A Polymer‐Based Electrochemical DNA Biosensor for Salmonella: Preparation, Characterization and Calibration Madeline Díaz‐Serrano Arelys Rosado Joselyn Del Pilar Melvin Arias Polanco Ana R. Guadalupe Dispersity Calibration curve Bifunctional Polymer Detection limit Polymerization Oligonucleotide Polystyrene Electrochemistry Glassy carbon Cyclic voltammetry Materials science Radical polymerization Biosensor Polymer chemistry Electrode Chemistry Nanotechnology Organic chemistry Chromatography Abstract In this paper, we present the results of the use of bifunctional polymeric films of polystyrene (10.3 KD–49.5 KD) to anchor oligo sequences of various lengths (15, 35 and 70‐mer). The polymers were prepared by radical polymerization with 4,4′‐azobis(4‐cyanovaleric acid) as initiator and 3‐Carboxy PROXYL to control the molecular weight and polydispersity. They were further modified with N‐hydroxysuccinimide to anchor the (5′‐AmMC12) oligos. The anchoring reaction was done on a polymer‐modified glassy carbon electrode. The probes were hybridized with their ferrocene‐labeled complementary sequences. The hybridization reaction was followed by Osteryoung square wave voltammetry (OSWV). The calibration curve showed a narrow and sharp linear range between (5.7–8.0)×10−7 M and a detection limit around 0.55 µM. 2011 en info:eu-repo/semantics/article journal-article https://doi.org/10.1002/elan.201000698 Electroanalysis Electroanalysis urn:issn:1040-0397 urn:issn:1521-4109 Electroanalysis, 2011, vol. 23, n. 8, p. 1830-1841 info:eu-repo/semantics/closedAccess closedAccess Q1 Clean water and sanitation Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Parametrizing Clifford Algebras’ Matrix Generators with Euler Angles Manuel Beato Vásquez Melvin Arias Polanco Clifford algebra Mathematics Euler's formula Pure mathematics Algebra over a field Matrix (chemical analysis) Classification of Clifford algebras Mathematical analysis Non-associative algebra Algebra representation Chemistry 2024 en info:eu-repo/semantics/article journal-article https://doi.org/10.1007/s00006-024-01353-8 Advances in Applied Clifford Algebras Advances in Applied Clifford Algebras urn:issn:0188-7009 urn:issn:1661-4909 Advances in Applied Clifford Algebras, 2024, vol. 34, n. 5 info:eu-repo/semantics/closedAccess closedAccess Q2 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Interaction of paracetamol and 125I-paracetamol with surface groups of activated carbon: theoretical and experimental study Daniel Hernández-Valdés Carlos Enriquez-Victorero Luis Pizarro-Lou David Turiño-Pérez Luis Ducat-Pagés Melvin Arias Ulises Jáuregui-Haza paracetamol activated carbon adsorption surface functional groups water remediation adsorption isotherms radiolabeling pharmaceutical pollutants 2015 en info:eu-repo/semantics/article journal-article https://doi.org/10.1007/s10967-015-4022-8 Journal of Radioanalytical and Nuclear Chemistry Journal of Radioanalytical and Nuclear Chemistry urn:issn:0236-5731 urn:issn:1588-2780 Journal of Radioanalytical and Nuclear Chemistry, 2015, vol. 305, n. 2, p. 609-622 info:eu-repo/semantics/closedAccess closedAccess Q2 Good health and well-being Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Evidence of massless Dirac fermions in graphitic shells encapsulating hollow iron microparticles Andrea Scarcello Francesca Alessandro Melvin Arias Polanco Cristian Vacacela Gómez Denia Cid Perez Giorgio De Luca Efrem Curcio Lorenzo S. Caputi Raman spectroscopy Graphene Graphite Materials science Dirac fermion Condensed matter physics Nanotechnology Physics Optics Composite material 2021 en info:eu-repo/semantics/article journal-article https://doi.org/10.1016/j.apsusc.2021.149103 Applied Surface Science Applied Surface Science urn:issn:0169-4332 urn:issn:1873-5584 Applied Surface Science, 2021, vol. 546, p. 149103 info:eu-repo/semantics/closedAccess closedAccess Q1 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal An eco-friendly bandgap engineering of semiconductor graphene oxide Yolenny Cruz Salazar Stefano Bellucci Marco Guevara Cristian Vacacela Gómez Ivan Caicedo Jorge Buñay S. López Diego Mayorga Andrea Scarcello Melvin Arias Polanco Salvatore Straface Talía Tene Lorenzo S. Caputi Graphene Oxide Semiconductor Band gap Materials science Raman spectroscopy Optoelectronics Nanotechnology Graphene oxide paper Metallurgy Optics 2023 en info:eu-repo/semantics/article journal-article