Dewetting of Au nanoparticle assemblies

Alhummiany, Haya; Jarvis, Samuel; Woolley, Richard A. J.; Stannard, Andrew; Blunt, Matthew O.; Moriarty, Philip

doi:10.1039/c1jm12182k

Cited by 13 publications

(12 citation statements)

References 37 publications

(40 reference statements)

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“…Similar dewetting-driven adsorbate patterns were reported to result from the rupture of films on smooth substrates, e.g. for polystyrene films on the silicon wafers Sharma [52,53], or for thiol-passivated Au nanoparticles dissolved in organic solvents and deposited on silicon substrates [54]. In general, the dewetting of a liquid organic film is a selforganized process that forms microscale and nanoscale features [55,56], induced by dispersion forces, leading to the rupture of the initially homogeneous film, typically by nucleation of holes on the film defects or in spots with high residual stress.…”

Section: After 20 S Of Immersion Time There Was a Higher Ratio Of [N]supporting

confidence: 70%

Formation and composition of adsorbates on hydrophobic carbon surfaces from aqueous laccase-maltodextrin mixture suspension

Ureña

Lisboa‐Filho

Szardenings

et al. 2016

Applied Surface Science

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A robust procedure for the surface bio-functionalization of carbon surfaces was developed. It consists on the modification of carbon materials in contact with an aqueous suspension of the enzyme laccase from Trametes versicolor and the lyophilization agent maltodextrin, with the pH value adjusted close to the isoelectric point of the enzyme. We report in-situ investigations applying Quartz Crystal Microbalance with Dissipation (QCM-D) for carbon-coated sensor surfaces and, moreover, ex-situ measurements with static contact angle measurements, X-ray Photoelectron Spectroscopy (XPS) and Scanning Force Microscopy (SFM) for smooth Highly Oriented Pyrolytic Graphite (HOPG) substrates, for contact times between the enzyme formulation and the carbon material surface ranging from 20 s to 24 h. QCM-D studies reveals the formation of rigid layer of biomaterial, a few nanometers thin, which shows a strongly improved wettability of the substrate surface upon contact angle measurements. Following spectroscopic characterization, these layers are composed of mixtures of laccase and maltodextrin. The formation of these adsorbates is attributed to attractive interactions between laccase, the maltodextrin-based lyophilization agent and the hydrophobic carbon surfaces; a short-term contact between the aqueous laccase mixture suspension and HOPG surfaces is shown to merely result in de-wetting patterns influencing the results of contact angle measurements. The new enzyme-based surface modification of carbon-based materials is suggested to be applicable for the improvement of not only the wettability of low energy substrate surfaces with fluid formulations like coatings or adhesives, but also their adhesion in contact with hardened polymers

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Section: After 20 S Of Immersion Time There Was a Higher Ratio Of [N]supporting

confidence: 70%

Formation and composition of adsorbates on hydrophobic carbon surfaces from aqueous laccase-maltodextrin mixture suspension

Ureña

Lisboa‐Filho

Szardenings

et al. 2016

Applied Surface Science

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“…Cellular networks are commonly observed for the deposition of material from solution following evaporation of a volatile solvent. 9 After annealing the morphology of the surface changes to that observed in Fig. 2b.…”

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confidence: 81%

Probing the chemical structure of monolayer covalent-organic frameworks grown via Schiff-base condensation reactions

Goodeal

Chen

et al. 2016

Chem. Commun.

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Two-dimensional covalent-organic frameworks (2D-COFs) on surfaces offer a facile route to new 2D materials. Schiff-base condensation reactions have proven to be an effective fabrication route for such materials. We present scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) studies of porphyrin 2D-COFs grown at a solid-vapour interface. XPS shows that covalent links between porphyrins consist of a mixture of imines and hemiaminals, a non-conjugated intermediate in the Schiff-base condensation reaction. These results demonstrate that environmental conditions during growth can have an important impact on the chemical composition of Schiff-base 2D-COFs.

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“…34 Unless otherwise noted, all images presented here were obtained in the ESEM mode under fairly high relative humidity (>50%). This microscope has a sample chamber which utilizes differential pumping, allowing for samples to be held at pressures of up to 2700 Pa.…”

Section: Em Imagingmentioning

confidence: 99%

Monitoring pattern formation in drying and wetting dispersions of gold nanoparticles by ESEM

Kunstmann‐Olsen

Belić

2015

Faraday Discuss.

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We report an investigation of the self-assembly of patterns from functionalized gold nanoparticles (GNPs) by monitoring the process in situ by environmental scanning electron microscopy (ESEM) during both evaporation and condensation of the dispersant. As this method limits the choice of dispersants to water, GNPs functionalized with hydrophilic thiol ligands, containing poly(ethylene)glycol (PEG) groups, were used on a variety of substrates including pre-patterned ones. Particular emphasis was given to early stage deposition of GNPs, as well as redispersion and lift-off upon condensation of water droplets. ESEM presents a unique opportunity of directly imaging such events in situ. It was found that attractive interactions between the substrate and the GNPs are often stronger than expected once the particles have been deposited. The role of nickel perchlorate as a highly water-soluble additive was studied. It was found that entropically driven deposition of particles and decoration of surface features was enhanced in its presence, as expected.

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Dewetting of Au nanoparticle assemblies

Cited by 13 publications

References 37 publications

Formation and composition of adsorbates on hydrophobic carbon surfaces from aqueous laccase-maltodextrin mixture suspension

Formation and composition of adsorbates on hydrophobic carbon surfaces from aqueous laccase-maltodextrin mixture suspension

Probing the chemical structure of monolayer covalent-organic frameworks grown via Schiff-base condensation reactions

Monitoring pattern formation in drying and wetting dispersions of gold nanoparticles by ESEM

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