Self-Assembly of Nanoparticles at Solid and Liquid Surfaces

Šiffalovič, Peter; Majková, E.; Jergel, M.; Végsö, Karol; Weis, Martin; Luby, Š.

doi:10.5772/35227

Cited by 7 publications

(7 citation statements)

References 43 publications

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Section: Resultssupporting

confidence: 77%

“…Formation of the bilayer was confirmed also by our atomic force microscopy (AFM) studies of the Ag nanoparticle films transferred onto solid substrates in stage IV of the isotherm. 30 We observed a similar compression behavior and bilayer formation for the iron oxide and cobalt−iron oxide nanoparticle Langmuir films with the identical oleic acid and oleylamine surfactant. On the other hand, GISAXS studies of the Au thiolcapped nanoparticle film performed at equilibrium conditions and with a smaller compression speed revealed only a monolayer buckling manifested by bending the Bragg rods.…”

Section: Resultssupporting

confidence: 66%

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Nonequilibrium Phases of Nanoparticle Langmuir Films

et al. 2012

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We report on an in-situ observation of the colloidal silver nanoparticle self-assembly into a close-packed monolayer at the air/water interface followed by a 2D to 3D transition. Using the fast tracking GISAXS technique, we were able to observe the immediate response to the compression of the self-assembled nanoparticle layer at the air/water interface and to identify all relevant intermediate stages including those far from the equilibrium. In particular, a new nonequilibrium phase before the monolayer collapse via the 2D to 3D transition was found that is inaccessible by the competing direct space imaging techniques such as the scanning and transmission electron microscopies due to the high water vapor pressure and surface tension.

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Section: Resultssupporting

confidence: 77%

Section: Resultssupporting

confidence: 66%

Nonequilibrium Phases of Nanoparticle Langmuir Films

et al. 2012

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“…The compressed film was transferred onto the Si/SiO 2 substrate by modified Langmuir–Schaefer deposition. ,− To further confirm the alignment of SWCNTs, we performed polarized Raman microspectroscopy with a constant polarization of the incident light while rotating the sample . The intensity of the Raman G-band increases when the alignment matches the polarization plane and decreases when the alignment direction is perpendicular to the polarization plane (Figure ).…”

Section: Resultsmentioning

confidence: 99%

Langmuir–Scheaffer Technique as a Method for Controlled Alignment of 1D Materials

et al. 2020

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A widely applicable method for aligning 1D materials, and in particular carbon nanotubes (CNTs), independent of their preparation would be very useful as the growth methods for these materials are substance-specific. Langmuir−Schaefer (LS) deposition could be such an approach for alignment, as it aligns a large number of 1D materials independently of the desired substrate. However, the mechanism and required conditions for alignment of 1D nanomaterials in a Langmuir trough are still unclear. Here we show, relying on numerical simulations of the Langmuir film compression, that the LS method is a powerful tool to achieve maximal alignment of 1D material in a controllable manner. In particular, 1D materials terminated with a suitable surfactant can align only if the velocity induced by the attraction between individual 1D entities is low enough relative to the flow speed. To validate this model, we achieved an efficient LS alignment of single-walled carbon nanotubes covered with a suitable surfactant relying on the numerical simulations. In situ polarized Raman microspectroscopy during the compression of Langmuir film revealed good quantitative agreement between the numerical simulations and the experiment. This suggests the applicability of the LS technique as a versatile method for the controlled alignment of 1D materials.

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“…The formation of densely packed arrays of non-porous silica NPs onto a polished silicon substrate was achieved via a modified Langmuir-Schaefer transfer of NPs from the air/water interface onto a submerged substrate (20,21) as depicted in Figure 1A . To maximise the particle density in the monolayer, pressure-area isotherms were recorded to establish the maximum surface pressure applicable to the NP monolayer at the air-water interface before excessive compression resulted in a collapse, indicated by an abrupt change in surface pressure ( Figure 1B ).…”

Section: Main Textmentioning

confidence: 99%

Structural Characterisation of Nanoparticle-Supported Lipid Bilayers by Grazing Incidence X-ray and Neutron Scattering

Paracini

Gutfreund

Welbourn

et al. 2022

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The structure of supported lipid bilayers formed on a monolayer of nanoparticles was determined using a combination of grazing incidence X-ray and neutron scattering techniques. Ordered nanoparticle arrays assembled on a silicon crystal using a Langmuir-Schaefer deposition were shown to be suitable and stable substrates for the formation of curved and fluid lipid bilayers that retained lateral mobility, as shown by fluorescence recovery after photobleaching. A comparison between the structure of the curved bilayer assembled around the nanoparticles with the planar lipid membrane formed on the flat underlying silicon oxide surface revealed a ~5 Angstrom thinner bilayer on the curved interface, resolving the effects of curvature on the lipid packing and overall bilayer structure. The combination of neutron scattering techniques, which grant access to sub-nanometre scale structural information at buried interfaces, and nanoparticle-supported lipid bilayers, offers a novel approach to investigate the effects of membrane curvature on lipid bilayers.

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Self-Assembly of Nanoparticles at Solid and Liquid Surfaces

Cited by 7 publications

References 43 publications

Nonequilibrium Phases of Nanoparticle Langmuir Films

Nonequilibrium Phases of Nanoparticle Langmuir Films

Langmuir–Scheaffer Technique as a Method for Controlled Alignment of 1D Materials

Structural Characterisation of Nanoparticle-Supported Lipid Bilayers by Grazing Incidence X-ray and Neutron Scattering

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