cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.6858308
title: Electrochemical formation of polypyrrole films on Nitinol from sulfosuccinic acid solutions

description: ABSTRACT In this work the electrosynthesis of polypyrrole (PPy) on Nitinol from solutions of sulfosuccinic acid (0,25 M) and pyrrole (0,25 M) was studied. The PPy was formed potentiostatically in solutions of pH 1 and 7. As far as we know, this is the first time that the electrodeposition of PPy is carried out in the presence of sulfosuccinic acid. The morphology of the films was studied by scanning electron microscopy images, observing the typical globular shape of PPy. The presence of S was also determined by X-ray dispersive energy (EDX), confirming that the dopant was incorporated into the polymer matrix. The films formed are very adherent and exhibit acceptable conductivity. In order to evaluate the corrosion behaviour, different electrochemical experiments were performed in Ringer's solution: measurement of open circuit potential, Tafel plots and linear sweep voltammetry. While both coatings improve the protection of the substrate, the films formed in pH 1 solution offer better results. The analysis of ions in solution by inductive coupled plasma atomic emission spectrometry confirms that the films are protective, preventing the release of Ni ions into the solution.
DOI: 10.6084/m9.figshare.6858308.v1
title: Electrochemical formation of polypyrrole films on Nitinol from sulfosuccinic acid solutions

description: ABSTRACT In this work the electrosynthesis of polypyrrole (PPy) on Nitinol from solutions of sulfosuccinic acid (0,25 M) and pyrrole (0,25 M) was studied. The PPy was formed potentiostatically in solutions of pH 1 and 7. As far as we know, this is the first time that the electrodeposition of PPy is carried out in the presence of sulfosuccinic acid. The morphology of the films was studied by scanning electron microscopy images, observing the typical globular shape of PPy. The presence of S was also determined by X-ray dispersive energy (EDX), confirming that the dopant was incorporated into the polymer matrix. The films formed are very adherent and exhibit acceptable conductivity. In order to evaluate the corrosion behaviour, different electrochemical experiments were performed in Ringer's solution: measurement of open circuit potential, Tafel plots and linear sweep voltammetry. While both coatings improve the protection of the substrate, the films formed in pH 1 solution offer better results. The analysis of ions in solution by inductive coupled plasma atomic emission spectrometry confirms that the films are protective, preventing the release of Ni ions into the solution.
DOI: 10.6084/m9.figshare.6858311.v1
title: Carbon based DLC films: Influence of the processing parameters on the structure and properties

description: ABSTRACT Hydrogenated carbon-based films, such as DLC (“Diamond Like Carbon”), have interesting properties such as excellent tribological behavior, low friction coefficient, high superficial hardness and good wear resistance; they are chemically inert and highly corrosion resistant. They are deposited by means of PACVD (plasma-assisted chemical vapor deposition) with variable film thickness. The load carrying capacity grows with the thickness, so it is possible to deposit thick films on “soft” steels (e.g. low alloyed steels). When increasing coating thickness, surface defects are generated during the deposition process compromising their excellent properties. In this work, different metal substrates have been used to compare adhesion and quantify superficial defects: AISI 316L, DIN 42CrMo4 (AISI 4140) and Böhler K110 (AISI D2). The films were deposited at different temperatures, changing the silicon content and the coating thickness. The samples were placed in the furnace on different positions (standing, lying or up-side down). The films were analyzed with optical and electron microscopy, 3D topography profilometer, and they were tested under sliding wear conditions. Friction coefficient and wear volume were measured, with an average friction coefficient which resulted below 0.05. A higher amount of surface defects was obtained on lying samples compared to the ones up-side down. The quantity of defects increased with the thickness of the coating and decreased with the temperature. The geometry and the growth mechanism of the defects were analyzed.
DOI: 10.6084/m9.figshare.6858302
title: Effects of the use of support electrolytes in electrochemical tests of Al-4wt.% Mg alloy exposed to bioethanol fuel

