Pure Liquids: Extended Data

Wohlfarth, Ch.; Wohlfarth, B.

doi:10.1007/10478514_7

Cited by 4 publications

(3 citation statements)

References 412 publications

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“…In Figure 2A, we show the RI of pentaethylene glycol measured during the evaporation of a ∼5300 nm droplet over 2000 s. The RI remained constant over the course of the experiment, indicating a pure singlecomponent droplet. The experimental RI was measured to be about 0.007 higher than the literature values (∼1.462 at 25 °C) reported by Mori, 45 Wohlfarth et al, 46 and Gallaugher and Hibbert. 42 The size evolution of the pentaethylene glycol droplet is shown in Figure 2B, and a representative comparison of the measured spectra with a simulation using the Mie theory, using the parameters derived from MRFIT is shown in Figure 2C.…”

Section: Resultscontrasting

confidence: 54%

Simultaneous Retrieval of the Size and Refractive Index of Suspended Droplets in a Linear Quadrupole Electrodynamic Balance

et al. 2020

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Single-particle trapping is an effective strategy to explore the physical and optical properties of aerosol with high precision. Laser-based methods are commonly used to probe the size, optical properties, and composition of nonlightabsorbing droplets in optical and electrodynamic traps. However, these methods cannot be applied to droplets containing photoactive chromophores, and thus, singleparticle methods have been restricted to only a subset of atmospherically relevant particle compositions. In this work, we explore the application of a broadband light scattering approach, Mie resonance spectroscopy, to simultaneously probe the size and the refractive index (RI) of droplets in a linear quadrupole electrodynamic balance. We examine the evaporation of poly(ethylene glycol)s and compare the calculated vapor pressures with literature values to benchmark the size accuracy without prior constraint on the RI. We then explore the hygroscopic growth and deliquescence of sodium chloride droplets, measuring RI at the deliquescence relative humidity and demonstrating agreement to literature values. These data allow the wavelength dependence of the RI of aqueous NaCl to be determined using a first-order Cauchy equation, and we effectively reproduce literature data from multiple techniques. We finally discuss measurements from a light-absorbing aqueous droplet containing humic acid and interpret the spectra via the imaginary component of the RI. The approach described here allows the radius of nonabsorbing droplets to be determined within 0.1%, the refractive index within 0.2%, and the first-order term in the Cauchy dispersion equation within ∼5%.

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Section: Resultscontrasting

confidence: 54%

Simultaneous Retrieval of the Size and Refractive Index of Suspended Droplets in a Linear Quadrupole Electrodynamic Balance

et al. 2020

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“…These accurate values can be used as absolute reference standards for FCS. As is the case for water, knowledge of the temperature dependence of the viscosity of the organic solvent allows to calculate a reference diffusion constant at different temperatures. − Low molecular weight fluorescent molecules have the advantage of high purity and monodispersity (spectroscopic purity in the visible spectrum can be easily checked, for instance, by thin layer chromatography (TLC)), solubility in a range of organic solvents and a lower tendency for aggregation than high molecular weight species, and they are widely commercially availableoften in fairly large amounts for a reasonable price.…”

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confidence: 99%

Accurate Diffusion Coefficients of Organosoluble Reference Dyes in Organic Media Measured by Dual-Focus Fluorescence Correlation Spectroscopy

et al. 2015

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Dual-focus fluorescence correlation spectroscopy (2fFCS) is a versatile method to determine accurate diffusion coefficients of fluorescent species in an absolute, reference-free manner. Whereas (either classical or dual-focus) FCS has been employed primarily in the life sciences and thus in aqueous environments, it is increasingly being used in materials chemistry, as well. These measurements are often performed in nonaqueous media such as organic solvents. However, the diffusion coefficients of reference dyes in organic solvents are not readily available. For this reason we determined the translational diffusion coefficients of several commercially available organosoluble fluorescent dyes by means of 2fFCS. The selected dyes and organic solvents span the visible spectrum and a broad range of refractive indices, respectively. The diffusion coefficients can be used as absolute reference values for the calibration of experimental FCS setups, allowing quantitative measurements to be performed. We show that reliable information about the hydrodynamic dimensions of the fluorescent species (including noncommercial compounds) within organic media can be extracted from the 2fFCS data.

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“…This step is necessary for obtaining the true values of the quantities without interference from inter-nanosheet forces at increasing concentration. The viscosities, refractive indices, and dielectric constants of each solvent mixture required for size and ζ potential measurements were obtained from the literature. ,, The refractive indices and dielectric constants of diethylenetriamine/water mixtures are not yet available in the literature; thus, size and ζ potential measurements by dynamic light scattering were not conducted for those samples. Raman spectra were obtained with a Horiba Scientific LabRam HR Revolution using an Ar laser at 514 nm with a 100× objective lens.…”

Section: Methodsmentioning

confidence: 99%

Introducing Normalized Centrifugation for a More Accurate Thermodynamic Analysis of Molybdenum Disulfide Dispersions: A Study on Mixed Solvents of Alcohols and Amines with Water

Alzakia

Sun²,

Pennycook

et al. 2019

ACS Appl. Mater. Interfaces

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A more accurate solution thermodynamic analysis of colloidal molybdenum disulfide (MoS 2 ) nanosheets dispersed in 91 combinations of organic solvent (alcohols and amines)/water mixtures is made possible by the application of a viscosity-and density-normalized centrifugation method to the post-sonication stock solution. This centrifugation method accounts the solvent mixture's density and viscosity in order to apply different centrifugation times based on Stoke's law and in effect eliminates the kinetic interferences arising from different densities and viscosities of the solvent mixtures used as the dispersing media. This allows us to reveal that the solvent's molecular size and hydrogenbonding strength are additional important factors that determine the Gibbs free energy of mixing, other than the matching of the Hansen solubility parameters between the dispersed nanosheet and the dispersing medium. In addition, ζ potential turns out to be a negligible factor for the nanosheet dispersibility since surface charges are mainly localized on the edge sites. This is because restacking mainly occurs via the basal planes, which are virtually chargeless. This study further extends our understanding of the dispersibility mechanism of 2D nanosheets in various solvent/water mixtures.

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Pure Liquids: Extended Data

Cited by 4 publications

References 412 publications

Simultaneous Retrieval of the Size and Refractive Index of Suspended Droplets in a Linear Quadrupole Electrodynamic Balance

Simultaneous Retrieval of the Size and Refractive Index of Suspended Droplets in a Linear Quadrupole Electrodynamic Balance

Accurate Diffusion Coefficients of Organosoluble Reference Dyes in Organic Media Measured by Dual-Focus Fluorescence Correlation Spectroscopy

Introducing Normalized Centrifugation for a More Accurate Thermodynamic Analysis of Molybdenum Disulfide Dispersions: A Study on Mixed Solvents of Alcohols and Amines with Water

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