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Bio-PCM Panels Composed of Renewable materials Interact with Solar Heating Systems for Building Thermal Insulation

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Journal of Renewable materials 2024年第4期12卷 771-798页

作者： Yosr Laatiri Habib Sammouda Fadhel Aloulou laboratory of energy and materials:labem-lr11es34 University of SousseHammam SousseTunisia

This article aims to present the feasibility of storing thermal energy in buildings for solar water heating while maintaining the comfort environment for residential *** contribution is the creation of insulating composite panels made of bio-based phase change materials(bio-PCM is all from coconut oil),cement and renewable materials(treated wood fiber and organic clay).The inclusion of wood fibers improved the thermal properties;a simple 2%increase of wood fiber decreased the heat conductivity by approximately 23.42%.The issues of bio-PCM leakage in the cement mortar and a roughly 56.5%reduction in thermal conductivity with bio-PCM stability in composite panels can be resolved by treating wood fibers with an adjuvant by impregnating them in bio-PCM in the presence of the treated clay *** and wood fiber were treated with adjuvants that are both biological and environmentally acceptable,as confirmed by FTIR *** heat transfer bench(DIDATEK)showed a decrease in thermal *** using differential scanning calorimetric(DSC)analysis,the investigation of thermal stability and enthalpy during two heating cycles of pure bio-PCM and composite bio-PCM was *** novel renewable material was used to create composite panels for the trial prototype,which took the shape of a component attached to the solar heating system,33.57%less heat was lost,according to the heat transfer *** outcomes demonstrated the possibility of replacing traditional electric water heating in residential buildings with solar water heating systems.

关键词： Cement wood fiber PCM thermal conductivity thermal insulation solar energy

Influence and Dispersion of Nanofiber of Wood Modified on Properties of Cement Based Mortars

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Journal of Renewable materials 2019年第7期7卷 631-641页

作者： Fadhel Aloulou Alila Sabrine Habib Sammouda labem-lr11es34:laboratory of energy and materials University of SousseTunisia LMSE:Laboratoire Sciences des Matériaux et Environnement University of SfaxTunisia

Wood nanofibers from industrial waste have been used as polymeric material to reinforce the cement paste to a content of up to 2%by weight of *** effect of the wood nanofibre content on the porosity,the compressive strength and the degree of hydration of the cement was *** results showed an improvement in compressive strength of over 50%with 1%of added *** modification of nanofiber wood by grafting alkyl chains to their surface can reduce the amount of water absorbed by the *** of an anionic additive(SDBS)to the mixing water improves the surface of the samples more and more by minimizing the pore size by emulsion effect,hence the water absorption *** degree of hydration of the cement increased with the cellulose content containing *** analysis revealed that the presence of nanofibers favored the hydration of the cement by producing more calcium silicate gel and portlandite,probably the main reason for this improvement in compressive strength.

关键词： Cement nano-fiber wood modified adjuvant,surfactant emulsion

Characterization and Influence of Nanofiber Flours of Wood Modified on Fresh State Properties of Cement Based Mortars

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Journal of Renewable materials 2019年第6期7卷 557-566页

作者： Fadhel Aloulou Sabrine Alila labem-lr11es34:laboratory of energy and materials University of SousseTunisia Laboratoire Sciences des Matériaux et Environneme nt University of SfaxTunisia

Nanofibrillated wood fiber was used as fillers in the partial cement matrix replacing the cement to a content of up to 2%by weight of *** nanofibrillated effect of wood fibers on porosity,thermal properties and compressive strength was *** results obtained showed an improvement in compressive strength of more than 40%with 1%by weight of wood fiber *** addition of nanofibrillated wood fiber shows a good pore reduction,and the best result was obtained with emulsion of a mixture incorporating 1%by weight of wood fiber nanofibrillate in the presence of an anionic surfactant(SDBS).Thermal conductivity measurements and thermal expansion coefficient,compared to nanofibrillated wood fiber reinforced cement pastes,showed the reinforcing efficiency of cellulose fiber *** degree of hydration of the cement increased with nanofibrillated wood *** property has been confirmed by Fourier transform infrared *** analyzes revealed that the presence of nanofibrillated wood fibers generates and promotes the hydration of the cement,producing more portlandite and calcium silicate gel,which influences the compressive strength which gives a strong improvement.

