Roberto Acevedo

San Sebastian University | USS · Ingeniería Civil-Minas

It has been a never-ending quest to design a safe, cost-effective, and environmentally acceptable technology for eliminating contaminants from water and countering antibiotic resistance. Herein, a waste leaf extract from the abundant and renewable plant, Brassica oleracea var. gongylodes, is introduced as a cost-effective and sustainable means to g...

The analysis of ferro-nanofluidic flow is carried out for magnetic and temperature variability. Indicators such as Small Alignment Index (SALI), Fast Lyapunov Indicator (FLI) and Dynamic Lyapunov Indicator (DLI) compute regular as well as chaotic motions. LCEs & Bifurcations also carried out for Ha as well as Ra variations. Entropy quantifies proba...

In this work, synthesis, and crystal structure of molecule 2-amino-4′-fluorobenzophenone (FAB) is confirmed by using FT-IR, FT-Raman, ¹H and ¹³C NMR chemical shifts, compared with calculated parameters using B3LYP/ 6-311+G(d) basis sets in water were found in good agreement. The optimized geometry of the molecule (FAB) was compared to the experimen...

In this study, novel 3D/3D/2D-Co3O4/Bi2O3/rGO ternary nanocomposites is were successfully synthesized via hydrothermal technique assisted with self-assembly process. The prepared materials were characterized for their morphological, structural, and optical properties using various techniques such as XRD, FTIR, SEM, EDX, TEM, and UV-DRS. The composi...

Novel indoles amines have been synthesized and screened for antioxidant activity. Chiron approach is used to synthesis enantiopure heterocycles. Newly synthesized indole amines showed good antioxidant potential as compared to standard drugs. Novel indole amines (13–17) were synthesized and showed promising DPPH• scavenging activity, The H2O2 inhibi...

Over the past decades, an abundant deal of work has been devoted to the production of nanoscale materials for environmental remediation. Favorable outcomes have been attained in this regard where scholars managed to improve nanomaterials that propose the probability of effective adsorption or destruction of contaminants and sterilization of bacteri...

We developed an improved hexagonal wurtzite ZnO and ZnO/C microflowers through the facile hydrothermal technique. The obtained nanostructures were characterized using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectrosc...

In this study, Fe2O3 nanoparticles were produced by using Leucas aspera and Jatropha podagrica leaf extract by simple green-synthesis technique. The synthesized nanostructures were analyzed by using various characterization techniques such as XRD, FT-IR, UV-DRS, SEM-EDX and TEM analysis. The XRD results show shows the formation of highly crystallin...

Nanoparticles are of great scientific interest as their utility can fill the gap between bulk materials and atomic or molecular structures. Nanoparticles often possess unexpected physical, magnetic, optical and electrical properties. Basically, structure-wise they are very small in size and due to this they confine their electrons and produce quant...

The effect of g-C3N4 on the structural, optical, and photocatalytic properties of ZnO microcrystals under hydrothermal conditions was investigated in this research. The addition of g-C3N4 changed not only the phase composition, but also affect the growth of ZnO crystals, changing the lattice parameter and the transformation of hexagonal cylinder-li...

This research article aims to tackle the many challenges that the academic communities all over the country should face and resolved with reference to several items such as the introduction into new methodologies. The strategies to overcome our weakness and the facilities which should be made available to become highly competitive and therefore to...

In this study, we synthesized the visible-light-driven photocatalytic activity of CdO nanowires and g-C3N4/CdO hybrid nanostructure by the hydrothermal method. X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectrometry, and UV–Vis diffuse reflectance spectroscopy studies were carried out to compare the structural, morphol...

The proximate composition of extracts from three selected agro-wastes (rice husk, pea peels and orange peels) was determined by following AACC protocols. All wastes were found to have intrinsic phytochemical compositions which are responsible for their antimicrobial and/or antioxidant potential. Amongst the wastes, orange peel had largest amount of...

The hybrid Nickel oxide/Reduced graphene oxide (NiO/rGO) nanostructure was prepared through facile one-pot microwave irradiation technique. X-ray Diffraction (XRD) and Transmission electronic microscope (TEM) results suggests the formation of the cubic structure of NiO with well uniform spherical shaped morphology. The morphological analysis reveal...