https://doi.org/10.1016/j.sse.2023.108705 Solid-State Electronics Solid-State Electronics urn:issn:0038-1101 urn:issn:1879-2405 Solid-State Electronics, 2023, vol. 207, p. 108705 info:eu-repo/semantics/closedAccess closedAccess Q3 Industry, innovation and infrastructure Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Nanofibers as a Delivery System for Arbuscular Mycorrhizal Fungi José M. Campaña Melvin Arias Polanco Microbial inoculant Nanofiber Phaseolus Dry weight Biology Horticulture Inoculation Colonization Agronomy Materials science Arbuscular mycorrhizal fungi (AMF) are beneficial symbiotic organisms that play an important role in the water absorption and nutrient assimilation for a wide variety of plants. In this work, the use of polyethylene oxide (PEO) nanofibers was studied as a delivery system for AMF through the coated nanofibers of common bean seeds ( Phaseolus vulgaris L var. José Beta). Thus, the effect of PEO nanofibers on the infective capacity of AMF and the indicator parameters of plant growth promotion (height plant, root length, number of leaves, number of flower buds, number of pods, fresh weight, and dry weight) was examined. Likewise, the mycorrhizal colonization rate and the indicator parameters of plant growth promotion between a conventional inoculation strategy and inoculation by nanofiber-coated seeds were compared. The results show that PEO nanofibers did not have any negative effect on the infective capacity of AMF or the indicator parameters of plant growth promotion. On the other hand, the inoculated bean plants showed a significant increase of 200, 140, and 143% in the number of flower buds, fresh weight, and dry weight, respectively. Moreover, no significant differences were observed in the mycorrhizal colonization rate between the two inoculation strategies used, even though the inoculant dose was 97% lower for the nanofiber-coated seeds. Therefore, nanofibers could represent a promising alternative as a seed-coating material and for the development of easy-to-apply and economically viable technologies for the application of AMF inoculants in the fields of agriculture, horticulture, forestry, ecological remediation, and related areas. 2020 en info:eu-repo/semantics/article journal-article https://doi.org/10.1021/acsapm.0c00874 ACS Applied Polymer Materials ACS Applied Polymer Materials urn:issn:2637-6105 ACS Applied Polymer Materials, 2020, vol. 2, n. 11, p. 5033-5038 info:eu-repo/semantics/openAccess openAccess cc-by https://zenodo.org/record/5012709 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Evaluation of the molecular inclusion process of β-hexachlorocyclohexane in cyclodextrins Ulises J. Jáuregui-Haza Anthuan Ferino-Pérez Juan José Gamboa-Carballo Ronald Ranguin Joëlle Levalois-Grützmacher Yves Bercion Sarra Gaspard Ramón Alain Miranda-Quintana Melvin Arias beta-hexachlorocyclohexane cyclodextrins host-guest interactions pesticide removal water purification γ-cyclodextrin host-guest chemistry dispersion interactions quantum theory of atoms in molecules charge transfer The present work aimed to study the guest-host complexes of β-hexachlorocyclohexane (β-HCH), a pesticide with high environmental stability that can cause severe health problems, with the most common cyclodextrins (α-, β-, and γ-CDs). The formation reactions of these molecular inclusion complexes were addressed in this research. The multiple minima hypersurface methodology, quantum calculations based on density functional theory and a topological exploration of the electron density based on the quantum theory of atoms in molecules approach were used to characterize the interaction spaces of the pollutant with the three CDs. Additionally, charge distribution, charge transfer and dual descriptor analyses were employed to elucidate the driving forces involved in the formation of these molecular inclusion complexes. Three types of fundamental interactions were observed: total occlusion, partial occlusion and external interaction (non-occlusion). Finally, experiments were performed to confirm the formation of the studied complexes. The most stable complexes were obtained when γ-CD was the host molecule. The interactions between the pesticide and CDs have fundamentally dispersive natures, as was confirmed experimentally by spectroscopic results. All the obtained results suggest the possibility of using CDs for the purification and