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Nomination "Top peer-reviewer"
Web of Science 2020 award
Scopus award 2018
Our research group focuses on the nanomaterials design for applications in energy, bioimaging, photocatalysis, sensing, and security.
Mesoporous silica nanoparticles (NPs) exhibiting magnetic, fluorescent, or magneto-fluorescent properties have attracted enormous attention because of the rapid development of theranostic nanoprobes. In this study, we report the simple yet efficient soaking method for the development of fluorescent mesoporous silica NPs within the size range of ~71–105 nm. Nitrogen adsorption-desorption experiments revealed that prepared SiO2-Eu NPs exhibit a large surface area of ~649 m2 g−1 that is suitable for potential drug delivery purposes. Photoluminescence study suggested that SiO2-Eu NPs emit a typical red emission with a maximum of ~615 nm and a quantum yield of ~7.94%. It is suggested that the proposed method can be extended to the fabrication of other metal-doped silica NPs.
Anara Molkenova; Zhanbota Oteulina; Timur Sh Atabaev. Europium (III)-doped mesoporous silica nanoparticles (SiO2-Eu NPs) prepared via the soaking method. Results in Materials 2021, 11, 100209 .
AMA StyleAnara Molkenova, Zhanbota Oteulina, Timur Sh Atabaev. Europium (III)-doped mesoporous silica nanoparticles (SiO2-Eu NPs) prepared via the soaking method. Results in Materials. 2021; 11 ():100209.
Chicago/Turabian StyleAnara Molkenova; Zhanbota Oteulina; Timur Sh Atabaev. 2021. "Europium (III)-doped mesoporous silica nanoparticles (SiO2-Eu NPs) prepared via the soaking method." Results in Materials 11, no. : 100209.
In this study, hierarchically-structured hollow CuO microspheres were utilized for potential solar light-assisted degradation of a model pollutant dye. Morphological analysis revealed that prepared hollow CuO microspheres (~9–16 µm) composed of small crystal strips pointed towards the center of the microsphere. Nitrogen adsorption–desorption experiments revealed that prepared hollow CuO microspheres have a specific surface area of ~12.184 m2/g. It was shown that prepared CuO microspheres can be used as an effective H2O2-assisted solar light-activated photocatalyst. In particular, prepared CuO microspheres significantly accelerate the degradation rate of aqueous Rhodamine B dye solution as compared to some other CuO structures reported to date. The recyclability study revealed that these CuO microspheres can be re-used several times without losing the photocatalytic activity.
Anara Molkenova; Sagyntay Sarsenov; Shanazar Atabaev; Laura Khamkhash; Timur Sh. Atabaev. Hierarchically-structured hollow CuO microparticles for efficient photo-Fenton like degradation of a model pollutant dye under the solar light illumination. Environmental Nanotechnology, Monitoring & Management 2021, 16, 100507 .
AMA StyleAnara Molkenova, Sagyntay Sarsenov, Shanazar Atabaev, Laura Khamkhash, Timur Sh. Atabaev. Hierarchically-structured hollow CuO microparticles for efficient photo-Fenton like degradation of a model pollutant dye under the solar light illumination. Environmental Nanotechnology, Monitoring & Management. 2021; 16 ():100507.
Chicago/Turabian StyleAnara Molkenova; Sagyntay Sarsenov; Shanazar Atabaev; Laura Khamkhash; Timur Sh. Atabaev. 2021. "Hierarchically-structured hollow CuO microparticles for efficient photo-Fenton like degradation of a model pollutant dye under the solar light illumination." Environmental Nanotechnology, Monitoring & Management 16, no. : 100507.
Regeneration of damaged tissues or organs is one of the significant challenges in tissue engineering and regenerative medicine. Many researchers have fabricated various scaffolds to accelerate the tissue regeneration process. However, most of the scaffolds are limited in clinical trials due to scaffold inconsistency, non-biodegradability, and lack of non-invasive techniques to monitor tissue regeneration after implantation. Recently, carbon dots (CDs) mediated fluorescent scaffolds are widely explored for the application of image-guided tissue engineering due to their controlled architecture, light-emitting ability, higher chemical and photostability, excellent biocompatibility, and biodegradability. In this review, we provide an overview of the recent advancement of CDs in terms of their different synthesis methods, tunable physicochemical, mechanical, and optical properties, and their application in tissue engineering. Finally, this review concludes the further research directions that can be explored to apply CDs in tissue engineering.
