cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.7452197
title: Nano-roughness on PEAD polymer produced through N2/O2 RF plasma

description: ABSTRACT HDPE films were treated in the post-discharge region of N2/O2 plasma, powered by a radio frequency power supply. Therefore, in this paper, it was investigated the role of pressure in molding the nano-topography of the polymer. The treatment was carried out in low temperature (T &lt;40 ° C) and time of 5.0 min, in order to preserve the integrity of the polymer bulk. It is well known that the production and recombination rate of reactive species in the plasma depends on the working gas pressure. Results show that the surface nano-roughness is very sensitive to pressure, between 0.01Torr and 0.5Torr, making it possible to use as a fine control parameter for polymer nano-texturing. In the lower pressure treatment it was observed regular nano-peaks and nano-troughs on the surface of the sample. Contact angle measurements show that, in general, the surface becomes hydrophilic after N2/O2 plasma treatment. In addition, samples treated in higher pressure generate oxidized islands by the action of the oxidizing plasma. All samples became more hydrophilic after plasma treatment, maintaining this hydrophilicity characteristic for several days.
DOI: 10.6084/m9.figshare.7452200
title: Evolution of soluble solid content and evaporation rate curves during the manufacture of dulce de leche (dl)

description: Abstract Dulce de leche is an evaporated dairy product that can be manufactured in different types of pots or pans. The manufacturing endpoint for dulce de leche can be determined by measuring the soluble solids content. We investigated the evaporation rates and the evaporative capacity of atmospheric pressure evaporators (pans) during the manufacture of dulce de leche. During manufacturing, four different formulations were subjected to soluble solids content determination by refractometry. In addition, the mass balance was used to determine the yield and evaporation rate. A low coefficient of variation and amplitude was found for soluble solids content, indicating standardization and uniformity during fabrication. We also observed a gradual increase in the latter throughout manufacture, without significant differences between the times. The evaporated water mass rate and its respective equation allow to reproduce the same characteristics of the experimental product in experimental and industrial production of dulce de leche.
DOI: 10.7284/101831
title: GNSS (Global Navigation Satellite System) data collected during research cruise MV1009 using a Furuno GP-90D instrument system onboard the platform RV Melville

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7452194
title: Mechanical properties and morphological characteristics of ARALL reinforced with TRGO doped epoxy resin

description: ABSTRACT Mechanical properties in tension, bending, fatigue and lap-shear in two different proportions (0.5%wt and 1%wt) of TRGO (Thermally Reduced Graphite Oxide) doped ARALL (Aramid Aluminium Laminate) were examined. The materials and their failure modes were characterized morphologically by examination through SEM (Scanning Electron Microscopy). Some mechanical properties of ARALL were improved when doped with 0.5% of TRGO, showing a significant increase of fatigue properties, as well as a change in fracture surface morphology. Tension andbending properties showed variable results and further studies should be carried out to arrive to definitive conclusions, while lap-shear testing showed lower shear values. The results were statistically validated through mono-factorial variance analysis. Comparing the present results with previous work on CNT (Carbon Nanotubes) doped ARALL, it can be stated that: (a) TRGO doped ARALL showed improved fatigue properties when compared with non-doped ARALL, but in a less effective way than doping with CNT, (b) TRGO doped ARALL tension properties showed no significant variation as compared with ARALL alone, showing no deleterious influence as in the CNT doping case, (c) TRGO doped ARALL bending properties resulted better than non-doped ARALL, but similar than those obtained when doping with CNT and (d) TRGO decreased the adherence between aramid fiber impregnated L20 epoxy resin and aluminium. These last results are sustained based on observed improvements as a percentage value, without a statistical variance analysis made on CNT doped ARALL.
DOI: 10.6084/m9.figshare.7452197.v1
title: Nano-roughness on PEAD polymer produced through N2/O2 RF plasma

