cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.14321731
title: Evaluation of physical properties of six forest wood species

description: ABSTRACT This study aims at assessing and correlating physical properties of wood, such as basic specific mass, moisture content, water absorption, loss of mass at 50 ° C and 100 ° C, maximum linear contraction (β), coefficient of contraction anisotropy (Ca β), maximum linear swelling (α) and coefficient of swelling anisotropy (Caα), being analyzed for wood of the following species: Corymbia citriodora, Corymbia maculata, Eucalyptus dunnii, Eucalyptus grandis, Eucalyptus saligna and Eucalyptus tereticornis. For that, 20 mm x 20 mm x 15 mm specimens were prepared. For the physical analyzes, the specimens were submerged in water until saturated, conditioned at a temperature of 20 ° C with relative humidity (RH) of 65% and oven dried (100 ± 3 ° C). Mass data and dimensions of these specimens were collected in each of these stages, for later calculation of the technological properties. It was observed that the wood of the seven species presented significant difference. Analyzing the mass loss properties at 100 ° C and basic specific mass, as well as anisotropy for swelling (Ca α) and contraction (Caβ), they present a significant correlation, being directly proportional. The basic specific mass and water absorption, loss of mass at 100 ° C and water absorption, Coefficient of Contraction Anisotropy (Caβ) and water absorption, showed significant correlations, being these inversely proportional properties. The wood of the genus Corymbia presented average values of technological properties superior to those of the genus Eucalyptus, highlighting the wood Corymbia citriodora.
DOI: 10.6084/m9.figshare.14321733
title: On the encapsulation materials for ion-selective electrodes

description: ABSTRACT Ion-selective electrodes (ISEs) built with chalcogenide glass membranes are sensors capable of detecting heavy metal ions in electrolytic solutions. Using ISEs in-situ and repeatedly can be challenging not only to the sensitive membrane, but to the material used to encapsulate the electrical contact between the membrane and the metallic wire. If the encapsulation fails, the sensor must be discarded. Despite how critical these issues are on this sensor component, no studies on the requirements and selection of the encapsulation material have been reported so far. This material must isolate the electrical contact of the surrounding solution, have a low level of absorption of the solution and the ions in the solution, as well as keep its properties stable in the long-term. The material requirements will also depend on the geometry of the membrane, either bulk or thin film. To stimulate further research and development in the field of ISEs, we investigated five encapsulating materials commercially available in the Latin American region (transparent Poxipol, Vaicel, Wilpox APV 3C, Wilpox Doming P-5 and Araldite CY-248 + HY-956). We analyzed the encapsulation requirements to enable stable and reliable ISEs by evaluating the following properties: viscosity, curing time, hardness, surface quality, formation of bubbles, effect of mechanical polishing, reaction to Ag paint, effect of water, and cleaning and storage solutions. We found that, under the proper conditions, Wilpox APV 3C and Araldite CY-248 + HY-956 epoxy resins are the most suitable materials to encapsulate bulk chalcogenide glass membranes, while Wilpox APV 3C epoxy resin and Vaicel acrylic resin turn out to be the best candidates for thin film membranes.
DOI: 10.6084/m9.figshare.14321733.v1
title: On the encapsulation materials for ion-selective electrodes

