Article
Physics, Applied
Hieu Duy Nguyen, Toru Sasaki, Chu Minh Ngo, Yoshinori Tokoi, Thi-Mai-Dung Do, Tadachika Nakayama, Hisayuki Suematsu, Koichi Niihara
Summary: By revisiting the equation to determine the sizes of nanoparticles prepared by pulsed wire discharge (PWD), this study successfully predicted the sizes of Mg particles and complemented a previously proposed equation. Through experimental verification, the feasibility of the revisited equation was confirmed for different nanoparticles prepared by PWD.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
P. Samadi, I. A. Witonska
Summary: To reduce the environmental impact of production processes, metallic supported catalysts (MSCs) can modify wastes. One technique for preparing supports for MSCs is Plasma Electrolytic Oxidation (PEO) process, which creates a uniform, adhesive, and porous layer on metal surfaces, including titanium as the carrier for catalysts. This enables the production of more diverse products with various shapes and mechanical properties compared to ceramic based catalysts. This review presents the application of the PEO process in MSCs production.
CATALYSIS COMMUNICATIONS
(2023)
Article
Environmental Sciences
Muhammad Aamir Manzoor, Iftikhar Hussain Shah, Irfan Ali Sabir, Ajaz Ahmad, Gadah Albasher, Afzal Ahmed Dar, Muhammad Ahsan Altaf, Awais Shakoor
Summary: This study investigated the pathogenic activities of green synthesized copper oxide nanoparticles (CuONPs) against phytopathogens. The CuONPs showed significant antimicrobial and antioxidant activities, which can have a crucial impact on plant pathology against various phytopathogens.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Inorganic & Nuclear
Tahereh Shahraki, Mohammad Reza Naroui Rad, Hamid Reza Ganjali, Hossein Kamaladini, Hamid Reza Mobaser
Summary: In this research, melon extract was used as a natural fuel to synthesize Ag, La2CO5, and ZnO nanoparticles. These nanoparticles exhibited excellent performance in catalytic, antioxidant, and anticancer applications.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Dandan Liu, Shengtai Hou, Yuan Shu, Jiahua Zhao, Li Wang, Pengfei Zhang
Summary: The mechanochemical method proposed in this study can fabricate porous copper molybdate with a high specific surface area, leading to improved catalytic performance compared to traditional methods. The obtained CuxMo1-xOy catalyst exhibited good performance in Knoevenagel condensation reactions.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Review
Chemistry, Inorganic & Nuclear
Mehran Alavi, Masoud Moradi
Summary: Bio-fabrication of silver, copper, and copper oxide nanoparticles and nanocomposites using medicinal plant species and bacteria may provide a novel alternative strategy to combat multidrug-resistant bacteria. This literature review discusses recent studies and challenges related to the antibacterial and photocatalytic capacities of biosynthesized silver and copper nanoparticles and nanocomposites from two sources. The antibacterial activity and mechanisms, as well as the photodegradation process, are important factors to consider in future investigations.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Spectroscopy
E. Proniewicz
Summary: This work discusses the synthesis and characterization of biologically important nanostructures of metals (AgNPs, AuNPs, and PtNPs) and metal oxides (Cu2ONPs, CuONSs, gamma-Fe2O3NPs, ZnONPs, ZnONPs-GS, anatase-TiO2NPs, and rutile-TiO2NPs). The adsorption of a peptide (bombesin, BN) onto these nanostructures and its influence on peptide geometry and biological activity were studied using surface-enhanced Raman scattering spectroscopy (SERS). The SERS enhancement factor was determined for each metallic surface.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Thermodynamics
J. Sathish Kumar, G. Senthilkumar, S. Ramachandran
Summary: The research aims to address the issue of poor thermal conductivity caused by the spherical form of CuO nanoparticles by using polyhedral-shaped MgO nanoparticles. The study introduces a novel approach of adding MgO nanoparticles to improve thermal conductivity and provides experimental data to support this strategy.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Chemistry, Physical
Lindelani Ndlovu, David Lokhat, Deresh Ramjugernath
Summary: This study investigated the partial oxidation of hexafluoropropene over CuO catalyst using molecular oxygen. The catalysts were characterized, and the results confirmed the structure-reactivity correlation. The major products were hexafluoropropene oxide (HFPO) and carbonyl fluoride, with minor trifluoroacetyl fluoride produced when the catalyst had significantly declined in primary activity. The proposed redox mechanism kinetic model was in adequate agreement with the experimental data.
