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Matveev AV, Nartova AV, Sankova NN, Okunev AG. DLgram cloud service for deep-learning analysis of microscopy images. Microsc Res Tech 2024; 87:991-998. [PMID: 38186233 DOI: 10.1002/jemt.24480] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 12/12/2023] [Indexed: 01/09/2024]
Abstract
To analyze images in various fields of science and technology, it is often necessary to count observed objects and determine their parameters. This can be quite labor-intensive and time-consuming. This article presents DLgram, a universal, user-friendly cloud service that is developed for this purpose. It is based on deep learning technologies and does not require programming skills. The user labels several objects in the image and uploads it to the cloud where the neural network is trained to recognize the objects being studied. The user receives recognition results, which if necessary, can be corrected, errors removed, or missing objects added. In addition, it is possible to carry out mathematical processing of the data obtained to get information about the sizes, areas, and coordinates of the observed objects. The article describes the service features and discusses examples of its application. The DLgram service allows to reduce significantly the time spent on quantitative image analysis, reduce subjective factor influence, and increase the accuracy of analysis. RESEARCH HIGHLIGHTS: DLgram automatically recognizes and counts the number of objects in images and their parameters. DLgram is a universal service, which was created on the basis of the latest deep learning developments and does not require programming skills.
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Affiliation(s)
- Andrey V Matveev
- Institute of Intellectual Robototechnics, Novosibirsk State University, Novosibirsk, Russia
| | - Anna V Nartova
- Institute of Intellectual Robototechnics, Novosibirsk State University, Novosibirsk, Russia
- Department of Physico-Chemical Research Methods, Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
| | - Natalya N Sankova
- Institute of Intellectual Robototechnics, Novosibirsk State University, Novosibirsk, Russia
- Department of Non-Traditional Catalytic Processes, Boreskov Institute of Catalysis SB RAS, Novosibirsk, Russia
| | - Alexey G Okunev
- Institute of Intellectual Robototechnics, Novosibirsk State University, Novosibirsk, Russia
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Nartova AV, Kvon RI, Kovtunova LM, Skovpin IV, Koptyug IV, Bukhtiyarov VI. XPS and HR TEM Elucidation of the Diversity of Titania-Supported Single-Site Ir Catalyst Performance in Spin-Selective Propene Hydrogenation. Int J Mol Sci 2023; 24:15643. [PMID: 37958626 PMCID: PMC10650017 DOI: 10.3390/ijms242115643] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Revised: 10/19/2023] [Accepted: 10/24/2023] [Indexed: 11/15/2023] Open
Abstract
Immobilized [Ir(COD)Cl]2-Linker/TiO2 catalysts with linkers containing Py, P(Ph)2 and N(CH3)2 functional groups were prepared. The catalysts were tested via propene hydrogenation with parahydrogen in a temperature range from 40 °C to 120 °C which was monitored via NMR. The catalytic behavior of [Ir(COD)Cl]2-Linker/TiO2 is explained on the basis of quantitative and qualitative XPS data analysis performed for the catalysts before and after the reaction at 120 °C. It is shown that the temperature dependence of propene conversion and the enhancement of the NMR signal are explained via a combination of the stabilities of both the linker and immobilized [Ir(COD)Cl]2 complex. It is demonstrated that the N(CH3)2-linker is the most stable at the surface of TiO2 under used reaction conditions. As a result, only this sample shows a rise in the enhancement of the NMR signal in the 100-120 °C temperature range.
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Affiliation(s)
- Anna V. Nartova
- Department of Physical-Chemical Methods of Investigation, Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090 Novosibirsk, Russia; (R.I.K.); (V.I.B.)
| | - Ren I. Kvon
- Department of Physical-Chemical Methods of Investigation, Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090 Novosibirsk, Russia; (R.I.K.); (V.I.B.)
| | - Larisa M. Kovtunova
- Department of Physical-Chemical Methods of Investigation, Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090 Novosibirsk, Russia; (R.I.K.); (V.I.B.)
| | - Ivan V. Skovpin
- Laboratory of Magnetic Resonance Microimaging, International Tomography Center SB RAS, Institutskaya St. 3A, 630090 Novosibirsk, Russia (I.V.K.)
| | - Igor V. Koptyug
- Laboratory of Magnetic Resonance Microimaging, International Tomography Center SB RAS, Institutskaya St. 3A, 630090 Novosibirsk, Russia (I.V.K.)
| | - Valerii I. Bukhtiyarov
- Department of Physical-Chemical Methods of Investigation, Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, 630090 Novosibirsk, Russia; (R.I.K.); (V.I.B.)