Mohan Vedhanayagam; Iruthayapandi Raja; Anara Molkenova; Timur Atabaev; Kalarical Sreeram; Dong-Wook Han. Carbon Dots-Mediated Fluorescent Scaffolds: Recent Trends in Image-Guided Tissue Engineering Applications. International Journal of Molecular Sciences 2021, 22, 5378 .
AMA StyleMohan Vedhanayagam, Iruthayapandi Raja, Anara Molkenova, Timur Atabaev, Kalarical Sreeram, Dong-Wook Han. Carbon Dots-Mediated Fluorescent Scaffolds: Recent Trends in Image-Guided Tissue Engineering Applications. International Journal of Molecular Sciences. 2021; 22 (10):5378.
Chicago/Turabian StyleMohan Vedhanayagam; Iruthayapandi Raja; Anara Molkenova; Timur Atabaev; Kalarical Sreeram; Dong-Wook Han. 2021. "Carbon Dots-Mediated Fluorescent Scaffolds: Recent Trends in Image-Guided Tissue Engineering Applications." International Journal of Molecular Sciences 22, no. 10: 5378.
The design of multifunctional agents became a pivotal task for the development of personalized medicine. In this study, we investigated the potential applicability of mesoporous silica decorated with gold nanoparticles (MS-Au NPs) for effective X-ray attenuation in computed tomography (CT) and as a potential vehicle for drug delivery. The physicochemical properties and X-ray attenuation efficiency of prepared MS-Au NPs were systematically studied using a range of characterization techniques and clinical CT correspondingly. CT analysis revealed that prepared MS-Au NPs exhibit high X-ray attenuation efficiency ∼9.8 HU/mM (Hounsfield Units per mM of Au) as compared to other perspective metal-based nanoparticles reported in the literature. An improved X-ray attenuation efficiency can be attributed to the presence of a large amount of Au nanoparticles in a confined volume unit.
Tomiris Mulikova; Aiganym Abduraimova; Anara Molkenova; Svetlana Em; Bakyt Duisenbayeva; Dong-Wook Han; Timur Sh. Atabaev. Mesoporous silica decorated with gold nanoparticles as a promising nanoprobe for effective CT X-ray attenuation and potential drug delivery. Nano-Structures & Nano-Objects 2021, 26, 100712 .
AMA StyleTomiris Mulikova, Aiganym Abduraimova, Anara Molkenova, Svetlana Em, Bakyt Duisenbayeva, Dong-Wook Han, Timur Sh. Atabaev. Mesoporous silica decorated with gold nanoparticles as a promising nanoprobe for effective CT X-ray attenuation and potential drug delivery. Nano-Structures & Nano-Objects. 2021; 26 ():100712.
Chicago/Turabian StyleTomiris Mulikova; Aiganym Abduraimova; Anara Molkenova; Svetlana Em; Bakyt Duisenbayeva; Dong-Wook Han; Timur Sh. Atabaev. 2021. "Mesoporous silica decorated with gold nanoparticles as a promising nanoprobe for effective CT X-ray attenuation and potential drug delivery." Nano-Structures & Nano-Objects 26, no. : 100712.
Rare-earth metal oxide nanoparticles considered promising contrast agents for x-ray computed tomography (CT) and magnetic resonance imaging (MRI). The main purpose of this study is to investigate the potential applicability of polyethyleneimine (PEI)-coated Eu2O3 and Dy2O3 nanoparticles (NPs) for CT x-ray attenuation. Morphology and other physicochemical properties of prepared samples were systematically investigated using a range of characterization tools. Preliminary cytotoxicity experiments with L-929 fibroblastic cells suggested that both samples have no significant toxicity at concentrations below 100 μg ml−1. Clinical CT analysis shows that [email protected] NPs exhibit higher x-ray attenuation efficiency (~8 HU mM−1) as compared to [email protected] NPs (~5 HU mM−1).
Valentina Olifirenko; Aiganym Abduraimova; Moon Sung Kang; Iruthayapandi Selestin Raja; Bakyt Duisenbayeva; Anara Molkenova; Laura Khamkhash; Yoon-Hwae Hwang; Dong-Wook Han; Timur Sh Atabaev. Potential applicability of polyethyleneimine PEI-coated Eu2O3 and Dy2O3 nanoparticles for contrast enhancement in computed tomography. Nano Express 2021, 2, 010022 .
AMA StyleValentina Olifirenko, Aiganym Abduraimova, Moon Sung Kang, Iruthayapandi Selestin Raja, Bakyt Duisenbayeva, Anara Molkenova, Laura Khamkhash, Yoon-Hwae Hwang, Dong-Wook Han, Timur Sh Atabaev. Potential applicability of polyethyleneimine PEI-coated Eu2O3 and Dy2O3 nanoparticles for contrast enhancement in computed tomography. Nano Express. 2021; 2 (1):010022.
