Article
Chemistry, Multidisciplinary
Linda Zh. Nikoshvili, Kristina N. Shkerina, Alexey V. Bykov, Alexander I. Sidorov, Alexander L. Vasiliev, Mikhail G. Sulman, Lioubov Kiwi-Minsker
Summary: This study utilizes nanoparticles catalyst stabilized by hyper-cross-linked polystyrene to achieve high-efficiency coupling reaction between phenylboronic acid and 4-bromoanisole in an ethanol-water solvent, and the introduction of other metallic elements enhances the activity of the catalyst.
Article
Biochemistry & Molecular Biology
Alexey Bykov, Galina N. Demidenko, Linda Zh Nikoshvili, Lioubov Kiwi-Minsker
Summary: This study demonstrates the excellent stability of hyper-cross-linked polystyrene (HPS) in stabilizing small Pd-n and Pt-n clusters. The adsorption of benzene rings results in noticeable energy gain and stabilization of the adsorption complexes. Additionally, the interaction between metal clusters and HPS micropores plays a crucial role in the stabilization of the polymer structure.
Article
Chemistry, Applied
Fada Li, Yiwen Cao, Xiaoxue Hong, Bo Chen, Mancai Xu
Summary: This study successfully synthesized hyper-cross-linked polystyrene networks with high surface area through a two-step reaction, showing that the physical properties can be adjusted by changing the structure of cross-linkers to enhance the adsorption performance for phenol.
REACTIVE & FUNCTIONAL POLYMERS
(2021)
Article
Engineering, Electrical & Electronic
Ajay P. Manuel, Saralyn Riddell, Harshitha Rajashekhar, Damini Vrushabendrakumar, Kazi M. Alam, Pawan Kumar, Sergey Gusarov, Alexander E. Kobryn, Mustafa Supur, Richard L. McCreery, Karthik Shankar
Summary: Core-shell Au@Pt nanoislands were fabricated on glass substrates using magnetron sputtering and thermal annealing. Addition of ultrathin Pt shells caused redshift and broadening of the localized surface plasmon resonance peak of Au. The coated Au@Pt nanoislands showed superior methylene blue degradation performance and hot carrier injection was validated by Raman thermometry studies.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Gauravjyoti D. Kalita, Podma P. Sarmah, Golap Kalita, Pankaj Das
Summary: A facile ligand-assisted approach was used to synthesize bimetallic Au-Pd nanoparticles with a tunable core@shell structure. The Au-Pd materials exhibited superior performance in two important reactions, with the Pd-core-Au-shell structure showing higher activity compared to the Au-core-Pd-shell structure.
NANOSCALE ADVANCES
(2021)
Article
Engineering, Chemical
Yevgen Nazarenko, Chitra Narayanan, Hannah Szeptycki, Aflah Kayium, Parisa A. Ariya
Summary: The study looked into the effectiveness of hyper-cross-linked polystyrenic sorbents, with the nanostructured MN270 showing a reduction of formaldehyde concentration by over 95% in short-term tests, comparable to the performance of activated carbon. The nanostructure and high specific surface area of MN270 played a key role in its superior sorptive properties.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Polymer Science
Sara Senorans, Isabel Valencia, Estibaliz Merino, Marta Iglesias, Manuel A. Fernandez-Rodriguez, Eva M. Maya
Summary: The first example of a porous polymer containing B-N covalent bonds prepared using the solvent knitting strategy is reported. The polymer exhibits micromeso porosity, high thermal stability, and potential properties as a highly stable and efficient photocatalyst. After the first run, the catalyst improves its photocatalytic activity and maintains this activity in successive runs, making it a new type of material with potential applications.
Article
Multidisciplinary Sciences
Xiaoyang Huang, Ouardia Akdim, Mark Douthwaite, Kai Wang, Liang Zhao, Richard J. Lewis, Samuel Pattisson, Isaac T. Daniel, Peter J. Miedziak, Greg Shaw, David J. Morgan, Sultan M. Althahban, Thomas E. Davies, Qian He, Fei Wang, Jile Fu, Donald Bethell, Steven McIntosh, Christopher J. Kiely, Graham J. Hutchings
Summary: This study demonstrates that the reaction rate can be almost doubled by separating the gold and palladium components in bimetallic carbon-supported catalysts. The enhancement is attributed to the coupling of separate redox processes occurring at isolated gold and palladium sites.
