E. A. Shershunova, V. V. Voevodin, S. V. Nebogatkin, K. I. Romanov, E. A. Vorotelyak, O. S. Rogovaya, A. A. Ryabinin, A. I. Kryukov, N. L. Kunelskaya, V. M. Mischenko, D. V. Yudin, M. M. Ilyin
{"title":"Electrophysical Setup for Drug Delivery through Biological Membranes","authors":"E. A. Shershunova, V. V. Voevodin, S. V. Nebogatkin, K. I. Romanov, E. A. Vorotelyak, O. S. Rogovaya, A. A. Ryabinin, A. I. Kryukov, N. L. Kunelskaya, V. M. Mischenko, D. V. Yudin, M. M. Ilyin","doi":"10.1134/S1062873824710614","DOIUrl":"10.1134/S1062873824710614","url":null,"abstract":"<p>Hearing impairments and vestibular disorders pose a significant problem, as they severely diminish a person’s quality of life. An urgent task is the development of methods for targeted drug delivery without disrupting biological barriers. One approach is the induced migration of ions via an electric field, including ionophoresis and electroporation. Ionophoresis is applicable only for ionized substances, while electroporation increases the permeability of cell membranes. To overcome the round window membrane of the inner ear, less invasive approaches using electropermeabilization, electroosmotic, and electrophoretic drug movement are necessary. In this work, an electrophysical setup for combined electroporation-ionophoresis effect on biological membranes is described. There was carried out experimental study to evaluate the electrophysical parameters that ensure high viability of cells in model biological membranes of the human round window. Preliminary results on the membranes permeability were also obtained.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S560 - S567"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. I. Kalinichenko, S. L. Korableva, M. S. Pudovkin, R. M. Rakhmatullin, A. A. Rodionov
{"title":"EPR of Ceria Nanoparticles Doped with Praseodymium and Terbium Ions","authors":"S. I. Kalinichenko, S. L. Korableva, M. S. Pudovkin, R. M. Rakhmatullin, A. A. Rodionov","doi":"10.1134/S1062873824710456","DOIUrl":"10.1134/S1062873824710456","url":null,"abstract":"<p>CeO<sub>2</sub> (ceria) nanoparticles doped with praseodymium and terbium were synthesized in two different ways, the CeO<sub>2</sub>:Pr was prepared by the solid-state reaction at room temperature, and the CeO<sub>2</sub>:Tb was prepared by co-precipitated method from aqueous solution. Electron paramagnetic spectroscopy was applied to study both types of ceria nanoparticles. It was found that praseodymium and terbium ions are mainly in a 3+ valence state, which means, they are non-Kramers ions. The charge compensators are most probably situated in the closest environment of rare earth ions. The most intensive line with <i>g</i> ∼1.97, detected in both types of samples, consists of two contributions, the typical line for CeO<sub>2</sub> nanoparticles and the line from the Gd<sup>3+</sup> trace impurity, which has the same <i>g</i>-values.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S633 - S637"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
I. D. Sidorov, M. R. Gafurov, Yu. O. Zobkova, N. V. Petrakova, V. P. Sirotinkin, V. S. Komlev
{"title":"Effect of Eu3+ Concentration on Luminescent Properties of Calcium Hydroxyapatite","authors":"I. D. Sidorov, M. R. Gafurov, Yu. O. Zobkova, N. V. Petrakova, V. P. Sirotinkin, V. S. Komlev","doi":"10.1134/S106287382471047X","DOIUrl":"10.1134/S106287382471047X","url":null,"abstract":"<p>Spectral and kinetic characteristics of calcium hydroxyapatite samples Ca<sub>10</sub>(PO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub> doped with Eu<sup>3+</sup> ion (1, 5, and 10 mol %) were studied. The hydroxyapatite samples were presented in two forms: as-synthesized powders and heat-treated powders at 1300°C in air. Under 266 nm pulse laser excitation, they exhibited luminescence by the <sup>5</sup><i>D</i><sub>0</sub> → <sup>7</sup><i>F</i><sub>J</sub> (J = 0, 1, 2, 3, 4) transitions in the range of 550–750 nm. A study of luminescence decays at emission wavelengths of 574 nm (<sup>5</sup><i>D</i><sub>0</sub> → <sup>7</sup><i>F</i><sub>0</sub> transition) and 590 nm (<sup>5</sup><i>D</i><sub>0</sub> → <sup>7</sup><i>F</i><sub>1</sub> transition) showed a complex character of luminescence decay for as-synthesized samples and predominantly monoexponential luminescence decay for heat-treated samples. With the increase of Eu<sup>3+</sup> concentration, the luminescence effective decay times for these transitions decreased for as-synthesized samples, whereas the luminescence lifetimes displayed almost the same values for the heat-treated samples.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S646 - S650"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. M. Zubareva, A. A. Shavelev, A. A. Shakirov, A. K. Ginkel, I. D. Sidorov, A. S. Nizamutdinov