description: ABSTRACT The growth of world energy demand directly affects the consumption of petroleum-based fuels, increasing the negative impact of the use of these fuels and the decrease of crude oil reserves. This creates an opportunity for the use of fuels that are more efficient, of low environmental impact and, above all, of a renewable nature. Bioethanol is a biofuel that complies with these characteristics, but it has some aggressiveness from the electrochemical plane over conventional metallic systems, requiring a good selection of materials for its use and handling. In the evaluation of the corrosion properties of metal materials exposed to bioethanol, the low conductivity of these organic compounds must be taken into account to avoid difficulties in the development of the tests and the misinterpretation of results. There are currently methods to compensate for the ohmic fall produced by the organic electrolytic medium, one of the most used being the addition of soluble salts in defined concentrations. This work evaluates the effects of the addition of different concentrations of CH3COOK and LiClO4 as support electrolyte to bioethanol, when electrochemical measurements of Potenciodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) are carried out by exposing an aluminum and magnesium alloy to said solution.
DOI: 10.6084/m9.figshare.6858305.v1
title: Solution combustion synthesis of LiCoO2 nanoparticles

description: ABSTRACT Lithium Cobalt Oxide (LiCoO2) nanoparticles were obtained by the Solutions Combustion Synthesis method, using starch as fuel. Four starch/nitrates ratios (φe) (ranging 0.5-1.25) have been studied. One route was a conventional, stoichiometric process, while the other ones were a nonstoichiometric process. The samples were calcined in air at 773K. The synthesized material was analyzed by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, electrochemical charge-discharge and rate capability curves. It was identified that in all cases, powders exhibited rhombohedral crystalline structure. The powders obtained in four reactions exhibited good electrochemical performance.
DOI: 10.6084/m9.figshare.6858299
title: Post-harvest characterization of strawberry hybrids obtained from the crossing between commercial cultivars

description: Abstract The lack of programs to improve the strawberry crop in Brazil has led to a growing increase in the use of seedlings imported from Chile, which leads to a certain dependence of imported material on the part of the producers and increases the production even more, since the producers have. This proves even more the need for the development of cultivars adapted to the local conditions of cultivation. In this sense, the aim was to evaluate the post-harvest of fruits of 15 hybrids of strawberry obtained from the cross between commercial cultivars, in order to select the materials with chemical quality superior to the cultivars most planted in Brazil. The contents of soluble solids, titratable acidity, ratio, vitamin C, anthocyanins and phenol were evaluated. The characterization of strawberry hybrids indicated that the RVFS 13-07, RVFS 13-24, RVCS 13-07, RVCS 13-10 and RVCA 13-08 materials stood out in post-harvest evaluations, with higher levels of functional compounds (vitamin C, anthocyanins and phenolics) and higher values of quality parameters (soluble solids, titratable acidity and ratio), important characteristics for the in natura consumption or for use by the industry. These hybrids were shown to be promising to continue the crop breeding program by demonstrating that they carried characteristics of interest for intraspecific crosses. The values obtained for the analyzed characteristics were higher than the values found in the literature for the cultivars most planted and consumed in Brazil and in the World, which demonstrates the efficiency in the selection process.
DOI: 10.6084/m9.figshare.6858302.v1
title: Effects of the use of support electrolytes in electrochemical tests of Al-4wt.% Mg alloy exposed to bioethanol fuel

description: ABSTRACT The growth of world energy demand directly affects the consumption of petroleum-based fuels, increasing the negative impact of the use of these fuels and the decrease of crude oil reserves. This creates an opportunity for the use of fuels that are more efficient, of low environmental impact and, above all, of a renewable nature. Bioethanol is a biofuel that complies with these characteristics, but it has some aggressiveness from the electrochemical plane over conventional metallic systems, requiring a good selection of materials for its use and handling. In the evaluation of the corrosion properties of metal materials exposed to bioethanol, the low conductivity of these organic compounds must be taken into account to avoid difficulties in the development of the tests and the misinterpretation of results. There are currently methods to compensate for the ohmic fall produced by the organic electrolytic medium, one of the most used being the addition of soluble salts in defined concentrations. This work evaluates the effects of the addition of different concentrations of CH3COOK and LiClO4 as support electrolyte to bioethanol, when electrochemical measurements of Potenciodynamic Polarization and Electrochemical Impedance Spectroscopy (EIS) are carried out by exposing an aluminum and magnesium alloy to said solution.
DOI: 10.6084/m9.figshare.6858296
title: Hippomaneae (Euphorbiaceae) in the Chapada dos Veadeiros National Park, Goiás, Brazil