Chicago/Turabian StyleValentina Olifirenko; Aiganym Abduraimova; Moon Sung Kang; Iruthayapandi Selestin Raja; Bakyt Duisenbayeva; Anara Molkenova; Laura Khamkhash; Yoon-Hwae Hwang; Dong-Wook Han; Timur Sh Atabaev. 2021. "Potential applicability of polyethyleneimine PEI-coated Eu2O3 and Dy2O3 nanoparticles for contrast enhancement in computed tomography." Nano Express 2, no. 1: 010022.
To date, Ag-based nanomaterials have demonstrated a high potential to overcome antibiotic resistance issues. However, bare Ag nanomaterials are prone to agglomeration in the biological environment, which results in a loss of antibacterial activity over time. Furthermore, it is still challenging to collect small-sized Ag nanomaterials right after the synthesis process. In this study, spherical-shaped Ag nanoparticles (NPs) (~6–10 nm) were attached on the surface of cetyltrimethylammonium bromide (CTAB)-loaded mesoporous silica nanoparticles (MSNs) (~100–110 nm). Antibacterial activity tests suggested that the obtained nanocomposite can be used as a highly efficient antibacterial agent against both Gram-negative and Gram-positive bacterial strains. The minimum inhibitory concentration (MIC) recalculated to pure Ag weight in nanocomposite was found to be ~1.84 µg/mL (for Escherichia coli) and ~0.92 µg/mL (for Staphylococcus aureus)—significantly smaller compared to values reported to date. The improved antibacterial activity of the prepared nanocomposite can be attributed to the even distribution of non-aggregated Ag NPs per volume unit and the presence of CTAB in the nanocomposite pores.
Aiganym Abduraimova; Anara Molkenova; Assem Duisembekova; Tomiris Mulikova; Damira Kanayeva; Timur Atabaev. Cetyltrimethylammonium Bromide (CTAB)-Loaded SiO2–Ag Mesoporous Nanocomposite as an Efficient Antibacterial Agent. Nanomaterials 2021, 11, 477 .
AMA StyleAiganym Abduraimova, Anara Molkenova, Assem Duisembekova, Tomiris Mulikova, Damira Kanayeva, Timur Atabaev. Cetyltrimethylammonium Bromide (CTAB)-Loaded SiO2–Ag Mesoporous Nanocomposite as an Efficient Antibacterial Agent. Nanomaterials. 2021; 11 (2):477.
Chicago/Turabian StyleAiganym Abduraimova; Anara Molkenova; Assem Duisembekova; Tomiris Mulikova; Damira Kanayeva; Timur Atabaev. 2021. "Cetyltrimethylammonium Bromide (CTAB)-Loaded SiO2–Ag Mesoporous Nanocomposite as an Efficient Antibacterial Agent." Nanomaterials 11, no. 2: 477.
In the conventional sandwich structure of perovskite solar cells (PSCs) with the metallic electrodes, the parasitic absorption losses due to the presence of glass substrate, conductive metal oxides and other functional layers below the perovskite film reduce a certain portion of photons that can be harvested by the perovskite absorber. The carbon quantum dots (CQDs) with down-converting properties can absorb high-energy UV light and convert them into the photons with lower energy lying in the visible light region. The CQDs can be used to enhance the light harvesting power of the PSCs so that the negative effect due to the parasitic absorption can be suppressed. In this work, a coating layer composed of CQDs is deposited on the illuminated side of the glass substrate. In contrast to our previous report, the deionized water (DIW) is used to disperse the CQDs instead of dispersing CQDs in the matrix of PMMA and chlorobenzene (CB). By using the new approach, the preparation of CQD coatings is more efficient and the use of toxic CB can be avoided. After systematic optimization of the preparation parameters, it is found that using water as the dispersion medium for CQDs can also yield the effective coatings for PSCs to enhance their light absorption power.
Askar A. Maxim; Damir Aidarkhanov; Timur Sh. Atabaev; Askhat N. Jumabekov; Annie Ng. Light management in perovskite solar cell by incorporation of carbon quantum dots. Materials Today: Proceedings 2021, 1 .
AMA StyleAskar A. Maxim, Damir Aidarkhanov, Timur Sh. Atabaev, Askhat N. Jumabekov, Annie Ng. Light management in perovskite solar cell by incorporation of carbon quantum dots. Materials Today: Proceedings. 2021; ():1.