treatment of water polluted with β-HCH. 2019 en info:eu-repo/semantics/article journal-article https://doi.org/10.1039/c9ra04431k RSC Advances RSC Advances urn:issn:2046-2069 RSC Advances, 2019, vol. 9, n. 47, p. 27484-27499 info:eu-repo/semantics/openAccess openAccess cc-by https://pubs.rsc.org/en/content/articlepdf/2019/ra/c9ra04431k Q1 doaj pubmed Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Dynamics of multiparticle Carroll-Schrödinger quantum systems José Rojas Melvin Arias Polanco Quantum Dynamics (music) Quantum dynamics Quantum system Field (mathematics) Quantum entanglement 2026 en info:eu-repo/semantics/article journal-article https://doi.org/10.1103/kt92-y6j6 Physical review. D/Physical review. D. Physical review. D/Physical review. D. urn:issn:2470-0010 urn:issn:2470-0029 Physical review. D/Physical review. D., 2026, vol. 113, n. 8 info:eu-repo/semantics/closedAccess closedAccess Q1 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Adsorption Kinetics of Hg(II) on Eco-Friendly Prepared Oxidized Graphenes Talía Tene Fabian Arias Arias Marco Guevara Juan Carlos González García Melvin Arias Polanco Andrea Scarcello Lorenzo S. Caputi Stefano Bellucci Cristian Vacacela Gómez Graphene Adsorption Oxide Chemisorption Kinetics Chemical engineering Scanning electron microscope Raman spectroscopy Materials science Transmission electron microscopy Chemistry Nanotechnology Organic chemistry Composite material Metallurgy Extra-functionalized oxidized graphenes are widely preferred for the removal of different pollutants, however, removal with pristine oxidized graphenes, i.e., graphene oxide (GO) and reduced graphene oxide (rGO) is vaguely explored. Herein, we report a comparative adsorption kinetics study of the removal of mercury(II) (Hg(II)) from water using eco-friendly prepared GO and rGO. This work consists of the synthesis protocol and the corresponding morphological and spectroscopical characterization of the obtained pristine adsorbents as well as the adsorption mechanism in terms of initial concentration, removal percentage, pseudo-first and pseudo-second-order models, intraparticle diffusion study, and pH analysis. In particular, scanning electron microscope (SEM) and transmission electron microscope (TEM) images evidence the presence of thin sheets with some defects on the GO structure, these defects substantially disappear in rGO, after reduction. Raman spectrum of rGO shows a less intense D* peak which is attributed to the diamond-like carbon phase. Most importantly, the equilibrium adsorption time in GO is 10 min with a removal percentage of ~28% while in rGO it is 20 min with a removal percentage of ~75%. The adsorption process of Hg(II) either in GO or rGO is more in line with the pseudo-second-order model, suggesting that the adsorption kinetics could be controlled by chemisorption. Our results evidence the interesting adsorbing properties of pristine oxidized graphenes and are expected to be useful for the proposal and study of non-extra functionalized graphene-based materials for water treatment. 2022 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/coatings12081154 Coatings Coatings urn:issn:2079-6412 Coatings, 2022, vol. 12, n. 8, p. 1154 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-6412/12/8/1154/pdf?version=1660121548 Q2 doaj Clean water and sanitation Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal On the Continuity Equation in Space–Time Algebra: Multivector Waves, Energy–Momentum Vectors, Diffusion, and a Derivation of Maxwell Equations Manuel Beato Vásquez Melvin Arias Polanco Multivector Mathematics Mathematical physics Momentum (technical analysis) Maxwell's equations Space (punctuation) Diffusion Algebra over a field Physics Mathematical analysis Pure mathematics Computer science Quantum mechanics Filtered algebra Historically and to date, the continuity equation (C.E.) has served as a consistency criterion for the development of physical theories. In this paper, we study the C.E. employing the mathematical framework of space–time algebra (STA), showing how common equations in mathematical physics can be identified and derived from the C.E.’s structure. We show that, in STA, the nabla equation given by the geometric product between the vector derivative operator and a generalized multivector can be identified as a system of scalar and vectorial C.E.