Junyang Chen,Zhendong Xie,Riccardo Sapienza,Zhijia Hu,Lorena Ruiz-Pérez,Xiaohe Tian,Giuseppe Battaglia
Random lasers (RLs) represent a distinctive class of laser systems wherein emission arises from multiple scattering events occurring with random orientations within a disorder media. Departing from conventional laser architectures, RL emission is primarily governed by random scattering phenomena, inherently limiting precise control over emission directionality and threshold intensity. Achieving a laser system with finely controllable RL characteristics poses a significant challenge. In this investigation, using polymeric high internal phase emulsion (PolyHIPE) scaffolds, known for their highly customizable surface topographies, is exploredas scattering media platforms for RLs. Dye on the PolyHIPE surface enables interaction with external stimuli, showing sensing potential. Using surface chemical modification techniques, the amphiphilic molecular is grafted onto the HIPE surface and RL behavior is investigated across HIPEs with controllable pore sizes. Notably, a discernible correlation emerges between the RL threshold and the collective influence of polyHIPE platform morphology and gain particle configuration. This heightened adaptability and finely tunable precision in the RL system offer increased versatility, enabling the tailored design of optimal lasers suited for diverse application scenarios. Consequently, these advancements substantially enhance the utility and versatility of RLs in various fields.
Junzhi Lin,Xianger Xia,Yifei Liu,Zhenchao Luan,Yezhen Chen,Kunkai Ma,Bing Geng,Hui Li
Fluoro-PolyHIPEs with porous structure exhibit an excellent weather resistance for adsorption, separation or catalyst support applications in extreme environments, however, the specific surface area still needs to be improved. In this study, a porous fluorinated material is prepared by using high internal phase emulsion template method, and the porous structure of fluoro-PolyHIPE (F-PolyHIPE) is subsequently excavated and modified by the hypercrosslinking “knitting” method. The “knitting” of micropores in the pore walls of the fluoropolymer is achieved through the Friedel-Crafts alkylation reaction by using dimethoxymethane (FDA) as the external crosslinker. It transforms the macroporous fluoropolymer prepared based on HIPE emulsion template method into hierarchical porous fluoro-PolyHIPE (HCPF-PolyHIPE) with a high specific surface area. The specific surface area of the porous fluorinated material demonstrates an increment from 15.6 m 2 g −1 to 353.2 m 2 g −1 after hypercrosslinking. Owing to the introduction of the micropores and mesopores as well as the enrichment of the fluorine atoms in the polymer network, HCPF-PolyHIPE can be successfully applied for CO 2 adsorption, thus, representing a major achievement of the study. Moreover, HCPF-PolyHIPE exhibits excellent thermal stability as well as acid and alkali resistance, thus, confirming potential application prospects in the fields of oil-water separation and gas adsorption.
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