Chicago/Turabian StyleAskar A. Maxim; Damir Aidarkhanov; Timur Sh. Atabaev; Askhat N. Jumabekov; Annie Ng. 2021. "Light management in perovskite solar cell by incorporation of carbon quantum dots." Materials Today: Proceedings , no. : 1.
Editorial: Fluorescent Carbon-Based Nanostructures for Bioimaging Applications
Timur Sh. Atabaev; Dong-Wook Han. Editorial: Fluorescent Carbon-Based Nanostructures for Bioimaging Applications. Frontiers in Chemistry 2020, 8, 1 .
AMA StyleTimur Sh. Atabaev, Dong-Wook Han. Editorial: Fluorescent Carbon-Based Nanostructures for Bioimaging Applications. Frontiers in Chemistry. 2020; 8 ():1.
Chicago/Turabian StyleTimur Sh. Atabaev; Dong-Wook Han. 2020. "Editorial: Fluorescent Carbon-Based Nanostructures for Bioimaging Applications." Frontiers in Chemistry 8, no. : 1.
In this study, magnetic Fe3O4 particles and Fe3O4-Ag0 nanocomposites were prepared by a facile and green method, fully characterized and used for the removal of Hg2+ from water. Characterizations showed that the Fe3O4 particles are quasi-spherical with an average diameter of 217 nm and metallic silver nanoparticles formed on the surface with a size of 23–41 nm. The initial Hg2+ removal rate was very fast followed by a slow increase and the maximum solid phase loading was 71.3 mg/g for the Fe3O4-Ag0 and 28 mg/g for the bare Fe3O4. The removal mechanism is complex, involving Hg2+ adsorption and reduction, Fe2+ and Ag0 oxidation accompanied with reactions of Cl− with Hg+ and Ag+. The facile and green synthesis process, the fast kinetics and high removal capacity and the possibility of magnetic separation make Fe3O4-Ag0 nanocomposites attractive materials for the removal of Hg2+ from water.
Vassilis Inglezakis; Aliya Kurbanova; Anara Molkenova; Antonis Zorpas; Timur Atabaev. Magnetic Fe3O4-Ag0 Nanocomposites for Effective Mercury Removal from Water. Sustainability 2020, 12, 5489 .
AMA StyleVassilis Inglezakis, Aliya Kurbanova, Anara Molkenova, Antonis Zorpas, Timur Atabaev. Magnetic Fe3O4-Ag0 Nanocomposites for Effective Mercury Removal from Water. Sustainability. 2020; 12 (13):5489.
Chicago/Turabian StyleVassilis Inglezakis; Aliya Kurbanova; Anara Molkenova; Antonis Zorpas; Timur Atabaev. 2020. "Magnetic Fe3O4-Ag0 Nanocomposites for Effective Mercury Removal from Water." Sustainability 12, no. 13: 5489.
Transparent titanium oxide thin films attract enormous attention from the scientific community because of their prominent properties, such as low-cost, chemical stability, and optical transparency in the visible region. In this study, we developed an easy and scalable solution-based process for the deposition of transparent TiOx thin films on glass substrates. We showed that the proposed method is also suitable for the fabrication of metal-doped TiOx thin films. As proof-of-the-concept, europium Eu(III) ions were introduced into TiOx film. A photoluminescence (PL) study revealed that Eu-doped TiOx thin films showed strong red luminescence associated with 5D0→7Fj relaxation transitions in Eu (III). We found that prepared TiOx thin films significantly reduce the transmittance of destructive UV radiation; a feature that can be useful for the protection of photovoltaic devices. In addition, transparent and luminescent TiOx thin films can be utilized for potential security labeling.
Anara Molkenova; Laura Khamkhash; Ainur Zhussupbekova; Kuanysh Zhussupbekov; Sagyntay Sarsenov; Izumi Taniguchi; Igor Shvets; Timur Sh. Atabaev. Solution-Based Deposition of Transparent Eu-Doped Titanium Oxide Thin Films for Potential Security Labeling and UV Screening. Nanomaterials 2020, 10, 1132 .
AMA StyleAnara Molkenova, Laura Khamkhash, Ainur Zhussupbekova, Kuanysh Zhussupbekov, Sagyntay Sarsenov, Izumi Taniguchi, Igor Shvets, Timur Sh. Atabaev. Solution-Based Deposition of Transparent Eu-Doped Titanium Oxide Thin Films for Potential Security Labeling and UV Screening. Nanomaterials. 2020; 10 (6):1132.