description: ABSTRACT HDPE films were treated in the post-discharge region of N2/O2 plasma, powered by a radio frequency power supply. Therefore, in this paper, it was investigated the role of pressure in molding the nano-topography of the polymer. The treatment was carried out in low temperature (T &lt;40 ° C) and time of 5.0 min, in order to preserve the integrity of the polymer bulk. It is well known that the production and recombination rate of reactive species in the plasma depends on the working gas pressure. Results show that the surface nano-roughness is very sensitive to pressure, between 0.01Torr and 0.5Torr, making it possible to use as a fine control parameter for polymer nano-texturing. In the lower pressure treatment it was observed regular nano-peaks and nano-troughs on the surface of the sample. Contact angle measurements show that, in general, the surface becomes hydrophilic after N2/O2 plasma treatment. In addition, samples treated in higher pressure generate oxidized islands by the action of the oxidizing plasma. All samples became more hydrophilic after plasma treatment, maintaining this hydrophilicity characteristic for several days.
DOI: 10.6084/m9.figshare.7452200.v1
title: Evolution of soluble solid content and evaporation rate curves during the manufacture of dulce de leche (dl)

description: Abstract Dulce de leche is an evaporated dairy product that can be manufactured in different types of pots or pans. The manufacturing endpoint for dulce de leche can be determined by measuring the soluble solids content. We investigated the evaporation rates and the evaporative capacity of atmospheric pressure evaporators (pans) during the manufacture of dulce de leche. During manufacturing, four different formulations were subjected to soluble solids content determination by refractometry. In addition, the mass balance was used to determine the yield and evaporation rate. A low coefficient of variation and amplitude was found for soluble solids content, indicating standardization and uniformity during fabrication. We also observed a gradual increase in the latter throughout manufacture, without significant differences between the times. The evaporated water mass rate and its respective equation allow to reproduce the same characteristics of the experimental product in experimental and industrial production of dulce de leche.
DOI: 10.6084/m9.figshare.7452191
title: Pycnoporus sanguineus fungus as wood biopulping

description: ABSTRACT The objective of this study was to evaluate lignin removal efficiency of three eucalypt species through Pycnoporus sanguineus fungus inoculation. The wood samples were inoculated at different periods: 30, 60 and 90 days. To verify the efficiency of the delignification caused by the fungus were quantified: mass loss, extractives, acid insoluble lignin and morphological modification of inoculated and not inoculated fiber. The results showed that Eucalyptus globulus wood in the 90day period was the most promising for fungal pretreatment, where delignification occurred the most. In general, it was possible to concude that the fungus Pycnoporus sanguineus is efficient in the degradation of lignin, which makes it a potential process for the pulp and paper industry, which desires the removal of these polymers always aiming at the most economical production and environmental feasible.
DOI: 10.6084/m9.figshare.7452194.v1
title: Mechanical properties and morphological characteristics of ARALL reinforced with TRGO doped epoxy resin

description: ABSTRACT Mechanical properties in tension, bending, fatigue and lap-shear in two different proportions (0.5%wt and 1%wt) of TRGO (Thermally Reduced Graphite Oxide) doped ARALL (Aramid Aluminium Laminate) were examined. The materials and their failure modes were characterized morphologically by examination through SEM (Scanning Electron Microscopy). Some mechanical properties of ARALL were improved when doped with 0.5% of TRGO, showing a significant increase of fatigue properties, as well as a change in fracture surface morphology. Tension andbending properties showed variable results and further studies should be carried out to arrive to definitive conclusions, while lap-shear testing showed lower shear values. The results were statistically validated through mono-factorial variance analysis. Comparing the present results with previous work on CNT (Carbon Nanotubes) doped ARALL, it can be stated that: (a) TRGO doped ARALL showed improved fatigue properties when compared with non-doped ARALL, but in a less effective way than doping with CNT, (b) TRGO doped ARALL tension properties showed no significant variation as compared with ARALL alone, showing no deleterious influence as in the CNT doping case, (c) TRGO doped ARALL bending properties resulted better than non-doped ARALL, but similar than those obtained when doping with CNT and (d) TRGO decreased the adherence between aramid fiber impregnated L20 epoxy resin and aluminium. These last results are sustained based on observed improvements as a percentage value, without a statistical variance analysis made on CNT doped ARALL.
DOI: 10.7284/101832
title: GNSS (Global Navigation Satellite System) data collected during research cruise MV1009 using a Ashtech ADU2 instrument system onboard the platform RV Melville