description: Abstract The Euphorbiaceae of the tribe Hippomaneae are complex and poorly studied taxonomically due to having small and homogeneous flowers. Based on monthly collections since 2011, analysis of herbarium collections and specific literature was performed the taxonomic treatment to the Hippomaneae present in the Chapada dos Veadeiros National Park, an area whose flora is rich and little known. Fifteen species belonging to five genera were found: Microstachys and Sapium, the most diverse, with nine and three species respectively, followed by Gymnanthes, Maprounea and Sebastiania with one species each. Sapium haematospermum is firstly recorded in the state of Goiás. Species identification key, species descriptions with comments and illustrations, besides the transference of Sebastiania anisodonta and S. salicifolia to the genus Microstachys and a lectotipification.
DOI: 10.6084/m9.figshare.6858299.v1
title: Post-harvest characterization of strawberry hybrids obtained from the crossing between commercial cultivars

description: Abstract The lack of programs to improve the strawberry crop in Brazil has led to a growing increase in the use of seedlings imported from Chile, which leads to a certain dependence of imported material on the part of the producers and increases the production even more, since the producers have. This proves even more the need for the development of cultivars adapted to the local conditions of cultivation. In this sense, the aim was to evaluate the post-harvest of fruits of 15 hybrids of strawberry obtained from the cross between commercial cultivars, in order to select the materials with chemical quality superior to the cultivars most planted in Brazil. The contents of soluble solids, titratable acidity, ratio, vitamin C, anthocyanins and phenol were evaluated. The characterization of strawberry hybrids indicated that the RVFS 13-07, RVFS 13-24, RVCS 13-07, RVCS 13-10 and RVCA 13-08 materials stood out in post-harvest evaluations, with higher levels of functional compounds (vitamin C, anthocyanins and phenolics) and higher values of quality parameters (soluble solids, titratable acidity and ratio), important characteristics for the in natura consumption or for use by the industry. These hybrids were shown to be promising to continue the crop breeding program by demonstrating that they carried characteristics of interest for intraspecific crosses. The values obtained for the analyzed characteristics were higher than the values found in the literature for the cultivars most planted and consumed in Brazil and in the World, which demonstrates the efficiency in the selection process.
DOI: 10.6084/m9.figshare.6858293
title: Validation and Analysis of UV Radiation Time Series Collected in Different Peruvian Sites

description: Abstract We evaluate a set of ultraviolet solar radiation (UVR) measurements collected in six locations in Peru: Ica, Tacna, Moquegua, Arequipa, Cajamarca and Marcapomacocha, whose altitudes vary from sea level to 4479 m. The analysis involved the validation and analysis of the ultraviolet index (UVI) and the daily erythemal doses (D-Er). Clear-sky filtered data were compared with numerical simulations provided by the Tropospheric Ultraviolet and Visible (TUV) radiation model in order to estimate numerical regression equations. These equations showed high determination coefficients (R2 &gt; 0.91) statistical significance (p &lt; 0.0001). Results show that the maximum UVI observed in Peru was 23.5 in Marcapomacocha (4479 m above sea level). Regarding D-Er, the highest means were observed in summer at the city of Arequipa with daily averages closer than 7.9 kJm-2 (± 1.3 kJm-2). However, the highest daily dose was observed in Cajamarca in the fall, with 14.3 kJm-2. These large amounts of high D-Er and very high and extreme UVI episodes indicate an important risk to the development of solar-related skin diseases, as the skin cancers. Our analysis provides a new knowledge on the spatial and temporal UV distribution in Peru and an important tool to justify public policies for solar protection.
DOI: 10.6084/m9.figshare.6858296.v1
title: Hippomaneae (Euphorbiaceae) in the Chapada dos Veadeiros National Park, Goiás, Brazil