In this article, Bio-treatment of α-Fe2O3 nanostructure using Phyllanthus niruri and Moringa stenopetala leaf extract as an effective reducing agent is carried out. The preparation of the rhombohedral α-Fe2O3 nanostructure is confirmed using X-ray diffraction analysis. The adsorption of biomolecules on the surface of the α-Fe2O3 nanostructure is co...

Fast electron–hole recombination rate, lower free radical generation, unsuitable valence band maximum (VBM) and conduction band minimum (CBM) position of SnO2 nanoparticle are the shortfalls in achieving a superior photocatalytic performance of organic dye degradation under sunlight irradiation. To rise above these margins, for the first time, the...

CuO NPs were planned to synthesize using Abutilon indicum (A. indicum) leaf aqueous extract as an ecofriendly source without any harmful chemicals like other physio‐chemical methods. The ecofriendly synthesized shape controlled CuO NPs is further processed for several characterization tools to identify the morphology and its physical nature. Synthe...

A new series of triphenylamine (TPA)-based organic dyes (A1-A4) are characterized and implemented as photosensitizers for dye-sensitized solar cells (DSSCs). In the modern-day examines, four tuning organizations of electron acceptor were designed based on TPC-1. The dye molecules contain A1, A2, A3, and A4, linked on TPA, stilbene (St). TPA, St, an...

A novel hybrid nanocomposite of g‐C3N4/ZnFe2O4 was successfully prepared by a facile hydrothermal method followed by an annealing process. The obtain hybrid catalyst was systematically characterized by XRD, TEM, HRTEM, FT‐IR, UV‐DRS and XPS analysis in order to study the structural, morphological, optical properties and chemical states. The cubic p...

We designed and screened a series of metal-free organic dyes with different tunable donors (D1–D3) based on literature dye (3a). The D1–D3 organic dyes have been applied in dye-sensitized solar cells (DSSCs). Triphenylamine, thiophene and 2-cyanoacrylic acid groups as an electron donor (D), spacer (π) and electron acceptor (A), respectively, to for...

ABSTRACT In this work of memory, we have chosen Uranium, its processes and materials associated with the purpose of carrying out an exhaustive review of the associated properties from a physicochemical point of view and in general in the area of Metallurgy. Uranium is a silver-colored metal whose atomic number is ninety-two. Its main use is as fu...

ABSTRACT In this work of memory, we have chosen Uranium, its processes and materials associated with the purpose of carrying out an exhaustive review of the associated properties from a physicochemical point of view and in general in the area of Metallurgy. Uranium is a silver-colored metal whose atomic number is ninety-two. Its main use is as fu...

Abstract The desalination industry has been present for a long time, mainly in countries in the Middle East and some European countries thanks to the scarcity of water in these territories, where there are currently desalination plants with large capacities. In Chile, the discussion on water resources has been a constant theme, however, water sc...

ABSTRACT The main objective of this study is the exhaustive and rigorous analysis of the physical, chemical, mechanical, magnetic, electrical properties of two lanthanide ions, namely: 12 57 (5 6 ) La d s and ( ) 4 0 2 60 4 5 6 Nd f d s and its materials and technological properties associated, with special emphasis on innovation and technologic...

ABSTRACT The elements of internal transition, are subdivided between the lanthanides and actinides, the former are characterized by sharing the energy level around 4𝑓 orbitals and for possessing an increasing order of atomic number (𝑍 = 57 − 71), and that added to the elements of the scandium (𝑍 = 21) and yttrium (𝑍 = 39), are known as rare earth...

One of the most major features in the improvement of dye-sensitized solar cells (DSSCs) is the survey and plan of high-efficiency and low-cost dyes. In this paper, a new series of metal-free coumarin-based (NKX-2311) dye molecules, namely (D1–D4) are investigated for use in DSSC applications. The dye molecules contain three parts, electron-donor (D...

