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Chumakova NA, Popov DS, Kaplin AV, Rebrikova AT, Eremina EA, Korobov MV, Khrykina ON. Phase transformation in the "Brodie graphite oxide-acetonitrile" system - influence of the oxidizing level of the material. Phys Chem Chem Phys 2023; 25:9648-9655. [PMID: 36943208 DOI: 10.1039/d3cp00426k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Reversible phase transformation in the Brodie graphite oxide-acetonitrile system, which is intercalation or release of part of the sorbed liquid from the interplanar space accompanied by an increase or a decrease in interplanar distances, is commonly observed in twice-oxidized materials. We observed this phenomenon for once-, twice- and thrice-oxidized materials using the EPR spin probe technique, DSC, and temperature programmed XRD. It was shown that all materials under study formed similar low temperature (LT) and high temperature (HT) swollen structures with acetonitrile. The phase transformation of these structures is observed for materials with different oxidation levels in the same temperature range (∼20 K). The twice- and thrice-oxidized Brodie graphite oxides form swollen structures with the same parameters, while the once-oxidized material sorbs less acetonitrile at lower temperatures, but shows the same interplanar distances as those in twice- and thrice-oxidized materials. The spin probe technique has proven its sensitivity to the appearance of small amounts of the new forming swollen structures, which makes this method useful in studies of phase transformations.
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Affiliation(s)
- N A Chumakova
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Kosygin St. 4, Moscow, 119991, Russia.
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - D S Popov
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - A V Kaplin
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Kosygin St. 4, Moscow, 119991, Russia.
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - A T Rebrikova
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - E A Eremina
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - M V Korobov
- M.V. Lomonosov Moscow State University, Chemistry Department, Leninskiye Gory, 1/3, Moscow, 119991, Russia
| | - O N Khrykina
- Shubnikov Institute of Crystallography, Federal Scientific Research Centre 'Crystallography and Photonics' of Russian Academy of Sciences, 59 Leninskiy prospect, Moscow, 119333, Russia
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Kaplin AV, Rebrikova AT, Eremina EA, Chumakova NA, Avramenko NV, Korobov MV. Sorption of Polar Sorbents into GO Powders and Membranes. Membranes (Basel) 2023; 13:53. [PMID: 36676860 PMCID: PMC9862977 DOI: 10.3390/membranes13010053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 12/26/2022] [Accepted: 12/29/2022] [Indexed: 06/17/2023]
Abstract
The comparative study of sorption of polar substances acetonitrile and water into powders and membranes (>10 μm thick) of modified Hummers (HGO) and Brodie (BGO) graphite oxides was performed using isopiestic method (IM) and differential scanning calorimetry (DSC). Additional sorption data were obtained for pyridine and 1-octanol. Sorption measurements were accompanied by conventional XRD and XPS control. Electron paramagnetic resonance (EPR) was additionally used to characterize ordering of the membranes. The impact on sorption of synthetic procedure (Brodie or Hummers), method of making membranes, chemical nature of the sorbent, and method of sorption was systematically examined. It was demonstrated that variations in synthetic procedures within both Hummers and Brodie methods did not lead to changes in the sorption properties of the corresponding powders. Sorption of acetonitrile and pyridine was reduced by approximately half when switching from powders to membranes at ambient temperature. DSC measurements at a lower temperature gave equal sorption of acetonitrile into HGO powder and membranes. Water has demonstrated unique sorption properties. Equal sorption of water was measured for HGO membranes and powders at T = 298 K and at T = 273 K. It was demonstrated that lowering the orientational alignment of the membranes led to the increase of sorption. In practice this could allow one to tune sorption/swelling and transport properties of the GO membranes directly by adjusting their internal ordering without the use of any composite materials.