CATALYSIS COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Devi Govindaraj, Buvaneswari Gopal
Summary: N-Arylacetamides such as acetaminophen play a crucial role in medicinal chemistry. This study explored the catalytic effect of metallic copper and supported copper systems on the reductive acetylation of nitroarenes. Cu/SiO2 was identified as an efficient catalyst.
RESEARCH ON CHEMICAL INTERMEDIATES
(2022)
Article
Optics
Sarah Morais Bezerra, Viktoria Levchenko, Fabio Piccinelli, Marco Bettinelli, Ricardo Luiz Longo, Oscar Loureiro Malta, Renata Reisfeld
Summary: A theoretical model based on rate equations and energy transfer rates was developed to explain a threefold increase in the photoluminescence of a Eu(III)-pyridine complex in the presence of copper nanoparticles (CuNPs). The model was modified and generalized to describe the interactions between copper oxide nanoparticles (CuONPs) and the Eu(III) complex, as well as simultaneous interactions of CuNPs and CuONPs with the Eu(III) complex.
JOURNAL OF LUMINESCENCE
(2022)
Article
Multidisciplinary Sciences
Sadaf Raza, Asma Ansari, Nadir Naveed Siddiqui, Fariha Ibrahim, Muhammad Ishaque Abro, Afsheen Aman
Summary: This study utilized a biologically mediated approach to synthesize silver nanoparticles and silver-chitosan nanocomposites, characterizing them through various spectroscopic analyses and demonstrating their promising antimicrobial potential. The silver-chitosan nanocomposites exhibited synergistic behavior against various bacterial species and showed no cytotoxic effects on NIH/3T3 cell lines.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Inorganic & Nuclear
Sahil Kohli, Garima Rathee, Sunita Hooda, Ramesh Chandra
Summary: This study focuses on the synthesis of an efficient, reusable, and novel Al2O3/CuI/PANI nanocatalyst using a simple self-assembly approach, which was then used for the catalytic one-pot synthesis of 2-substituted benzimidazoles in ethanol. The nanocatalyst showed high % yield, short reaction time, and green metrics values.
DALTON TRANSACTIONS
(2021)
Article
Energy & Fuels
Shir Reen Chia, Mushtaq Ahmad, Shazia Sultana, Muhammad Zafar, Saira Asif, Awais Bokhari, Saifuddin Nomanbhay, Muhammad Mubashir, Kuan Shiong Khoo, Pau Loke Show, Pau Loke Rozina
Summary: The study investigated the potential of Citrus medica as a novel and non-edible seed oil producing feedstock for biodiesel production, using green and recyclable nanoparticles of copper oxide as catalyst.
Review
Chemistry, Multidisciplinary
Ubong J. Etim, Chenchen Zhang, Ziyi Zhong
Summary: CO2 activation requires active sites on catalyst surfaces, with oxygen vacancies or defect sites playing a significant role in promoting CO2 transformation reactions.
Article
Chemistry, Multidisciplinary
Anindita Dewan, Manashi Sarmah, Pankaj Bharali, Ashim J. Thakur, Purna K. Boruah, Manash R. Das, Utpal Bora
Summary: The distorted honeycomb-like hollow cage-structured bio-nanocellulose, derived from cellulosic waste of pomegranate peel using a simple microwave technique, can be loaded with Pd nanoparticles and utilized as an efficient heterogeneous catalyst for the synthesis of potential bioactive derivatives via cross-coupling reactions. The catalyst is reusable up to five catalytic cycles without significant loss of its activity.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Chiranjita Goswami, Himadri Saikia, Biraj Jyoti Borah, Manash Jyoti Kalita, Kohei Tada, Shingo Tanaka, Pankaj Bharali
Summary: This study reported the remarkable electrocatalytic performance of carbon-supported bimetallic Pd-Cu alloy nanoparticles towards formic acid oxidation and oxygen reduction reaction, with Pd3Cu/C alloy NPs exhibiting the best activity.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Kumar Kashyap Hazarika, Yusuke Yamada, Ekaterina V. Matus, Mikhail Kerzhentsev, Pankaj Bharali
Summary: The transition metal oxide based electrocatalyst with mixed valence state exhibits high activity and stability, showing promising potential for oxygen electrocatalysis.
