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Physical and Chemical Properties of Horns Sheaths Particles for the Manufacture of Composite Materials

Journal of Materials Science and Chemical Engineering 2024年第5期12卷 1-9页

作者： Tawe Laynde Zakari Yaou karga tapsia lionel Konai Noel Danwe Raidandi Department of Wood Construction University Institute for Wood Technology University of Yaounde 1 Yaounde Cameroon Department of Industrial and Mechanical Engineering National Advance School of Engineering University of Yaounde 1 Yaounde Cameroon Department of Mechanical Petroleum and Gas Engineering National Advance School of Mines and Petroleum Industries University of Maroua Maroua Cameroon

Salvaged cow horns from slaughterhouses have been transformed into fine particles for a physical characterization that has led us to determine the humidity rate (2.34% ± 0.054%), the actual density situated between 0.586 g/cm3 and 0.732 g/cm3, the swelling rate (12%), and one chemical characterization that permitted us to determine the rate of dry matters (97.05%), of mineral matters (2.5%), of protein matters (94.52%). From these weak values, it can easily be seen that cow horn case doesn’t absorb much water and improve the mechanical characteristics of the composite;the high rate of protein shows that keratin which is the structural molecule favors its gripping as reinforcing element in the manufacturing of composite materials.

关键词： Horns Fibers Polymer Loads Physical Properties Chemical Composition

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Desorption Behavior and Thermogravimetric Analysis of Bio-Hardeners

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Journal of Renewable Materials 2022年第8期10卷 2015-2027页

作者： Benoit Ndiwe Antonio Pizzi Hubert Chapuis Noel Konai lionel karga Pierre Girods Raidandi Danwe Department of Mechanical Engineering Higher Technical Teacher Training College Douala(ENSET)University of DoualaDoualaCameroon Laboratory of Forest Resources and Wood Valorization(Larefob) ENSET of DoualaDoualaCameroon Department of Engineering Science West UniversityTrollhättanSweden LERMAB-ENSTIB University of LorraineEpinal88051France Laboratoire D’Etudes et de Recherche sur le Matériau Bois LERMAB Facultédes Sciences et TechnologiesUniversitéde LorraineNancyFrance Laboratory of Materials Mechanics Structures and Integrated ManufacturingNational Advanced School of EngineeringYaoundé1 UniversityYaoundéCameroon Department of Mechanical Petroleum and Gas Engineering Faculty of Mines and Petroleum IndustriesUniversity of MarouaKaéléCameroon Laboratory of Mechanic Materials and BuildingSahel Institute of Maroua UniversityMarouaCameroon

In this work,the thermal degradation and drying of bio-hardeners are *** bio-hardeners based on exudates of Senegalia senegal,Vachellia nilotica,Vachellia seyal,and Acacia siebteriana were analyzed by FTIR and thermogravimetric analysis,and a desorption study was also *** analysis by infrared spectroscopy indicates the existence of oligomers of different types all giving 5-hydroxy-2-hydroxymethylfuran and 2,5-dihydroxymethylfuran which are then the real hardening *** pyrolysis of these extracts reveals three main regions of mass loss,a first region is located between 25℃and 110℃reflecting the loss of water from the adhesive and the formation of some traces of volatile organic compounds such as CO_(2)and CO,a second zone characterized by the release of CO,CO_(2)and CH4 gases with peaks between 110°and 798.8℃.At the end of the analysis,about 22%of the initial mass remains undecomposed,this mass corresponds to the rigid segments of the bio-hardener which are not completely decomposed.

关键词： Exudates pyrolysis FTIR bio-hardener desorption

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Physico-Mechanical Properties of Bio-Based Bricks

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Journal of Materials Science and Chemical Engineering 2022年第4期10卷 16-29页

作者： Valentin Makomra lionel karga tapsia Benoit Ndiwe Maxime Dawoua Kaoutoing Noel Konai Abel Njom Tawe Laynde Danwe Raidandi National Advanced School of Publics Works University of Yaounde1 BP 510 Yaoundé Cameroon Department of Mechanical Petroleum and Gas Engineering National Advanced School of Mines and Petroleum Industries of the University of Maroua PO BOX 08 Kaélé Cameroon Higher Technical Teacher Training College of the University of Douala BP 1872 Douala Cameroon Laboratory of Civil Engineering and Mechanical National Advanced School of Engineering University of Yaoundé 1 BP 8390 Yaoundé Cameroon Laboratory of Materials Architecture and Civil Engineering National Advanced School of Engineering University of Maroua BP 46 Maroua Cameroon

The aim of this work is to improve the high performance of mud bricks. The latter was reinforced with rice straws as stabiliser leading to an improvement of the physico-mechanical properties. Thus, the physical characteristics of the clay such as natural water content, density, atterberg limit, plasticity limit (Wp) and plasticity index (Ip) were determined. Their values are respectively 8.39%, 2025.73 Kg/m3, 47.66%, 29.75% and 17.91%. The clay used is a low plastic organic silt. The normal proctocol provided an optimum dry density (ɣOP) of 1.28 Kg/m3 at an optimum moisture content of 12.42%. The actual density of the straw is 464 Kg/m3, its absorption rate reached 206% in 5 mins and stabilised at 385% at 480 mins of immersion. The maximum bending and compression strengths are respectively 1.52 and 0.164 MPa. The mud brick absorption coefficients obtained are between 4.875 at 0% straw and 20.573% at 3% straw.

关键词： Mud Bricks Physico-Mechanical Characteristics Clay Rice Straw

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Characteristics and Mechanicals Potentials of Wood Adhesives Manufactured with Grasses’ Lignins

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Journal of Materials Science and Chemical Engineering 2019年第1期7卷 35-47页

作者： lionel tapsia karga Danwe Raidandi Noel Konai Antonio Pizzi Lucien Meva’a Laboratory of Mechanics and Civil Engineering National Advanced School of Engineering University of Yaoundé 1 Yaoundé Cameroon Department of Mechanical Engineering Petroleum and Gas Faculty of Mines and Petroleum Industries University of Maroua Kaélé Cameroon Departement of Mechanical Engineering and Materials National Advanced School of Engineering University of Maroua Maroua Cameroon ENSTIB-LERMAB University of Lorraine Epinal France

In order to manufacture environmentally friendly particle boards and enhance local resources, the lignins of Sorghum bicolor and Andropogon gayanus characterized using RMN 13C and MALDI TOF have the same structures. They contents Guaiacyl (G), Syringyl (S), p-hydroxyphenylpropane (H) and functional groups of phenols, flavonoids and secondary alcohols. The total phenol content determinated using Folin-Ciocalteu reagent is respectively 20.97 and 15.42 mg eqgallic acid/g of extract. The power of their adhesives is different. The Internal Bond (IB) of particleboards manufactured with these adhesives are respectively 0.37 MPa and 0.41 MPa. These lignins can be used as antioxydants.

关键词： Lignins Sorghum bicolor and Andropogon gayanus Structures Adhesives Internal Bond Antioxydants

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