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Ozerova AM, Potylitsyna AR, Bauman YI, Tayban ES, Lipatnikova IL, Nartova AV, Vedyagin AA, Mishakov IV, Shubin YV, Netskina OV. Synthesis of Chlorine- and Nitrogen-Containing Carbon Nanofibers for Water Purification from Chloroaromatic Compounds. Materials (Basel) 2022; 15:8414. [PMID: 36499909 PMCID: PMC9741473 DOI: 10.3390/ma15238414] [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: 11/07/2022] [Revised: 11/19/2022] [Accepted: 11/22/2022] [Indexed: 06/17/2023]
Abstract
Chlorine- and nitrogen-containing carbon nanofibers (CNFs) were obtained by combined catalytic pyrolysis of trichloroethylene (C2HCl3) and acetonitrile (CH3CN). Their efficiency in the adsorption of 1,2-dichlorobenzene (1,2-DCB) from water has been studied. The synthesis of CNFs was carried out over self-dispersing nickel catalyst at 600 °C. The produced CNFs possess a well-defined segmented structure, high specific surface area (~300 m2/g) and high porosity (0.5-0.7 cm3/g). The addition of CH3CN into the reaction mixture allows the introduction of nitrogen into the CNF structure and increases the volume of mesopores. As a result, the capacity of CNF towards adsorption of 1,2-DCB from its aqueous solution increased from 0.41 to 0.57 cm3/g. Regardless of the presence of N, the CNF samples exhibited a degree of 1,2-DCB adsorption from water-organic emulsion exceeding 90%. The adsorption process was shown to be well described by the Dubinin-Astakhov equation. The regeneration of the used CNF adsorbent through liquid-phase hydrodechlorination was also investigated. For this purpose, Pd nanoparticles (1.5 wt%) were deposited on the CNF surface to form the adsorbent with catalytic function. The presence of palladium was found to have a slight effect on the adsorption capacity of CNF. Further regeneration of the adsorbent-catalyst via hydrodechlorination of adsorbed 1,2-DCB was completed within 1 h with 100% conversion. The repeated use of regenerated adsorbent-catalysts for purification of solutions after the first cycle of adsorption ensures almost complete removal of 1,2-DCB.
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Affiliation(s)
- Anna M. Ozerova
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Arina R. Potylitsyna
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
| | - Yury I. Bauman
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Elena S. Tayban
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Inna L. Lipatnikova
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Anna V. Nartova
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Aleksey A. Vedyagin
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Ilya V. Mishakov
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
| | - Yury V. Shubin
- Nikolaev Institute of Inorganic Chemistry SB RAS, Lavrentieva Av. 3, 630090 Novosibirsk, Russia
| | - Olga V. Netskina
- Boreskov Institute of Catalysis SB RAS, Lavrentieva Av. 5, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
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Maksimova TA, Mishakov IV, Bauman YI, Ayupov AB, Mel’gunov MS, Dmitrachkov AM, Nartova AV, Stoyanovskii VO, Vedyagin AA. Effect of Pretreatment with Acids on the N-Functionalization of Carbon Nanofibers Using Melamine. Materials (Basel) 2022; 15:ma15228239. [PMID: 36431724 PMCID: PMC9693401 DOI: 10.3390/ma15228239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 11/11/2022] [Accepted: 11/17/2022] [Indexed: 05/30/2023]
Abstract
Nowadays, N-functionalized carbon nanomaterials attract a growing interest. The use of melamine as a functionalizing agent looks prospective from environmental and cost points of view. Moreover, the melamine molecule contains a high amount of nitrogen with an atomic ratio C/N of 1/2. In present work, the initial carbon nanofibers (CNFs) were synthesized via catalytic pyrolysis of ethylene over microdispersed Ni-Cu alloy. The CNF materials were pretreated with 12% hydrochloric acid or with a mixture of concentrated nitric and sulfuric acids, which allowed etching of the metals from the fibers and oxidizing of the fibers' surface. Finally, the CNFs were N-functionalized via their impregnation with a melamine solution and thermolysis in an inert atmosphere. According to the microscopic data, the initial structure of the CNFs remained the same after the pretreatment and post-functionalization procedures. At the same time, the surface of the N-functionalized CNFs became more defective. The textural properties of the materials were also affected. In the case of the oxidative treatment with a mixture of acids, the highest content of the surface oxygen of 11.8% was registered by X-ray photoelectron spectroscopy. The amount of nitrogen introduced during the post-functionalization of CNFs with melamine increased from 1.4 to 4.3%. Along with this, the surface oxygen concentration diminished to 6.4%.