关键词： Cement nano-fiber flour nano-fiber wood modified adjuvant surfactant emulsion

Stabilization and Evaluation of Modified Nanofiber Flour Wood on the Properties of Cement-Baszd Mortar

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Journal of Renewable materials 2019年第8期7卷 763-774页

作者： Fadhel Aloulou Sabrine Alila Habib Sammouda laboratory of energy and materials(labem):lr11es34 Higher School of Science and Technology of Hammam SousseUniversity of SousseSousseTunisia Laboratoire Sciences des Matériaux et Environnement:LMSE Facultédes Sciences de SfaxUniversity of SfaxSfaxTunisia

The influence of nanofiberwood on the properties of the fresh condition of cement based mortars is not known in detail,despite recent advances in nanocellulose technology and it is related composite *** wood from industrial waste,produced by high-pressure homogenization,was used as cement partial replacement for cement paste at a content ranging from 0%to 2%by weight of *** effect of the nanofiber wood content on the porosity,the compressive strength and the degree of hydration of the cement was *** have shown an improvement in the compressive strength by more than 50%with 1%of added fiber *** chemical modification of nanofibers wood by grafting of chains alkyls in their surfaces can reduce the quantity of water absorbed by the *** addition of an anionic additive(SDBS)in the water of mixing improves of more the surface of samples by minimizing the size of pores by emulsion effect,from where the absorption of water *** degree of hydration of the cement has increased with the cellulose content containing *** analyze revealed that the presence of nanofiber wood favored the hydration of the cement by producing more calcium silicate gel and portlandite,probably the main reason for this improvement in compressive strength.

关键词： Cement nano-fiber adjuvant surfactant emulsion hydratation thermal conductivity

Crystal Structure, Thermal Behavior and Vibrational Spectra of 4,4’Diamoniumdiphenylmethan Sulfate Hydrate

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Open Journal of Inorganic Chemistry 2017年第2期7卷 61-73页

作者： Takoua Ben Issa Latifa Benhamada laboratory of energy and materials (labem-lr11es34) High School of Sciences and Technologies of Hammam Sousse Hammam Sousse Tunisia Facultyof sciences of Monastir Hammam Sousse Tunisia

Single crystals of the 4,4’-diamoniumdiphenylmethan sulfate hydrate, denoted DDPS, were grown by slow evaporation solution technique at room temperature. The compound was characterized by single crystal X-ray diffraction, IR and thermal analysis (TG-DTA). It crystallizes in the monoclinic system (space group C2/c) with the following unit cell dimensions: a = 17.7635(10) ?, b = 9.3796(10) ?, c = 27.5676(10) ?, β = 97.37(2)°, V = 4555.2(6) ?. The structure was solved by the direct method and refined to final R value of 0.0472 for 2108 independent reflections. The anions are hydrogen bonded to each other, forming clusters [HS2O8]3﹣ parallel to the plan (a, b). The water molecules connect these clusters via O-H···O hydrogen bonds. The organic cations are attached to the clusters through N-H···O hydrogen bonds, forming an infinite three-dimensional network.

关键词： Organic Sulfate Crystalline Structure Vibrational Spectra Thermal Behavior Differential Thermal Analysis

Optimal Experiment Design for the Identification of the Interfacial Heat Transfer Coefficient in Sand Casting

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Fluid Dynamics & materials Processing 2022年第6期18卷 1841-1852页

作者： Dorsaf Khalifa Foued Mzali University of Monastir National Engineering School of MonastirLaboratory of Thermal and Energy Systems Studies(LESTE)MonastirLR99ES31Tunisia

The interfacial heat transfer coefficient(IHTC)is one of the main input parameters required by casting simulation *** plays an important role in the accurate modeling of the solidification ***,its value is not easily identifiable by means of experimental methods requiring temperature measurements during the solidification process *** these reasons,an optimal experiment design was performed in this study to determine the optimal position for the temperature measurement and the optimal thickness of the rectangular cast iron *** parameter was identified using an inverse *** particular,two different algorithms were used:Levenberg Marquard(LM)and Monte Carlo(MC).A numerical model of the solidification process was associated with the optimization *** temperature was measured at different positions from the mould/metal interface at d=0 mm(mould/metal interface),30 mm,60 mm and 90 *** thicknesses of the cast part were:L1=40 mm,60 mm and 80 mm.A comparative study on the IHTC identification was then carried out by varying the initial value of the IHTC between 500 Wm^(-2)K^(-1) and 1050 Wm^(-2)K^(-1).Results showed that the MC algorithm used for estimating the IHTC gives the best results,and the optimal position was at d=30 mm,the position closest to the mould/metal interface,for the lowest thickness L1=40 mm.

