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DSC and Raman study of phase transitions in diphenylalanine nanotubes / P. Zelenovskiy [и др.] // The 8th International Conference on Advanced Vibrational Spectroscopy at TU Wien : abstracts. - 2015. - P. 54 . - ISBN 978-3-200-04205-6

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Доп.точки доступа:
Zelenovskiy, P.; Davydov, A.; Vasilev, S.; Nuraeva, A.; Ryan, K.; Krylov, A. S.; Крылов, Александр Сергеевич; Wojtas, M.; Shur, V. Y.; Kholkin, A. I.; International conference on advanced vibrational spectroscopy at TU wien(8 ; 2015 ; July ; 12-17 ; Vienna, Austria)
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    Raman study of structural transformations in self-assembled diphenylalanine nanotubes at elevated temperatures / P. S. Zelenovskiy [et al.] // J. Raman Spectrosc. - 2017. - Vol. 48, Is. 11. - P. 1401-1405, DOI 10.1002/jrs.5084. - Cited References:50. - The equipment of the Ural Center for Shared Use 'Modern nanotechnology' UrFU was used. The research was supported by the President of Russian Federation grant for young scientists (Contract 14.Y30.15.6554-MK) and by the Government of the Russian Federation (Act 211, Agreement 02.A03.21.0006). A.K. acknowledges the Turkish-Portuguese project TUBITAK/0006/2014 and CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM/50011/2013) financed by national funds through the FCT/MEC and, when applicable, co-financed by FEDER under the PT2020 Partnership Agreement. . - ISSN 0377-0486. - ISSN 1097-4555
   Перевод заглавия: Исследование структурных превращений в самоорганизованных дифенилаланиновых нанотрубках при повышенных температурах методом комбинационного рассеяния света

РУБ Spectroscopy
Рубрики:
PEPTIDE NANOTUBES
   PIEZOELECTRIC PROPERTIES
   WATER
   MICROTUBES
Кл.слова (ненормированные):
peptide nanotubes -- diphenylalanine -- phase transition -- cyclization -- water
Аннотация: Self-assembled peptide diphenylalanine (NH2-Phe-Phe-COOH, FF) is one of the most important emergent functional materials, demonstrating wide range of fascinating physical and chemical properties including biocompatibility, chemical variability, exceptional rigidity, outstanding piezoelectric, pyroelectric and ferroelectric responses. Up to now, the phase transitions in FF nanotubes were investigated by scanning and transmission electron microscopy, atomic force microscopy, differential scanning calorimetry, thermogravimetry and mass spectroscopy. The Raman spectroscopy was implemented at room temperature only, and the microscopic details of these transitions remained unknown. In this work, the structural transformations in FF nanotubes at elevated temperatures (up to tubes destruction at 160 °C) were studied by Raman spectroscopy. Two structural transformations were observed in this region: hexagonal to orthorhombic transition at about 100 °C and the cyclization of FF molecules at about 150 °C. For the first time, these transformations were considered in the context of reconstruction of the water subsystem in the nanotubes, thus demonstrating the strong relation between the peptide tube and the state of the water inside. Using an effective frequency of nanotubes' lattice vibrations, we found that many effects observed earlier by other methods are induced by the variation of the water subsystem. The analysis of certain lines in the middle part of the Raman spectrum allowed us to describe the microscopic details of FF molecule cyclization. These results improve the understanding of the role of water in the origin of outstanding properties of FF nanotubes and thus promote developing new functional devices on their basis.

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Доп.точки доступа:
Zelenovskiy, P. S.; Davydov, A. O.; Krylov, A. S.; Крылов, Александр Сергеевич; Kholkin, A. L.; International GeoRAMAN Conference(12th ; June 9-15, 2016 ; Novosibirsk, Russia)
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Non-hydrostatic pressure-induced phase transitions in self-assembled diphenylalanine microtubes / A. Krylov [et al.] // Tech. Phys. - 2018. - Vol. 63, Is. 9. - P. 1311-1315, DOI 10.1134/S1063784218090098. - Cited References: 17. - This study was supported by the Turkish-Portuguese project no. TUBITAK/0006/2014. . - ISSN 1063-7842. - ISSN 1090-6525

РУБ Physics, Applied
Рубрики:
PEPTIDE NANOTUBES
CRYSTAL
Аннотация: The structural phase transitions in diphenylalanine microtubes caused by an increase in the non-hydrostatic pressure have been examined. Raman scattering investigations have been carried out and the results obtained have been interpreted and analyzed. Spectral variations in the ranges of phenyl ring vibrations and high-frequency oscillations of NH and CH groups have been analyzed. Under pressures of up to 9.8 GPa, four spectral anomalies indicative of the occurrence of phase transitions have been observed. The transitions under pressures of 1.7 and 4 GPa are shown to be reversible. The transition at 5.7 GPa is accompanied by partial sample amorphization.