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7452188
title: Plasticity in the shape and growth pattern of asteriscus otolith of black prochilodus Prochilodus nigricans (Teleostei: Characiformes: Prochilodontidae) freshwater Neotropical migratory fish

description: ABSTRACT Using morphometric measurements and wavelets functions, the asterisci otoliths of curimatã, Prochilodus nigricans were analysed to identify the variation in shape and growth increment of individuals from Solimões, Japurá and Negro rivers of the Amazon basin, Brazil. The morphometric and morphological analyses did not reveal evidences of population segregation among rivers, but variations were found in the estimation of otolith growth increment. Also, the otolith shape showed a high variability between individuals, identifying four morphotypes. Morphotype 1 shows a more oval shape with a posterior zone clearly rounded; Morphotype 2 shows the posterior zone rounded, but the anterior end is more elongated; Morphotype 3 shows a completely different shape, elliptic-pentagonal and Morphotype 4 shows the posterior zone rounded, but the anterior end is more elongated and it is the pattern with antirostrum and rostrum more pointed and a deep notch. Therefore, the otolith shape exhibited a phenotypic plasticity that it was not associated with the metabolism of otolith growth. Whereas the otolith shape indicated a homogeneity in the sound perception through Amazon basin, the growth rates revealed an adaptive mechanism to environmental conditions or migratory process of this species.
DOI: 10.6084/m9.figshare.7452188.v1
title: Plasticity in the shape and growth pattern of asteriscus otolith of black prochilodus Prochilodus nigricans (Teleostei: Characiformes: Prochilodontidae) freshwater Neotropical migratory fish

description: ABSTRACT Using morphometric measurements and wavelets functions, the asterisci otoliths of curimatã, Prochilodus nigricans were analysed to identify the variation in shape and growth increment of individuals from Solimões, Japurá and Negro rivers of the Amazon basin, Brazil. The morphometric and morphological analyses did not reveal evidences of population segregation among rivers, but variations were found in the estimation of otolith growth increment. Also, the otolith shape showed a high variability between individuals, identifying four morphotypes. Morphotype 1 shows a more oval shape with a posterior zone clearly rounded; Morphotype 2 shows the posterior zone rounded, but the anterior end is more elongated; Morphotype 3 shows a completely different shape, elliptic-pentagonal and Morphotype 4 shows the posterior zone rounded, but the anterior end is more elongated and it is the pattern with antirostrum and rostrum more pointed and a deep notch. Therefore, the otolith shape exhibited a phenotypic plasticity that it was not associated with the metabolism of otolith growth. Whereas the otolith shape indicated a homogeneity in the sound perception through Amazon basin, the growth rates revealed an adaptive mechanism to environmental conditions or migratory process of this species.
DOI: 10.6084/m9.figshare.7452191.v1
title: Pycnoporus sanguineus fungus as wood biopulping

description: ABSTRACT The objective of this study was to evaluate lignin removal efficiency of three eucalypt species through Pycnoporus sanguineus fungus inoculation. The wood samples were inoculated at different periods: 30, 60 and 90 days. To verify the efficiency of the delignification caused by the fungus were quantified: mass loss, extractives, acid insoluble lignin and morphological modification of inoculated and not inoculated fiber. The results showed that Eucalyptus globulus wood in the 90day period was the most promising for fungal pretreatment, where delignification occurred the most. In general, it was possible to concude that the fungus Pycnoporus sanguineus is efficient in the degradation of lignin, which makes it a potential process for the pulp and paper industry, which desires the removal of these polymers always aiming at the most economical production and environmental feasible.
DOI: 10.6084/m9.figshare.7452179
title: Process of chemistry recycling of PET in alkaline medium: effect of concentration of hydroxide ion, color of PET and reaction time