This research demonstrates the synthesis of phase pure Fe2O3 nanoclusters using Caralluma Fimbriata and Achyranthes Aspera as reducing and stabilizing agents. The structure and physicochemical property of the nanoparticles are characterized by X-Ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Ultraviolet Diffuse Reflectance...

We herein report a facile and high yielding protocol for silica-supported heterogeneous catalysts-mediated synthesis of chalcones. A comparison of results of our synthesis with conventional synthetic protocols is also being offered to assess the efficiency of the prepared catalysts. Biological evaluation of the newly synthesized compounds as urease...

This article aims to develop a generalized model calculation model to be applicable to the general theory of interaction potentials with reference to the stoichiometric elpasolite type crystals. In this study, we have chosen to report both a theoretical model and a calculation strategy to undertake semi empirical calculations of thermodynamic prope...

A Successful Merger and Acquisition (M&A) seems to be the most expected response to the globalization of the economy. On a number of studies, it has been proved that the failure rate of processes with reference to both mergers and acquisitions lies in the range from 70% to 90%.

Las pozas solares para producción de sales de potasio y salmueras concentradas de litio, son sistemas en los cuales precipitan fraccionadamente sales en un tren de pozas. En el salar de Atacama, Chile, las salmueras se encuentran saturadas en Halita y yeso por lo que la primera poza precipita en forma significativa Halita teniendo bajos contenidos...

In nonmetallic mining, there is a number a complex problems to be worked out so as to quantify and make a separation of various fractions of solids and liquids in systems such as brine-salt type. The major issue is rationalize when a mass balance calculations is performed in the solar ponds every time one wishes to quantify the amount of solids and...

Organic nonlinear optical (NLO) single crystals of 2-amino-4-methylpyridinium-4-hydroxybenzolate (2A4MP4HB) were grown by slow solvent evaporation (SSE) method. The title compound belongs to centrosymmetric space group P21/c in a monoclinic crystal system which was successfully studied by X-Ray Diffraction (XRD) study. Molecular geometry and Vibrat...

In this report, a novel rice like CeO2/MWCNTs nanocomposite was synthesized by a facile hydrothermal route and explore the systematic investigation of the structural, morphological and elemental composition by X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), energy dispersive spectra (EDS), N2 adsorption-desorption and...

Abstract The 1-tetralone scaffold and its derivatives are not only important as pharmacological agents but these also serve as precursors for natural products and compounds of medicinal importance. The easiest way to introduce a substituent on an aromatic as well as aliphatic system is nitration. Once introduced, the –NO2 group can be easily replac...

Zinc oxide (ZnO) nanoparticles are emerged as a leading phtocatlyst for organic dye degradation owing to its non-toxicity, low cost and high photochemical reactivity. In the present work, ZnO nanoparticles with different particle size were prepared via hydrothermal assisted phytofabrication method using Aerva lanata and Aerva javanica flower extrac...

In this manuscript we have prepared nickel oxide nanoparticles (NiO NPs) using Calotropis gigantea latex (CGL) through green synthesis method in which the latex acts as a capping agent. The synthesis part was optimized using RSM-BBD methodology. Further the synthesized NiO NPs were subjected to various analytical techniques like UV–Visible spectros...

The morphology controlled the synthesis of La2O3 is important for their application in the fields of semiconductors. In this work nanostructured La2O3 has been synthesized by reflux method using lanthanum nitrate, urea and double distilled water as starting materials. The approximate band gap of the as-prepared and calcined samples was calculated f...

The consolidation of internal transition elements, better known as Lanthanides have unique characteristics throughout the series, which are covered and described with emphasis on the characterizations of each element. The management and use of these elements begin with the applications in the geological and mining areas. It is essential to acquire...

In this research non-toxic, cost-effective TiO2 nanoparticles were prepared using Phyllanthus niruri leaf extract. The crystallinity and purity of green treated TiO2 nanoparticles were investigated using X-ray diffraction (XRD) studies. The specific functional groups responsible for the reduction of TiO2 nanoparticles were analyzed using Fourier tr...

