Javlon

@samdu.uz

Institute of Biochemistry, Department of Physical and Colloidal Chemistry
Samarkand State universty

Javlon


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https://researchid.co/javlon1985
Uzokov Javlon Rustamboyevich. Born on September 16, 1984 in Ishtikhan district, Samarkand region. Uzbek by nationality, higher education

EDUCATION

I have a higher education, Doctor of Philosophy (PhD) in Chemistry.

RESEARCH, TEACHING, or OTHER INTERESTS

Physical and Theoretical Chemistry, Analytical Chemistry
11

Scopus Publications

119

Scholar Citations

6

Scholar h-index

5

Scholar i10-index

Scopus Publications

  • Quantum chemical investigation of the photocatalytic activity of TiO2nanoclusters with different structures
    Javlon Uzokov, Sevara Mamaziyayeva, Abduqodir Muxamadiev, Ilyos Ruziyev, Nurali Mukhamadiev
    Proceedings of SPIE the International Society for Optical Engineering, 2025
    The structural, electronic and photocatalytic activity of (TiO<sub>2</sub>)n (n =5;10;15;20) nanoclusters were studied by quantum chemical methods. According to the calculation results, the band gap in the n=5 cluster was calculated to be 4 eV and its wavelength was calculated to be 310 nm. The band gap energies in the n=10; 15; 20 clusters were calculated to be 3.61; 3.20; 2.90, respectively, and their wavelengths were calculated to be 344; 388 and 427 nm, respectively. Also, the values of the standard Gibbs energy (&Delta;G) and enthalpy (&Delta;H) become negative with increasing number of units, which indicates that the formation of large clusters is thermodynamically favorable. For example, the Gibbs free energy for (TiO<sub>2</sub>)<sub>5</sub> was found to decrease from -560.24 kcal/mol to -2250.95 kcal/mol for (TiO<sub>2</sub>)<sub>20</sub>. The entropy (S) and heat capacity at constant storage (𝐶𝑝) showed a systematic increase with cluster size, additional dispersity, and Gibbs tendency. The heat capacity increased from -567.49 to -2364.82 kcal/mol, and the entropy capacity increased from 80.56 to 265.76 kcal/mol. The rotational and configurational degrees of freedom were found to be improved.
  • Synthesis of magnetic nanomaterial CoFe2O4and study by spectral methods
    Gulzoda Fayzieva, Abdukodir Mukhamadiev, Nurali Mukhamadiev, Rizamat Begmatov, Raxima Tashmatova, Javlon Uzokov
    Proceedings of SPIE the International Society for Optical Engineering, 2025
  • Elemental composition, spectral characteristics, and quantum chemical insights into SRTIO3perovoskite
    Madina Hayitova, Mokhidil Baxranova, Javlon Uzokov, Abduqodir Muxamadiev, Nurali Mukhamadiev, Feruz Khakimov
    Proceedings of SPIE the International Society for Optical Engineering, 2025
    The sol-gel synthesized SrTiO<sub>3</sub> perovskite was investigated by EDS analysis, which confirmed that its chemical composition was in good agreement with the initial precursors, both qualitatively and quantitatively. UV-Vis absorption spectra revealed a sharp decrease in light intensity in the 250&divide;300 nm region, while the absorption in the visible range remained relatively weak. This optical behavior suggests that the material is well suited for photocatalytic applications and optoelectronic devices operating in the ultraviolet region. Furthermore, the structural and electronic properties studied by DFT calculations at the B3LYP/6-31G** (d, p) level showed a band gap energy of approximately 3.2 eV corresponding to a wavelength of 387 nm, confirming its semiconducting nature. Thermodynamic analysis by DFT showed that the Gibbs free energy of formation (-379.6 kcal mol<sup>-1</sup>) reflects the high stability of SrTiO<sub>3</sub> and its spontaneous formation from elemental components under ambient conditions. The relatively low standard molar entropy indicates limited configurational freedom, consistent with the ordered crystalline nature of this perovskite oxide.