description: ABSTRACT This work investigated the chemical hydrolysis process of polyethylene terephthalate (PET) in alkaline medium; specifically, colorless and colored post-consume bottles. The chemical recycling of post-consume PET bottles is still very little explored in Brazil, not being so different from what is being practiced in other countries. Among possible variables of investigation, in this work was studied the sodium hydroxide (NaOH) concentration and the PET color. The post-consume PETdepolymerization reaction was performed at the concentrations of 1.0, 3.0, 5.0, 7.5 and 10.0 mol L-1 NaOH, and in 7.5 mol L-1was the one that showed the best results, regarding the extent of the reaction and the purity of the recovered monomer, terephthalic acid (TPA). The reaction was also made for PET of different colors at the concentration of 7.5 mol L-1 NaOH, whose results showed a lower performance when compared to those obtained for non-colored PET. This result suggests that it is due to the presence of dyes, which, due to their same chemical structure, compete for nucleophilic attack of the hydroxyl ion (OH-) during the hydrolysis reactionof of PET. Infrared Spectrophotometry (FTIR), X-ray diffraction (XRD), as well as Thermogravimetric (TGA / DTG) analysis confirmed that the reaction products resulted in TPA, since the spectra were coincident with those of the commercial TPA. The increasing consumption of PET packaging and aleatory environmental disposal need quick solutions; the results of this work are important and corroborate with the advance of the research for reutilization of raw material.
DOI: 10.6084/m9.figshare.7452182
title: Influence of reaction temperature on the generation of gels during EVA production in tubular reactor

description: ABSTRACT The fouling formation in the EVA production leads to an increase in the residence time of the material. This result is a favorable condition to generation of the crosslinks during the polymerization. The crosslinking allows raising the molar mass of the polymer, which after the polymerization reaction are characterized as gels, thus generating problems in the product quality during production due to contamination of the resin. This paper describes the fouling process in the reactor, the defouling mechanism, the crosslinking, the scission of chain and presents a study on the influence of the reaction temperature in relation to the formation of gels by quantitative analysis by Optical Controller System -OCS. The average temperature rise of the reaction at 10 ºC, helped to reduce the generation of gels due to the viscosity reduction over the reactor, which reduces the polymer residence time in the walls of the tube and consequently the formation of fouling.
DOI: 10.6084/m9.figshare.7452185
title: Influence of the alumina synthesized by combustion reaction on the properties of composites with polypropylene matrix

description: ABSTRACT Polypropylene (PP) is one of the most used polymers in manufactured products in plastics, therefore, studies on composites have been carried out in an attempt to modify its properties and further extend its use. The aim of this work was to use alumina synthesized by combustion reaction in the laboratory and to evaluate its influence in concentrations of 1, 3 and 5 parts per hundred of resin (phr) in the properties of composites with PP matrix. PP/alumina composites where prepared by extrusion followed by injection molding and characterized by X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) Scanning Electron Microscopy (SEM), mechanical properties (tensile and impact strength tests), flammability and rheological behavior underoscillatory shear flow. XRD results showed that the synthesized alumina has a crystalline structure of the corundum type and when mixed with PP was not affected crystalline structure of PP, however, the addition of alumina to PP led to a decrease in its crystallinity, a result also confirmed by DSC. The thermal transitions (Tm and Tc) of PP were practically unchanged in the composites. In the evaluation of the mechanical properties, the modulus increased and tensile strength and impact decreased, which was attributed to the formation of agglomerates observed in SEM. In the flammability test, the alumina delayed the burning process of the composites and contributed to reduce the emission of smoke and dripping when compared to neat PP. In the rheological analysis the PP and the composites presented a shear thinning behavior and, in the composites, the increase of the alumina concentration promoted reduction in the viscosity. The storage modulus of the composites increased with the alumina concentration, corroborating the results of the mechanical properties.
DOI: 10.6084/m9.figshare.7452182.v1
title: Influence of reaction temperature on the generation of gels during EVA production in tubular reactor