{"title":"Investigation of Energy Transfer Processes in Downconversion Luminescence in BaY2F8 Crystals with Coactivation by Tb3+–Yb3+ Ions","authors":"A. M. Zubareva, A. A. Shavelev, A. A. Shakirov, A. K. Ginkel, I. D. Sidorov, A. S. Nizamutdinov","doi":"10.1134/S1062873824710419","DOIUrl":"10.1134/S1062873824710419","url":null,"abstract":"<p>The spectral and kinetic characteristics of BaY<sub>2</sub>F<sub>8</sub> crystals with coactivation by Tb–Yb ions under excitation at a wavelength of 266 nm were studied. Luminescence of Yb<sup>3+</sup> ions was detected in the NIR spectral range because of charge transfer processes. Studies at low-temperature have not shown the cooperative energy transfer, as well as single-photon processes of direct energy transfer to acceptor ions have been found. The quantum yields were measured, taking values of 70.3, 49.3, and 55.05% for 2, 5, and 10 at % ytterbium ion concentrations, respectively.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S620 - S624"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. I. Oleynikova, S. L. Korableva, O. A. Morozov, M. S. Pudovkin
{"title":"Nd3+, Yb3+:YF3 Nanosensors for Luminescent Thermometry","authors":"E. I. Oleynikova, S. L. Korableva, O. A. Morozov, M. S. Pudovkin","doi":"10.1134/S1062873824710377","DOIUrl":"10.1134/S1062873824710377","url":null,"abstract":"<p>The thermometric characteristics of Nd<sup>3+</sup> (0.5 mol %), Yb<sup>3+</sup> (0.1; 0.5; 1.0 and 2.0 mol %):YF<sub>3</sub> nanoparticles obtained by hydrothermal method are reported. The nanoparticles had a size of 234 ± 13 nm. The luminescence intensity ratio (LIR = <i>I</i><sub>Nd</sub> (<sup>4</sup><i>F</i><sub>3/2</sub> – <sup>4</sup><i>I</i><sub>9/2</sub>, ∼866 nm)/<i>I</i><sub>Yb</sub>(<sup>2</sup><i>F</i><sub>5/2</sub> – <sup>2</sup><i>F</i><sub>7/2</sub>, ∼1000 nm) of Nd<sup>3+</sup> and Yb<sup>3+</sup> emissions in the temperature range of 300–500 K was used as a temperature-dependent parameter. The LIR function exhibited a monotonic shape, which is advantageous for the application of luminescent thermometry. The maximum relative sensitivity was achieved for Nd<sup>3+</sup> (0.5 mol %), Yb<sup>3+</sup> (1.0 mol %):YF<sub>3</sub> (0.168% K<sup>–1</sup> at 300 K).</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S587 - S591"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. A. Shakirov, A. S. Nizamutdinov, A. A. Shavelev, S. Kh. Batygov, S. V. Kuznetsov, V. V. Semashko
{"title":"Photodynamic Processes in LiCaAlF6 Crystals with Double Activation by Ce3+ and Yb3+ Ions","authors":"A. A. Shakirov, A. S. Nizamutdinov, A. A. Shavelev, S. Kh. Batygov, S. V. Kuznetsov, V. V. Semashko","doi":"10.1134/S1062873824710420","DOIUrl":"10.1134/S1062873824710420","url":null,"abstract":"<p>We presented the results of a spectroscopic study of LiCaAlF<sub>6</sub> (LiCAF) samples doped with Ce<sup>3+</sup> and Yb<sup>3+</sup> ions. Change in the valence of the Yb<sup>3+</sup> → Yb<sup>2+</sup> ions were detected upon excitation resonant to Ce<sup>3+</sup> absorption. Luminescence of Ce<sup>3+</sup> and Yb<sup>2+</sup> ions was observed at the wavelengths of 280–320 nm and 380 nm, respectively. We associate the appearance of divalent ytterbium with photoionization of Ce<sup>3+</sup> ions and subsequent capture of a free charge carriers by Yb<sup>3+</sup> ions. Based on the temperature dependence of the lifetimes of excited Yb<sup>2+</sup>, we conclude that energy transfer to the Yb<sup>3+</sup> ion occurs due to the charge exchange processes of Yb<sup>2+</sup> ions. However, we also see additional quenching of Yb<sup>2+</sup> luminescence when the temperature is raised to room temperature.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S609 - S614"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. P. Savkin, D. A. Sorokin, D. V. Beloplotov, A. G. Nikolaev, M. V. Shandrikov, A. V. Nikonenko, K. A. Shcheglov
{"title":"Glow Discharge at Atmospheric Pressure: Radiation, Thermal Erosion, Nanoparticles","authors":"K. P. Savkin, D. A. Sorokin, D. V. Beloplotov, A. G. Nikolaev, M. V. Shandrikov, A. V. Nikonenko, K. A. Shcheglov","doi":"10.1134/S1062873824710596","DOIUrl":"10.1134/S1062873824710596","url":null,"abstract":"<p>The results of studies of a glow discharge in an argon flow at atmospheric pressure, initiated by voltage pulses with a duration of several microseconds with a frequency of 100 kHz are presented. The discharge current value varied from several tens of milliamperes to ∼1 A. The conditions when ions and atoms of cathode metal insert appeared in discharge plasma were determined. It has been shown as a result of metal atoms cooling, they stick together into nano-sized particles, which form agglomerates with characteristic dimensions from several micrometers to tens of micrometers and exposure of metal particles at atmospheric pressure leads to the formation of metal oxide powders. The prospects for using a plasma generator based on the glow discharge at atmospheric pressure as a source of ultrafine metal oxide powders have been determined.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S553 - S559"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. A. Sergeev, E. E. Popov, M. V. Gavrish, P. K. Rozanov, A. A. Shavelev, A. V. Astrakhantseva, A. S. Nizamutdinov, A. P. Pogoda