description: Abstract The Euphorbiaceae of the tribe Hippomaneae are complex and poorly studied taxonomically due to having small and homogeneous flowers. Based on monthly collections since 2011, analysis of herbarium collections and specific literature was performed the taxonomic treatment to the Hippomaneae present in the Chapada dos Veadeiros National Park, an area whose flora is rich and little known. Fifteen species belonging to five genera were found: Microstachys and Sapium, the most diverse, with nine and three species respectively, followed by Gymnanthes, Maprounea and Sebastiania with one species each. Sapium haematospermum is firstly recorded in the state of Goiás. Species identification key, species descriptions with comments and illustrations, besides the transference of Sebastiania anisodonta and S. salicifolia to the genus Microstachys and a lectotipification.
DOI: 10.6084/m9.figshare.6858287
title: Occurrence of Mormolyca cleistogama (Maxillarinae, Orchidaceae) in São Paulo state, Brazil

description: Abstract Mormolyca cleistogama has its occurrence unknown in São Paulo state, although widely distributed in South America. In this study, based in field collection, we confirmed the occurrence of M. cleistogama in São Paulo state, Brazil. Morphological descriptions, color images and comparison with the closely related taxon, M. rufescens, are presented.
DOI: 10.6084/m9.figshare.6858287.v1
title: Occurrence of Mormolyca cleistogama (Maxillarinae, Orchidaceae) in São Paulo state, Brazil

description: Abstract Mormolyca cleistogama has its occurrence unknown in São Paulo state, although widely distributed in South America. In this study, based in field collection, we confirmed the occurrence of M. cleistogama in São Paulo state, Brazil. Morphological descriptions, color images and comparison with the closely related taxon, M. rufescens, are presented.
DOI: 10.6084/m9.figshare.6858293.v1
title: Validation and Analysis of UV Radiation Time Series Collected in Different Peruvian Sites

description: Abstract We evaluate a set of ultraviolet solar radiation (UVR) measurements collected in six locations in Peru: Ica, Tacna, Moquegua, Arequipa, Cajamarca and Marcapomacocha, whose altitudes vary from sea level to 4479 m. The analysis involved the validation and analysis of the ultraviolet index (UVI) and the daily erythemal doses (D-Er). Clear-sky filtered data were compared with numerical simulations provided by the Tropospheric Ultraviolet and Visible (TUV) radiation model in order to estimate numerical regression equations. These equations showed high determination coefficients (R2 &gt; 0.91) statistical significance (p &lt; 0.0001). Results show that the maximum UVI observed in Peru was 23.5 in Marcapomacocha (4479 m above sea level). Regarding D-Er, the highest means were observed in summer at the city of Arequipa with daily averages closer than 7.9 kJm-2 (± 1.3 kJm-2). However, the highest daily dose was observed in Cajamarca in the fall, with 14.3 kJm-2. These large amounts of high D-Er and very high and extreme UVI episodes indicate an important risk to the development of solar-related skin diseases, as the skin cancers. Our analysis provides a new knowledge on the spatial and temporal UV distribution in Peru and an important tool to justify public policies for solar protection.
DOI: 10.6084/m9.figshare.6858284
title: Síntesis y caracterización de “tanatos” de lantano como inhibidores de la corrosión

