustion performance of 1.92Pd/9.68CeO₂/KCC-1 was mainly attributed to the good dispersion of Pd species and the stabilization of the active Pd²⁺ species and generation of more reactive oxygen species by CeO₂ modification. This work offers new insights into developing methane combustion catalysts with low-temperature catalytic performance and high-temperature stability.