JOURNAL OF POWER SOURCES
(2021)
Article
Energy & Fuels
Biraj Jyoti Borah, Chiranjita Goswami, Yusuke Yamada, Kohei Tada, Shingo Tanaka, Pankaj Bharali
Summary: In this study, a novel Pd2CuCo/C hybrid electrocatalyst with nanoflower morphology was successfully developed, demonstrating superior electrocatalytic performance towards the oxygen reduction reaction. The electrode showed highly open hierarchical nanostructures with preferentially exposed crystal planes and multiple surface defects, offering high stability and fast electron transfer during fuel cell operation. The intricate synergy between Pd, Cu, and Co in the alloy NF, along with the strong interaction with the carbon matrix, contributed to the remarkable electrocatalytic activity.
Article
Energy & Fuels
Chiranjita Goswami, Kumar Kashyap Hazarika, Yusuke Yamada, Pankaj Bharali
Summary: A nonprecious mixed MO hybrid, Co3O4-CeO2/C, shows high activity in the oxygen reduction reaction and oxygen evolution reaction, with the potential to replace noble metals and develop low-cost bifunctional electrodes for energy devices.
Review
Chemistry, Physical
Suranjana Patowary, Rashmi Chetry, Chiranjita Goswami, Bhugendra Chutia, Pankaj Bharali
Summary: This article primarily documents the recent advancements and challenges of supported nanomaterials with fascinating properties towards oxygen reduction reaction (ORR). The use of carbon-based materials as support and the significant factors affecting ORR activity are discussed, along with the electrochemical techniques and parameters used for data collection and evaluation.
Article
Chemistry, Multidisciplinary
Anindita Dewan, Manashi Sarmah, Prantika Bhattacharjee, Pankaj Bharali, Ashim J. Thakur, Utpal Bora
Summary: This study reports the design, synthesis, and application of naturally occurring cellulose from agro waste pomegranate peel as a novel support for active biogenic Pd nanoparticles for Suzuki-Miyaura and Sonogashira cross-coupling reactions at room temperature. The cellulose matrix enables well dispersion of Pd nanoparticles over the support to generate Pd@cellulose, exhibiting excellent catalytic activity and recyclability under ligand-free mild reaction conditions. The synthesized cellulose nanofibers and Pd-anchored heterogeneous nanofibers were characterized through various analytical techniques.
SUSTAINABLE CHEMISTRY AND PHARMACY
(2021)
Article
Chemistry, Physical
Bhugendra Chutia, Pankaj Bharali
Summary: We report the fabrication of a non-precious Fe2O3-CeO2/C electrocatalyst with a rich interfacial structure for the oxygen reduction reaction in alkaline electrolyte. The unique redox property of this catalyst gives it notable catalytic performance and stability, making it a promising candidate for oxygen reduction reaction.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Manashi Sarmah, Debasish Sarmah, Anindita Dewan, Porag Bora, Purna K. Boruah, Manash R. Das, Pankaj Bharali, Utpal Bora
Summary: The Cu2O/Cu nanocatalyst was synthesized via a simple method using papaya peel extract, and it exhibited efficient catalytic activity in Pd-free Sonogashira and Chan-Lam cross-coupling reactions. Characterization techniques such as XRD and XPS confirmed the structure and formation of the catalyst.
