Super-resolution microscopy on single particles at fluid interfaces reveals their wetting properties and interfacial deformations

A. Aloi (Corresponding author), N. Vilanova, L. Isa, A.M. de Jong, I.K. Voets (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

Uittreksel

Solid particles adsorbed at fluid interfaces are crucial for the mechanical stability of Pickering emulsions. The key parameter which determines the kinetic and thermodynamic properties of these colloids is the particle contact angle, Several methods have recently been developed to measure the contact angle of individual particles adsorbed at liquid-liquid interfaces, as morphological and chemical heterogeneities at the particle surface can significantly affect. However, none of these techniques enables the simultaneous visualization of the nanoparticles and the reconstruction of the fluid interface to which they are adsorbed, in situ. To tackle this challenge, we utilize a newly developed super-resolution microscopy method, called iPAINT, which exploits non-covalent and continuous labelling of interfaces with photo-activatable fluorescent probes. Herewith, we resolve with nanometer accuracy both the position of individual nanoparticles at a water-octanol interface and the location of the interface itself. First, we determine single particle contact angles for both hydrophobic and hydrophilic spherical colloids. These experiments reveal a non-negligible dependence of on particle size, from which we infer an effective line tension, τ. Next, we image elliptical particles at a water-decane interface, showing that the corresponding interfacial deformations can be clearly captured by iPAINT microscopy.

TaalEngels
Pagina's6654-6661
Aantal pagina's8
TijdschriftNanoscale
Volume11
Nummer van het tijdschrift14
DOI's
StatusGepubliceerd - 14 apr 2019

Vingerafdruk

Wetting
Microscopic examination
Contact angle
Fluids
Colloids
Nanoparticles
Octanols
Water
Mechanical stability
Liquids
Emulsions
Fluorescent Dyes
Labeling
Particles (particulate matter)
Thermodynamic properties
Visualization
Particle size
Kinetics
Experiments

Citeer dit

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title = "Super-resolution microscopy on single particles at fluid interfaces reveals their wetting properties and interfacial deformations",
abstract = "Solid particles adsorbed at fluid interfaces are crucial for the mechanical stability of Pickering emulsions. The key parameter which determines the kinetic and thermodynamic properties of these colloids is the particle contact angle, Several methods have recently been developed to measure the contact angle of individual particles adsorbed at liquid-liquid interfaces, as morphological and chemical heterogeneities at the particle surface can significantly affect. However, none of these techniques enables the simultaneous visualization of the nanoparticles and the reconstruction of the fluid interface to which they are adsorbed, in situ. To tackle this challenge, we utilize a newly developed super-resolution microscopy method, called iPAINT, which exploits non-covalent and continuous labelling of interfaces with photo-activatable fluorescent probes. Herewith, we resolve with nanometer accuracy both the position of individual nanoparticles at a water-octanol interface and the location of the interface itself. First, we determine single particle contact angles for both hydrophobic and hydrophilic spherical colloids. These experiments reveal a non-negligible dependence of on particle size, from which we infer an effective line tension, τ. Next, we image elliptical particles at a water-decane interface, showing that the corresponding interfacial deformations can be clearly captured by iPAINT microscopy.",
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Super-resolution microscopy on single particles at fluid interfaces reveals their wetting properties and interfacial deformations. / Aloi, A. (Corresponding author); Vilanova, N.; Isa, L.; de Jong, A.M.; Voets, I.K. (Corresponding author).

In: Nanoscale, Vol. 11, Nr. 14, 14.04.2019, blz. 6654-6661.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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