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Affiliation(s)
- A. V. Kaplin
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1/3, Moscow 119991, Russia
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Kosygin St. 4, Moscow 119991, Russia
| | - A. T. Rebrikova
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1/3, Moscow 119991, Russia
| | - E. A. Eremina
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1/3, Moscow 119991, Russia
| | - N. A. Chumakova
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1/3, Moscow 119991, Russia
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Science, Kosygin St. 4, Moscow 119991, Russia
| | - N. V. Avramenko
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1/3, Moscow 119991, Russia
| | - M. V. Korobov
- Chemistry Department, M.V. Lomonosov Moscow State University, Leninskiye Gory, 1/3, Moscow 119991, Russia
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Usoltseva LO, Volkov DS, Nedosekin DA, Korobov MV, Proskurnin MA, Zharov VP. Absorption spectra of nanodiamond aqueous dispersions by optical absorption and optoacoustic spectroscopies. Photoacoustics 2018; 12:55-66. [PMID: 30450280 PMCID: PMC6222039 DOI: 10.1016/j.pacs.2018.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 10/07/2018] [Accepted: 10/23/2018] [Indexed: 06/09/2023]
Abstract
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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Affiliation(s)
- L O Usoltseva
- Chemistry Department, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - D S Volkov
- Chemistry Department, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - D A Nedosekin
- Philips Classic Laser Laboratories, University of Arkansas for Medical Sciences, Little Rock, Arkansas, 72205, USA
| | - M V Korobov
- Chemistry Department, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - M A Proskurnin
- Chemistry Department, Lomonosov Moscow State University, Moscow, 119991, Russia
| | - V P Zharov
- Philips Classic Laser Laboratories, University of Arkansas for Medical Sciences, Little Rock, Arkansas, 72205, USA
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Mikheev IV, Kareev IE, Bubnov VP, Volkov DS, Korobov MV, Proskurnin MA. Development of Standard Reference Samples of Aqueous Fullerene Dispersions. J Anal Chem 2018. [DOI: 10.1134/s106193481809006x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Vladimirova ON, Bashkireva AS, Korobov MV, Khorkova OV, Lomonosova OV. [Disability as a medical and social indicator of health status and aging among Russian Population]. Adv Gerontol 2017; 30:398-402. [PMID: 28849885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
According to the State Statistics a comparative analysis of total disability in the Russian Federation in 2010-2016 years was conducted, taking into account the performance of the working-age and over working-age population. The necessity of integration policy towards the older generation and social policy in respect of disabled persons is shown: it is advisable to make adjustments to the national strategies and programs involving the duties of authorities to protect and promote the rights of disabled people, the development of preventive, rehabilitation, medical and social trends in the interests of senior citizens are involved.
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Affiliation(s)
- O N Vladimirova
- Saint-Petersburg Postgraduate Institute of Medical experts, 11/12, B. Samsonievsky pr., St. Petersburg, 194044, Russian Federation
| | - A S Bashkireva
- Health Committee of the Leningrad Region, 113, Nevsky pr., St. Petersburg, 191030, Russian Federation;
- Leningrad Regional Hospital, 45-49, Lunacharskogo pr., St. Petersburg, 194291, Russian Federation
| | - M V Korobov
- Saint-Petersburg Postgraduate Institute of Medical experts, 11/12, B. Samsonievsky pr., St. Petersburg, 194044, Russian Federation
| | - O V Khorkova
- Saint-Petersburg Postgraduate Institute of Medical experts, 11/12, B. Samsonievsky pr., St. Petersburg, 194044, Russian Federation
| | - O V Lomonosova
- Main bureau of medical and social expertise in Saint-Petersburg, 58-А, Liteiniy pr., St. Petersburg, 191014, Russian Federation
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Vladimirova ON, Bashkireva AS, Korobov MV, Lomonosova OV, Khorkova OV. [Socio-medical aspects of primary disability among those of working and over working age in Russian Federation]. Adv Gerontol 2017; 30:498-504. [PMID: 28968023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
According to the State Statistics a the indicators of primary disability in 2003-2015 years in Russia were studied, taking into account the population in working and over working age first time recognized as disabled persons. The necessity of medical organizations improvement during the medical and social expertise of patients in different ages was shown. The characteristics of social and medical features of the primary disability were presented that should be taken into consideration in the development of social protection programs, rehabilitation of disabled people and disability prevention, especially among elderly citizens.
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Affiliation(s)
- O N Vladimirova
- Saint-Petersburg Postgraduate Institute of Medical experts, 11/12, B. Samsonievsky pr., St. Petersburg, 194044, Russian Federation
| | - A S Bashkireva
- Committee for Social Protection of the Population of the Leningrad Region, 6, Zamshina str., St. Petersburg, 195197, Russian Federation;
- The Gerontological Center of the Leningrad Region, Glazhevo, Kirishi district, Leningrad Region, 187126, Russian Federation
| | - M V Korobov
- Saint-Petersburg Postgraduate Institute of Medical experts, 11/12, B. Samsonievsky pr., St. Petersburg, 194044, Russian Federation
| | - O V Lomonosova
- Main bureau of medical and social expertise in Saint-Petersburg, 58-А, Liteiniy pr., St. Petersburg, 191014, Russian Federation
| | - O V Khorkova
- Saint-Petersburg Postgraduate Institute of Medical experts, 11/12, B. Samsonievsky pr., St. Petersburg, 194044, Russian Federation
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Prokudina ES, Maslov LN, Bushov YV, Korobov MV, Podolskii AA, Wang S, Lishmanov YB. [INVOLVEMENT OF 5-OPIOID RECEPTORS IN THE INCREASED RESISTANCE OF HEART AND MITOCHONDRIA TO IMPACT OF ISCHEMIA-REPERFUSION AFTER ADAPTATION TO CHRONIC CONTINUOUS HYPOXIA]. Ross Fiziol Zh Im I M Sechenova 2016; 102:1195-1205. [PMID: 30193437] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
It was investigated the involvement of cardiac Ϭ-opioid receptors (OR) in increasing the resistance of the heart and myocardial mitochondria to ischemia-reperfusion after adaptation rats to chronic continuous normobaric hypoxia (CCNH). Rats were subjected to CCNH for 21 days at 12 % O2. It was evoked global ischemia (45 minutes) and reperfusion (30 minutes) of the isolated perfused heart. Adaptation to CCNH promoted a reduction of creatine kinase release from necrotic cardiomyocytes during reperfusion and improved reperfusion recovery of heart contractility. Mitochondrial respiratory and state of MPT pore were more resistant to ischemia-reperfusion in adapting rats. Perfusion of isolated hearts with TIPP(0) (30 nM/l, a selective Ϭ-OR-antagonist) or naltriben (1 nM/l, a selective 52-OR-antagonist) completely eliminated the cardioprotective effect of CCNH. BNTX (1 nM/l, a selective Ϭ-OR-antagonist) had no effect on the cardioprotective effect of CCNH. This data suggest that cardiac 52-OR involved in the increased resistance of the heart and mitochondria to ischemia-reperfusion after adaptation rats to CCNH.