description: ABSTRACT Ion-selective electrodes (ISEs) built with chalcogenide glass membranes are sensors capable of detecting heavy metal ions in electrolytic solutions. Using ISEs in-situ and repeatedly can be challenging not only to the sensitive membrane, but to the material used to encapsulate the electrical contact between the membrane and the metallic wire. If the encapsulation fails, the sensor must be discarded. Despite how critical these issues are on this sensor component, no studies on the requirements and selection of the encapsulation material have been reported so far. This material must isolate the electrical contact of the surrounding solution, have a low level of absorption of the solution and the ions in the solution, as well as keep its properties stable in the long-term. The material requirements will also depend on the geometry of the membrane, either bulk or thin film. To stimulate further research and development in the field of ISEs, we investigated five encapsulating materials commercially available in the Latin American region (transparent Poxipol, Vaicel, Wilpox APV 3C, Wilpox Doming P-5 and Araldite CY-248 + HY-956). We analyzed the encapsulation requirements to enable stable and reliable ISEs by evaluating the following properties: viscosity, curing time, hardness, surface quality, formation of bubbles, effect of mechanical polishing, reaction to Ag paint, effect of water, and cleaning and storage solutions. We found that, under the proper conditions, Wilpox APV 3C and Araldite CY-248 + HY-956 epoxy resins are the most suitable materials to encapsulate bulk chalcogenide glass membranes, while Wilpox APV 3C epoxy resin and Vaicel acrylic resin turn out to be the best candidates for thin film membranes.
DOI: 10.6084/m9.figshare.14321736.v1
title: A study on the thermophysiological and tactile comfort properties of silk/lyocell blended fabrics

description: ABSTRACT Certain investigations on the thermophysiological and tactile comfort properties of silk/lyocell blended fabrics have been carried out. A series of yarns were produced as 100% silk (S 100), 75% silk and 25% lyocell (S/L 75:25), 50% silk and 50% lyocell (S/L 50:50), 25% silk and 75% lyocell (S/L 25:75) and 100% lyocell (L 100) and converted to woven fabrics keeping the same fabric set. FTIR study on silk, lyocell and silk/lyocell blended fabrics show the characteristic functional groups for the respective fabrics. The effects of blend compositions on thermophysiological and tactile comfort properties were examined and the results show that thermal resistance of the fabrics containing silk has a higher value in comparison with lyocell-rich blends. Water vapour permeability, absorbency and wickability for lyocell and lyocell-rich blends are found to be superior as compared to 100% silk fabrics. With respect to drape, bending length and crease recovery the lyocell rich fabrics are good in comparison with 100% silk fabrics. The results are discussed using one way ANOVA with 5% significant level.
DOI: 10.6084/m9.figshare.14321736
title: A study on the thermophysiological and tactile comfort properties of silk/lyocell blended fabrics

description: ABSTRACT Certain investigations on the thermophysiological and tactile comfort properties of silk/lyocell blended fabrics have been carried out. A series of yarns were produced as 100% silk (S 100), 75% silk and 25% lyocell (S/L 75:25), 50% silk and 50% lyocell (S/L 50:50), 25% silk and 75% lyocell (S/L 25:75) and 100% lyocell (L 100) and converted to woven fabrics keeping the same fabric set. FTIR study on silk, lyocell and silk/lyocell blended fabrics show the characteristic functional groups for the respective fabrics. The effects of blend compositions on thermophysiological and tactile comfort properties were examined and the results show that thermal resistance of the fabrics containing silk has a higher value in comparison with lyocell-rich blends. Water vapour permeability, absorbency and wickability for lyocell and lyocell-rich blends are found to be superior as compared to 100% silk fabrics. With respect to drape, bending length and crease recovery the lyocell rich fabrics are good in comparison with 100% silk fabrics. The results are discussed using one way ANOVA with 5% significant level.
DOI: 10.6084/m9.figshare.14321737
title: Investigating the use of wastes from the processing of eucalyptus wood for the compacted solid fuels production

description: ABSTRACT This study aimed to analyze the charcoals of bark, shavings and sawdust of Eucalyptus pellita, and the briquettes produced from these materials, carbonized at two temperatures. The bark, shavings and sawdust generated by mechanical processing were charred at temperatures of 400 °C and 600 °C. The physicochemical properties of the charcoals produced were compared with those of the carbonized wood at the same temperatures. Then the charred residues were briquetted and analyzed through equilibrium moisture, apparent specific mass, natural and forced degradation rate. Carbonization of the bark of Eucalyptus pellita wood increased the gravimetric yields in charcoal. There was a positive relationship between the carbonization temperature and the equilibrium moisture of the briquettes produced with the carbonized residues. The briquettes produced with charcoal from the carbonized bark at 400 ºC presented a high rate of thermal degradation.
DOI: 10.6084/m9.figshare.14321737.v1
title: Investigating the use of wastes from the processing of eucalyptus wood for the compacted solid fuels production