Article
Energy & Fuels
Bhugendra Chutia, Suranjana Patowary, Ashok Misra, Komateedi N. Rao, Pankaj Bharali
Summary: We report a controllable synthesis of Co3O4 nanooctahedron anchored on Vulcan XC 72R (Oct-Co3O4/C) for the bifunctional electrocatalysis of oxygen reduction and oxygen evolution reaction (ORR/OER) in alkaline electrolyte. The Oct-Co3O4/C exhibits remarkable activity, stability, and durability, which can be attributed to the crystal symmetry effects, high specific surface area, and rich oxygen vacancies in the octahedral structure.
Article
Electrochemistry
Kumar K. Hazarika, Bhugendra Chutia, Rabu R. Changmai, Purna K. Boruah, Manash R. Das, Pankaj Bharali
Summary: In this study, nanohybrids of various Fe-Co oxides anchored on to carbon matrix were systematically investigated for high-performing oxygen electrode reactions. Among them, Fe2.1Co0.9O4/C NH exhibited superior oxygen reduction reaction (ORR) performance compared to other compositions and benchmark Pt/C. Additionally, the Co3+ rich Fe0.9Co2.1O4/C NH demonstrated excellent oxygen evolution reaction (OER) performance. These electrocatalysts with bimetallic active sites and carbon matrix showed unique electrocatalytic properties, making them significant candidates for oxygen electrocatalysis.
Article
Chemistry, Physical
Ekaterina Matus, Olga Sukhova, Mikhail Kerzhentsev, Ilyas Ismagilov, Svetlana Yashnik, Vladimir Ushakov, Olga Stonkus, Evgeny Gerasimov, Andrey Nikitin, Pankaj Bharali, Zinfer Ismagilov
Summary: This study investigates hydrogen production through the bi-reforming of methane over exsolution-derived Ni catalysts. The performance and resistance to coking of the nickel-based catalysts are influenced by adjustments to the composition of the oxide matrix, which control their textural, structural, morphological, and redox properties. The preferred M-type and M/Ce ratio are crucial in determining the best performance of the catalysts.
Article
Energy & Fuels
Rashmi Chetry, Bhugendra Chutia, Suranjana Patowary, Biraj Jyoti Borah, Putla Sudarsanam, Pankaj Bharali
Summary: In this study, a homogeneously embedded Pd2CuCo alloy in the carbon matrix was synthesized. The as-synthesized Pd alloy electrocatalyst exhibited an improved limiting current density, a smaller Tafel slope, and a comparable onset potential compared to Pt/C. Moreover, the Pd2CuCo alloy electrocatalyst also demonstrated excellent methanol tolerance, higher activity, and long-term stability toward the formic acid oxidation reaction compared to Pd/C.
Article
Chemistry, Physical
Chiranjita Goswami, Biraj Jyoti Borah, Ruprekha Das, Kohei Tada, Shingo Tanaka, Igor P. Prosvirin, Ilyas Z. Ismagilov, Ekaterina Matus, Mikhail Kerzhentsev, Pankaj Bharali
Summary: Engineering metal/oxide interface and controlling composition are important strategies for efficient Pd-based electrocatalysts. In this study, Pd3M alloy nano-particles anchored on C-CeO2 (Pd3M/C-CeO2, M = Cu, Ni, Co) demonstrated significant performance in formic acid oxidation. The improved activity can be attributed to the electronic and synergistic effects between Pd and the alloyed metal, resulting in lattice contraction and downshift of d-band center. The presence of oxygen vacancies in CeO2 and strong Pd/CeO2 interactions also contribute to the overall electrocatalytic behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Pangkita Deka, Ramesh Chandra Deka, Pankaj Bharali
Summary: A two-step strategy was used to synthesize three different mesoporous CuO nanocatalysts for the oxidative degradation of persistent organic water pollutants. The CuO nanocatalysts showed varied activity depending on synthesis parameters and textural properties, with higher reaction rates observed at increased temperatures. CuO synthesized from Cu(NO3)(2)center dot 3H(2)O exhibited higher catalytic activity compared to other precursors and showed good recyclability for five successive cycles.
INTERNATIONAL JOURNAL OF NANOTECHNOLOGY
(2021)