Effects of Depolarized Scattering of Low-Frequency Radiation by Anisotropic Metallic Nanoparticles

1.

Effects of Depolarized Scattering of Low-Frequency
Radiation by Anisotropic Metallic Nanoparticles
during Swelling of a Polymer Membrane in Water
with Different Isotopic Compositions
P.N. Bоlоtskоvа1,2, N.F. Bunkin1,2, V.А. Kоzlоv1,2, S.М. Ismailov2
1-Prokhorov General Physics Institute of the Russian Academy of
Sciences
2-Bauman Moscow State Technical University

2.

Nafion
A polymer (Teflon) framework with hemmed
terminal sulfo groups

3.

Outer side of the cell membrane
H2O (157 ppm)
DDW (3 ppm)
Van den Berg, B.M.; Vink, H.; Spaan, J.A.
The endothelial glycocalyx protects against
myocardial edema, Circ. Res., 2003, 92,
592-594.
Bunkin, N.F.; Shkirin, A.V.; Kozlov, V.A.;
Ninham, B.W.; Uspenskaya, E.V.; Gudkov,S.V.
Near-surface structure of Nafion in deuterated
water, J. Chem. Phys., 2018, 149, 164901.

4.

Schematic of the setup for photoluminescence spectroscopy based on a
diode laser with a wavelength of 369 nm.
Grazing fall geometry
Spectral maximum = 460 nm
Luminescence centers:
terminal sulfo groups

5.

I t A kI pump lum nNaf ,
Intensity of luminescence
R−SO3H + Н2О R−SO3− + H3О+
Dissociation during swelling
R06
E 6 6
R0 r
R0 = 30 60 Å
Forster resonant energy transfer
Lakowicz, J.R. Principles of Fluorescence Spectroscopy; Chapter 13, Energy Transfer; Springer:
Boston, MA, USA, 2006.

6.

7.

- Noise signal frequency: 100 MHz
(no absorption in water)
- Distance to setup: 1.5 m
- Using of reflective screens
for fixing radiation

8.

17 MHz
Oscillogram from the screen of a low-frequency spectrometer

9.

10.

Spherical gold
nanoparticles
(isotropic)
Elongated gold
nanoparticles
(anisotropic)
Elongated selenium
nanoparticles
(anisotropic)

11.

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526 | Nature | Vol 601 |
27 January 2022

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TO BE CONTINUED…