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Affiliation(s)
| | | | - Yury I. Bauman
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
| | - Artem B. Ayupov
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
| | - Maksim S. Mel’gunov
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
| | - Aleksey M. Dmitrachkov
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
| | - Anna V. Nartova
- Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 2, 630090 Novosibirsk, Russia
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Vorms EA, Suprun EA, Nartova AV, Kvon RI, Oshchepkov AG. Electrodeposited NiCu nanoparticles for the borohydride oxidation reaction: Effect of Cu on the activity and stability of Ni upon surface oxidation. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2022.141196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Skovpin IV, Kovtunova LM, Nartova AV, Kvon RI, Bukhtiyarov VI, Koptyug IV. Anchored complexes of rhodium and iridium for the hydrogenation of alkynes and olefins with parahydrogen. Catal Sci Technol 2022. [DOI: 10.1039/d1cy02258j] [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: 11/21/2022]
Abstract
Iridium and rhodium complexes anchored on silica gel surface via NH2–(CH2)3– and P(Ph)2–(CH2)2– linker groups achieve high (∼9%) efficiency in pairwise addition of parahydrogen to unsaturated gaseous substrates in heterogeneous hydrogenation processes.
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Affiliation(s)
- Ivan V. Skovpin
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
| | - Larisa M. Kovtunova
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
- Boreskov Institute of Catalysis, SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk 630090, Russia
| | - Anna V. Nartova
- Boreskov Institute of Catalysis, SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk 630090, Russia
| | - Ren I. Kvon
- Boreskov Institute of Catalysis, SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk 630090, Russia
| | - Valerii I. Bukhtiyarov
- Boreskov Institute of Catalysis, SB RAS, 5 Acad. Lavrentiev Pr., Novosibirsk 630090, Russia
| | - Igor V. Koptyug
- International Tomography Center, SB RAS, 3A Institutskaya St., Novosibirsk 630090, Russia
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Eßer E, Schröder D, Nartova AV, Dmitrachkov AM, Kureti S. Reduction of NOx by H2 on WOx-Promoted Pt/Al2O3/SiO2 Catalysts Under O2-Rich Conditions. Catal Letters 2021. [DOI: 10.1007/s10562-021-03747-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
AbstractThis work addresses the reduction of NOx by H2 under O2-rich conditions using Al2O3/SiO2-supported Pt catalysts with different loads of WOx promotor. The samples were thoroughly characterised by N2 physisorption, temperature-programmed desorption of CO, scanning electron microscopy, X-ray diffraction, laser raman spectroscopy, X-ray photoelectron spectroscopy and diffuse reflectance infrared fourier transform spectroscopy with probe molecule CO. The catalytic studies of the samples without WOx showed pronounced NOx conversion below 200 °C, whereas highest efficiency was related to small Pt particles. The introduction of WOx provided increasing deNOx activity as well as N2 selectivity. This promoting effect was referred to an additional reaction path at the Pt-WOx/Al2O3/SiO2 interface, whereas an electronic activation of Pt by strong metal support interaction was excluded.