Chicago/Turabian StyleAnara Molkenova; Laura Khamkhash; Ainur Zhussupbekova; Kuanysh Zhussupbekov; Sagyntay Sarsenov; Izumi Taniguchi; Igor Shvets; Timur Sh. Atabaev. 2020. "Solution-Based Deposition of Transparent Eu-Doped Titanium Oxide Thin Films for Potential Security Labeling and UV Screening." Nanomaterials 10, no. 6: 1132.
We prepared the ZnO nanocomposites with WO3 or CuO nanostructures to improve the photocatalytic performance of ZnO nanostructures. The characterizations of the nanocomposites by using SEM, X-ray diffractor, UV-vis spectrometer, and photoluminescence reveal the morphologies and wide light absorption range of materials. The highest current densities of WO3/ZnO and CuO/ZnO nanocomposites were up to 1.28 mA/cm2 and 2.49 mA/cm2 at 1.23V (vs RHE) under AM 1.5 100 mW/cm2, which are ~ 1.2 and 3.5-fold greater than that of the ZnO nanostructures, respectively. The facile fabrication process suggests that nanocomposite with narrow bandgap materials, such as WO3 and CuO, would improve the performance of electrochemical and optoelectrical devices, such as dye-sensitized solar cells and biosensor.
Trang Nguyen Thi Thuy; Soo Kyung Cho; Yerkezhan Amangeldinova; Dayoung Yoo; Gulmaral Tukyei; Yana Sissembayeva; Timur Sh. Atabaev; Dongyun Lee; Jaebeom Lee; Nang Dinh Nguyen; Hyung Kook Kim; Dong-Myeong Shin; Yoon-Hwae Hwang. WO3–ZnO and CuO–ZnO nanocomposites as highly efficient photoanodes under visible light illumination. Nanotechnology 2020, 31, 255702 .
AMA StyleTrang Nguyen Thi Thuy, Soo Kyung Cho, Yerkezhan Amangeldinova, Dayoung Yoo, Gulmaral Tukyei, Yana Sissembayeva, Timur Sh. Atabaev, Dongyun Lee, Jaebeom Lee, Nang Dinh Nguyen, Hyung Kook Kim, Dong-Myeong Shin, Yoon-Hwae Hwang. WO3–ZnO and CuO–ZnO nanocomposites as highly efficient photoanodes under visible light illumination. Nanotechnology. 2020; 31 (25):255702.
Chicago/Turabian StyleTrang Nguyen Thi Thuy; Soo Kyung Cho; Yerkezhan Amangeldinova; Dayoung Yoo; Gulmaral Tukyei; Yana Sissembayeva; Timur Sh. Atabaev; Dongyun Lee; Jaebeom Lee; Nang Dinh Nguyen; Hyung Kook Kim; Dong-Myeong Shin; Yoon-Hwae Hwang. 2020. "WO3–ZnO and CuO–ZnO nanocomposites as highly efficient photoanodes under visible light illumination." Nanotechnology 31, no. 25: 255702.
Perovskite solar cells (PSCs) with a standard sandwich structure suffer from optical transmission losses due to the substrate and its active layers. Developing strategies for compensating for the losses in light harvesting is of significant importance to achieving a further enhancement in device efficiencies. In this work, the down-conversion effect of carbon quantum dots (CQDs) was employed to convert the UV fraction of the incident light into visible light. For this, thin films of poly(methyl methacrylate) with embedded carbon quantum dots ([email protected]) were deposited on the illumination side of PSCs. Analysis of the device performances before and after application of [email protected] photoactive functional film on PSCs revealed that the devices with the coating showed an improved photocurrent and fill factor, resulting in higher device efficiency.
Askar A. Maxim; Shynggys N. Sadyk; Damir Aidarkhanov; Charles Surya; Annie Ng; Yoon-Hwae Hwang; Timur Sh. Atabaev; Askhat N. Jumabekov. PMMA Thin Film with Embedded Carbon Quantum Dots for Post-Fabrication Improvement of Light Harvesting in Perovskite Solar Cells. Nanomaterials 2020, 10, 291 .
AMA StyleAskar A. Maxim, Shynggys N. Sadyk, Damir Aidarkhanov, Charles Surya, Annie Ng, Yoon-Hwae Hwang, Timur Sh. Atabaev, Askhat N. Jumabekov. PMMA Thin Film with Embedded Carbon Quantum Dots for Post-Fabrication Improvement of Light Harvesting in Perovskite Solar Cells. Nanomaterials. 2020; 10 (2):291.