description: ABSTRACT The fouling formation in the EVA production leads to an increase in the residence time of the material. This result is a favorable condition to generation of the crosslinks during the polymerization. The crosslinking allows raising the molar mass of the polymer, which after the polymerization reaction are characterized as gels, thus generating problems in the product quality during production due to contamination of the resin. This paper describes the fouling process in the reactor, the defouling mechanism, the crosslinking, the scission of chain and presents a study on the influence of the reaction temperature in relation to the formation of gels by quantitative analysis by Optical Controller System -OCS. The average temperature rise of the reaction at 10 ºC, helped to reduce the generation of gels due to the viscosity reduction over the reactor, which reduces the polymer residence time in the walls of the tube and consequently the formation of fouling.
DOI: 10.7284/101833
title: Gravimeter data collected during research cruise MV1009 using a Bell BGM-3 instrument system onboard the platform RV Melville

description: Original (unprocessed) data collected during a Field_expedition
DOI: 10.6084/m9.figshare.7452179.v1
title: Process of chemistry recycling of PET in alkaline medium: effect of concentration of hydroxide ion, color of PET and reaction time

description: ABSTRACT This work investigated the chemical hydrolysis process of polyethylene terephthalate (PET) in alkaline medium; specifically, colorless and colored post-consume bottles. The chemical recycling of post-consume PET bottles is still very little explored in Brazil, not being so different from what is being practiced in other countries. Among possible variables of investigation, in this work was studied the sodium hydroxide (NaOH) concentration and the PET color. The post-consume PETdepolymerization reaction was performed at the concentrations of 1.0, 3.0, 5.0, 7.5 and 10.0 mol L-1 NaOH, and in 7.5 mol L-1was the one that showed the best results, regarding the extent of the reaction and the purity of the recovered monomer, terephthalic acid (TPA). The reaction was also made for PET of different colors at the concentration of 7.5 mol L-1 NaOH, whose results showed a lower performance when compared to those obtained for non-colored PET. This result suggests that it is due to the presence of dyes, which, due to their same chemical structure, compete for nucleophilic attack of the hydroxyl ion (OH-) during the hydrolysis reactionof of PET. Infrared Spectrophotometry (FTIR), X-ray diffraction (XRD), as well as Thermogravimetric (TGA / DTG) analysis confirmed that the reaction products resulted in TPA, since the spectra were coincident with those of the commercial TPA. The increasing consumption of PET packaging and aleatory environmental disposal need quick solutions; the results of this work are important and corroborate with the advance of the research for reutilization of raw material.
DOI: 10.6084/m9.figshare.7452185.v1
title: Influence of the alumina synthesized by combustion reaction on the properties of composites with polypropylene matrix

description: ABSTRACT Polypropylene (PP) is one of the most used polymers in manufactured products in plastics, therefore, studies on composites have been carried out in an attempt to modify its properties and further extend its use. The aim of this work was to use alumina synthesized by combustion reaction in the laboratory and to evaluate its influence in concentrations of 1, 3 and 5 parts per hundred of resin (phr) in the properties of composites with PP matrix. PP/alumina composites where prepared by extrusion followed by injection molding and characterized by X-Ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) Scanning Electron Microscopy (SEM), mechanical properties (tensile and impact strength tests), flammability and rheological behavior underoscillatory shear flow. XRD results showed that the synthesized alumina has a crystalline structure of the corundum type and when mixed with PP was not affected crystalline structure of PP, however, the addition of alumina to PP led to a decrease in its crystallinity, a result also confirmed by DSC. The thermal transitions (Tm and Tc) of PP were practically unchanged in the composites. In the evaluation of the mechanical properties, the modulus increased and tensile strength and impact decreased, which was attributed to the formation of agglomerates observed in SEM. In the flammability test, the alumina delayed the burning process of the composites and contributed to reduce the emission of smoke and dripping when compared to neat PP. In the rheological analysis the PP and the composites presented a shear thinning behavior and, in the composites, the increase of the alumina concentration promoted reduction in the viscosity. The storage modulus of the composites increased with the alumina concentration, corroborating the results of the mechanical properties.