—and, thus, another form of the C.E. itself. Associated with this continuity system, decoupling conditions are determined, and a system of wave equations and the generalized analogous quantities to the energy–momentum vectors and the Lorentz force density (and their corresponding C.E.) are constructed. From the symmetry transformations that make the C.E. system’s structure invariant, a system with the structure of Maxwell’s field equations is derived. This indicates that a Maxwellian system can be derived not only from the nabla equation and the generalized continuity system as special cases, but also from the symmetries of the C.E. structure. Upon reduction to well-known simpler quantities, the results found are consistent with the usual STA treatment of electrodynamics and hydrodynamics. The diffusion equation is explored from the continuity system, where it is found that, for decoupled systems with constant or explicitly dependent diffusion coefficients, the absence of external vector sources implies a loss in the diffusion equation structure, transforming it into Helmholtz-like and wave equations. 2024 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/math12142270 Mathematics Mathematics urn:issn:2227-7390 Mathematics, 2024, vol. 12, n. 14, p. 2270 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2227-7390/12/14/2270/pdf?version=1721648267 Q2 doaj Affordable and clean energy Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Toward Large-Scale Production of Oxidized Graphene Talía Tene Gabriela Tubon Usca Marco Guevara Raúl Cobo Molina Francesco Veltri Melvin Arias Polanco Lorenzo S. Caputi Cristian Vacacela Gómez Graphene Exfoliation joint Materials science Raman spectroscopy Graphite Graphite oxide Oxide Nanotechnology Scanning electron microscope Graphene oxide paper Chemical engineering Thermogravimetric analysis Composite material Metallurgy The oxidative exfoliation of graphite is a promising approach to the large-scale production of graphene. Conventional oxidation of graphite essentially facilitates the exfoliation process; however, the oxidation procedure releases toxic gases and requires extensive, time-consuming steps of washing and reduction to convert exfoliated graphene oxide (GO) into reduced graphene oxide (rGO). Although toxic gases can be controlled by modifying chemical reactions, filtration, dialysis, and extensive sonication are unfavorable for large-scale production. Here, we report a complete, scalable, and green synthesis of GO, without NaNO3, followed by reduction with citric acid (CA). This approach eliminates the generation of toxic gases, simplifies the washing steps, and reduces the time required to prepare rGO. To validate the proposed method, we present spectroscopical and morphological studies, using energy-dispersive X-ray spectroscopy (EDS), UV-visible spectroscopy, infrared spectroscopy, Raman spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thermal gravimetric analysis (TGA) is used to analyze the thermal properties of GO and rGO. This eco-friendly method proposes a complete guideline protocol toward large-scale production of oxidized graphene, with potential applications in supercapacitors, fuel cells, composites, batteries, and biosensors. 2020 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano10020279 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2020, vol. 10, n. 2, p. 279 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/10/2/279/pdf?version=1581130773 Q1 doaj pubmed Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Porous Carbon Materials Obtained by the Hydrothermal Carbonization of Orange Juice Francesco Veltri Francesca Alessandro Andrea Scarcello Amerigo Beneduci Melvin Arias Polanco Denia Cid Perez Cristian Vacacela Gómez Adalgisa Tavolaro G. Giordano Lorenzo S. Caputi Hydrothermal carbonization Carbonization Pomace Chemical engineering Materials science X-ray photoelectron spectroscopy Nitrogen Orange juice Carbon fibers Supercapacitor Sorption Scanning electron microscope Porosity Chemistry Adsorption Organic chemistry Composite number Composite material Electrode Electrochemistry Porous carbon materials are currently subjected to strong research efforts mainly due to their excellent performances in energy storage devices. A sustainable process to obtain them is hydrothermal carbonization (HTC), in which the decomposition of biomass precursors generates solid products called hydrochars, together with liquid