Chicago/Turabian StyleAskar A. Maxim; Shynggys N. Sadyk; Damir Aidarkhanov; Charles Surya; Annie Ng; Yoon-Hwae Hwang; Timur Sh. Atabaev; Askhat N. Jumabekov. 2020. "PMMA Thin Film with Embedded Carbon Quantum Dots for Post-Fabrication Improvement of Light Harvesting in Perovskite Solar Cells." Nanomaterials 10, no. 2: 291.
Recently, low-cost hematite (α-Fe2O3) metal oxide semiconductor has attracted enormous attention for the photoelectrochemical water splitting and photocatalytic applications. The main purpose of this work is to study the effects of Sn-doping on the photocatalytic properties of hematite nanoparticles (NPs). Morphology and physicochemical properties of prepared samples were analyzed using X-ray diffraction analysis (XRD), transmission electron microscope (TEM), and UV-vis spectroscopy. Rhodamine B (RB) dye was used as a model organic pollutant to test the photocatalytic activity of prepared samples. It was found that the photocatalytic activity of Sn-doped hematite NPs was higher than that of the undoped hematite NPs. The recyclability tests suggested that 3 mol% Sn-doped hematite NPs can be used as a promising reusable photocatalyst for dyes degradation.
Svetlana Em; Mussa Yedigenov; Laura Khamkhash; Anara Molkenova; Timur Sh. Atabaev. Sn-Doped Hematite Nanoparticles for Potential Photocatalytic Dye Degradation. IOP Conference Series: Materials Science and Engineering 2020, 739, 012042 .
AMA StyleSvetlana Em, Mussa Yedigenov, Laura Khamkhash, Anara Molkenova, Timur Sh. Atabaev. Sn-Doped Hematite Nanoparticles for Potential Photocatalytic Dye Degradation. IOP Conference Series: Materials Science and Engineering. 2020; 739 (1):012042.
Chicago/Turabian StyleSvetlana Em; Mussa Yedigenov; Laura Khamkhash; Anara Molkenova; Timur Sh. Atabaev. 2020. "Sn-Doped Hematite Nanoparticles for Potential Photocatalytic Dye Degradation." IOP Conference Series: Materials Science and Engineering 739, no. 1: 012042.
In this study, we described the quick synthesis strategy of stable colloidal silica particles encapsulated with a fluorescent dye. Atomic Force Microscopy AFM, Fourier-Transform Infrared Spectroscopy FTIR, and Fluorescence Spectroscopy FS were utilized to characterize the obtained silica particles. AFM analysis revealed that obtained silica particles have a spherical shape with a mean size of 210 ± 13 nm. FS analysis showed that fluorescent dye was successfully incorporated into a silica matrix. In particular, eye-visible green fluorescence emission with a peak maximum at 526 nm was detected. The emission stability of prepared particles was tested in a biologically-relevant pH range, under constant UV irradiation and at different storage time intervals.
Tomiris Mulikova; Laura Khamkhash; Kanat Dukenbayev; Anara Molkenova; Timur Sh. Atabaev. Stable Colloidal Silica Particles Doped with a Fluorescent Dye. IOP Conference Series: Materials Science and Engineering 2020, 739, 012039 .
AMA StyleTomiris Mulikova, Laura Khamkhash, Kanat Dukenbayev, Anara Molkenova, Timur Sh. Atabaev. Stable Colloidal Silica Particles Doped with a Fluorescent Dye. IOP Conference Series: Materials Science and Engineering. 2020; 739 (1):012039.
Chicago/Turabian StyleTomiris Mulikova; Laura Khamkhash; Kanat Dukenbayev; Anara Molkenova; Timur Sh. Atabaev. 2020. "Stable Colloidal Silica Particles Doped with a Fluorescent Dye." IOP Conference Series: Materials Science and Engineering 739, no. 1: 012039.
In this study, one-dimensional hematite (α-Fe2O3) nanoneedles were synthesized using a facile hydrothermal method. The morphology, structural and photocatalytic properties of prepared hematite nanoneedles were analyzed using a range of analysis techniques. In particular, the photocatalytic activity of prepared samples were evaluated by UV-light assisted degradation of Rhodamine B dye. It was shown that the prepared hematite nanoneedles can be potentially applied for wastewater treatment thanks to good photocatalytic properties
Yerkezhan Amangeldinova; Dimaral Aben; Timur Sh. Atabaev. One-dimensional hematite nanoneedles for the potential degradation of organic dyes. Materials Today: Proceedings 2020, 20, 237 -240.
AMA StyleYerkezhan Amangeldinova, Dimaral Aben, Timur Sh. Atabaev. One-dimensional hematite nanoneedles for the potential degradation of organic dyes. Materials Today: Proceedings. 2020; 20 ():237-240.