Article
Engineering, Chemical
Valentin N. Sapunov, Linda Z. Nikoshvili, Elena S. Bakhvalova, Mikhail G. Sulman, Valentina G. Matveeva
Summary: Palladium nanoparticles and compounds have shown to be effective catalysts for organic synthesis. This study focuses on the preparation and comparison of Pd(0) or Pd(II) supported/embedded in hyper-cross-linked polystyrene (HPS) for Suzuki cross-coupling reactions. The study also discusses the difference in activity between Pd(0) and Pd(II) catalysts, as well as proposes a mathematical model for the reaction.
Article
Chemistry, Physical
Aleksei Nikitich Kolodin
Summary: A method for hydrophilizing polystyrene substrate surfaces using gold nanoparticle organosol is proposed in this study, with detailed description of the hydrophilization process and mechanism. Experimental results demonstrate the universality of the method and the ability to obtain hydrophilic and superhydrophilic substrates from other materials.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Physical
Abdulelah Taher Ali Mohammed, Lijian Wang, Ronghua Jin, Guohua Liu, Chunxia Tan
Summary: The high stability heterogeneous catalyst HS@PdPPh2@MSN was constructed by immobilizing bis((diphenylphosphino)ethyltriethoxysilane)palladium acetate onto the inner wall of a mesoporous organicsilicane hollow shell, showing a well-defined single-site active species within the silicate network. It enabled an efficient Suzuki-Miyaura cross-coupling reaction with up to 95% yield in mild conditions, and could be reused at least five times with good activity, making it a cost-effective and easily synthesized candidate for fine chemical engineering.
Article
Biochemistry & Molecular Biology
Elena S. Bakhvalova, Arina O. Pinyukova, Alexey V. Mikheev, Galina N. Demidenko, Mikhail G. Sulman, Alexey V. Bykov, Linda Z. Nikoshvili, Lioubov Kiwi-Minsker
Summary: The study demonstrated that noble metal nanoparticles stabilized in hyper-cross-linked polystyrene effectively catalyzed the hydrogenation of various arenes in different medium and allowed for multiple catalyst reuses.
Article
Engineering, Environmental
Yifan Xu, Limin Liu, Yueqing Xu, Xiaofei Yan, Cheng Zhang, Zifei Sun, Xiaochen Lin, Yufeng Duan, Houhu Zhang
Summary: Transforming waste polystyrene into highly porous hyper-cross-linked polymers is a cost-effective method for developing efficient adsorbents for flue gas demercuration, which is crucial for human health and environmental protection.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Analytical
Vadym Borysiuk, Iakov A. Lyashenko, Valentin L. Popov
Summary: Thermal stability of triple layered Au@Pt@Au core-shell nanoparticles for H2O2 bi-directional sensing was investigated through computational study. The raspberry-like shape of the nanoparticles and their structural parameters were studied using classical molecular dynamics simulations. The results showed that the core-shell structure of the nanoparticles was maintained up to approximately 900 K, but was destroyed at higher temperatures.
Article
Materials Science, Multidisciplinary
Hui Ma, Qing-Mei Zhang, Guang Cheng, Zhen Wang, Qian-Shou Zong, Bien Tan, Chun Zhang
Summary: In this study, seven hyper-cross-linked porous polymers containing boron, nitrogen, and sulfur atoms were synthesized. It was found that surface area and pore accessibility are key factors for improving iodine capture capacities, and doping heteroatoms can influence the affinity between HCPs and iodine, thereby affecting the pore accessibility of the materials.
