Ivan Padron‐Ramirez

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

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Manuel Antuch

University of Trieste

Angel Luis Corcho‐Valdés

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

Luis Felipe Desdin García

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

Frank J. Chao‐Mujica

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

Josue Ponce de Leon-Cabrera

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

J Cabrera

Alejandro Gutiérrez‐Quintanilla

Institut des Sciences Moléculaires d'Orsay

Carlos Rosendo Arganis-Juárez

Instituto Nacional de Investigaciones Nucleares

Marina Perez Cruz

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

Jimena Catalina Viteri Ojeda

Higher Institute of Technologies and Applied Sciences

Cooperative Institutions

University of Havana

Centro de Aplicaciones Tecnológicas y Desarrollo Nuclear

Universiti Putra Malaysia

King Abdulaziz University

East Asia School of Theology

Université Paris-Saclay

Higher Institute of Technologies and Applied Sciences

Centre National de la Recherche Scientifique

Instituto Nacional de Investigaciones Nucleares

A. N. Nesmeyanov Institute of Organoelement Compounds

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Detailed yield assessment of carbon nanostructures synthesized by submerged arc discharge in water

Advances in Natural Sciences Nanoscience and Nanotechnology (2024)

Frank J. Chao‐Mujica Angel Luis Corcho‐Valdés Ivan Padron‐Ramirez J Cabrera Lorenzo Hernández-Tabares

Abstract Submerged arc discharge in water (SADW) is one of the most effective methods for the synthesis of high-quality carbon nanostructures (CNSs). Despite the numerous published studies on SADW, systematic data on yield is still lacking. The SADW runs as a succession of stable and unstable zones, but the influence of these zones on its yield has not yet been explored. The CNSs were synthesised in a SADW facility with a micro-positioning system controlled by current feedback, stabilisation via ballast resistance, and data recorded by a five-parameter correlated measurement system. The synthesis products were characterised by x-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) adsorption isotherms. In this study, an approach is presented to determine the SADW yield by analysing the correlation between the process parameters recorded with the experimental setup and gravimetric measurements. In the work, the relationship between the formation of the different CNSs and the stable and unstable zones is discussed. The yield was determined at a current of 30 A, which is considered the optimal current for CNSs synthesis, and the estimation obtained indicates that it is in the range of 1%–1.3%. The energy consumption to produce CNSs was assessed to be around 80 kJ.mg −1 . The results obtained contribute to clarifying some of the factors that influence yield and how to optimise it. This work provides a useful reference point for future work associated with CNS synthesis using SADW.

Electric arc

Carbon fibers

10.1088/2043-6262/ad2dc5

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Methane and carbon dioxide adsorption on carbon nano-onions synthesized by the submerged arc-discharge method

Adsorption (2023)

Ivan Padron‐Ramirez Neil Torres-Figueredo Angel Luis Corcho‐Valdés Josue Ponce de Leon-Cabrera Frank J. Chao‐Mujica

Carbon fibers

10.1007/s10450-023-00432-9

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Precise Fingerprint Determination of Vibrational Infrared Spectra in a Series of Co(II) Clathrochelates through Experimental and Theoretical Analyses

The Journal of Physical Chemistry A (2023)

Angel Luis Corcho‐Valdés Josue Ponce de Leon-Cabrera Ivan Padron‐Ramirez Frank J. Chao‐Mujica Ekaterina G. Lebed

The energetic demands of modern society for clean energy vectors, such as H2, have caused a surge in research associated with homogeneous and immobilized electrocatalysts that may replace Pt. In particular, clathrochelates have shown excellent electrocatalytic properties for the hydrogen evolution reaction (HER). However, the actual mechanism for the HER catalyzed by these d-metal complexes remains an open debate, which may be addressed via Operando spectroelectrochemistry. The prediction of electrochemical properties via density functional theory (DFT) needs access to thermodynamic functions, which are only available after Hessian calculations. Unfortunately, there is a notable lack in the current literature regarding the precise evaluation of vibrational spectra of such complexes, given their structural complexity and the associated tangled IR spectra. In this work, we have performed a detailed theoretical and experimental analysis in a family of Co(II) clathrochelates, in order to establish univocally their IR pattern, and also the calculation methodology that is adequate for such predictions. In summary, we have observed the presence of multiple common bands shared by this clathrochelate family, using the B3LYP functional, the LANL2DZ basis, and effective core potentials (ECP) for heavy atoms. The most important issue addressed in this article was therefore related to the detailed assignment of the fingerprint associated with cobalt(II) clathrochelates, which is a challenging endeavor due to the crowded nature of their spectra.

Hessian matrix

10.1021/acs.jpca.3c04161

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The Promise of Carbon Nano‐Onions: Preparation, Characterization and Their Application in Electrochemical Sensing

Analysis & Sensing (2024)

Hector Daniel Almeida Gonzalez Jimena Catalina Viteri Ojeda Angel Luis Corcho‐Valdés Ivan Padron‐Ramirez Marina Perez Cruz

Abstract Carbon nano‐onions (CNOs) promise to improve the range of applications of carbon materials for electroanalytical applications. In this review, we explore the synthesis, characterization, and electrochemical applications of CNOs. CNO‐based sensors present impressive features, including low detection limits in the femtogram per milliliter range, a broad linear detection range spanning up to 7 orders of magnitude, exceptional selectivity, reproducibility, and stability. Synthetic methods and characterization techniques for CNOs were thoroughly examined, shedding light on their pivotal role in biosensing technologies. Comparative analyses with other carbon materials underscore CNOs′ competitive performance, either surpassing or matching many counterparts. Despite their relatively recent integration in biosensing applications, CNOs exhibit comparable or superior results concerning other carbon‐based materials. Indeed, the incorporation of CNOs into hybrid nanocomposites has shown promising outcomes, indicating a synergistic potential for future advancements in biosensing technologies. Our review provides a broad approach to the application of CNOs to the field, with emphasis on breakthroughs of the last 5 years.

Characterization

Carbon fibers

10.1002/anse.202400035

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Exploring the use of fast electron backscattering for the determination of the C/O ratios: possible applications to graphene oxide and reduced graphene oxide

Advances in Natural Sciences Nanoscience and Nanotechnology (2024)

Ivan Padron‐Ramirez Frank J. Chao‐Mujica Ángeles Díaz Sánchez Carlos Rosendo Arganis-Juárez Pamela F Nelson

Abstract GO and rGO are carbon nanostructures with a wide range of applications. The carbon/oxygen ratio (C/O) is a basic parameter that determines many of its essential properties. The large-scale production of these materials requires the use of fast and representative methods to determine the C/O ratio. In the present work, the feasibility of using fast electron backscattering to determine this relationship was explored. The method is rapid and does not require previous sample treatment, its accuracy is approximately 11%–15% for C/O ∼ 10–35 and its precision is around 0.4%. It was estimated that the backscattered electrons being detected came from a sample mass of 0.04–0.4 g, depending on the synthesis method used. The accuracy of the backscatter method is approximately equal to that of EDX and XPS, but it surpasses them in precision and representativeness. Backscattering equipments are more economical when compared to the above-mentioned techniques; however, it can be affected by the presence of impurities. Therefore, we consider it an appropriate method for the large-scale control of samples of GO and rGO produced by a given technology and calibrated with a rigorous elemental analysis.

10.1088/2043-6262/ad6cc1

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