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Korobov MV, Katiukhin VN, Shvartsman ZD, Pomnikov VG. [The International Classification of Functioning, Disability, and Health in the practice of a sociomedical examination service for internal diseases]. TERAPEVT ARKH 2013; 85:43-46. [PMID: 23808291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The paper gives the International Classification of Functioning, Disability, and Health (ICF), interactions between health changes, the personality and social factors of an individual with therapeutic diseases to define disability criteria and a scientific rationale for the necessity and scope of rehabilitative measures through public health and social protection organizations.
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Volkov DS, Semenyuk PI, Korobov MV, Proskurnin MA. Quantification of nanodiamonds in aqueous solutions by spectrophotometry and thermal lens spectrometry. J Anal Chem 2012. [DOI: 10.1134/s1061934812100115] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Aksenov VL, Avdeev MV, Kyzyma EA, Rosta L, Korobov MV. Effect of the age of the C60/N-methyl-2-pyrrolidone solution on the structure of clusters in the C60/N-methyl-2-pyrrolidone/water system according to the small-angle neutron scattering data. CRYSTALLOGR REP+ 2007. [DOI: 10.1134/s106377450703025x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bogachev AG, Korobov MV, Senyavin VM, Markin AV, Davydov VA, Rakhmanina AV. The phase diagram of fullerene C60 at high temperatures and pressures. Russ J Phys Chem 2006. [DOI: 10.1134/s0036024406050050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Brekhov EI, Kalinnikov VV, Korobov MV. [Cysts of the bile ducts]. Khirurgiia (Mosk) 2006:67-71. [PMID: 17167914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
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Avdeev MV, Khokhryakov AA, Tropin TV, Andrievsky GV, Klochkov VK, Derevyanchenko LI, Rosta L, Garamus VM, Priezzhev VB, Korobov MV, Aksenov VL. Structural features of molecular-colloidal solutions of C60 fullerenes in water by small-angle neutron scattering. Langmuir 2004; 20:4363-8. [PMID: 15969139 DOI: 10.1021/la0361969] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Highly stable and reproducible molecular-colloidal water solutions of C60 fullerenes (FWS) obtained by transferring fullerenes from an organic solution into an aqueous phase with the help of ultrasonic treatment are investigated by means of small-angle neutron scattering (SANS). A polydispersity in the size of detected particles up to 84 nm is revealed. These particles are slightly anisotropic and have a characteristic size of approximately 70 nm. Along with it, there are some indications that a significant part of fullerenes composes particles with the size of the order of 1 nm. The contrast variation based on mixtures of light and heavy water shows that the mean scattering length density of the particles is close to that of the packed fullerene associates as well as that the characteristic size of possible fluctuations of the scattering length density within the particles does not exceed 2 nm. A smooth surface resulting in the Porod law for the scattering is detected. A number of models discussed in the literature are considered with respect to the SANS data.
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Affiliation(s)
- M V Avdeev
- Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia
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Ermilova LK, Smirnova NZ, Korobov MV. [Occupational rehabilitation after surgical treatment of laryngeal cancer]. Zh Ushn Nos Gorl Bolezn 1979:43-8. [PMID: 452690] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Ermilova LK, Korobov MV. [Functional possibilities of the central nervous system in patients and invalids after surgery for laryngeal cancer]. Zh Ushn Nos Gorl Bolezn 1979:13-6. [PMID: 442803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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