  • Quantum chemical study of the photocatalytically active Mo-quercetin complex
    Javlon Uzokov, Sobir Kosimov, Abduqodir Muxamadiev, Aziz Voxidov, Nurali Mukhamadiev, Tohir Anvarov
    Proceedings of SPIE the International Society for Optical Engineering, 2025
    The electronic and structural nature of the photocatalytically active Mo-quercetin complex was investigated using quantum chemical methods. According to DFT calculations performed at the B3LYP/6-31G(d,p) level, the HOMO energy of the complex was found to be –5.81 eV, while the LUMO energy was –3.28 eV. The corresponding band gap was determined to be approximately 464 nm. Additionally, the reactive character of the molecule can be revealed by the electrostatic potential surface area analysis. It was estimated that 42% of the complex's surface area had ESP values less than -25 kcal/mol. This suggests that there are many nucleophilic areas available for interactions like conjugation with biomolecules, coordination with other metal centers, and hydrogen bonding. On the other hand, it was discovered that about 18% of the surface area exceeded +20 kcal/mol. These results indicate that the complex exhibits semiconducting behavior and can be effectively used as a photocatalyst in the visible light region. Moreover, under standard conditions, the Gibbs free energy (&Delta;G&deg;) of the complex was calculated to be –75.7 kJ/mol, and the standard enthalpy change (ΔH&deg;) was –114.2 kJ/mol, reflecting an exothermic interaction between the molybdenum center and the quercetin ligand. The standard entropy change (&Delta;S&deg;) was found to be –105.4 J/mol·K, indicating a decrease in disorder upon complex formation. These thermodynamic parameters confirm that the Mo-quercetin complex is thermodynamically stable. Structurally, the stability of the complex was further assessed based on its intermolecular interaction energies.
  • Quantum chemical study of the photocatalytic activity Fe3O4/SiO2-trimesic acid-melamine supramolecular system
    Javlon Uzokov, Gulzoda Fayziyeva, Nurali Mukhamadiev, Ilyos Ruziyev, Nafosat Kuliboyeva, Khurshid Saidov
    Proceedings of SPIE the International Society for Optical Engineering, 2025
    Quantum chemical calculations were performed to study the structural and electronic properties of the Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>-trimesic acid-melamine complex with photocatalytic activity. The surface characteristics of the complex were evaluated using the 3D Hirshfeld topographic map and the non-covalent interactions in it using the two-dimensional Hirschfeld fingerprint plot. According to it, it was calculated that the non-covalent interactions that increase the stability of the supramolecular system on the surface are H....O interactions, which account for 53,6%, and N....H interactions, which account for 39,3%. The energies of the HOMO and LUMO molecular orbitals of the Fe<sub>3</sub>O<sub>4</sub>/SiO<sub>2</sub>-trimesic acid-melamine supramolecular system were calculated. According to the calculation results, it was found that the HUMO orbital energy of the complex is <i>E</i> = -5,86 eV, and the LUMO orbital energy is <i>E</i> = -3,13 eV. Also, according to the calculation results based on the B3LYP/DZVP2 hybrid basis set in the TD-DFT method, the band gap energy of the complex was found to be &Delta;<i>E</i> = 2,73 eV. This indicates that it exhibits effective photocatalytic activity in the visible light region.
  • Synthesis of complexes from metal cations and 1,3,5-tris-(betta oxoethyl) hexahydroxo-s-triazine and evaluation of their photocatalytic properties
    Guzal Khodjayorova, Javlon Uzokov, Nurali Mukhamadiev, Raxima Tashmatova, Abduqodir Mukhamadiev, Asatullo Radjabov
    Proceedings of SPIE the International Society for Optical Engineering, 2025