{"title":"Some Features of Electro-Optical Q-Modulation of a Lamp-Pumped Cr:LiSAF Laser","authors":"A. A. Sergeev, E. E. Popov, M. V. Gavrish, P. K. Rozanov, A. A. Shavelev, A. V. Astrakhantseva, A. S. Nizamutdinov, A. P. Pogoda","doi":"10.1134/S1062873824710407","DOIUrl":"10.1134/S1062873824710407","url":null,"abstract":"<p>A scheme of a high-power Cr:LiSAF laser operating in active Q-switching mode with a Pockels cell is developed. A method for shortening the laser pulse duration and increasing the peak power by means of intracavity transverse mode selection using an aperture diaphragm and external feedback with Bragg grating is proposed. As a result, the duration of the laser pulse was 19 ns and the pulse energy of 7.7 mJ, which corresponds to 0.41 MW of peak power at the central wavelength of 830 nm. The laser wavelength tuning was also adjusted in the range of 825–865 nm with a width of 2 nm. The results of the research obtained in this work will serve as a basis for the development of new systems for spectrometry for environmental monitoring of the atmosphere using the differential optical absorption spectroscopy method.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S615 - S619"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Combustion Regimes of Low Stretched Premixed Methane–Hydrogen–Air Mixtures near Flammability Limits","authors":"A. S. Demin, S. N. Mokrin","doi":"10.1134/S106287382471050X","DOIUrl":"10.1134/S106287382471050X","url":null,"abstract":"<p>The experimental study of counterflow premixed low-stretched flames stabilized in a flat channel is described in the paper. A premixed methane-air mixture was investigated. The effect of the channel gap on the flammability limits was evaluated. It was found that increasing the channel gap expands the flammable region to a lean mixture area. The effect of the hydrogen addition on the flammability limits was also studied as part of the paper. This leads to lower Lewis numbers and various unstable combustion modes such as running waves, moving cells and sporadic flames. Similar modes have been observed previously in microgravity experiments. The obtained combustion modes were classified, and the area of premixed methane-hydrogen-air flames existence was determined. Additionally, the regime diagram for the mixture with hydrogen content of 50% by volume in the fuel was plotted as a results of this study.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S489 - S494"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. M. Zubareva, A. A. Shakirov, T. M. Minnebaev, E. I. Oleinikova, A. G. Nikolaev, A. G. Kiiamov, A. S. Nizamutdinov
{"title":"Anti-Stokes Luminescence in BaY2F8 Crystals with Coactivation by Tb3+ and Yb3+ Ions","authors":"A. M. Zubareva, A. A. Shakirov, T. M. Minnebaev, E. I. Oleinikova, A. G. Nikolaev, A. G. Kiiamov, A. S. Nizamutdinov","doi":"10.1134/S1062873824710468","DOIUrl":"10.1134/S1062873824710468","url":null,"abstract":"<p>Spectral-kinetic characteristics of BaY<sub>2</sub>F<sub>8</sub>:Tb<sup>3+</sup>–Yb<sup>3+</sup> in anti-Stokes luminescence processes with excitation at a wavelength of 980 nm were studied. Luminescence occurs up to UV range at transitions <sup>5</sup><i>D</i><sub>3</sub> → <sup>7</sup><i>F</i><sub><i>j</i></sub> (<i>j</i> = 4, 5, 6) due to energy transfer processes from ytterbium ions to terbium ions and multiphoton excitation. The power index of the dependence of the luminescence intensity on the power of the pulse excitation was measured, which is equal to 2.27 and 2 for the <sup>5</sup><i>D</i><sub>4</sub> and <sup>5</sup><i>D</i><sub>3</sub> levels, respectively. The quantum yield of anti-Stokes luminescence of crystals with coactivation by Tb<sup>3+</sup>–Yb<sup>3+</sup> ions was measured, which is equal to 0.004, 0.03 and 0.014% for, respectively, 2, 5 and 10 at % concentration of ytterbium ions.</p>","PeriodicalId":504,"journal":{"name":"Bulletin of the Russian Academy of Sciences: Physics","volume":"88 4 supplement","pages":"S638 - S645"},"PeriodicalIF":0.48,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143638466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}