INTRODUCCION Esta monografía está dividida en tres partes, en que se discute los casos de spin cero, un medio, y el caso general de spin arbitrario, respectivamente. Estos tres casos se discuten desde un punto de vista unificado, en el sentido que las ecuaciones diferenciales que los describen tienen una estructura semejante cuando se expresan en t...

INTRODUCCION Esta monografía está dividida en tres partes, en que se discute los casos de spin cero, un medio, y el caso general de spin arbitrario, respectivamente. Estos tres casos se discuten desde un punto de vista unificado, en el sentido que las ecuaciones diferenciales que los describen tienen una estructura semejante cuando se expresan en t...

The structural and the optoelectronic properties of reduced graphene oxide based nanostructures were manageable, creating them favourable for applications in miscellaneous electronic devices. In this present work, Tin doped Zinc oxide / reduced graphene oxide (Sn doped ZnO/rGO) nanostructures were synthesized using a hydrothermal-assisted self-asse...

In the current work, the enhanced trapping of photo excited charge carriers were successfully obtained by constructing a novel visible light driven Co3O4/TiO2/rGO ternary photocatalyst through facile hydrothermal method. In ternary Co3O4/TiO2/rGO composite rGO sheets acts as charge carrier trappers and the suppression of e--h+ pair recombination wa...

In this study, we designed and successfully prepared all solid state 2D/3D/2D rGO/Fe2O3/g-C3N4 nanocomposite by embedding 3D Fe2O3 nanoparticles on 2D g-C3N4 nanosheets to for 3D/2D Fe2O3/g-C3N4 followed by the addition of 2D rGO nanosheets via a simple hydrothermal technique with the support of response surface methodology for the first time. The...

The photoexcited charge carriers trapping was an effective way to generate a large number of active species like O2.- and OH radicals to oxidize pharmaceutical molecules. In ternary Cu/Bi2Ti2O7/rGO composite Cu nanoparticles and rGO sheets act as charge carrier trappers and the suppression of e−-h+ pair recombination was confirmed by Photoluminesce...

SUMMARY The “Salar de Atacama” has high reserves of brines with high concentrations of lithium and potassium that make them propitious to produce salts, through pools of solar evaporation, which once treated lead to the production of KCl and carbonate or lithium hydroxide. The production of potassium chloride salts that is made in “Atacama”, gene...

Dye‐sensitized solar cells (DSSCs) have considerable attention to the academic and industrial community. Because, it makes solar energy efficient and cost effective to harness. DSSCs is one of the important roles in the design of sensitizers with sustainable and environmentally‐friendly materials. In the present work, a series of D‐π‐A architecture...

The synthesis of bioactive CuO/C nano composite using sucrose as a capping agent is achieved through simple green approach via Response Surface Methodology. The synthesis process was done in a green environment which prevents aggregation of sucrose and promotes nanoparticles formation. The innovative approach produces sucrose as a carbon source med...

ABSTRACT In this title work, it explores in a thorough and analytical way one of the metallic resources that is extracted from the mining industry. In accordance with what is indicated by the U.S. Geological Survey (2018) Chile is the world leader in the production of Rhenium the chemical element. This work has as vision (dream) and mission (strat...

In this article, we have decided to study some relevant issues which were very relevant to the development of the economic situation in Chile about five decades ago, and the strategy used to overcome the many significant inconveniences in a rather polarized society with a huge economic debt. The most relevant periods of time are the military coup b...

Executive Summary In this study, a preliminary technical-economic pre-feasibility analysis is made with reference to the production of Copper Sulphate, in the fourth region of Coquimbo and in particular in the industrial processing plant of the so-called Cobaltera. A study of a copper sulphate plant was carried out in a period of time of the order...

This publication is the following article of the previous already published at the Journal INGLOMAYOR (Vol 14).

This is short communication written to provide some support to students in specific topics in Quantum Chemistry. The topics have been chosen so as to be be both useful and illustrative.

This research work is about some special topics in inorganic chemistry with reference to the observed vibronic intensities in cubic crystals such as Cs[2]SnBr[6](-2):OsBr[6](-2). The model employed is a generalized vibronic intensity method of calculations, using both a crystal field and a ligand polarization models. Special care is placed upon the...