and gaseous products. Hydrochars have a high C content and are rich with oxygen-containing functional groups, which is important for subsequent activation. Orange pomace and orange peels are considered wastes and then have been investigated as possible feedstocks for hydrochars production. On the contrary, orange juice was treated by HTC only to obtain carbon quantum dots. In the present study, pure orange juice was hydrothermally carbonized and the resulting hydrochar was filtered and washed, and graphitized/activated by KOH in nitrogen atmosphere at 800 °C. The resulting material was studied by transmission and scanning electron microscopy, Raman spectroscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and nitrogen sorption isotherms. We found porous microspheres with some degree of graphitization and high nitrogen content, a specific surface of 1725 m2/g, and a pore size distribution that make them good candidates for supercapacitor electrodes. 2020 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano10040655 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2020, vol. 10, n. 4, p. 655 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/10/4/655/pdf?version=1586255722 Q1 doaj pubmed Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal The Adsorption of Methylene Blue on Eco-Friendly Reduced Graphene Oxide Fabian Arias Arias Marco Guevara Talía Tene Paola Angamarca Raúl Cobo Molina Andrea Valarezo Orlando Salguero Cristian Vacacela Gómez Melvin Arias Polanco Lorenzo S. Caputi Methylene blue Graphene Adsorption Environmentally friendly Oxide Materials science Chemical engineering Nanotechnology Chemistry Organic chemistry Metallurgy Engineering Catalysis Recently, green-prepared oxidized graphenes have attracted huge interest in water purification and wastewater treatment. Herein, reduced graphene oxide (rGO) was prepared by a scalable and eco-friendly method, and its potential use for the removal of methylene blue (MB) from water systems, was explored. The present work includes the green protocol to produce rGO and respective spectroscopical and morphological characterizations, as well as several kinetics, isotherms, and thermodynamic analyses to successfully demonstrate the adsorption of MB. The pseudo-second-order model was appropriated to describe the adsorption kinetics of MB onto rGO, suggesting an equilibrium time of 30 min. Otherwise, the Langmuir model was more suitable to describe the adsorption isotherms, indicating a maximum adsorption capacity of 121.95 mg g−1 at 298 K. In addition, kinetics and thermodynamic analyses demonstrated that the adsorption of MB onto rGO can be treated as a mixed physisorption–chemisorption process described by H-bonding, electrostatic, and π − π interactions. These results show the potential of green-prepared rGO to remove cationic dyes from wastewater systems. 2020 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano10040681 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2020, vol. 10, n. 4, p. 681 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/10/4/681/pdf?version=1586251863 Q1 doaj pubmed Clean water and sanitation Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Drying-Time Study in Graphene Oxide Talía Tene Marco Guevara Andrea Valarezo Orlando Salguero Fabian Arias Arias Melvin Arias Polanco Andrea Scarcello Lorenzo S. Caputi Cristian Vacacela Gómez Graphene Raman spectroscopy Oxide Materials science Transmission electron microscopy Stacking Blueshift Spectroscopy Absorption (acoustics) Absorption spectroscopy Analytical Chemistry (journal) Scanning electron microscope Molecule Chemical engineering Nanotechnology Optics Composite material Optoelectronics Chemistry Photoluminescence Graphene oxide (GO) exhibits different properties from those found in free-standing graphene, which mainly depend on the type of defects induced by the preparation method and post-processing. Although defects in graphene oxide are widely studied, we report the effect of drying time in GO and how this modifies the presence or absence of edge-, basal-, and sp3-type defects. The effect of drying time is evaluated by Raman spectroscopy, UV-visible spectroscopy, and transmission electron microscopy (TEM). The traditional D, G, and 2D peaks are observed together with other less intense peaks called the D’, D*, D**, D+G, and G+D. Remarkably, the D* peak is activated/deactivated as a direct consequence of drying time. Furthermore, the broad region of the 2D peak is discussed as a function of its deconvoluted 2D1A, 2D2A, and D+G bands. The main peak in UV-visible absorption spectra undergoes a redshift as drying time increases. Finally, TEM measurements demonstrate the stacking of exfoliated GO sheets as the intercalated (water) molecules are removed. 