    This study describes the synthesis of coordination complexes based on Zn<sup>2+</sup> and Cd<sup>2+</sup> metal cations using 1,3,5-tris(&beta;-hydroxyethyl)hexahydro-s-triazine as an organic ligand. The obtained compounds were characterized by IR spectroscopy, which revealed characteristic absorption bands corresponding to C=N stretching vibrations in the triazine ring, as well as peaks at 689.08 cm<sup>-1</sup> and 624.53 cm<sup>-1</sup> associated with Zn–O and Zn–N stretching vibrations, respectively. X-ray microanalysis confirmed that the elemental composition of the complexes corresponded to that of the starting reagents. Energy-dispersive X-ray spectroscopy (EDS) revealed distinct Zn-K&alpha; and high-energy Zn-K&beta; peaks around 8.6 keV, indicating the presence of metallic zinc. Quantum chemical calculations showed that the HOMO energy level of the Zn complex is –1.905 eV, the LUMO level is 5.707 eV, and the energy gap (&Delta;E) is 3.802 eV. The photocatalytic activity of the Zn–1,3,5-tris(&beta;-hydroxyethyl)hexahydro-s-triazine complex was evaluated by studying the photodegradation of methylene blue dye in wastewater under UV light irradiation. The results demonstrated that 76.14% of the dye was decomposed within 15 minutes, indicating a high photocatalytic efficiency of the synthesized complex.
  • Study of photocatalytic activity of ZnO synthesised by various methods
    Khilola Usmanova, Nigina Fazlieva, Abduqodir Muxamadiev, Javlon Uzokov, Nurali Mukhamadiev, Nigora Rustamova
    Proceedings of SPIE the International Society for Optical Engineering, 2025
    The document reveals the findings of the synthesis of nanostructured zinc oxide (ZnO) by various methods, including salt-gel, hydrothermal and “green” synthesis. The structure, morphology and optical properties of the minerals acquired, along with their capacity to catalyze reactions in the decomposition of organic contaminants, including methyl orange and methylene blue, are studied. It is shown that hydrothermal and “green” synthesis methods provide high surface area and steady activity ZnO nanostructures. Doping ZnO with nitrogen and carbon improved the spectral sensitivity of the material, allowing efficient decomposition of pollutants under the influence of sunlight. It can be seen that the highest decomposition rate measured with ZnO photocatalyst is rhodium B (<i>k</i> = 0.0279 min<sup>-1</sup>). Among the dyes, the decomposition rate index is the lowest for methyl yellow, as its decomposition rate constant was found to be <i>k</i> = 0.0144 min<sup>-1</sup>. The band gap energy of the zinc oxide nanocluster The calculation was performed utilizing the B3LYP (Lee-Yang-Parr) hybrid functional basis set in conjunction with the LANL2DZ basis set the electronic nature of the density functional theory (TD-DFT). It is known that the <sub>EHUMO-ELUMO</sub>, or the energy disparity in between HUMO and LUMO, offers band gap energy between them. For example, the energy of the valence band 194th frontier orbital (HUMO) in the (ZnO)<sub>10</sub> cluster was found to be E<sub>HUMO</sub> = -0.30389 Hatry energy units, and the energy of the conduction band 195 th frontier orbital (LUMO) was found to be E<sub>LUMO</sub> = -0.12819 Hatry energy units.
  • Zol-Gel Synthesis of Zno/Sio2 Nanocomposite Thin Films
    Khilola Usmonova, Javlon Uzokov, Nurali Mukhamadiev, Nigina Fazlieva
    Aip Conference Proceedings, 2024
  • Study of Complex Formation From S-Triazine Сu (Ii) Cation By Quantum Chemical Method
    Guzal Khodjayorova, Nurali Muxamadiyev, Javlon Uzokov, Raxima Tashmatova
    Aip Conference Proceedings, 2024
  • Synthesis and Texture Characteristics of Mesoporous Silica
    Gulbakhor Ulugboyeva, Javlon Uzokov, Nurali Mukhamadiev, Hamid Norboev
    Aip Conference Proceedings, 2024
  • Synthesis of Mesoporous Nanocomposite Sorbents and Their Texture Characteristics
    Javlon Uzokov, Abduqodir Mukhamadiyev, Nigina Fazliyeva, Ilyos Ruziyev, Nurali Mukhamadiyev
    Aip Conference Proceedings, 2024