ACS APPLIED POLYMER MATERIALS
(2021)
Article
Chemistry, Physical
Maxim E. Grigorev, Stepan P. Mikhailov, Alexey Bykov, Irina Yu Tiamina, Linda Zh Nikoshvili, Mikhail G. Sulman, Alexander L. Vasiliev, Alexander Sidorov, Thatiane dos Santos, Mario R. Meneghetti, Simoni M. Plentz Meneghetti, Lyudmila M. Bronstein, Valentina G. Matveeva
Summary: In this study, novel Ru-containing catalysts based on porous metal oxide supports were developed and tested for the hydrogenation of biomass to gamma-valerolactone. The evaluation of structure, porosity, acidity, and morphology revealed differences in stabilization of small Ru-containing nanoparticles on various supports, with Ru/Nb2O5 showing the best catalytic performance and stability. This work demonstrates the importance of surface interactions on metal oxides in developing efficient catalytic systems.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Lyuba Ilieva, Ivan Ivanov, Janusz W. Sobczak, Wojciech Lisowski, Daniela Karashanova, Zbigniew Kaszkur, Petya Petrova, Tatyana Tabakova
Summary: The study explores the performance of catalysts prepared by different synthesis methods for the water-gas shift (WGS) reaction. It is found that catalysts prepared by mechanochemical mixing show better performance in the WGS reaction compared to those prepared by impregnation. Additionally, the introduction of yttria doping has a positive effect on catalyst performance. The study is significant for the development of WGS catalysts with good performance and economic benefits, aiming to improve hydrogen purity for small-scale applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Biochemistry & Molecular Biology
Svetlana A. Sorokina, Stepan P. Mikhailov, Nina V. Kuchkina, Alexey V. Bykov, Alexander L. Vasiliev, Mariam G. Ezernitskaya, Andrey L. Golovin, Linda Zh. Nikoshvili, Mikhail G. Sulman, Zinaida B. Shifrina
Summary: In this study, Ru nanoparticle containing nanocomposites based on hyperbranched pyridylphenylene polymer were developed as catalysts, and the functionalization with sulfuric acid significantly enhanced their activity in the hydrogenation of levulinic acid to gamma-valerolactone, allowing the reaction to proceed under mild conditions with high yield and selectivity.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Maciej Zielinski, Wojciech Juszczyk, Zbigniew Kaszkur
Summary: Our research focuses on the phenomena accompanying the adsorption of mesityl oxide on the surfaces of supported gold catalysts. By using in situ infrared spectroscopy, we found that the most active catalysts can adsorb conjugated ketones or aldehydes in the enolate form or with the C-alpha=C-beta double bond. The reductive properties of the catalysts and supports were studied using temperature-programmed reduction. We also observed that ceria and titania, when decorated with gold nanoparticles, can interact with hydrogen at lower temperatures than typical for pure oxides. Transmission electron microscopy and powder X-ray diffraction were used to characterize the morphology and structure of the catalysts.
Article
Chemistry, Multidisciplinary
Linda Zh. Nikoshvili, Kristina N. Shkerina, Alexey V. Bykov, Alexander I. Sidorov, Alexander L. Vasiliev, Mikhail G. Sulman, Lioubov Kiwi-Minsker
Summary: This study utilizes nanoparticles catalyst stabilized by hyper-cross-linked polystyrene to achieve high-efficiency coupling reaction between phenylboronic acid and 4-bromoanisole in an ethanol-water solvent, and the introduction of other metallic elements enhances the activity of the catalyst.
Article
Chemistry, Physical
Ewa Maria Iwanek (nee Wilczkowska), Leonarda Francesca Liotta, Shazam Williams, Linjie Hu, Huitian Ju, Giuseppe Pantaleo, Zbigniew Kaszkur, Donald W. Kirk, Wojciech Patkowski, Marek Glinski
Summary: The aim of these studies was to investigate the influence of alkali metal ions on the properties of nanogold catalysts supported on ceria-zirconia. The addition of alkali metal ions affected the reducibility of the catalysts, but did not have a significant impact on the activity in CO oxidation. However, the alkali metal ions suppressed the activity of the system in CO oxidation.
Article
Biochemistry & Molecular Biology
Linda Z. Nikoshvili, Alexander Y. Popov, Alexey V. Bykov, Alexander I. Sidorov, Lioubov Kiwi-Minsker
Summary: This study addresses the selective hydrogenation of alkynols using hybrid catalysts and hyper-cross-linked polystyrenes. The synthesized catalysts show high selectivity towards the target product with nearly complete conversion of the alkynols. The use of microporous and mesoporous HPS materials also provides advantages in the hydrogenation of long-chain alkynols.