Chicago/Turabian StyleYerkezhan Amangeldinova; Dimaral Aben; Timur Sh. Atabaev. 2020. "One-dimensional hematite nanoneedles for the potential degradation of organic dyes." Materials Today: Proceedings 20, no. : 237-240.
This study reports on the synthesis of Eu and Li-codoped zirconia ZrO2 nanoparticles (NPs) using a facile urea precipitation method. The morphology, structural and optical properties of prepared Eu, Li-codoped ZrO2 NPs were analyzed by transmission electron microscope (TEM), X-ray diffraction (XRD), and photoluminescence (PL), respectively. As the main goal of this study, we investigated the effects of Li-codoping on the optical properties of Eu-doped ZrO2 NPs. Strong eye-visible red emission due to 5D0→7F1 and 5D0→7F2 transitions was detected under continuous 250 nm excitation. Thanks to excellent optical properties, prepared Eu, Li-codoped ZrO2 NPs can be used for solid-state lighting, security printing, etc
Dimaral Aben; Yerkezhan Amangeldinova; Timur Sh. Atabaev. Eu, Li codoped zirconia nanoparticles with enhanced optical properties. Materials Today: Proceedings 2020, 20, 241 -244.
AMA StyleDimaral Aben, Yerkezhan Amangeldinova, Timur Sh. Atabaev. Eu, Li codoped zirconia nanoparticles with enhanced optical properties. Materials Today: Proceedings. 2020; 20 ():241-244.
Chicago/Turabian StyleDimaral Aben; Yerkezhan Amangeldinova; Timur Sh. Atabaev. 2020. "Eu, Li codoped zirconia nanoparticles with enhanced optical properties." Materials Today: Proceedings 20, no. : 241-244.
In the present work, the photocatalytic degradation and mineralization of 4-tert-butylphenol in water was studied using Fe-doped TiO2 nanoparticles under UV light irradiation. Fe-doped TiO2 catalysts (0.5, 1, 2 and 4 wt.%) were prepared using wet impregnation and characterized via SEM/EDS, XRD, XRF and TEM, while their photocatalytic activity and stability was attended via total organic carbon, 4-tert-butyl phenol, acetic acid, formic acid and leached iron concentrations measurements. The effect of H2O2 addition was also examined. The 4% Fe/TiO2 demonstrated the highest photocatalytic efficiency in terms of total organic carbon removal (86%). The application of UV/H2O2 resulted in 31% total organic carbon removal and 100% 4-t-butylphenol conversion, however combining Fe/TiO2 catalysts with H2O2 under UV irradiation did not improve the photocatalytic performance. Increasing the content of iron on the catalyst from 0.5 to 4% considerably decreased the intermediates formed and increased the production of carbon dioxide. The photocatalytic degradation of 4-tert-butylphenol followed pseudo-second order kinetics. Leaching of iron was observed mainly in the case of 4% Fe/TiO2, but it was considered negligible taking into account the iron load on catalysts. The electric energy per order was found in the range of 28–147 kWh/m3/order and increased with increasing the iron content of the catalyst.
Ardak Makhatova; Gaukhar Ulykbanova; Shynggys Sadyk; Kali Sarsenbay; Timur Sh. Atabaev; Vassilis Inglezakis; Stavros G. Poulopoulos. Degradation and mineralization of 4-tert-butylphenol in water using Fe-doped TiO2 catalysts. Scientific Reports 2019, 9, 1 .
AMA StyleArdak Makhatova, Gaukhar Ulykbanova, Shynggys Sadyk, Kali Sarsenbay, Timur Sh. Atabaev, Vassilis Inglezakis, Stavros G. Poulopoulos. Degradation and mineralization of 4-tert-butylphenol in water using Fe-doped TiO2 catalysts. Scientific Reports. 2019; 9 (1):1.
Chicago/Turabian StyleArdak Makhatova; Gaukhar Ulykbanova; Shynggys Sadyk; Kali Sarsenbay; Timur Sh. Atabaev; Vassilis Inglezakis; Stavros G. Poulopoulos. 2019. "Degradation and mineralization of 4-tert-butylphenol in water using Fe-doped TiO2 catalysts." Scientific Reports 9, no. 1: 1.
Upconversion (UC) lanthanide nanomaterials have attracted enormous attention in the last two decades thanks to their unique ability to convert low-energy infrared photons into high-energy photons. In this mini-review, we briefly discussed the recent achievements related to the direct utilization of UC optical nanomaterials for photocatalysis and photovoltaic applications. In particular, selected examples of UC-containing devices/nanocomposites with improved performance were covered. In addition, we outlined some challenges and future trends associated with the widespread usage of UC nanomaterials.