RECENT SCHOLAR PUBLICATIONS

  • Quantum chemical study of the photocatalytically active Mo-quercetin complex
    J Uzokov, S Kosimov, A Muxamadiev, A Voxidov, N Mukhamadiev, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Elemental composition, spectral characteristics, and quantum chemical insights into SRTIO3 perovoskite
    M Hayitova, M Baxranova, J Uzokov, A Muxamadiev, N Mukhamadiev, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Quantum chemical study of the photocatalytic activity Fe3O4/SiO2-trimesic acid-melamine supramolecular system
    J Uzokov, G Fayziyeva, N Mukhamadiev, I Ruziyev, N Kuliboyeva, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Quantum chemical investigation of the photocatalytic activity of TiO2 nanoclusters with different structures
    J Uzokov, S Mamaziyayeva, A Muxamadiev, I Ruziyev, N Mukhamadiev
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Synthesis of magnetic nanomaterial CoFe2O4 and study by spectral methods
    G Fayzieva, A Mukhamadiev, N Mukhamadiev, R Begmatov, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Study of photocatalytic activity of ZnO synthesised by various methods
    K Usmanova, N Fazlieva, A Muxamadiev, J Uzokov, N Mukhamadiev, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Synthesis of complexes from metal cations and 1, 3, 5-tris-(betta oxoethyl) hexahydroxo-s-triazine and evaluation of their photocatalytic properties
    G Khodjayorova, J Uzokov, N Mukhamadiev, R Tashmatova, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • SEPARATION OF ORGANIC DYES FROM SOLUTIONS USING MODIFIED ACTIVATED CARBON
    D Ergasheva, A Mukhamadiyev, N Mukhamadiyev, J Uzokov
    Issue 3 of 2025 (151/2) 3 (174), 5-10 , 2025
    2025
  • REMOVAL OF HEAVY METAL CATIONS USING MESOPOROUS SILICAGEL MODIFIED WITH L-CYSTEINE
    G Ulugboyeva, N Kuliboyeva, J Uzokov, N Fazliyeva, N Mukhamadiev
    Issue 3 of 2025 (151/2) 3 (174), 5-10 , 2025
    2025
  • SYNTHESIS OF TITANIUM DIOXIDE NANOPARTICLES AND THE DEPENDENCE OF THEIR PHOTOCATALYTIC PROPERTIES ON PARTICLE SIZE
    S Mamaziyeva, N Avazova, R Tashmatova, N Mukhamadiev, ...
    2025 yil 3-son (151/2) 3 (174), 5-10 , 2025
    2025