Article
Chemistry, Physical
Ewa M. Iwanek (nee Wilczkowska), Marek Glinski, Aleksandra Siwiec, Sylwia Siennicka, Magdalena Zybert, Zbigniew Kaszkur
Summary: In the liquid phase catalytic transfer hydrogenation of acetophenone with 2-pentanol, larger gold particles (over 30 nm in diameter) exhibited higher catalytic activity compared to smaller particles (4 nm in size). This is contrary to what is observed with supported monometallic silver catalysts.
Article
Multidisciplinary Sciences
Maciej Zielinski, Zbigniew Kaszkur, Wojciech Juszczyk, Janusz Sobczak
Summary: With decreasing size of crystals, the surface structure of nanocrystalline materials, such as nanocrystalline gold supported on ceria, becomes important and affects the powder diffraction pattern. This study reveals the changes in background pattern, peak positions, and Au peak intensity, and suggests a multiply twinned structure of gold and high mobility of Au atoms on the surface of ceria. The results also show reversible shifts in CeO2 peak positions, indicating internal alternations of the CeO2 crystal structure.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Marek Glinski, Agnieszka Czajka, Urszula Ulkowska, Ewa M. Iwanek (nee Wilczkowska), Dariusz Lomot, Zbigniew Kaszkur
Summary: This study investigates the synthesis of Mg(OH)(2) using magnesium nitrate, chloride, or sulphate, finding that the counter ion strongly influences purity and specific surface area. Factors such as calcination temperature and choice of precipitating agent also play a role in the properties of the obtained MgO.
Review
Chemistry, Physical
Linda Z. Nikoshvili, Boris B. Tikhonov, Pavel E. Ivanov, Polina Y. Stadolnikova, Mikhail G. Sulman, Valentina G. Matveeva
Summary: In recent years, there has been a growing interest in composite materials, particularly organic-inorganic systems, due to their improved properties as adsorbents and heterogeneous catalysts. The large-scale production of environmentally friendly functionalized biopolymers, such as chitosan (CS), has opened up possibilities for the development of new materials, as CS has shown remarkable properties as a stabilizing agent and adsorbent. This review focuses on CS-based materials and composite systems, specifically CS-oxide and CS-metal composites, for their applications as adsorbents and supports for catalytically active metal nanoparticles and enzymes.
Article
Engineering, Chemical
Valentin N. Sapunov, Linda Z. Nikoshvili, Elena S. Bakhvalova, Mikhail G. Sulman, Valentina G. Matveeva
Summary: Palladium nanoparticles and compounds have shown to be effective catalysts for organic synthesis. This study focuses on the preparation and comparison of Pd(0) or Pd(II) supported/embedded in hyper-cross-linked polystyrene (HPS) for Suzuki cross-coupling reactions. The study also discusses the difference in activity between Pd(0) and Pd(II) catalysts, as well as proposes a mathematical model for the reaction.
Review
Chemistry, Physical
Linda Z. Nikoshvili, Valentina G. Matveeva
Summary: This review discusses the recent progress in Pd-catalyzed tandem processes, focusing on homogeneous and heterogeneous catalysts as well as metal-enzyme catalysts. It covers various types of tandem reactions and their applications in fine organic synthesis and biotechnology.
Article
Chemistry, Multidisciplinary
Ilia Smirnov, Zbigniew Kaszkur, Armin Hoell
Summary: The appearance of twin/stacking faults in nanoparticles affects their catalytic, optical, and electrical properties. However, there is a lack of experimental tools for characterizing these defects numerically, leading to poor understanding of structure-property correlations. In this study, we explored the twinning effect on XRD pattern and developed a new approach based on the mutual orientation of periodic fcc segments. By performing computational simulations, we found a correlation between the number of domains and the height ratio of 220 to 111 diffraction peaks. Our XRD analysis of Au and AuPt samples, compared with TEM and SAXS analyses, demonstrates the potential of our multidomain XRD method in studying structure-property correlations in nanomaterials.