Nanoscale 2D Structure and Self-Assembled Properties

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "2D and Carbon Nanomaterials".

Deadline for manuscript submissions: closed (31 March 2021) | Viewed by 3268

Special Issue Editor


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Guest Editor
Institut des NanoSciences de Paris (INSP) Sorbonne Université BP 840 - 4 place Jussieu 75252 Paris, France
Interests: physics and surface of soft matter; langmuir and langmuir blodgett monolayer and organic thin films; self-assembly phenomena, structure and phases transitions; hybrid systems metal-organic layers and nano-objects; graphen oxyde and ionic liquid monolayer

Special Issue Information

Dear Colleagues,

Due to their fundamental and important influence on the physical and chemical properties of nanosystems, nanoscale 2D structures and self-assembly at surfaces and interfaces have attracted strong interest in recent years. Practically, they have affected various fields such as, for example, 2D physics, surface reactions in chemistry, or the role of organic film in biology. Although a general description resulting from the various interactions involved can be developed using simple models, many stable, unexpected situations have occurred in recent years, resulting apparently from specific driving forces or the need to consider the limited vertical perpendicular dimension (2D+ε). Accordingly, improving the generalisation and exploring our understanding of these situations is a real challenge for the next future. Experimentally, these systems are usually represented by mono or few layers composed of organic molecules, polymers, or nanoparticles deposited on various substrates. They generally present the strong advantage that they can be probed at almost all scales (macroscopic, mesoscopic, and microscopic) by thermodynamic, optic, and AFM microscopies; x-rays; and neutron scattering measurements, which should allow for a coherent and global description of the self-assembling processes observed.

This Special Issue of Nanomaterials aims to present a broad range of examples or models in this subject from 2D transitions observed with simple (amphiphilic) and more complex (proteins) molecules or polymers, up to the surface behaviour of the pure nanoparticle layer or mixed with organic species.

The format of expected articles includes full papers, communications, and reviews.

Prof. Dr. Michel Goldmann
Guest Editor

Manuscript Submission Information

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Keywords

  • Organic monolayer
  • Self assembled monolayer
  • Nanoparticles selfassembly
  • Membranes
  • Polymer film
  • Fluid interfaces
  • Surfactants
  • Adsorbed layers

Published Papers (1 paper)

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Research

16 pages, 4741 KiB  
Article
Langmuir Films of Perfluorinated Fatty Alcohols: Evidence of Spontaneous Formation of Solid Aggregates at Zero Surface Pressure and Very Low Surface Density
by Pedro Silva, Duarte Nova, Miguel Teixeira, Vitória Cardoso, Pedro Morgado, Bruno Nunes, Rogério Colaço, Marie-Claude Fauré, Philippe Fontaine, Michel Goldmann and Eduardo J. M. Filipe
Nanomaterials 2020, 10(11), 2257; https://doi.org/10.3390/nano10112257 - 14 Nov 2020
Cited by 6 | Viewed by 2912
Abstract
In this work, Langmuir films of two highly fluorinated fatty alcohols, CF3(CF2)12CH2OH (F14OH) and CF3(CF2)16CH2OH (F18OH), were studied. Atomic Force Microscopy (AFM) images of the films transferred [...] Read more.
In this work, Langmuir films of two highly fluorinated fatty alcohols, CF3(CF2)12CH2OH (F14OH) and CF3(CF2)16CH2OH (F18OH), were studied. Atomic Force Microscopy (AFM) images of the films transferred at zero surface pressure and low surface density onto the surface of silicon wafers by the Langmuir-Blodgett technique revealed, for the first time, the existence of solid-like domains with well-defined mostly hexagonal (starry) shapes in the case of F18OH, and with an entangled structure of threads in the case of F14OH. A (20:80) molar mixture of the two alcohols displayed a surprising combination of the two patterns: hexagonal domains surrounded by zigzagging threads, clearly demonstrating that the two alcohols segregate during the 2D crystallization process. Grazing Incidence X-ray Diffraction (GIXD) measurements confirmed that the molecules of both alcohols organize in 2D hexagonal lattices. Atomistic Molecular Dynamics (MD) simulations provide a visualization of the structure of the domains and allow a molecular-level interpretation of the experimental observations. The simulation results clearly showed that perfluorinated alcohols have an intrinsic tendency to aggregate, even at very low surface density. The formed domains are highly organized compared to those of hydrogenated alcohols with similar chain length. Very probably, this tendency is a consequence of the characteristic stiffness of the perfluorinated chains. The diffraction spectrum calculated from the simulation trajectories compares favorably with the experimental spectra, fully validating the simulations and the proposed interpretation. The present results highlight for the first time an inherent tendency of perfluorinated chains to aggregate, even at very low surface density, forming highly organized 2D structures. We believe these findings are important to fully understand related phenomena, such as the formation of hemi-micelles of semifluorinated alkanes at the surface of water and the 2D segregation in mixed Langmuir films of hydrogenated and fluorinated fatty acids. Full article
(This article belongs to the Special Issue Nanoscale 2D Structure and Self-Assembled Properties)
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