Graphic Abstract
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Nartova AV, Kovtunova LM, Larichev YV, Khudorozhkov AK, Bobrovskaya AN, Shterk GV, Bukhtiyarov VI. Influence of a precursor solution on the characteristics of platinum on alumina catalysts. Mendeleev Communications 2017. [DOI: 10.1016/j.mencom.2017.01.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Larichev YV, Nartova AV, Martyanov ON. The influence of different organic solvents on the size and shape of asphaltene aggregates studied via small-angle X-ray scattering and scanning tunneling microscopy. ADSORPT SCI TECHNOL 2016. [DOI: 10.1177/0263617415623440] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Yu V Larichev
- Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, Russia; Novosibirsk State University, Russia
| | - AV Nartova
- Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, Russia; Novosibirsk State University, Russia
| | - ON Martyanov
- Boreskov Institute of Catalysis, Siberian Branch of Russian Academy of Sciences, Russia; Novosibirsk State University, Russia
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Nartova AV, Larichev YV, Kovtunova LM, Khudorozhkov AK, Bukhtiyarov VI. Formation of active component particles in platinum catalysts on α-and γ-alumina. Mendeleev Communications 2015. [DOI: 10.1016/j.mencom.2015.11.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Semikolenov SV, Nartova AV, Voronchikhin VD, Dubkov KA. New type of liquid rubber and compositions based on it. Environ Sci Pollut Res Int 2014; 21:12163-12169. [PMID: 24801289 DOI: 10.1007/s11356-014-2954-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Accepted: 04/21/2014] [Indexed: 06/03/2023]
Abstract
The new method for producing the functionalized polymers and oligomers containing carbonyl C=O groups is developed. The method is based on the noncatalytic oxidation of unsaturated rubbers by nitrous oxide (N2O) at 180-230 °С. The proposed method allows obtaining the new type of functionalized rubbers-liquid unsaturated polyketones with regulated molecular weight and concentration of C=O groups. The influence of the liquid polyketone addition on properties of rubber-based composites is investigated. The study indicates good prospects of using the liquid polyketones for the improvement of properties and operating characteristics of the various types of rubbers and the rubber-cord systems.
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Gharachorlou A, Detwiler MD, Nartova AV, Lei Y, Lu J, Elam JW, Delgass WN, Ribeiro FH, Zemlyanov DY. Palladium nanoparticle formation on TiO₂(110) by thermal decomposition of palladium(II) hexafluoroacetylacetonate. ACS Appl Mater Interfaces 2014; 6:14702-11. [PMID: 25093626 DOI: 10.1021/am504127k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Palladium nanoparticles were synthesized by thermal decomposition of palladium(II) hexafluoroacetylacetonate (Pd(hfac)2), an atomic layer deposition (ALD) precursor, on a TiO2(110) surface. According to X-ray photoelectron spectroscopy (XPS), Pd(hfac)2 adsorbs on TiO2(110) dissociatively yielding Pd(hfac)(ads), hfac(ads), and adsorbed fragments of the hfac ligand at 300 K. A (2 × 1) surface overlayer was observed by scanning tunneling microscopy (STM), indicating that hfac adsorbs in a bidentate bridging fashion across two Ti 5-fold atoms and Pd(hfac) adsorbs between two bridging oxygen atoms on the surface. Annealing of the Pd(hfac)(ads) and hfac(ads) species at 525 K decomposed the adsorbed hfac ligands, leaving PdO-like species and/or Pd atoms or clusters. Above 575 K, the XPS Pd 3d peaks shift toward lower binding energies and Pd nanoparticles are observed by STM. These observations point to the sintering of Pd atoms and clusters to Pd nanoparticles. The average height of the Pd nanoparticles was 1.2 ± 0.6 nm at 575 K and increased to 1.7 ± 0.5 nm following annealing at 875 K. The Pd coverage was estimated from XPS and STM data to be 0.05 and 0.03 monolayers (ML), respectively, after the first adsorption/decomposition cycle. The amount of palladium deposited on the TiO2(110) surface increased linearly with the number of adsorption/decomposition cycles with a growth rate of 0.05 ML or 0.6 Å per cycle. We suggest that the removal of the hfac ligand and fragments eliminates the nucleation inhibition of Pd nanoparticles previously observed for the Pd(hfac)2 precursor on TiO2.
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Affiliation(s)
- Amir Gharachorlou
- School of Chemical Engineering, Purdue University , West Lafayette, Indiana 47907, United States
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