  • Study of complex formation from s-triazine Cu (II) cation by quantum chemical method
    G Khodjayorova, N Muxamadiyev, J Uzokov, R Tashmatova
    AIP Conference Proceedings 3244 (1), 050027 , 2024
    2024
    Citations: 4
  • Synthesis and texture characteristics of mesoporous silica
    G Ulugboyeva, J Uzokov, N Mukhamadiev, H Norboev
    AIP Conference Proceedings 3244 (1), 050023 , 2024
    2024
    Citations: 4
  • Synthesis of mesoporous nanocomposite sorbents and their texture characteristics
    J Uzokov, A Mukhamadiyev, N Fazliyeva, I Ruziyev, N Mukhamadiyev
    AIP Conference Proceedings 3244 (1), 050020 , 2024
    2024
    Citations: 1
  • Zol-gel synthesis of ZnO/Sio 2 nanocomposite thin films
    K Usmonova, J Uzokov, N Mukhamadiev, N Fazlieva
    AIP Conference Proceedings 3244 (1), 050025 , 2024
    2024
    Citations: 2
  • SOPANINLAR ASOSIDA MAGNIT MATERIAL SINTEZI VA ULARNING TEKSTUR XARAKTERISTIKALARI
    J Uzokov, G Fayziyeva, A Muhamadiyev, N Muhamadiev
    Выпуск 5 за 2024 год (147/2) 5 (159), 5-10 , 2024
    2024
  • Zn2+ va 1, 3, 5-TRIS-(BETTA OKSOETIL) GEKSAGIDROKSO-S-TRIAZINDAN KOMPLEKS SINTEZI VA DFT TAHLILI
    G Xodjayorova, J Uzokov, A Muhamadiyev, N Fazliyeva, N Muhamadiev
    Выпуск 5 за 2024 год (147/2) 5 (159), 5-12 , 2024
    2024
  • ИЗУЧЕНИЕ ФОТОКАЛИТИЧЕСКОЙ АКТИВНОСТИ ZnO ОТНОСИТЕЛЬНО НЕКОТОРЫХ ОРГАНИЧЕСКИХ ЗАГРЯНИТЕЛЕЙ
    H Usmonova, J Uzokov, N Muhamadiev
    Выпуск 5 за 2024 год (147/2) 5 (159), 5-9 , 2024
    2024
  • Quаntum Chemicаl Study of Vаriоusly Structurаl Tiо2Nаnоclаsters with Phоtоcаtаlytic Аctivity
    АNM N.K. Mukhаmаdiyev N.Sh. Аvаzоvа, J.R. Uzоkоv
    Central Asian Journal of Medical and Natural Science 6 (1), 81-87 , 2024
    2024
  • EVALUATION OF THE EFFECTIVENESS OF USING VIRTUAL LEARNING TECHNOLOGY IN TEACHING CHEMISTRY
    UJR Ixtiyarova G.A., Boboyorova N.S., Ergashov Sh.
    SCIENCE AND INNOVATION 4 (ISSN: 2181-3337), 150-155 , 2024
    2024
  • QUANTUM CHEMICAL STUDY OF THE SYNTHESIS OF A CHILATE COMPLEX BASED ON Ni (II) CATION AND 1,3,5-TRIS-(BETTA OXOETHYL)HEXAHYDROOXO-S-TRIAZINE
    BNS Xodjayorova G.R., Ergashov Sh., Uzoqov J.R.
    SCIENCE AND INNOVATION 3 (ISSN: 2181-3337), 75-82 , 2024
    2024
    Citations: 3

