Optoacoustic determination of analytical parameters and physicochemical constants in highly concentrated solutions of chromophores

Lobko, Kristina V.; Shishkin, M. A.; Filimonova, T.A.; Volkov, Dmitry S.; Pelivanov, Ivan; Проскурнин, М. А.

doi:10.1016/j.talanta.2017.06.001

Cited by 2 publications

(2 citation statements)

References 69 publications

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“…The advantage of this technique is that it provides the reliable information on the light absorption coefficients against large light-scattering coefficients [ 45 , 65 ]. It is used for measurements of laser fluence distribution [ 44 , 66 , 67 ] and found application in physicochemical and biological studies [ 61 , [68] , [69] , [70] , [71] , [72] , [73] ]. This technique was applied to study the absorption at 532 nm of ND dispersions.…”

Section: Resultsmentioning

confidence: 99%

Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

et al. 2018

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The multispectral modality and technique for optically dense samples of optoacoustic spectroscopy were applied to measure spectra and high absorbances of concentrated aqueous dispersions of undoped nanodiamonds. The data from optoacoustic and optical transmission measurements and DSC data of the mean particle size by the Gibbs–Kelvin equation are compared to estimate the difference in composition of various nanodiamond trademarks. Optoacoustic spectra confirm the contribution of surface dimer chains into the absorption of nanodiamonds in the long wavelength range. Optoacoustic and conventional absorption spectra of aqueous solutions of nanodiamond fractions after centrifugation (15300g) and ultracentrifugation (130000g) revealed a separation of a highly absorbing non-diamond sp2 phase. The two-step separation by ultracentrifugation followed by extra centrifugation made it possible to isolate a highly absorbing and soluble nanodiamond phase with the particle size of 3.6 nm, showing a change in spectra compared to the starting nanodiamond material.

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Section: Resultsmentioning

confidence: 99%

Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

et al. 2018

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“…The PA method was first applied (to our knowledge) to accurately measure the light absorption coefficient in homogeneously absorbing solutions in 69 , which was then extended to strongly scattering (or turbid) media 4 , 5 , 70 – 72 . Recently, the method was proposed and applied in analytic chemistry to analyze optically dense solutions 73 , 74 .…”

Section: Methodsmentioning

confidence: 99%

Molecular fingerprinting of nanoparticles in complex media with non-contact photoacoustics: beyond the light scattering limit

Pelivanov

Петрова

Yoon

et al. 2018

Sci Rep

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Optical instruments can probe physical systems even to the level of individual molecules. In particular, every molecule, solution, and structure such as a living cell has a unique absorption spectrum representing a molecular fingerprint. This spectrum can help identify a particular molecule from others or quantify its concentration; however, scattering limits molecular fingerprinting within a complex compound and must be overcome. Here, we present a new, non-contact photoacoustic (PA)-based method that can almost completely remove the influence of background light scattering on absorption measurements in heterogeneous highly scattering solutions and, furthermore, separate the intrinsic absorption of nanoscale objects from their scattering. In particular, we measure pure absorption spectra for solutions of gold nanorods (GNRs) as an example of a plasmonic agent and show that these spectra differ from the extinction measured with conventional UV-VIS spectrophotometry. Finally, we show how the original GNR absorption changes when nanoparticles are internalized by cells.

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Optoacoustic determination of analytical parameters and physicochemical constants in highly concentrated solutions of chromophores

Cited by 2 publications

References 69 publications

Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies

Molecular fingerprinting of nanoparticles in complex media with non-contact photoacoustics: beyond the light scattering limit

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