description: ABSTRACT Tannins are polyphenols synthesized by plants. They are found in Quebracho (Schinopsis Balansae) wood, Tara (Caesalpinia spinosa) fruits, etc. They have been incorporated in the coating industry as "antifouling" agents and as corrosion inhibitors in acidic solutions. Moreover, lanthanum solutions have a great inhibitory effect over SAE 1010 steel corrosion. The aim of this study was to obtain two types of lanthanum "tannate" with low solubility, so they can be incorporated as corrosion inhibitors in temporary protective coatings, those that protect the metal during transportation and storage. Eventually, they could also be employed in anticorrosive paints. Two types of "tannates" were obtained with two commercial Tara and Quebracho tannins and 0.1M La(NO3)3x 6H2O. The pigments were characterized by Fourrier transformance infra-red spectroscopy (FTIR) and their solubility was determined by the Folin-Denis technique. The protective action of "tanates" on SAE 1010 steel was evaluated by polarization curves and corrosion measurements in NaCl solution. The protective film formed on the steel immersed in the "tannate" suspension was observed by scanning electron microscopy and characterized by dispersive X-ray spectroscopy. Both "tannates" shifted the corrosion potential to more positive values and the polarization resistances were one or two orders of magnitude higher than the controls (solution without inhibitor and different concentration of commercial tannin solutions). On the other hand, the quantification of soluble metal cation and oxidizable material suggests that no premature lixiviation will occur from the coating and they can perform their protective properties for a suitable time.
DOI: 10.6084/m9.figshare.6858284.v1
title: Síntesis y caracterización de “tanatos” de lantano como inhibidores de la corrosión

description: ABSTRACT Tannins are polyphenols synthesized by plants. They are found in Quebracho (Schinopsis Balansae) wood, Tara (Caesalpinia spinosa) fruits, etc. They have been incorporated in the coating industry as "antifouling" agents and as corrosion inhibitors in acidic solutions. Moreover, lanthanum solutions have a great inhibitory effect over SAE 1010 steel corrosion. The aim of this study was to obtain two types of lanthanum "tannate" with low solubility, so they can be incorporated as corrosion inhibitors in temporary protective coatings, those that protect the metal during transportation and storage. Eventually, they could also be employed in anticorrosive paints. Two types of "tannates" were obtained with two commercial Tara and Quebracho tannins and 0.1M La(NO3)3x 6H2O. The pigments were characterized by Fourrier transformance infra-red spectroscopy (FTIR) and their solubility was determined by the Folin-Denis technique. The protective action of "tanates" on SAE 1010 steel was evaluated by polarization curves and corrosion measurements in NaCl solution. The protective film formed on the steel immersed in the "tannate" suspension was observed by scanning electron microscopy and characterized by dispersive X-ray spectroscopy. Both "tannates" shifted the corrosion potential to more positive values and the polarization resistances were one or two orders of magnitude higher than the controls (solution without inhibitor and different concentration of commercial tannin solutions). On the other hand, the quantification of soluble metal cation and oxidizable material suggests that no premature lixiviation will occur from the coating and they can perform their protective properties for a suitable time.
DOI: 10.6084/m9.figshare.6858275
title: Post-harvest quality of ‘Vitória’ pineapple as a function of the types of shoots and age of the plant for floral induction

description: Abstract For the production and quality of pineapple fruits, the appropriate choice of the type of propagule to be used combined with the management of the ages for floral induction are important factors to reach the maximum of desirable characteristics that will define the success in the production of the pineapple and its good acceptance in the market. The objective of this research was to evaluate the post-harvest quality of fruits developed from different types of shoots and ages of floral induction of ‘Vitória’ pineapple. The experiment was carried out in a complete randomized block design with four replications. The plots were made up of the shoots (slip and sucker) and the subplots were composed of the different ages of floral induction (8, 10 and 12 months after planting and natural flowering). Evaluations of biomass characteristics of fruits with and without crown, circumference, length, diameter, firmness, translucency, pulp color and physicochemical quality were performed. No significant interaction was observed for the biometric and biomass variables, and the type of shoots influenced only the crown biomass and the central cylinder diameter, which were higher in the slips. In addition, for the attributes color, translucent area and firmness, no interaction was found, and they were influenced only by the induction times, except for the variable color referring to the intensity of green and red colors. Regardless of the types of the shootss evaluated in the environmental conditions of planting carried out in April 2015, the fruits originated from natural inductions and inductions at 12 months presented greater firmness, a desirable characteristic for export and industrialization, mainly for the processing of slices of pineapple, pieces in syrup and crystallized. The slips natural induced and induced at 12 months provided fruits with a greater ratio between soluble solids and acidity.