Using Langmuir-Blodgett (LB) assembly, it is possible to control the packing density and orientation of nanoparticles in a monolayer level at the air/water interface, and then transfer to a solid substrate. In the presence of nanoparticles, the compression-isotherm profile is significantly modified, implying structural changes of LB films. In this study, we identified topographic effects of rod-shaped nanoparticles on the modification of compression-isotherm, specifically when nanoparticles are electrostatically adsorbed beneath the air/ionic surfactant/water interface. The arrangements of nanoparticles and ionic surfactants as well as topographical corrugation of the air/liquid interface during the LB compression were analyzed using in situ sum frequency generation spectroscopy. In addition, we elucidated the interplay between compression- and flow-induced alignment of rod-shaped nanoparticles during the LB deposition. In the case of uniaxially aligned cellulose nanocrystals in the LB film, their optical and frictional anisotropic properties were characterized using spectroscopic ellipsometer and atomic force microscopy, respectively. We expect that findings of this study will inform the preparation of uniform arrangements of LB films made of nanoparticles, with related impact on their material properties.

Structuring of rod-shaped nanoparticles using Langmuir-Blodgett assembly and investigation of their anisotropic properties

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.