A rather complete and informative analysis of the intermolecular and intramolecular potentials is put forward with reference to the lanthanide type systems, such as 62KLnClCs, in the mFm3, space group. The current study is focused to the trivalent lanthanide ions (Ln), characterized by atomic numbers in the atomic number interval:7158Z. A particu...

In this article, we focus our attention upon a number of academic indicators in order to take action in due time so as to improve and/or modify some components of the current models of education (a new curricula should be worked out based upon the right and appropriate assessment). These lines are devoted to analyze thoroughly, the many changes in...

In a previous articles, we have dealt with a number of attributes which are of paramount importance to improve the quality of life for any well-organized society. The main target in this set of studies is to both focus and underline the importance of the knowledge in the state of the art. It is crucial to realize that nowadays broad topics such as...

This article aims to analyze on a formal basis, the Higher Education System in Chile, as a case of study. The master goal is to asses and articulate the strengths and the weakness of the current educational model. We will focus our attention upon the curricula of Basic Sciences and its relationship with the global set of courses leading to professi...

This article is intended to itemize and describe a number of crucial factors which, we believe are essential to give rise to a well-organized community for the citizens in Chile. The free market economy has become very demanding, while facing a very strong and smart revolution in a number of topics such as technology, science, humanities and fine a...

In this article, a simple cellular automata for modeling of solid self-diffusion process is proposed and it is contrasted with the traditional modeling using differential equations. A bi-dimensional cellular automaton has been designed which evolves regarding the conditions of his neighbors in discrete steps, considering the Von Neumann vicinity, i...

La ciencia culmina con la formulaciÛn de un modelo y de una teorÌa. Desde los albores de la hu-manidad el hombre ha buscado la interpretaciÛn de los fenÛmenos que aprecia directamente o quedetecta mediante instrumentos o artiÖcios. En este contexto, la Önalidad de este trabajo es ilustrar laaplicaciÛn de modelos teÛricos y esquemas de c·lculo en el...

Podría quizás decirse que día a día la Química Analítica está adquiriendo mayor relevancia en el campo de las ciencias experimentales y actuando como un eje motor en el desarrollo de éstas dado que los problemas que debe enfrentar el hombre son cada vez mayores y quizás más complejos. Es esta la razón por la cual se debe expandir el espectro y la i...

This writing will be very brief in consideration to what day that passes appear new complexities in our way. Perhaps, the first one relates to the good use of the language of Cervantes and the second to the messages of various sectors which are difficult to read and understand. The ex-José Ricardo Morales-Malva (QEPD), a great academic with dual na...

En la Parte I de estas reflexiones, tuve la oportunidad de situar algunas ideas en el momento y lugar adecuado, lo cual no es siempre posible. La vida en Comunidad y en particular, en una Institución de Educación Superior es apasionante, no obstante, las complejidades inherentes a la visión y misión de la Institución. El tema es buscar un equilibri...

I.-) Palabras Preliminares: La Universidad de Chile es una Institución emblemática de la República de Chile y su visión (sueño) y misión (estrategia para lograr el sueño) van de la mano (a lo menos en teoría) con elevar el nivel y la calidad de vida de los ciudadanos de esta nación. Desde los albores de su fundación, le corresponde un rol protagóni...

Resumen Se presenta un modelo para los equilibrios ácido-base en solución acuosa basado en el equilibrio iónico del agua: H 2 O + H 2 O $ H 3 O + + OH. Los ácidos se identi…can como agentes electrofílicos que provocan una concentración de H 3 O + superior a 10 7 M. Las bases, por su parte, son de carácter nucleofílico y provocan una concentración d...

A Successful Merger and Acquisition (M&A) strategy seems to be the most expected response to the globalization of the economy. Business transactions of this kind are being carried out all over the world, nevertheless in a recent issue of the HBS magazine, a rather interested view is put forwarded in one of the published article, entitled “The Big I...

The average citizen does not achieve a reasonable level of access and comprehensive understanding of economic issues, which are essential for a country to evolve towards an organized society. There are numerous examples in the history of the nations of the world and in particular, in the Republic of Chile it is not prudent to not verbalize and make...