description: ABSTRACT This study aimed to analyze the charcoals of bark, shavings and sawdust of Eucalyptus pellita, and the briquettes produced from these materials, carbonized at two temperatures. The bark, shavings and sawdust generated by mechanical processing were charred at temperatures of 400 °C and 600 °C. The physicochemical properties of the charcoals produced were compared with those of the carbonized wood at the same temperatures. Then the charred residues were briquetted and analyzed through equilibrium moisture, apparent specific mass, natural and forced degradation rate. Carbonization of the bark of Eucalyptus pellita wood increased the gravimetric yields in charcoal. There was a positive relationship between the carbonization temperature and the equilibrium moisture of the briquettes produced with the carbonized residues. The briquettes produced with charcoal from the carbonized bark at 400 ºC presented a high rate of thermal degradation.
DOI: 10.6084/m9.figshare.14321739
title: Comparative Study Between Theoretical and Experimental Values of Dimensional Quantities for Tropical Brazilian Wood

description: ABSTRACT Brazil presents many wood species that are very useful in several sectors such as civil construction and furniture industry. Rational use of wood resources depends on the wood characterizations process, that can become easier using equations involving properties of interest. Some theoretical equations found in the literature were developed for primarily softwood from the northern hemisphere, but not checked regarding of their accuracy for tropical Brazilian wood species. This paper aims to confront four theoretical equations with the dimensional stability quantities of fifteen tropical Brazilian woods and test the accuracy of them for these wood species. Results showed that experimental values present greater variability than the ones provided by the theoretical equations. Kruskal-Wallis ANOVA performed showed that one of the four equations cannot be accurately used for tropical Brazilian wood species at 5% significance level.
DOI: 10.6084/m9.figshare.14321739.v1
title: Comparative Study Between Theoretical and Experimental Values of Dimensional Quantities for Tropical Brazilian Wood

description: ABSTRACT Brazil presents many wood species that are very useful in several sectors such as civil construction and furniture industry. Rational use of wood resources depends on the wood characterizations process, that can become easier using equations involving properties of interest. Some theoretical equations found in the literature were developed for primarily softwood from the northern hemisphere, but not checked regarding of their accuracy for tropical Brazilian wood species. This paper aims to confront four theoretical equations with the dimensional stability quantities of fifteen tropical Brazilian woods and test the accuracy of them for these wood species. Results showed that experimental values present greater variability than the ones provided by the theoretical equations. Kruskal-Wallis ANOVA performed showed that one of the four equations cannot be accurately used for tropical Brazilian wood species at 5% significance level.
DOI: 10.6084/m9.figshare.14321742.v1
title: Recycling of cliche waste from flexography printing for production of composites with applications for acoustic and thermal insulation

description: ABSTRACT Flexography is a widely used method in flexible packaging printing, where the cliche is a resilient photopolymerized printing plate. Cliches are difficultly recycled, because they acquire a crosslinked molecular structure. This also generates serious environmental problems in the final discard, as soon as, it has an indeterminate period of decomposition. Companies need grounding the cliches after their lifetime. Currently, there are no products or methods for recycling of this material. Therefore, the aim of this work is the recycle of cliche waste for the production of plates for thermal and acoustic insulation. A method of comminution of the material with suitable particle size was developed. Composites produced with cliche and PET by means of press molding at 350°C, obtained high flexibility and elongation of 22% until rupture. Up to 90% of the cliche can be useful in the compositions studied. Thermal insulation of the composite was 18% lower than of a laminated wood plate with similarly thick. For other hand, acoustic insulation has increased by 30% with the composite plates, especially in the frequency range above 2 kHz, showing to a potential insulation application.
DOI: 10.6084/m9.figshare.14321742
title: Recycling of cliche waste from flexography printing for production of composites with applications for acoustic and thermal insulation