MOST CITED SCHOLAR PUBLICATIONS

  • Sorption characteristics of the mesoporous sorbents based on tetraethoxysilane and titanium oxide
    NKM J.R. Uzokov
    European Journal of Molecular and Clinical Medicine 7 (Issue 7), 366-369 , 2020
    2020
    Citations: 19
  • Study of structural and electronic properties of (ZnO) n (n= 10÷ 30) nanoclusters using quantum chemical methods
    H Usmonova, JR Uzokov, NQ Mukhamadiev, AN Mukhamadiev
    central asian journal of medical and natural science 3 (6), 428-434 , 2022
    2022
    Citations: 15
  • Quantum chemical evaluation of complex formation of Co (II) ions with quercetin molecule
    X Arzimurodova, DM Ismatov, JR Uzokov, AN Mukhamadiyev, ...
    Central Asian Journal of Medical and Natural Science 3 (3), 338-344 , 2022
    2022
    Citations: 15
  • Sorption characteristics of mesoporous composite SiO2· TiO2
    JR Uzokov, NK Mukhamadiev
    Central Asian Journal of Medical and Natural Science 2 (5), 494-498 , 2021
    2021
    Citations: 14
  • Synthesis of mesoporous sorbents on the basis of Al2O3 and their textural characteristics
    AA Diyarov, NQ Mukhamadiev, M Sayitkulov Sh, JR Uzokov
    Central Asian Journal of Medical and Natural Science 3 (3), 511-518 , 2022
    2022
    Citations: 11
  • Amorphous silica gel as a surfactant for saponins: support, synthesis, and texture characteristics
    GO Ulugboyeva, JR Uzokov, NQ Mukhammadiyev, AN Mukhamadiyev
    Central Asian Journal of Medical and Natural Science 4 (2), 601-607 , 2023
    2023
    Citations: 7
  • Synthesis and their texture characteristics of mesoporous silica gel as surfactant supporting rutin
    S Mamaziyaeva, JR Uzokov, NQ Mukhammadiyev, AN Mukhamadiyev
    Central Asian Journal of Medical and Natural Science 4 (2), 608-614 , 2023
    2023
    Citations: 6
  • Synthesis of mesoporous Al2O3 and study of its sorption properties
    FN Husenov, JR Uzokov, NQ Mukhammadiyev, RV Tashmatova, ...
    Central Asian Journal of Medical and Natural Science 4 (2), 596-600 , 2023
    2023
    Citations: 5
  • Study of complex formation from s-triazine Cu (II) cation by quantum chemical method
    G Khodjayorova, N Muxamadiyev, J Uzokov, R Tashmatova
    AIP Conference Proceedings 3244 (1), 050027 , 2024
    2024
    Citations: 4
  • Synthesis and texture characteristics of mesoporous silica
    G Ulugboyeva, J Uzokov, N Mukhamadiev, H Norboev
    AIP Conference Proceedings 3244 (1), 050023 , 2024
    2024
    Citations: 4
  • Synthesis of SiO2· xZrO2 nanoporous sorbents and their texture and sorption characteristics
    J Uzokov, N Muxamadiyev, B Turayev, K Kungratov
    Science and innovation 2 (A6), 43-57 , 2023
    2023
    Citations: 4
  • SYNTHESIS OF NANOSORBENTS FOR CHROMATOGRAPHY FROM TETRAETHOXYSILANE AND METAL OXIDES
    NKM J.R. Uzokov
    PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON INTEGRATED INNOVATIVE … , 2019
    2019
    Citations: 4
  • QUANTUM CHEMICAL STUDY OF THE SYNTHESIS OF A CHILATE COMPLEX BASED ON Ni (II) CATION AND 1,3,5-TRIS-(BETTA OXOETHYL)HEXAHYDROOXO-S-TRIAZINE
    BNS Xodjayorova G.R., Ergashov Sh., Uzoqov J.R.
    SCIENCE AND INNOVATION 3 (ISSN: 2181-3337), 75-82 , 2024
    2024
    Citations: 3
  • Изучение текстурных характеристик оксида кремния как носителя катализаторов
    УЖ Сайиткулов Шухрат, Саидов Хуршед, Мухамадиев Нурали
    XXXV Всероссийский симпозиум молодых ученых по химической кинетике., 124 , 2018
    2018
    Citations: 3
  • Zol-gel synthesis of ZnO/Sio 2 nanocomposite thin films
    K Usmonova, J Uzokov, N Mukhamadiev, N Fazlieva
    AIP Conference Proceedings 3244 (1), 050025 , 2024
    2024
    Citations: 2
  • Synthesis of mesoporous nanocomposite sorbents and their texture characteristics
    J Uzokov, A Mukhamadiyev, N Fazliyeva, I Ruziyev, N Mukhamadiyev
    AIP Conference Proceedings 3244 (1), 050020 , 2024
    2024
    Citations: 1
  • Metanning karbonatli konversiyasi kinetikasi va mexanizmi
    N Muhamadiev, K Saidov, S Sayitkulov, J Uzokov
    Выпуск 1 за 2024 год (143/2) 1 (149), 5-12 , 2024
    2024
    Citations: 1
  • XROMATOGRAFIYA UCHUN TETRAETOKSISILAN VA METALL OKSIDLARI ASOSIDA ZOL-GEL TEXNOLOGIYASI BO’YICHA NANOSORBENT OLISH.
    JR Uzoqov, NQ Muxamadiev, SH Sayitqulov
    Uzbek Chemical Journal/O'Zbekiston Kimyo Jurnali , 2019
    2019
    Citations: 1
  • Quantum chemical study of the photocatalytically active Mo-quercetin complex
    J Uzokov, S Kosimov, A Muxamadiev, A Voxidov, N Mukhamadiev, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025
  • Elemental composition, spectral characteristics, and quantum chemical insights into SRTIO3 perovoskite
    M Hayitova, M Baxranova, J Uzokov, A Muxamadiev, N Mukhamadiev, ...
    Advanced Materials for Optics and Photonics: Chemistry and Engineering … , 2025
    2025