We report the formation of colloidal polymers consisting of disk-like silica nanoparticles(NPs)with polystyrene(PS)chains at the bottom of their two cavities assembled through reduction of the solvent quality for the ...We report the formation of colloidal polymers consisting of disk-like silica nanoparticles(NPs)with polystyrene(PS)chains at the bottom of their two cavities assembled through reduction of the solvent quality for the PS chains and linked by hydrophobic associations.We show that this NPs assembly exhibits a two-stage process involving reaction-controlled polymerization and diffusion-controlled polymerization.Colloidal polymer networks are produced by the incorporation of three-patch NPs,which serve as branching points between the colloidal chains.By co-assembling preformed homopolymers composed of patchy NPs of different sizes or surface chemical groups,block copolymers are also achieved.This study provides insight into the process of self-assembly of two-patch NPs by precisely designing the components to generate colloidal analogues of linear macromolecular chains.展开更多
Nanostructured known to exhibit properties metal surfaces have been that deviate from that of the bulk material. By simply modifying the texture of a metal surface, various unique optical properties can be observed. I...Nanostructured known to exhibit properties metal surfaces have been that deviate from that of the bulk material. By simply modifying the texture of a metal surface, various unique optical properties can be observed. In this paper, we present a simple two step electrochemical process combining electrodeposition and anodization to generate black gold surfaces. This process is simple, versatile and up-scalable for the production of large surfaces. The black gold films have remarkable optical behavior as they absorb more than 93% of incident light over the entire visible spectrum and also exhibit no specular reflectance. A careful analysis by scanning electron microscopy reveals that these unique optical properties are due to their randomly rough surface, as they consist in a forest of dendritic microstructures with a nanoscale roughness. This new type of black films can be fabricated to a large variety of substrates, turning them to super absorbers with potential applications in photovoltaic solar cells or highly sensitive detectors and so on.展开更多
基金This work was supported by the Agence Nationale de la Recherche(ENLARgER project,No.ANR-15-CE09-0010)the LabEx AMADEus(No.ANR-10-LABX-42)IdEx Bordeaux(No.ANR-10-IDEX-03-02)。
文摘We report the formation of colloidal polymers consisting of disk-like silica nanoparticles(NPs)with polystyrene(PS)chains at the bottom of their two cavities assembled through reduction of the solvent quality for the PS chains and linked by hydrophobic associations.We show that this NPs assembly exhibits a two-stage process involving reaction-controlled polymerization and diffusion-controlled polymerization.Colloidal polymer networks are produced by the incorporation of three-patch NPs,which serve as branching points between the colloidal chains.By co-assembling preformed homopolymers composed of patchy NPs of different sizes or surface chemical groups,block copolymers are also achieved.This study provides insight into the process of self-assembly of two-patch NPs by precisely designing the components to generate colloidal analogues of linear macromolecular chains.
文摘Nanostructured known to exhibit properties metal surfaces have been that deviate from that of the bulk material. By simply modifying the texture of a metal surface, various unique optical properties can be observed. In this paper, we present a simple two step electrochemical process combining electrodeposition and anodization to generate black gold surfaces. This process is simple, versatile and up-scalable for the production of large surfaces. The black gold films have remarkable optical behavior as they absorb more than 93% of incident light over the entire visible spectrum and also exhibit no specular reflectance. A careful analysis by scanning electron microscopy reveals that these unique optical properties are due to their randomly rough surface, as they consist in a forest of dendritic microstructures with a nanoscale roughness. This new type of black films can be fabricated to a large variety of substrates, turning them to super absorbers with potential applications in photovoltaic solar cells or highly sensitive detectors and so on.
