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Your search keyword '"Novikov, Vladimir N."' showing total 18 results
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18 results on '"Novikov, Vladimir N."'

1. Anomalously large isotope effect in the glass transition of water

Author

Gainaru, Catalin, Agapov, Alexander L., Fuentes-Landete, Violeta, Amann-Winkel, Katrin, Nelson, Helge, Köster, Karsten W., Kolesnikov, Alexander I., Novikov, Vladimir N., Richert, Ranko, Böhmer, Roland, Loerting, Thomas, and Sokolov, Alexei P.

Published
2014

3. Pressure dependence of Poisson’s ratio of glassy Baltic amber studied by Brillouin scattering spectroscopy

Author

Tkachev, Sergey N, Aihaiti, Muhetaer, Novikov, Vladimir N, and Kojima, Seiji

Subjects
Uncategorized
Abstract

Amber is a typical natural glass with very long aging time. Elastic properties of amber at high pressures have been studied using Brillouin scattering and a diamond anvil cell. Both longitudinal and transverse acoustic modes have been observed up to 12 GPa. The pressure dependences of longitudinal, shear, Young's, and bulk moduli, compressibility, and Poisson's ratio were determined. The longitudinal, shear, Young's, bulk moduli show the remarkable increase, and compressibility shows a marked decrease with increasing pressure. However, it is found that the pressure dependence of Poisson's ratio is very small. The mechanism of this small pressure dependence was discussed. The Cauchy type relation between longitudinal and shear moduli was examined. Its coefficients show the deviation from the Cauchy relation owing to the coexistence of different intermolecular interactions in amber.

Published
2022
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10. Effect of Chain Rigidity on the Decoupling of Ion Motion from Segmental Relaxation in Polymerized Ionic Liquids: Ambient and Elevated Pressure Studies

Author

Wojnarowska, Zaneta, primary, Feng, Hongbo, additional, Fu, Yao, additional, Cheng, Shiwang, additional, Carroll, Bobby, additional, Kumar, Rajeev, additional, Novikov, Vladimir N., additional, Kisliuk, Alexander M., additional, Saito, Tomonori, additional, Kang, Nam-Goo, additional, Mays, Jimmy W., additional, Sokolov, Alexei P., additional, and Bocharova, Vera, additional

Published
2017
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18. Pressure dependence of intermediate-range order and elastic properties of glassy Baltic amber.

Author

Tkachev SN, Zoller CM, Kenney-Benson C, Ahart M, Hemley RJ, Novikov VN, and Kojima S

Abstract

Amber is a unique example of a fragile glass that has been extensively aged below its glass transition temperature, thus reaching a state that is not accessible under normal experimental conditions. We studied the medium-range order of Baltic amber by x-ray diffraction (XRD) at high pressures. The pressure dependences of the low-angle XRD intensity between 0 and 5 Å^{-1} were measured from 0 to 7.3 GPa by the energy-dispersive XRD. The first diffraction peak at 1.1 Å^{-1} and ambient pressure has a doublet structure consisting of the first sharp diffraction peak (FSDP) at 1.05 Å^{-1} and the second feature at 1.40 Å^{-1}. The peak position and the width of the FSDP increase as the pressure increases, while the intensity of the FSDP decreases. Below P_{0}=2.4 GPa, the rapid increase of the FSDP peak position was observed, while above P_{0}, the gradual increase was observed. Below P_{0}, voids and holes in a relatively low-density state are suppressed, whereas above P_{0}, the suppression becomes mild. Such a change suggests the crossover from the low- to high-density state at P_{0}. There is a close correlation between the pressure dependence of XRD and previously reported sound velocity results. The correlation between the mean-square fluctuation of the shear modulus on the nanometer scale and fragility in amber and other glass formers is also discussed.

Published
2024
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