Article
Astronomy & Astrophysics
Alec Paulive, Joshua T. Carder, Eric Herbst
Summary: In the interstellar medium, the formation of complex organic molecules largely depends on surface reactions. However, in cold dark clouds, thermal desorption is inefficient due to the lack of thermal energy. Non-thermal desorption, such as cosmic ray sputtering, is an important explanation for the detection of many organic molecules in the gas phase. Model results suggest that sputtering is an efficient and significant factor that should be considered in future chemical models.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Alec Paulive, Christopher N. Shingledecker, Eric Herbst
Summary: This study examines the abundance of complex organic molecules in interstellar sources, exploring both gas-phase and dust grain production routes as well as the potential role of radiolysis chemistry in cold dark clouds. The findings suggest that radiolysis greatly increases the modeled abundance of certain COMs, impacting their presence in different cloud environments.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
V Wakelam, E. Dartois, M. Chabot, S. Spezzano, D. Navarro-Almaida, J-C Loison, A. Fuente
Summary: The study focuses on gas-phase molecules and atoms being depleted to the surface of interstellar grains under cold conditions, and tests the efficiency of different mechanisms in models. Results show that it is necessary to consider photo-desorption, chemical desorption, and cosmic-ray-induced heating to explain observations by telescopes.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Brandt A. L. Gaches, Thomas G. Bisbas, Shmuel Bialy
Summary: This study investigates the impact of cosmic-ray attenuation on the emission of carbon cycle species in molecular clouds. The findings suggest that constant ionization rate models fail to reproduce the actual situation, highlighting the need for column-dependent cosmic-ray ionization rate prescriptions.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
Jonathan M. C. Rawlings
Summary: The standard model of cosmic ray heating-induced desorption of interstellar ices has been re-evaluated and developed, finding that the desorption rates are significantly larger than previously determined. The dominant contribution to desorption comes from the smallest grains in typical interstellar grain size distributions. The model suggests that if the interval between cosmic ray impacts is shorter than the freeze-out time-scale, the continuous representation is inapplicable.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Arshia M. Jacob, Karl M. Menten, Friedrich Wyrowski, Benjamin Winkel, David A. Neufeld, Baerbel S. Koribalski
Summary: This study reports the detection of ArH+ in two nearby galaxies, NGC 253 and NGC 4945, and the non-detection in Arp 220. The results show that ArH+ resides in gas volumes with low electron densities.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
N. Entekhabi, J. C. Tan, G. Cosentino, C-J Hsu, P. Caselli, C. Walsh, W. Lim, J. D. Henshaw, A. T. Barnes, F. Fontani, I Jimenez-Serra
Summary: This study investigates the astrochemical conditions in different regions of a massive infrared dark cloud (IRDC) by comparing observed abundances of multiple molecules and molecular ions with the predictions of astrochemical models. The results reveal relatively low cosmic ray ionisation rates and relatively old chemical ages in these regions.
ASTRONOMY & ASTROPHYSICS
(2022)
Article
Astronomy & Astrophysics
D. N. Kosenko, S. A. Balashev
Summary: HD molecule is abundant in the Universe and can be used to constrain physical parameters. We detected HD in Magellanic Clouds and attempted to measure cosmic ray ionization rate, but the results were limited due to the quality of the spectra.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ozgun Arslan, Seyit Hocuk, Paola Caselli, Ibrahim Kucuk
Summary: In molecular cloud cores, the sputtering efficiency of H2O and CO ices is predominantly influenced by the quadratic regime of cosmic ray-induced sputtering via CR ion-icy grain collision. The sputtering rate coefficients for these types of ice show variations with respect to the CR ion energy flux and the grain-size-dependent mantle depth. The threshold for latent track formation can be considered as a separator between the linear and quadratic regimes of sputtering.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Carlos Cabezas, Isabel Pena, Jose Cernicharo
