Silica nanoparticle sols. Part 3: Monitoring the state of agglomeration at the air/water interface using the Langmuir–Blodgett technique

Blute, Irena; Pugh, R.J.; Pas, John van de; Callaghan, I. C.

doi:10.1016/j.jcis.2009.04.039

Cited by 24 publications

(15 citation statements)

References 18 publications

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“…The dilational viscoelasticity (or complex dilational modulus) of the interface was measured by the oscillating drop method using the PAT-1. For low amplitude perturbations of the interface, the dilational viscoelasticity (E) can be defined as the response of the interfacial tension (γ) to the relative variation of the surface area (A) = δγ δ E A ln (1) As explained elsewhere, 30 E is a complex modulus, dependent on the area perturbation frequency. The real part expresses the dilational elasticity of the layer while the imaginary part expresses its viscosity.…”

Section: Dilational Rheologymentioning

confidence: 99%

Properties of Fatty Amine–Silica Nanoparticle Interfacial Layers at the Hexane–Water Interface

et al. 2012

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The formation and properties of composite layers of silica nanoparticles and an oil-soluble (fatty) amine surfactant at the oil−water interface have been studied using interfacial tensiometry, rheology, and contact angle measurements to characterize the synergy between the particles and surfactant. The initially hydrophilic particles interact with the surfactant only at the water−hexane interface. Synergistic interactions are required for interface stabilization. A key result is that nanoparticle attachment is driven by surfactant adsorption at the liquid interface. Particles are efficiently bound to the interface once the adsorbed surfactant layer is close to saturation. Surfactant adsorption onto the particle surfaces optimizes the particle wettability and promotes particle aggregation into networks that enhance the viscoelasticity of the interface. The implications of these results for controlling the formation and kinetic stability of emulsions containing particles and surfactant are discussed.

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Section: Dilational Rheologymentioning

confidence: 99%

Properties of Fatty Amine–Silica Nanoparticle Interfacial Layers at the Hexane–Water Interface

et al. 2012

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“…6 It is believed that the enhanced stability of Pickering emulsions and foams stems from the formation of an aggregated particulate layer that arrests the coalescence of droplets and bubbles. 3,7 Thus, the mechanical properties of such particle-laden interfaces play a crucial role in achieving stability. 8 Furthermore, in many of the aforementioned applications, the interface undergoes large deformations that produce compression and shear stresses; hence, an effective stabilization heavily depends on the flow behavior of the colloidal monolayers.…”

Section: ■ Introductionmentioning

confidence: 99%

Collapse of Particle-Laden Interfaces under Compression: Buckling vs Particle Expulsion

Razavi

Cao²,

Lin³

et al. 2015

Langmuir

151

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Colloidal particles can bind to fluid interfaces with a capillary energy that is thousands of times the thermal energy. This phenomenon offers an effective route to emulsion and foam stabilization where the stability is influenced by the phase behavior of the particle-laden interface under deformation. Despite the vast interest in particle-laden interfaces, the key factors that determine the collapse of such an interface under compression have remained relatively unexplored. In this study, we illustrate the significance of the particle surface wettability and presence of electrolyte in the subphase on interparticle interactions at the interface and the resulting collapse mode. Various collapse mechanisms including buckling, particle expulsion, and multilayer formation are reported and interpreted in terms of particle-particle and particle-interface interactions.

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“…This technique has some specific requirements such as a sophisticated experimental device and hydrophobicity of the nanoparticles. 5,6 In the present work, we apply the emerging "bubble deposition method" (BDM) to hydrophilic CeVO 4 nanowire systems. The BDM is a powerful way to control the deposition and organization of various nano-object films.…”

Section: Introductionmentioning

confidence: 99%

Role of Substrate Wettability in the “Bubble Deposition Method” Applied to the CeVO₄ Nanowire Films

Costa-Coquelard

Jégou²,

Benattar

2011

Langmuir

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Homogeneous two-dimensional structures of CeVO(4) nanowires (NWs) deposited on silicon substrates are obtained by means of the bubble deposition method (BDM). Surface wettability (i.e., surface energy) and film ripening (i.e., film thickness) are two major parameters in nanoparticle confinement and deposition. As the presence of surfactant could be detrimental to applications, a washing treatment is developed without CeVO(4) chemical changes or NW film modifications. Careful investigations of the film topography are carried out by atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) is used to check the chemical composition of the film at different stages. Finally, samples made by BDM are compared to those made by dip-coating method, demonstrating the higher efficiency of the BDM in providing large areas of well-organized and dense CeVO(4) monolayer.

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Silica nanoparticle sols. Part 3: Monitoring the state of agglomeration at the air/water interface using the Langmuir–Blodgett technique

Cited by 24 publications

References 18 publications

Properties of Fatty Amine–Silica Nanoparticle Interfacial Layers at the Hexane–Water Interface

Properties of Fatty Amine–Silica Nanoparticle Interfacial Layers at the Hexane–Water Interface

Collapse of Particle-Laden Interfaces under Compression: Buckling vs Particle Expulsion

Role of Substrate Wettability in the “Bubble Deposition Method” Applied to the CeVO₄ Nanowire Films

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Silica nanoparticle sols. Part 3: Monitoring the state of agglomeration at the air/water interface using the Langmuir–Blodgett technique

Cited by 24 publications

References 18 publications

Properties of Fatty Amine–Silica Nanoparticle Interfacial Layers at the Hexane–Water Interface

Properties of Fatty Amine–Silica Nanoparticle Interfacial Layers at the Hexane–Water Interface

Collapse of Particle-Laden Interfaces under Compression: Buckling vs Particle Expulsion

Role of Substrate Wettability in the “Bubble Deposition Method” Applied to the CeVO4 Nanowire Films

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About

Role of Substrate Wettability in the “Bubble Deposition Method” Applied to the CeVO₄ Nanowire Films