2021 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano11041035 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2021, vol. 11, n. 4, p. 1035 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/11/4/1035/pdf?version=1618810870 Q1 doaj pubmed Clean water and sanitation Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide Talía Tene Stefano Bellucci Marco Guevara Edwin Viteri Melvin Arias Polanco Orlando Salguero Eder Vera-Guzmán Sebastián Valladares Andrea Scarcello Francesca Alessandro Lorenzo S. Caputi Cristian Vacacela Gómez Cationic polymerization Adsorption Chemisorption Graphene Aqueous solution Physisorption Oxide Pollutant Chemistry Methylene blue Environmentally friendly Chemical engineering Wastewater Inorganic chemistry Materials science Photocatalysis Nanotechnology Organic chemistry Environmental engineering Catalysis Reduced graphene oxide (rGO) is one of the most well-known graphene derivatives, which, due to its outstanding physical and chemical properties as well as its oxygen content, has been used for wastewater treatment technologies. Particularly, extra functionalized rGO is widely preferred for treating wastewater containing dyes or heavy metals. Nevertheless, the use of non-extra functionalized (pristine) rGO for the removal of cationic pollutants is not explored in detail or is ambiguous. Herein, pristine rGO—prepared by an eco-friendly protocol—is used for the removal of cationic pollutants from water, i.e., methylene blue (MB) and mercury-(II) (Hg-(II)). This work includes the eco-friendly synthesis process and related spectroscopical and morphological characterization. Most importantly, the investigated rGO shows an adsorption capacity of 121.95 mg g−1 for MB and 109.49 mg g−1 for Hg (II) at 298 K. A record adsorption time of 30 min was found for MB and 20 min for Hg (II) with an efficiency of about 89% and 73%, respectively. The capture of tested cationic pollutants on rGO exhibits a mixed physisorption–chemisorption process. The present work, therefore, presents new findings for cationic pollutant adsorbent materials based on oxidized graphenes, providing a new perspective for removing MB molecules and Hg(II) ions. 2022 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano12030309 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2022, vol. 12, n. 3, p. 309 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/12/3/309/pdf?version=1642668433 Q1 doaj pubmed Clean water and sanitation Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Adsorption of Mercury on Oxidized Graphenes Talía Tene Stefano Bellucci Marco Guevara Fabian Arias Arias Miguel Ángel Sáez Paguay John Marcos Quispillo Moyota Melvin Arias Polanco Andrea Scarcello Cristian Vacacela Gómez Salvatore Straface Lorenzo S. Caputi Fernando Javier Torres Graphene Adsorption Oxide Nanomaterials Aqueous solution Materials science Chemical engineering Mercury (programming language) Inorganic chemistry Nanotechnology Chemistry Organic chemistry Metallurgy Graphene oxide (GO) and its reduced form, reduced graphene oxide (rGO), are among the most predominant graphene derivatives because their unique properties make them efficient adsorbent nanomaterials for water treatment. Although extra-functionalized GO and rGO are customarily employed for the removal of pollutants from aqueous solutions, the adsorption of heavy metals on non-extra-functionalized oxidized graphenes has not been thoroughly studied. Herein, the adsorption of mercury(II) (Hg(II)) on eco-friendly-prepared oxidized graphenes is reported. The work covers the preparation of GO and rGO as well as their characterization. In a further stage, the description of the adsorption mechanism is developed in terms of the kinetics, the associated isotherms, and the thermodynamics of the process. The interaction between Hg(II) and different positions of the oxidized graphene surface is explored by DFT calculations. The study outcomes particularly demonstrate that pristine rGO has better adsorbent properties compared to pristine GO and even other