Summary: The recent detection of cyanonaphthalenes in interstellar space has sparked interest in exploring other aromatic molecular species that may be present in similar environments. This study focuses on ethynyl derivatives of naphthalene as potential candidates to be observed in the Taurus Molecular Cloud (TMC-1), where cyanonaphthalenes, as well as cyano- and ethynyl-derivatives of cyclopentadiene and benzene, have already been found. The researchers have successfully observed the rotational spectra of 1- and 2-ethynylnaphthalene species for the first time, providing accurate spectroscopic parameters that will aid in future astronomical searches.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
K-J Chuang, G. Fedoseev, C. Scire, G. A. Baratta, C. Jaeger, Th Henning, H. Linnartz, M. E. Palumbo
Summary: This study extends the non-energetic formation scheme of interstellar C2H2:H2O ice and investigates the energetic counterpart induced by cosmic rays through laboratory experiments. The results show that energetic processing at 17K leads to the formation of unsaturated hydrocarbons, polyynes, and cumulenes, as well as oxygen-bearing compounds.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. K. Pavlov, D. Belousov, D. A. Tsurkov, V. N. Lomasov
Summary: This study simulates the accumulation of radicals and the release of energy in ice under high energy radiation and heating, suggesting that this process may be a possible cause of cometary outbursts, which is important for understanding the origin of comets.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Mark R. Krumholz, Roland M. Crocker, Stella S. R. Offner
Summary: Cosmic rays in star-forming galaxies play a dominant role in producing both diffuse gamma-ray emissions and ionization. This study establishes a connection between the cosmic rays and star formation rates, gamma-ray luminosities, and ionization rates in galaxies, providing insight into the maximum ionization rate and gamma-ray luminosity in these systems. The results suggest that ionization rates in the Milky Way may include contributions from local sources or enhanced CR-driven ionization not directly linked to star formation. Additionally, gamma-ray luminosity measurements can be used to constrain galactic ionization budgets in starburst galaxies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
W. R. M. Rocha, P. Woitke, S. Pilling, W. -F. Thi, J. K. Jorgensen, L. E. Kristensen, G. Perotti, I. Kamp
Summary: This study aims to achieve quantitative agreement between laboratory experiments and astrochemical modelling of UV photolysis of methanol ice. The results show that the destruction of methanol ice via UV photodissociation can be reproduced at different temperatures by adjusting surface chemistry parameters. It is also found that the branching ratios and reactive desorption mechanisms have a significant impact on the results.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Bilel Mehnen, Ignacio Suarez Martin, Evelyne Roueff, Majdi Hochlaf, Gunnar Nyman
Summary: Based on ab initio electronic structure data, parametrized analytic potential energy surfaces for HCN and HNC isomers are developed by variationally calculating rovibrational energy levels and adjusting potential parameters. An analytic expression is determined to effortlessly calculate the rovibrational energy levels. The obtained empirical potentials are used to calculate rovibrational levels for multiple isotopologues, and the accuracy is estimated based on comparison with experimental results. Molecular parameters and endo- and exoergicities for isotopic exchange reactions are also given.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Druval Santos de Sa, Elton Jorge da Rocha Rodrigues, Natasha Midori Suguihiro, Amanda Garcez da Veiga, Sidnei Paciornik, Alessandro Massi, Omar Ginoble Pandoli
Summary: This study demonstrates a one-pot synthesis of copper nanoparticles mediated by carboxymethylcellulose in water, and their heterocatalytic activity on lignocellulosic bamboo slices. The formation of CuNPs is monitored in real-time by time-domain NMR under different temperature and concentration conditions. 1,4-disubstituted 1,2,3-triazoles were successfully synthesized in both organic and aqueous solutions at 70 degrees C. The CuNPs-BSs show excellent reuse performance with minimal leaching of the copper nanocatalyst.
Review
Chemistry, Multidisciplinary
Rajangam Vinodh, Rajendran Suresh Babu, Sangaraju Sambasivam, Chandu V. V. Muralee Gopi, Salem Alzahmi, Hee-Je Kim, Ana Lucia Ferreira de Barros, Ihab M. Obaidat
Summary: Supercapacitors, with their excellent capacitance and rate efficiency, extended durability, and cheap materials price, are regarded as one of the most promising energy storage devices. The choice of electrode materials is critical for the performance of supercapacitors. The combination of polyaniline (PANI) and metal-organic frameworks (MOFs) as electrode materials shows additional benefits and is predicted to be the next-generation electrode materials for efficient supercapacitors.
