研究目的
Investigating the programming of optical properties on mesoscopic scales by patterning host materials and ordering their nanoparticle inclusions, specifically focusing on the combination of liquid crystalline colloidal hosts' orientational order with additive manufacturing for creating 3D patterns of co-aligned gold nanorods and cellulose nanocrystals.
研究成果
The study successfully developed plasmonic metamaterial gels with programmable optical properties through the combination of liquid crystalline colloidal hosts' orientational order and additive manufacturing. These gels exhibit polarization-dependent plasmonic properties, offering potential applications in polarization-sensitive optical elements. The conversion of hydrogels to aerogels further shifts plasmonic resonances, suggesting additional applications in ultralight materials.
研究不足
The approach is limited by the need for precise control over the gels’ order and the CNC concentrations to achieve desired optical properties. The manufacturing procedures may also require optimization for different applications.
1:Experimental Design and Method Selection:
The study combines the orientational order imposed by liquid crystalline colloidal hosts on anisotropic nanoparticle inclusions with an additive manufacturing method to create 3D patterns of co-aligned gold nanorods and cellulose nanocrystals.
2:Sample Selection and Data Sources:
Uses lyotropic cellulose nanocrystals (CNCs) synthesized via a sulfuric acid-hydrolysis method and gold nanorods (GNRs) characterized by their surface plasmon resonance extinction peaks.
3:List of Experimental Equipment and Materials:
Includes a commercially available fused-filament-fabrication 3D printer retrofitted into a direct-ink-writing (DIW) printer, UV light for gelation, and materials like acrylamide monomers, photoinitiator, base catalyst, and cross-linker.
4:Experimental Procedures and Operational Workflow:
Describes two manufacturing procedures for creating hydrogels with controlled CNC and GNR alignment, including printing, UV exposure for gelation, and conversion to aerogels.
5:Data Analysis Methods:
Analyzes the gels' optical properties through spectral characterization and polarizing optical microscopy.
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