extra-functionalized ones. 2022 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano12173025 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2022, vol. 12, n. 17, p. 3025 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/12/17/3025/pdf?version=1662021668 Q1 doaj pubmed Clean water and sanitation Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Temperature-Dependent Optical Properties of Oxidized Graphenes Talía Tene Paola G. Vinueza Naranjo Yesenia Cevallos Fabian Arias Arias Matteo La Pietra Andrea Scarcello Yolenny Cruz Salazar Melvin Arias Polanco Salvatore Straface Cristian Vacacela Gómez Lorenzo S. Caputi Stefano Bellucci Graphene Materials science Absorbance Oxide Band gap Absorption (acoustics) Absorption spectroscopy Attenuation coefficient Optoelectronics Photon energy Visible spectrum Nanotechnology Photon Optics Composite material In this study, we investigate how changing important synthesis-related parameters can affect and control the optical characteristics of graphene oxide (GO) and reduced graphene oxide (rGO). These parameters include drying time and reduction time at two different temperatures. We obtain an understanding of their impact on optical transitions, optical bandgap, absorption coefficient, and absorbance spectrum width by analyzing these factors. Accordingly, GO has an optical bandgap of about 4 eV, which is decreased by the reduction process to 1.9 eV. Both GO and rGO display greater absorption in the visible spectrum, which improves photon capture and boosts efficiency in energy conversion applications. Additionally, our results show that GO and rGO have higher absorption coefficients than those previously reported for dispersions of exfoliated graphene. Defects in GO and rGO, as well as the presence of functional oxygen groups, are the main contributors to this increased absorption. Several measurements are carried out, including spectroscopic and morphological studies, to further support our findings. 2023 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano13152263 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2023, vol. 13, n. 15, p. 2263 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/13/15/2263/pdf?version=1691380980 Q1 doaj pubmed Affordable and clean energy Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Stable Supercapacitors Based on Activated Carbon Prepared from Italian Orange Juice Andrea Scarcello Francesca Alessandro Yolenny Cruz Salazar Melvin Arias Polanco Cristian Vacacela Gómez Talía Tene Marco Guevara Stefano Bellucci Salvatore Straface Lorenzo S. Caputi Supercapacitor Carbonization Materials science Activated carbon Energy storage Capacitance Electrolyte Chemical engineering Carbon fibers Electrochemistry Nanotechnology Context (archaeology) Electrode Durability Composite material Chemistry Composite number Adsorption Organic chemistry Scanning electron microscope The development of efficient energy storage systems is critical in the transition towards sustainable energy solutions. In this context, the present work investigates the viability of using orange juice, as a promising and sustainable precursor, for the synthesis of activated carbon electrodes for supercapacitor technologies. Through the carbonization-activation process and controlling the preparation parameters (KOH ratio and activation time), we have tailored the specific surface area (SSA) and pore size distribution (PSD) of the resulting carbon materials—crucial parameters that support supercapacitive performance. Several spectroscopic, morphological, and electrochemical techniques are used to characterize the obtained carbon materials. In particular, our optimization efforts revealed that a 5:1 KOH ratio with an activation time up to 120 min produced the highest SSA of about 2203 m2/g. Employing these optimal conditions, we fabricated symmetric coin cell supercapacitors using Na2SO4 as the electrolyte, which exhibited interesting specific capacitance (~56 F/g). Durability testing over 5000 cycles sustained the durability of the as-made activated carbon electrodes, suggesting an excellent retention of specific capacitance. This study not only advances the field of energy storage by introducing a renewable material for electrode fabrication but also contributes to the broader goal of waste reduction through the repurposing of food byproducts. 