description: ABSTRACT Flexography is a widely used method in flexible packaging printing, where the cliche is a resilient photopolymerized printing plate. Cliches are difficultly recycled, because they acquire a crosslinked molecular structure. This also generates serious environmental problems in the final discard, as soon as, it has an indeterminate period of decomposition. Companies need grounding the cliches after their lifetime. Currently, there are no products or methods for recycling of this material. Therefore, the aim of this work is the recycle of cliche waste for the production of plates for thermal and acoustic insulation. A method of comminution of the material with suitable particle size was developed. Composites produced with cliche and PET by means of press molding at 350°C, obtained high flexibility and elongation of 22% until rupture. Up to 90% of the cliche can be useful in the compositions studied. Thermal insulation of the composite was 18% lower than of a laminated wood plate with similarly thick. For other hand, acoustic insulation has increased by 30% with the composite plates, especially in the frequency range above 2 kHz, showing to a potential insulation application.
DOI: 10.6084/m9.figshare.14321743
title: Microstructural development and oxygen ion mobility in Sr, Ba, and Ca-doped LaAlO3 perovskites

description: ABSTRACT Perovskite-type materials have been extensively investigated in the attempt to find new electrolyte materials for Solid Oxide Fuel Cell that work at low temperatures. Among these materials, LaAlO3 stands out for presenting considerable ionic conductivity when adequately doped. In this work, pure and Sr, Ba, and Ca-doped LaAlO3 were studied. The powders were prepared by solid state reaction. Microstructural, structural and electrical conductivity of sintered samples were analyzed by scanning electron microscopy, X-ray diffraction and impedance spectroscopy, respectively. Among the different kinds of dopants, Sr-doped sample presented the higher conductivity, for both the grain ( at 800°C) and total ( at 800°C) conductivity. In all doped samples, the total conductivity is controlled by the grain boundary, i.e., the grain boundary is more resistive than the grain, and the microstructures are heterogeneous and the degree of heterogeneity is determined by the dopant.
DOI: 10.6084/m9.figshare.14321743.v1
title: Microstructural development and oxygen ion mobility in Sr, Ba, and Ca-doped LaAlO3 perovskites

description: ABSTRACT Perovskite-type materials have been extensively investigated in the attempt to find new electrolyte materials for Solid Oxide Fuel Cell that work at low temperatures. Among these materials, LaAlO3 stands out for presenting considerable ionic conductivity when adequately doped. In this work, pure and Sr, Ba, and Ca-doped LaAlO3 were studied. The powders were prepared by solid state reaction. Microstructural, structural and electrical conductivity of sintered samples were analyzed by scanning electron microscopy, X-ray diffraction and impedance spectroscopy, respectively. Among the different kinds of dopants, Sr-doped sample presented the higher conductivity, for both the grain ( at 800°C) and total ( at 800°C) conductivity. In all doped samples, the total conductivity is controlled by the grain boundary, i.e., the grain boundary is more resistive than the grain, and the microstructures are heterogeneous and the degree of heterogeneity is determined by the dopant.
DOI: 10.6084/m9.figshare.14321745
title: Effects of rice husk ash and wollastonite incorporation on the physical and thermal properties of refractory ceramic composites

