A5019177404- Wood Treatment and Properties
- Lignin and Wood Chemistry
- Agricultural and Food Sciences
- Natural Fiber Reinforced Composites
- Forest ecology and management
- Tree Root and Stability Studies
- Wood and Agarwood Research
- Advanced Cellulose Research Studies
- Thermochemical Biomass Conversion Processes
- Plant Surface Properties and Treatments
- Surface Modification and Superhydrophobicity
- biodegradable polymer synthesis and properties
- Biofuel production and bioconversion
- Bamboo properties and applications
- Cultural Heritage Materials Analysis
- Growth and nutrition in plants
- Flame retardant materials and properties
- Phytochemicals and Antioxidant Activities
- Plant Pathogens and Fungal Diseases
- Dyeing and Modifying Textile Fibers
- Nanocomposite Films for Food Packaging
- Polymer composites and self-healing
- Metal Alloys Wear and Properties
- Material Properties and Processing
- Natural product bioactivities and synthesis
Universidade Federal do Paraná
2016-2025
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro
2024
Coordenação de Aperfeicoamento de Pessoal de Nível Superior
2020
Universidade Federal de Santa Maria
2018
Instituto Florestal
2017
Centro Universitário Curitiba
2017
Universidade Federal de Pelotas
2010-2015
Universidade Federal do Rio Grande do Sul
2015
The color modifications in Eucalyptus grandis thermally modified wood were investigated.One hundred eighty specimens (10 x 10 200 mm) prepared and an electric kiln for 4 and8 h at 180-240ºC.The parameters (L*, a*, b*, C*, h* ΔE) determined by the CIE-L*a*b* method on radial tangential sections of untreated treated wood.The results indicated darkening sections.Both showed variation L* between 73 30, a* 9 5 b* 20 8.The 180 200ºC similar patterns, equally 220 240ºC.The time exposure...
The effect of thermal treatments on physical and mechanical properties rose gum Sydney blue wood was evaluated. Wood samples were thermally modified in a combination: pre-treatment an autoclave (127°C - 1h) treatment oven (180-240°C 4h); only at 180-240°C for 4h. Chemical changes the structure woods evaluated through infrared spectroscopy. Evaluation performed mass loss, specific gravity, equilibrium moisture content dimensional stability tests. Surface analyzed apparent contact angle...
Densification parameters were investigated for the fast-growing pine and eucalyptus.Both woods showed optimal results in terms of apparent density mechanical properties when milder treatments 150 °C applied.Pine mass loss improved with a longer heating time 60 min, while eucalypt performed better shorter 30 min.Eucalypt has more highly acetylated hemicelluloses, mainly composed xylose units, which degrade quickly consequent decrease properties.However, densities close to 1.0 g•cm -3...
Tannins, present in all plants, are the most abundant polyphenols world. Their potential as a raw material for modifying wood alongside furfuryl alcohol (FA) has already been demonstrated previous studies. This study focused on using large quantities of hydrolysable tannins from chestnut (Castanea sativa) to replace much FA possible chemically modify beech (Fagus sylvatica L.). Impregnation was carried out different concentrations and ratios both tartaric acid catalysts through...
The present study describes the effect of thermal rectification on physical and mechanical properties Eucalyptus grandis wood at different levels temperature time. Samples (10 × 10 200 mm) were heat-treated 180, 200, 220 240 °C during 4 8 hours. untreated samples determined by static bending tests. weight loss swelling results showed that modulus elasticity, rupture, loss, volumetric linear affected significantly rectification. However, length exposure influenced just while all studied wood....
We investigated the effect of outdoor exposure on wood surface from three fast-growing Brazilian eucalypts through color, wetting and thermal analyzes.Gympie messmate (Eucalyptus cloeziana), rose gum grandis) blue saligna) woods were exposed outdoors in a subtropical region for 360 days.We performed collections every 120 color changes untreated weathered spectrophotometer (CIEL*a*b* system) macro compounds thermogravimetric analysis.In addition, apparent contact angle work adhesion evaluated...
In this study, a strategy was adopted to enhance the use of ramie fibers as raw material for isolation cellulose nanofibers (CNFs). Ramie pulp produced by alkaline organosolv followed bleaching. CNFs were mechanical defibrillation, and films fabricated via casting. Effects number passes in grinding on physical properties CNF comprehensively studied. Potential proved fabricating homogeneous with average thickness 8.72 nm, which led dense non-porous networks, crystallinity index 76-78%....
Background: Determining the basic density of wood is usually defined as a simple process, but it requires caution and operator’s skill to avoid errors in analysis. In addition, involves sample preparation time saturate until obtaining dry mass. The development alternative measurement techniques could reduce obtain results provide reliable values. Therefore, this study aimed develop multivariate models estimate native woods using near-infrared spectra (NIR). Basic densities were determined by...
This study presents a simple and cost-effective approach for synthesizing pyrolytic lignin-based carbon dots (CDPLs) via controlled thermal pyrolysis in water. To the best of our knowledge, this is first time that lignin has been used as precursor dots. The one-pot method produced blue/green fluorescent CDPLs with an average size 34 nm negative surface charge -10.4 mV. characterization techniques revealed optical properties chemical composition CDPLs, fluorescence quantum yield 7.9%, which...
Renewable natural sources have been recently used to produce nanocellulose for the mechanical reinforcement of polymers. Cortaderia selloana (a.k.a. pampas grass) is a worldwide spread grass species, being able grow even at extreme climatic situations, like high temperatures, arid soil and sunny regions. Although it capable offering relatively abundant quantity lignocellulosic material, was not considered before its utilization technological ends. This study proposes protocol chemical...
This study aimed to characterise wood discolouration of three Brazilian eucalypt species exposed the action natural weathering in two distinct places. To achieve this, tests were performed at an outdoor site and under a forest canopy; both located state Rio Grande do Sul, Brazil. Colorimetric measurements every 45 days during period 1 year order obtain parameters L*, a*, b*, C* h*. The main results showed significant darkening first 4 months subsequently increased greyish colour. Colour...
AbstractThis study aimed to evaluate physical and mechanical properties colour changes of fast-growing Gympie messmate wood subjected two-step steam-heat treatments. To achieve this, was thermally treated under different conditions. Combined steam (127°C ∼0,1471 MPa) heat treatments in an oven (180–240°C for 4 hours) were performed. Physical evaluated by weight loss, equilibrium moisture content, specific gravity, volumetric linear swelling static bending tests, while studied using CIEL*a*b*...