Formation of net-like patterns of gold nanoparticles in liquid crystal matrix at the air–water interface

Paczesny, Jan; Sozański, Krzysztof; Dzięcielewski, Igor; Żywociński, Andrzej; Hołyst, Robert

doi:10.1007/s11051-012-0826-4

Cited by 16 publications

(14 citation statements)

References 43 publications

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“…This is also how our template is different from those selected by previous workers where the effective area occupied by the template molecule on water is much larger. [7][8][9][10] The presence of non-fractal pattern in the CMNS network, as opposed to others, 9 suggests that this is not a diffusion limited aggregation system 8 17 and thus the interaction leading to the self-assembly is not strictly short-ranged. The stability and reproducibility of the network suggests that the stability criterion of z ≥ 2d, where z is the number of bonds connecting any node of the network to other nodes and d is the spatial dimension, is met by the network.…”

Section: A Plausible Model For the Cmns Networkmentioning

confidence: 92%

A Two-Dimensional Network of Au Nanoclusters on Water Surface: Example of Facile Control of Nanospace

Choudhuri¹,

Datta²

2014

j nanosci nanotechnol

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We report isotherm and Brewster Angle Microscopy (BAM) studies on mixed monolayers of Stearic Acid (StA) and Dodecanethiol-capped gold nanoparticles (AuNPs) (10% by weight) at the air-water interface. The surface pressure-specific molecular area isotherm for the mixed monolayer shows small hysteresis as well as a lowering of the slope change in going from L2-L2' and L2'-S phases, indicating lesser number of monolayer phases for the mixed film relative to a pristine StA monolayer. The BAM study shows formation of a two-dimensional, stable, reproducible, and extensive network of nanoparticle clusters with near-circular pores, in the 5-20 mN/m surface pressure range. This assembly of nanospaces has a pore area peak at approximately 75 microm2, width approximately 120 microm2 and can be disassembled and reassembled simply by changing the surface pressure.

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Section: A Plausible Model For the Cmns Networkmentioning

confidence: 92%

A Two-Dimensional Network of Au Nanoclusters on Water Surface: Example of Facile Control of Nanospace

Choudhuri¹,

Datta²

2014

j nanosci nanotechnol

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“…Similar morphology was recorded by Paczesny et al for hydrophobic gold nanoparticles distributed in liquid crystal matrix. 35 For POSS 7:1 + SiO 2 1% we observed also dense network-like structure however at p ¼ 17 mN m À1 these domains merge into homogenous layer. For 2% concentration of silica, we observed stepwise formation of the homogenous lm of uniform contrast.…”

Section: Bam Imagesmentioning

confidence: 67%

Interfacial behaviour of cubic silsesquioxane and silica nanoparticles in Langmuir and Langmuir–Blodgett films

et al. 2016

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In recent years fluorinated polyhedral oligomeric silsesquioxanes (POSS) have been established as useful for the fabrication of superhydrophobic surfaces, however little attention has been paid to their use for making ultrathin coatings by the Langmuir-Blodgett method. On the other hand, recently POSS compounds have been recognized as a new group of film-forming materials. In this study the interfacial behavior of fluorinated polyhedral oligomeric silsesquioxanes (POSS) mixed with silica nanoparticles was studied at the air/water interface. Surface pressure-area isotherms and Brewster angle microscopy revealed the formation of a mixed film. Incorporation of nanoparticles in a POSS monolayer caused formation or more condensed and rigid film as shown by analysis of compressibility and dilatational viscoelasticity. On the other hand POSS molecules act as an excellent dispersant which prevents silica nanoparticles from aggregation. Deposition of the Langmuir-Blodgett film composed of POSS and silica nanoparticles allowed a hydrophobic surface showing water contact angles reaching 135 to be obtained, which suggests possible application of our approach in the fabrication of ultrathin, water-repellent coatings.

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“…In most cases patterns are a manifestation of instabilities in a spatially homogeneous state created when the system is driven away from a Surface Physics and Materials Science Division, Saha Institute of Nuclear Physics, pulsion between the acid head groups, when the monolayer is driven away from equilibrium via slow compression [6][7][8][9] . In fact pattern formation in phase separating 2D mixtures has been reported in a number of systems [10][11][12][13][14][15][16] . In fact pattern formation in phase separating 2D mixtures has been reported in a number of systems [10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 86%

Time-structuring in the evolution of 2D nanopatterns through interactions with substrate

Choudhuri

Datta

2016

Soft Matter

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Hydrophobic dodecanethiol capped gold nanoparticles (AuNPs) are found to self-assemble into two-dimensional patterns in monolayers of amphiphiles spread at the air-water interface of a Langmuir trough. In this communication we investigate the role of the nanoparticle-monolayer (FNMA) and monolayer-monolayer (FMMA) lipophilic attraction in influencing morphology and dynamics of AuNP cluster patterns in fatty acid monolayers. FNMA and FMMA are progressively varied by changing n, where n is the number of -CH2 groups in the alkyl tails of the amphiphilic fatty acid (CH3(CH2)nCOOH) molecules forming the monolayer. Compressibility measurements on the pristine and nanoparticle-laden monolayers show that, while the compressibility of the pristine monolayer decreases with increasing n, pointing to a progressive increase in FMMA, the effect of nanoparticles (increase in compressibility or lowering of FMMA) is discernible only for 14 < n < 22. The corresponding pattern morphology, observed with a Brewster Angle Microscope (BAM) at an in-plane resolution of 450 nm for 6 hours, reveals that there are essentially three stages in pattern evolution, lamellae of Au nanoclusters spread over the fatty-acid monolayer background (the λ state) followed by a network of nanoclusters with high node density (the ν state) and finally rings (circular/elongated) of random sizes with very low node density (the ρ state), evolving from an initial unsegregated state, without appreciable change in the average nanoparticle number density over the field of view. Increasing FNMA alongwith FMMA is found to shift a certain state to later times, thus playing the role of a viscous drag and introducing a delay in the timeline. The mean square fluctuation of BAM intensity remains flat and then decays as f(ξ) = ξ(2H) over smaller length scales, where ξ is the spatial separation and H the Hurst exponent. The study of f(ξ) over time reveals the growth of a sub-diffusive regime (H < 0.5) at the intermediate length scale, in almost all the films coinciding with the emergence of the ρ state. The growth of this sub-diffusive regime is slower for stronger FNMA and FMMA, the interactions thus acting as control parameters in dictating the time structure of the spatio-temporal patterns.

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Formation of net-like patterns of gold nanoparticles in liquid crystal matrix at the air–water interface

Cited by 16 publications

References 43 publications

A Two-Dimensional Network of Au Nanoclusters on Water Surface: Example of Facile Control of Nanospace

A Two-Dimensional Network of Au Nanoclusters on Water Surface: Example of Facile Control of Nanospace

Interfacial behaviour of cubic silsesquioxane and silica nanoparticles in Langmuir and Langmuir–Blodgett films

Time-structuring in the evolution of 2D nanopatterns through interactions with substrate

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