A5036788938- Natural Fiber Reinforced Composites
- Textile materials and evaluations
- Advanced Cellulose Research Studies
- Lignin and Wood Chemistry
- Wood Treatment and Properties
- Nanocomposite Films for Food Packaging
- Additive Manufacturing and 3D Printing Technologies
- biodegradable polymer synthesis and properties
- Mechanical Behavior of Composites
- Wood and Agarwood Research
- Architecture and Computational Design
- Fermentation and Sensory Analysis
- Material Properties and Processing
- Phytochemicals and Antioxidant Activities
- Bamboo properties and applications
- Surface Modification and Superhydrophobicity
- Structural Analysis of Composite Materials
- Polymer composites and self-healing
- Hygrothermal properties of building materials
- Flame retardant materials and properties
- Building materials and conservation
- Acoustic Wave Phenomena Research
- Hops Chemistry and Applications
- Infection Control and Ventilation
- Forest Ecology and Biodiversity Studies
Université de Lorraine
2011-2024
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2023
University of Douala
2023
Laboratoire d'Etude et de Recherche sur le Matériau Bois
2010-2021
CeNTI (Portugal)
2020
To substitute synthetic fibers, which are non-biodegradable and environmentally unfriendly, studies have been carried out to exploit vegetable fibers. Within this concept, work investigates Sida rhombifolia as a case study. Previous showed that the fibers could be extracted only by cold water retting, but study seeks show boiling extraction technique can also used. The objective of is characterize from Center region Cameroon, with water, compare their physico-chemical mechanical properties...
This article presents new research on producing lignin nanoparticles (LNPs) using the antisolvent nanoprecipitation method. Acetone (90%) served as solvent and water (100%) antisolvent, five types of lignins from various sources. Comprehensive characterization techniques, including NMR, GPC, FTIR, TEM, DLS, were employed to assess both LNP properties. The antioxidant activity LNPs was evaluated well. results demonstrated successful formation spherical below 100 nm with initial concentrations...
Chestnut hydrolysable tannins are phenolic materials that have been considered too unreactive to compete in the resin adhesives market for exterior boards building industry. However, an article 1973 describing 3 years industrial application of chestnut during first oil crisis indicated this was not case. We extended old work by using superior resins formulations and producing phenol–formaldehyde–chestnut tannin where a substitution up 80% phenol is possible with remarkably good results. The...
In an attempt to increase biodiversity in natural plant fiber nonwovens, new sources of fibers must be discovered. Nonwoven fabric is a promising commercial product for upgrading the bast Triumfetta cordifolia (TCF) and giving it opportunity used composite nonwoven applications. Two types TCF mats blended with polylactide one polypropylene other at mass ratio 50 : were manufactured using carding needling technology. The aim present work compare different TCF-based nonwovens based on fibers,...
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Fine hemp fibers (cottonized hemp) were processed using steam explosion. The quantification of the defibration rate was performed by image processing. Based on this method, optimized a response surface methodology based three-variable central composite design for production elementary with low variability. Optimal parameters processes as follows: time = 4.1 min; temperature 191℃. Biomass impregnated solution NaOH (8%) before treatment, leading to 91.2%, which is producing ≈50% length <3...
Low molecular mass acetylated organosolv lignin from wheat straw and depolymerised low sulphur wood have been shown to markedly improve both the water resistance mechanical performance of welded dowel joints. The oligomers distribution extent acetylation two lignins were determined by Matrix assisted laser desorption ionization-time-of-flight spectrometry. Extensive was confirmed CP-MAS 13C NMR Force–displacement measurements on joints which added showed a ductile behaviour. This is due...
The project consists in the implementation of a biocomposite based on tannin resin and natural rubber matrices with bast fibres Triumfetta cordifolia A.Rich."Okong" from equatorial region Cameroon as reinforcement. A study this still little known fibre is necessary. This paper evaluates physico-chemical mechanical characteristics fibers. fibers are extracted by us. series experiments conducted for purpose: morphological observation scanning electron microscope (SEM); density evaluation...
The use of bioresourced packaging materials is an interesting solution for ecological issues. This work aimed to develop novel chitosan-based reinforced with hemp fibers (HF). For this purpose, chitosan (CH) films were filled 15%, 30%, and 50% (w/w) two kinds HF: Untreated cut 1 mm (UHF) steam exploded (SEHF). effect HF addition treatments on composites was studied in terms mechanical properties (tensile strength (TS), elongation at break (EB), Young’s modulus (YM)), barrier (water vapor...
Numerical models using a 3-D finite element analysis method and the behaviour of dowel-welded wood joints are presented. Simulation results for step butt with two welded dowels under shear analyzed good agreement experimental is shown. Anisotropic elasto-plastic constitutive law hardening associated material densification, without distinction between radial tangential properties, was used compressive wood. The coherence obtained demonstrates clearly capability model developed to simulate...
The characterization of fibers extracted from leaflet, the empty fruit bunches, leaf sheath, and spath palm tree was performed. were using three different procedures through chemical /or enzymatic methods. raw studied have xylose contents between 13-22% glucose content 30% 45%. microfibrillar angle (MFA) values are in order: bunch > sheath >> leaflet. Spath which naturally occur a woven form present poor mechanical strength but could be readily used to produce cheap composites. Leaflet date...
The Piptadeniastrum Africanum bark tannin extract was characterized using MALDI TOF, ATR-FT MIR. It used in the development of a resin with Vachellia nilotica as biohardener. This is consisting Catec... | Find, read and cite all research you need on Tech Science Press
The aim of this study is to chemically, physically, and mechanically characterize Grewia bicolor (GB) fibers harvested in the NGONG locality located North Cameroon region for potential use elaboration tannin matrix composites. are extracted from three zones stem (top (T), middle (M), bottom (B)) by biological retting with stagnant water, various standard norms respected different tests. Analysis Fourier transform infrared spectroscopy (FTIR) chemical composition show that GB consist mainly...
Abstract Comparison of three types furniture joints such as scarf joints, step butt and dovetail held together either by one or two welded dowels, glued dowels steel nails showed that the always gave better shear strength greater stiffness than nails. The results dowel were found to be comparable. application joint technique where number is limited narrow space in which they can applied, furniture, give comparable those obtained gluing same dowels. Keywords: WOOD WELDINGFURNITURE JOINTSSCARF...
Dowel insertion rates whether accelerating or constant are determining parameters for the tensile strength of welded dowel joints. at acceleration up to 4–7 m/s2 appears yield best results lower speed, characteristic welding by manual drills. Strength joints 24 mm depths 2700 N/mm2 have been obtained. Constant appear instead when rate is much higher and can be better controlled, as it case a computer controlled equipment. 4700 obtained 18–20 mm/s time short 1.2 s. The indicate that low...
Holding wood pieces together by rotationally welded dowels can be used to make blockboard panels with the inserted in side of substrate slats. The average results for both tensile and three-point bending tests indicate that a 20° dowel insertion angle yields strength better than 10° 0° angles. Applied load vs deformation two types showed panel stiffness was greater angle.
Abstract Holding wood pieces together by rotationally welded dowels can be used to make blockboard panels with the inserted in side of substrate slats. Pre-oiling sunflower oil: (i) eases their insertion pre-drilled substrate, (ii) allows a much greater depth its lubricating action for welding, thus allowing more layers joined and (iii) provides an improved water resistance joint. The strength joints prepared this system is comparable those already obtained other dowel systems but...