Timur Atabaev; Anara Molkenova. Upconversion optical nanomaterials applied for photocatalysis and photovoltaics: Recent advances and perspectives. Frontiers of Materials Science 2019, 13, 335 -341.
AMA StyleTimur Atabaev, Anara Molkenova. Upconversion optical nanomaterials applied for photocatalysis and photovoltaics: Recent advances and perspectives. Frontiers of Materials Science. 2019; 13 (4):335-341.
Chicago/Turabian StyleTimur Atabaev; Anara Molkenova. 2019. "Upconversion optical nanomaterials applied for photocatalysis and photovoltaics: Recent advances and perspectives." Frontiers of Materials Science 13, no. 4: 335-341.
In this study, fluorescent carbon nanoparticles (CNPs) with quantum yield of 6.08% have been synthesized using a hydrothermal method within a short period of time (t = 30 min). Fluorescence spectroscopy (FS) revealed that CNPs demonstrate excellent photostability which is suitable for prolonged bioimaging applications. Cytotoxicity study with L-929 fibroblastic cells showed that prepared CNPs are nontoxic even at relatively high concentrations up to 250 µg/ml. Strong green fluorescence signal observed from L-929 cells suggested that CNPs can be utilized for in-vitro tissues/cells bioimaging applications.
Anara Molkenova; Aidana Toleshova; Su-Jin Song; Moon Sung Kang; Aiganym Abduraimova; Dong-Wook Han; Timur Sh. Atabaev. Rapid synthesis of nontoxic and photostable carbon nanoparticles for bioimaging applications. Materials Letters 2019, 261, 127012 .
AMA StyleAnara Molkenova, Aidana Toleshova, Su-Jin Song, Moon Sung Kang, Aiganym Abduraimova, Dong-Wook Han, Timur Sh. Atabaev. Rapid synthesis of nontoxic and photostable carbon nanoparticles for bioimaging applications. Materials Letters. 2019; 261 ():127012.
Chicago/Turabian StyleAnara Molkenova; Aidana Toleshova; Su-Jin Song; Moon Sung Kang; Aiganym Abduraimova; Dong-Wook Han; Timur Sh. Atabaev. 2019. "Rapid synthesis of nontoxic and photostable carbon nanoparticles for bioimaging applications." Materials Letters 261, no. : 127012.
There has been a great interest in the development of new functional contrast agents for biomedical applications. In this study, we report the preparation of bifunctional core–shell nanoprobes that can be used as a T 1-weighted magnetic resonance imaging (MRI) contrast agent and fluorescent marker for cells imaging. Various analysis techniques were utilized to analyze the physicochemical properties of prepared nanoprobes. Small-animal MRI scanner (1.5 T) was utilized to measure the T 1-weighted relaxivity rate (r 1 = 5.57 ± 0.33 mM–1 s–1) of prepared nanoprobes. In addition, we showed that prepared nanoprobes can be also used for optical imaging of living cells. A pilot cytotoxicity study on L-929 fibroblastic cells showed that prepared nanoprobes are relatively safe at concentrations ≤8 μg/ml. Thus, prepared samples can be utilized as a promising bifunctional nanoprobe for in-vivo small animal MRI imaging and in-vitro tissues/cells study.
Anara Molkenova; Yong Cheol Shin; Moon Sung Kang; Tomiris Mulikova; Dong-Wook Han; Timur Atabaev. Gd2O3 Nanoparticles Coated with a Fluorescent Carbon Layer for Potential T1-Weighted Magnetic Resonance and Cells Imaging. Nanoscience and Nanotechnology Letters 2019, 11, 813 -817.
AMA StyleAnara Molkenova, Yong Cheol Shin, Moon Sung Kang, Tomiris Mulikova, Dong-Wook Han, Timur Atabaev. Gd2O3 Nanoparticles Coated with a Fluorescent Carbon Layer for Potential T1-Weighted Magnetic Resonance and Cells Imaging. Nanoscience and Nanotechnology Letters. 2019; 11 (6):813-817.
Chicago/Turabian StyleAnara Molkenova; Yong Cheol Shin; Moon Sung Kang; Tomiris Mulikova; Dong-Wook Han; Timur Atabaev. 2019. "Gd2O3 Nanoparticles Coated with a Fluorescent Carbon Layer for Potential T1-Weighted Magnetic Resonance and Cells Imaging." Nanoscience and Nanotechnology Letters 11, no. 6: 813-817.