Article
Physics, Multidisciplinary
Tahir, Omar Ginoble Pandoli, Quaid Zaman, Guilherme C. Concas, Mariana Gisbert, Marco Cremona, Fernando Lazaro Freire Jr, Isabel C. S. Carvalho, Pedro H. C. Bevilaqua, Druval Santos de Sa, Alexandre Pinto Canellas, Vinicius Mattoso, Tommaso Del Rosso
Summary: This study demonstrates that ns-pulsed laser ablation (PLA) in water can be a safe, effective, and green method for regenerating clogged microfluidic reactors. The experimental results reveal that ablation is mainly caused by delamination and thermoelastic force at low fluence, while thermal processes inducing phase conversion dominate at high fluence. Using a thermoelastic PLA setup, glass microfluidic devices were successfully unclogged, and the efficiency and time required for complete removal of silver nanomaterial were comparable to acidic treatment.
JOURNAL OF PHYSICS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Quaid Zaman, Tahir, Fernando Lazaro Freire, Ivan Shtepliuk, Andre N. Barbosa, Marcelo E. H. Maia da Costa, Cesar Augusto Diaz Mendoza, Jefferson F. D. F. Araujo, Guilherme C. Concas, Marco Cremona, Zubair Ahmed, Omar Ginoble Pandoli, Ricardo Q. Aucelio, Victor Dmitriev, Karlo Q. da Costa, Andre Felipe S. Cruz, Gabriella Fibbi, Anna Laurenzana, Francesca Margheri, Anastasia Chilla, Francesca Scavone, Elena Frediani, Rajwali Khan, Nicola Daldosso, Elena Chiste, Gino Mariotto, Evelyn C. S. Santos, Tommaso Del Rosso
Summary: This study investigates the effects of water diffusion at different interfaces of gold-graphene plasmonic sensors on the propagation of surface plasmon polaritons. Experimental results show that water molecules can still diffuse into the plasmonic sensors through the borders of graphene domains, despite the protection provided by graphene. The study also proposes a simplified effective medium approach to describe the interactions between heterogeneous metal-carbon interfaces.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Inorganic & Nuclear
Narasimharao Kitchamsetti, D. Narsimulu, Ashok Chinthakuntla, Chidurala Shilpa Chakra, Ana L. F. de Barros
Summary: In this study, ZnCo2O4 nanocages were synthesized using MOF as a template and their photocatalytic performance for the removal of organic pollutants was investigated. The results show that ZnCo2O4 nanocages exhibit remarkable photocatalytic activity for different dye pollutants and have good stability and recyclability.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
B. C. Ferreira, R. Suresh Babu, L. R. B. da Conceicao, H. O. da Cunha, D. M. Sampaio, L. M. Samyn, A. L. F. de Barros
Summary: In this study, natural dyes extracted from the petals of Lantana repens and Solidago canadensis flowers were used to construct dye-sensitized solar cells (DSSCs). The optical, morphological, and surface properties of the extracted dyes were analyzed. The results showed that natural dyes as photosensitizers have certain effects and can potentially be used in large-scale production.
Article
Engineering, Electrical & Electronic
F. M. M. dos Santos, A. M. B. Leite, L. R. B. da Conceicao, Y. Sasikumar, R. Atchudan, M. F. Pinto, R. Suresh Babu, A. L. F. de Barros
Summary: This study prepared a novel dye-sensitized solar cell (DSSC) using natural dyes extracted from Gerbera jamesonii flowers. The characteristics of the extracted dyes were analyzed using UV-Vis spectroscopy and FTIR spectroscopy, while the surface morphology of the photoanodes and photocathodes were examined using AFM and FESEM. The photovoltaic performances of the DSSCs were evaluated, showing that the extracted dyes significantly increased the efficiency of the solar cells.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Chemical
M. Mabaya, R. A. A. Aguiar, H. R. M. Costa, A. L. F. de Barros, J. M. L. Reis, J. P. B. Souza
Summary: Polymeric nanocomposites consisting of organic matrix and inorganic nanoparticles combine the advantages of polymers, such as lightweight and moldability, with the excellent mechanical, thermal, and electrical properties of nanofillers. The addition of nanoparticles has been widely used to enhance mechanical or thermal properties and develop new materials. To improve the bonding properties of adhesive joints, researchers have developed hybrid welding technologies. This paper aims to develop a conductive structural adhesive by adding nanoparticles to the established adhesive, with multiwalled carbon nanotubes showing the best results when added at a concentration of 1.5%.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2023)
Article
Spectroscopy
A. M. B. Leite, H. O. da Cunha, A. F. C. R. Rodrigues, R. Suresh Babu, A. L. F. de Barros
Summary: In this study, natural dyes containing anthocyanin were extracted from three different species of the Chrysanthemum flower family and used as photosensitizers for constructing dye-sensitized solar cells (DSSCs). The performance and efficiency of the solar cells were evaluated, and it was found that the Chrysanthemum Violet (CV) cell had the highest photovoltaic conversion efficiency and open circuit voltage. This suggests that organic solar cells are a viable option for electric energy generation.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Narasimharao Kitchamsetti, Chidurala Shilpa Chakra, Ana Lucia Ferreira De Barros, Daewon Kim
Summary: The preparation of metal organic frameworks (MOFs) has gained attention due to their exceptional properties. In this study, Ag-MOF nanosheets were synthesized using a solvothermal assisted route and applied as a photocatalyst for the removal of different organic pollutants. Various characterization techniques were used to analyze the composition, optical properties, morphology, and microstructure of the AMOF nanosheets. The results showed that the AMOF nanosheets exhibited significant photocatalytic activity for the degradation of dye pollutants.