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Публикация на русском языке Фазовые переходы в самоорганизованных микротрубках дифенилаланина, индуцированные негидростатическим давлением [Текст] / А. С. Крылов [и др.] // Журн. техн. физ. - 2018. - Т. 88 Вып. 9. - С. 1355-1358

Держатели документа:
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk Sci Ctr, Krasnoyarsk 660036, Russia.
Univ Aveiro, Mat Inst Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
Univ Aveiro, Mat Inst Aveiro, CICECO, P-3810193 Aveiro, Portugal.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Kopyl, S.; Kholkin, A.; [TUBITAK/0006/2014]
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Raman spectra of diphenylalanine microtubes: polarisation and temperature effects / A. Krylov, S. Krylova, S. Kopyl [et al.] // Crystals. - 2020. - Vol. 10, Is. 3. - Ст. 224, DOI 10.3390/cryst10030224. - Cited References: 43. - This research was funded by the Russian Foundation for Basic Research grant number 18-02-00754, F.S. thanks Scientific and Technological Research Council of Turkey for support under Grant Number 115F227. S.Kopyl and A.Kholkin thank the joint project Portugal-Turkey TUBITAK/0006/2014. This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, refs. UIDB/50011/2020 & UIDP/50011/2020, financed by national funds through the FCT/MEC. S.Kopyl, P.Z. and A.Kholkin were partly supported by FCT (Portugal) through the project "BioPiezo"-PTDC/CTM-CTM/31679/2017 (CENTRO-01-0145-FEDER-031679). Part of this work was funded by national funds (OE), through FCT-Fundacao para a Ciencia e a Tecnologia, I.P., in the scope of the framework contract foreseen in the numbers 4, 5, and 6 of the article 23, of the Decree-Law 57/2016, of 29 August, changed by Law 57/2017, of 19 July. . - ISSN 2073-4352

РУБ Crystallography + Materials Science, Multidisciplinary
Рубрики:
PIEZOELECTRIC PROPERTIES
   PHASE-TRANSITIONS
   SPECTROSCOPY
   SCATTERING
Кл.слова (ненормированные):
diphenylalanine -- Raman spectra -- phase transition -- polarisation -- temperature effects
Аннотация: Diphenylalanine microtubes have remarkable physical properties that allow one to use them in electronics. In this work, we measured polarised temperature-dependent Raman spectra in self-assembled diphenylalanine microtubes grown from the solution. We observed the anomalous temperature behaviour of the Raman lines. Their temperature changes were minimal, which required a significant improvement in the resolution and stability of Raman measurements. The anomalies in the behaviour of the spectra at about 178 K, 235 K, 255 K, 278 K, 296 K, 398 K and 412 K were observed. The structural phase transition at 398 K is irreversible. This transition is associated with the release of water molecules from nanochannels. The irreversible phase transition has a temperature range of about 10 K.

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Держатели документа:
Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Univ Aveiro, Dept Phys, P-3810193 Aveiro, Portugal.
Univ Aveiro, CICECO Mat Inst Aveiro, P-3810193 Aveiro, Portugal.
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia.
Istanbul Tech Univ, Dept Phys Engn, TR-34469 Istanbul, Turkey.
Ural Fed Univ, Inst Nat Sci & Math, Ekaterinburg 620026, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.

Доп.точки доступа:
Krylov, A. S.; Крылов, Александр Сергеевич; Krylova, S. N.; Крылова, Светлана Николаевна; Kopyl, Svitlana; Salehli, Ferid; Zelenovskiy, Pavel; Vtyurin, A. N.; Втюрин, Александр Николаевич; Kholkin, Andrei; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-02-00754]; Scientific and Technological Research Council of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [115F227]; project Portugal-Turkey [TUBITAK/0006/2014]; FCT/MEC [UIDB/50011/2020, UIDP/50011/2020]; FCT (Portugal) through the project "BioPiezo" [PTDC/CTM-CTM/31679/2017 (CENTRO-01-0145-FEDER-031679)]; national funds (OE), through FCT-Fundacao para a Ciencia e a Tecnologia, I.P.
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