description: ABSTRACT The main objective of this work was to evaluate the effects of rice husk ash and wollastonite microfibers incorporation, added per clay partial substituition, on physical and thermal properties of refractory ceramic composites. The raw materials characterization occurred with respect to their chemical composition (XRF), phase composition (XRD) and granulometry by laser. The composites were avaluated by physical properties - apparent porosity, bulk density, water absorption, linear retraction after sinterization and mass variation - and thermal properties - thermal conductivity and thermal shock. The rice husk ash used in the present work proved to have potential as a ceramic precursor in the development of refractories. The clay substitution per ash and the microfiber different percentages resulted in an increase in water absorption and apparent porosity and a reduction in the linear retraction. The increase in porosity suggests that the mullitization was insufficient. Regarding the thermal performance, the thermal conductivity was inversely proportional to the porosity and the microfiber percentage. In addition, the higher the thermal-shock temperature gradient the lower was the number of cycles resisted by the composites.
DOI: 10.6084/m9.figshare.14321745.v1
title: Effects of rice husk ash and wollastonite incorporation on the physical and thermal properties of refractory ceramic composites

description: ABSTRACT The main objective of this work was to evaluate the effects of rice husk ash and wollastonite microfibers incorporation, added per clay partial substituition, on physical and thermal properties of refractory ceramic composites. The raw materials characterization occurred with respect to their chemical composition (XRF), phase composition (XRD) and granulometry by laser. The composites were avaluated by physical properties - apparent porosity, bulk density, water absorption, linear retraction after sinterization and mass variation - and thermal properties - thermal conductivity and thermal shock. The rice husk ash used in the present work proved to have potential as a ceramic precursor in the development of refractories. The clay substitution per ash and the microfiber different percentages resulted in an increase in water absorption and apparent porosity and a reduction in the linear retraction. The increase in porosity suggests that the mullitization was insufficient. Regarding the thermal performance, the thermal conductivity was inversely proportional to the porosity and the microfiber percentage. In addition, the higher the thermal-shock temperature gradient the lower was the number of cycles resisted by the composites.
DOI: 10.6084/m9.figshare.14321748.v1
title: Static bending of glulam beams manufactured with rubber wood and epoxy adhesive

description: ABSTRACT The aim of this study was to evaluate the properties of Hevea brasiliensis wood wastes for production structural pieces of glued laminated (glulam) timber. Three trees with age close to 25 years and diameter at breast height (DBH) higher than 500 mm were obtained. The basic density of the wood were quantified, as well as the stiffness and the strength in static bending, shear strength and parallel compression to grain and hygroscopic equilibrium moisture. The beams of glulam were evaluated according to the modulus of elasticity (MOE), modulus of rupture (MOR) and delamination. Due to the bending properties MOR (75.14 MPa) and MOE (8166.79 MPa), as well as the shear strength (12.29 MPa) obtained, was concluded by the suitability of the rubber wood for the production of glulam beams. The composite beams presented values of MOR (75.14 MPa) and MOE (8166.79 MPa) compatible with species traditionally used in the production of glulam beams. The adhesive bond quality was verified by the delamination test, presenting delamination of 4.95 %, indicating its use for internal and external environments.
DOI: 10.6084/m9.figshare.14321748
title: Static bending of glulam beams manufactured with rubber wood and epoxy adhesive

description: ABSTRACT The aim of this study was to evaluate the properties of Hevea brasiliensis wood wastes for production structural pieces of glued laminated (glulam) timber. Three trees with age close to 25 years and diameter at breast height (DBH) higher than 500 mm were obtained. The basic density of the wood were quantified, as well as the stiffness and the strength in static bending, shear strength and parallel compression to grain and hygroscopic equilibrium moisture. The beams of glulam were evaluated according to the modulus of elasticity (MOE), modulus of rupture (MOR) and delamination. Due to the bending properties MOR (75.14 MPa) and MOE (8166.79 MPa), as well as the shear strength (12.29 MPa) obtained, was concluded by the suitability of the rubber wood for the production of glulam beams. The composite beams presented values of MOR (75.14 MPa) and MOE (8166.79 MPa) compatible with species traditionally used in the production of glulam beams. The adhesive bond quality was verified by the delamination test, presenting delamination of 4.95 %, indicating its use for internal and external environments.