The structure of D2O-nonane nanodroplets

Pathak, Harshad; Obeidat, Abdalla; Wilemski, Gerald; Wyslouzil, Barbara E.

doi:10.1063/1.4881423

Cited by 11 publications

(22 citation statements)

References 32 publications

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“…67,70,96 The contact angles predicted from the experimental surface tensions 88,97,98 at 308 K are 23° and 19.4° in the Young and Neumann regimes, respectively, and quite insensitive to temperature (e.g. with the surface tension values at 283 K, Young's equation predicts θ = 26°, and with surface tensions extrapolated to 233 K, it predicts θ = 29°).…”

Section: Figure 4 Sensitivity Of the Contact Angle Of Water-nonane Nmentioning

confidence: 97%

“…In this work, we consider that W forms a sphere that is partially wetted by O. This has been called the idealized "Russian doll" 67 Internal structure of two-phase partial wetting droplets. A) Liquid-vapor contour of two-phase droplets with a contact angle between the W and O phases of radii !…”

Section: Free Energy Of Two-phase Aerosols Is a Function Of Their Intmentioning

confidence: 99%

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Morphology of Liquid–Liquid Phase Separated Aerosols

Qiu

Molinero

2015

J. Am. Chem. Soc.

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The morphology of liquid-liquid phase separated aerosols has a strong impact on their rate of gas and water uptake, and the type and rate of heterogeneous reactions in the atmosphere. However, it is extremely challenging to experimentally distinguish different morphologies (core-shell or partial wetting) of aerosols and to quantify the extent of wetting between the two phases. The aim of this work is to quantitatively predict the morphology of liquid-liquid aerosols from fundamental physical properties of the aerosol phases. We determine the equilibrium structure of liquid-liquid phase separated aerosols through free energy minimization and predict that the contact angle between the two liquids in the aerosol depends on the composition but not the amount of each phase. We demonstrate that for aerosols of diameter larger than ∼100 nm, the equilibrium contact angle can be accurately predicted from the surface tensions of each liquid with the vapor and between the two liquids through an expression that is identical to Young's equation. The internal structure of smaller, ultrafine aerosols depends also on the value of the line tension between the two liquids and the vapor. The thermodynamic model accurately predicts the experimental morphology, core-shell or partial wetting, of all aerosols for which surface tensions are provided in the literature, and provides contact angles that cannot be accurately determined with state of the art experimental methods. We find that the contact angle of model atmospheric aerosols is rarely higher than 30°. We validate the thermodynamic predictions through molecular simulations of nonane-water droplets, and use the simulation data to compute line tension values that are in good agreement with theory and the analysis from experimental data in water-nonane droplets. Our finding of a simple analytical equation to compute the contact angle of liquid-liquid droplets should have broad application for the prediction of the morphology of two-phase atmospheric aerosols and its impact in their chemistry.

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Section: Figure 4 Sensitivity Of the Contact Angle Of Water-nonane Nmentioning

confidence: 97%

Section: Free Energy Of Two-phase Aerosols Is a Function Of Their Intmentioning

confidence: 99%

Morphology of Liquid–Liquid Phase Separated Aerosols

Qiu

Molinero

2015

J. Am. Chem. Soc.

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“…Obeidat et al developed an analytical form factor of a Russian doll particle . This allowed them to calculate the contact angle between the two liquids under various conditions . Similarly, the form factors of Janus particles with spherical and cylindrical shapes were developed .…”

Section: Particle Scatteringmentioning

confidence: 99%

“…109 This allowed them to calculate the contact angle between the two liquids under various conditions. 110 Similarly, the form factors of Janus particles with spherical and cylindrical shapes were developed. 111 Later, Fuẗterer et al developed the form factor of a Janus particle with a core−shell morphology, where the shell had two distinct parts.…”

Section: Form Factor Analysismentioning

confidence: 99%

“…This type of analysis would be challenging with transmission mode measurements; because of the alignment of the superlattice with the direction of the beam, several peaks would not be in a Bragg condition and thus forbidden. Significantly, the superlattice orientation was affected by the type of DNA on the substrate, allowing for a (100) or (110) texture. This result could be explained by maximizing the number of DNA interconnects at the interface between the substrate and superlattice.…”

Section: Nanoparticle Assemblymentioning

confidence: 99%

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Small Angle X-ray Scattering for Nanoparticle Research

2016

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X-ray scattering is a structural characterization tool that has impacted diverse fields of study. It is unique in its ability to examine materials in real time and under realistic sample environments, enabling researchers to understand morphology at nanometer and angstrom length scales using complementary small and wide angle X-ray scattering (SAXS, WAXS), respectively. Herein, we focus on the use of SAXS to examine nanoscale particulate systems. We provide a theoretical foundation for X-ray scattering, considering both form factor and structure factor, as well as the use of correlation functions, which may be used to determine a particle's size, size distribution, shape, and organization into hierarchical structures. The theory is expanded upon with contemporary use cases. Both transmission and reflection (grazing incidence) geometries are addressed, as well as the combination of SAXS with other X-ray and non-X-ray characterization tools. We conclude with an examination of several key areas of research where X-ray scattering has played a pivotal role, including in situ nanoparticle synthesis, nanoparticle assembly, and operando studies of catalysts and energy storage materials. Throughout this review we highlight the unique capabilities of X-ray scattering for structural characterization of materials in their native environment.

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Chemie mit Überschall: 30 Jahre astrochemische Forschung und künftige Herausforderungen

et al. 2017

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Das interstellare Medium ist für uns von großem Interesse. Hier werden Sterne und Planeten geboren und wahrscheinlich sind von hier molekulare Vorstufen des Lebens zur Erde gelangt. Um die chemischen Wege zur Bildung von Sternen, Planeten und biologischen Molekülen zu verstehen, sollten astronomische Beobachtungen, astrochemische Modellierung und Laborastrochemie Hand in Hand arbeiten. Hier stellen wir Laborexperimente vor, die sich der Untersuchung der Reaktionsdynamik von astrochemisch interessanten Spezies bei Temperaturen des interstellaren Mediums widmen und die unter Verwendung von CRESU, einer der populärsten Techniken in diesem Bereich, durchgeführt wurden. Außerdem diskutieren wir neue technische Entwicklungen und wissenschaftliche Ideen zur CRESU, die unser Verständnis der astrochemischen Geschichte und Zukunft unseres Universums einen Schritt weiter bringen könnten.

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The structure of D2O-nonane nanodroplets

Cited by 11 publications

References 32 publications

Morphology of Liquid–Liquid Phase Separated Aerosols

Morphology of Liquid–Liquid Phase Separated Aerosols

Small Angle X-ray Scattering for Nanoparticle Research

Chemie mit Überschall: 30 Jahre astrochemische Forschung und künftige Herausforderungen

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