Article
Materials Science, Paper & Wood
Elton Jorge da Rocha Rodrigues, Roberto Pinto Cucinelli Neto, Haimon Diniz Lopes Alves, Sidnei Paciornik, Druval Santos de Sa, Khosrow Ghavami, Omar Ginoble Pandoli
Summary: Bamboo is a material with hierarchical structures that allow efficient flow of water and nutrients, enabling fast growth. Its hollow microstructure channels can be utilized for microfluidics applications. This study used X-ray microtomography and proton time-domain NMR to investigate fluid behavior in bamboo tissues. Results showed different fluid reservoirs and varying wettability of bamboo tissues by different fluids.
Article
Chemistry, Physical
Layne O. L. Gontijo, Mario N. Barbosa Junior, Druval Santos de Sa, Sonia Letichevsky, Marlin J. Pedrozo-Penafiel, Ricardo Q. Aucelio, Ivani S. Bott, Haimon Diniz Lopes Alves, Benjamin Fragneaud, Indhira Oliveira Maciel, Andre Linhares Rossi, Letizia Savio, Giovanni Carraro, Dosen Anja, Fernando Lazaro Freire Jr, Ghavami Khosrow, Sidnei Paciornik, Omar Ginoble Pandoli
Summary: This study reports the fabrication of bamboo-based graphitic devices with thermoelectric and electrochemical properties through a low heat thermal treatment. The results demonstrate that bamboo exhibits excellent conductivity at specific temperatures, making it suitable for applications as a working electrode and microfluidic heater.
Article
Optics
A. L. F. de Barros, A. Bergantini, E. F. da Silveira, S. D. Tozetti, H. Rothard, P. Boduch, A. Domaracka
Summary: This article investigates the radiolysis of a mixture of nitric acid and water at low temperature and high vacuum conditions. The experiments showed the formation of various N-O bearing species after irradiation and provided spectroscopic data for future studies in theoretical, laboratory, and observational settings.
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
(2023)
Article
Biology
Lorraine Martins Rocha Orlando, Leonardo da Silva Lara, Guilherme Curty Lechuga, Giseli Capaci Rodrigues, Omar Ginoble Pandoli, Druval Santos de Sa, Mirian Claudia de Souza Pereira
Summary: Therapeutic alternatives for Chagas disease are urgently needed due to limitations and adverse effects of current drugs. Triazole analogues show promise in treating T. cruzi.
Article
Materials Science, Multidisciplinary
L. M. Samyn, T. S. Lessa, R. Suresh Babu, A. Kalaivani, T. M. Barbosa, A. L. F. de Barros
Summary: In this study, three-dimensional open-framework tunnels based on inorganic metal coordination compounds were successfully synthesized using the co-precipitation method. The prepared nanostructured material, PNHCF-NPs, was characterized using various techniques. PNHCF-NPs were coated on carbon cloth to form PNHCF-NPs@CC and its electrochemical properties were evaluated. The hybrid material exhibited high capacitance, excellent rate performance, and outstanding cyclic stability, making it a promising flexible electrode material for high-performance supercapacitors.
MATERIALS ADVANCES
(2023)