2023 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano14010071 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2023, vol. 14, n. 1, p. 71 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/14/1/71/pdf?version=1703578966 Q1 doaj pubmed Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal A Facile and Green Approach for the Preparation of Silver Nanoparticles on Graphene Oxide with Favorable Antibacterial Activity Talía Tene Stefano Bellucci Joseth Pachacama María F. Cuenca-Lozano Gabriela Tubon Usca Marco Guevara Matteo La Pietra Yolenny Cruz Salazar Andrea Scarcello Melvin Arias Polanco Lala Rasim Gahramanli Cristian Vacacela Gómez Lorenzo S. Caputi Graphene Silver nanoparticle Antibacterial activity Materials science Raman spectroscopy Nuclear chemistry Transmission electron microscopy Nanoparticle Nanotechnology Scanning electron microscope Composite number Chemical engineering Oxide Chemistry Composite material Bacteria Metallurgy Herein, we introduce a simple precipitation method for preparing graphene oxide–silver nanoparticle (GO/AgNP) composites, utilizing Calendula officinalis (C. officinalis) seed extract as both a reducing and stabilizing agent. Our research combines the sustainable preparation of graphene oxide (GO) with the green synthesis of silver nanoparticles (AgNPs), aiming to explore the potential of the obtained composite as a novel antibacterial material. To establish a benchmark, the synthesis was also performed using sodium citrate, a conventional reducing agent. The resultant GO/AgNP composites were characterized through several analytical techniques, including scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDS), Raman spectroscopy, X-ray diffraction (XRD), infrared (IR) spectroscopy, and ultraviolet–visible (UV-vis) spectroscopy, confirming the successful functionalization of GO with AgNPs. The antibacterial effectiveness of the composites was systematically assessed against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus), with nanoparticle concentrations spanning from 0 to 250 µg/mL, utilizing mostly disk diffusion and colony-forming unit (CFU) count assays. The AgNPs were characterized by a size range of 15–50 nm. Notably, the GO/AgNP composite prepared using C. officinalis seed extract demonstrated superior antibacterial activity at all tested concentrations, outperforming both pure GO and the GO/AgNP composite prepared with sodium citrate. The most pronounced antibacterial effect was observed at a concentration of 32.0 µg/mL. Therefore, this innovative synthesis approach may offer a valuable contribution to the development of new therapeutic agents to combat bacterial infections, suggesting further exploration into antibacterial coatings or potential drug development. 2024 en info:eu-repo/semantics/article journal-article https://doi.org/10.3390/nano14171455 Nanomaterials Nanomaterials urn:issn:2079-4991 Nanomaterials, 2024, vol. 14, n. 17, p. 1455 info:eu-repo/semantics/openAccess openAccess cc-by https://www.mdpi.com/2079-4991/14/17/1455/pdf?version=1725688866 Q1 doaj pubmed Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Positive manganese lithium oxide-stabilised electrode for a secondary lithium battery and a method for producing same 2018 info:eu-repo/semantics/patent patent cris:cris-00fa09c3 2018 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Adsorption of paracetamol onto carbon nanomaterials and degradation by ultrasonic and gamma radiation 2016 info:eu-repo/semantics/conferenceObject proceedings-article cris:cris-13ad8f9c Advanced Materials - TechConnect Briefs 2016 Advanced Materials - TechConnect Briefs 2016 Advanced Materials - TechConnect Briefs 2016, 2016 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Nanoaggregates of organochlorine pesticides in natural cyclodextrins as an alternative for the treatment of polluted waters,Nanoagregados de plaguicidas organoclorados en ciclodextrinas naturales como alternativa para el tratamiento de aguas contaminadas 2022 info:eu-repo/semantics/article journal-article cris:cris-3386dd62 Anales de la Academia de Ciencias de Cuba Anales de la Academia de Ciencias de Cuba Anales de la Academia de Ciencias de Cuba, 2022 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal Classification of Electromagnetic Fields in non-Relativist Mechanics 2008 info:eu-repo/semantics/article journal-article cris:cris-b2c52e83 2008 Instituto Tecnológico de Santo Domingo https://www.intec.edu.do/portal