关键词： Monte Carlo interfacial heat transfer coefficient Levenberg Marquard optimal experiment design sand casting

Bioactive film based on chitosan incorporated with cellulose and aluminum chloride for food packaging application:Fabrication and characterization

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Food Bioscience 2023年第3期53卷 1612-1619页

作者： Eya Beji Sherif M.A.S.Keshk Sabrine Douiri Khaled Charradi Rached Ben Hassen Maher Gtari Hamadi Attia Dorra Ghorbel University of Carthage INSATCentre Urbain NordB.P.6761080TunisTunisia University of Sfax ENISFood AnalysisValorizationand Safety LaboratoryLAVASALR11ES45BPW 3038SfaxTunisia University of Tunis El Manar ISSBATLaboratory of BioresourcesEnvironment and BiotechnologyLR22ES049 Street Zouheir EssafiCP 1006TunisTunisia Technopark Borj Cedria Research and Technology Center of EnergyCRTEnNanomaterials and Systems for Renewable Energy LaboratoryBP 095Hammam-LifTunisia University of Tunis El Manar ISSBATLaboratory of Materials and Environment for Sustainable DevelopmentLR18ES109 Street Zouheir EssafiCP 1006TunisTunisia

Bioactive packaging materials are developed responding to the considerable environmental and human health risks caused by plastic *** this study,a new generation of ternary composite films based on aluminum chloride(AlCl_(3))/chitosan(CS)/cellulose(Cel)was fabricated for use as bioactive ***,XRD,SEM and TGA results confirmed AlCl_(3)/CS incorporation with Cel and homogeneous distribution in the ***-Vis spectrometry of the ternary composite films showed a lack of light transmission in the UVA and UVB regions,indicating the highest protective efficiency of the composite *** AlCl_(3)/CS/Cel composite films manifested higher water uptake in comparison with CS/Cel film,thus AlCl_(3) improved the hydrophilicity and mechanical properties of AlCl_(3)/CS/Cel composite ***,the AlCl_(3)/CS/Cel composite exhibited better antimicrobial activity against Gram-positive and Gram-negative bacteria than the pristine *** results suggested that the bioactive AlCl_(3)/CS/Cel film utilized in this study might be a promising material in food packaging to prolong the shelf life and improve food safety.

关键词： Bioactive packaging film Chitosan Cellulose Aluminum chloride

Cellulose Fibre from Schinus molle and Its Characterization

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Journal of Renewable materials 2022年第10期10卷 2593-2606页

作者： Abir Razzak Faten Mannai Ramzi Khiari Younes Moussaoui Mohamed N.Belgacem laboratory for the Application of materials to the Environment Waterand Energy(LR21ES15)Faculty of Sciences of GafsaUniversity of GafsaGafsa2112Tunisia Faculty of Sciences of Gafsa University of GafsaGafsa2112Tunisia laboratory of Environmental Chemistry and Cleaner Process(lr21es04) University of MonastirMonastir5019Tunisia Higher Institute of Technological Studies(ISET)of Ksar-Hellal Ksar-Hellal5070Tunisia University of Grenoble Alpes CNRSGrenoble INPLGP2GrenobleF-38000France Organic Chemistry laboratory(lr17es08) Faculty of Sciences of SfaxUniversity of SfaxSfax3029Tunisia

The exploitation of biomass represents a major environmental challenge related to the protection of the environment and the progressive exhaust of fossil *** this perspective,the main objective of this work is the extraction and the characterization of natural lignocellulosic fibers from the Schinus *** cellulose fibre extraction was investigated employing conditions of alkali *** the alkaline steps,a bleaching treatment was done and let to a yield about 45%pure *** identification of the chemical composition of Schinus molle reveals that this raw material contains a high level of biopolymers with a cellulose rate of 53.2%.Extracted cellulose fibers have been characterized by several techniques such as scanning electron microscopy,Fourier transform infrared,X-ray diffraction,Morfi,and by the determination of their degree of ***-IR results confirm the purity of the cellulosic fibers,and XRD analysis reveals that the crystallinity increases after the delignification and bleaching treatments.

关键词： Schinus molle cellulose alkaline treatment morphological studies

Turbulent boundary layers and hydrodynamic flow analysis of nanofluids over a plate

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Journal of Central South University 2021年第11期28卷 3340-3353页

作者： AOUINET Hana DHAHRI Maher SAFAEI Mohammad Reza SAMMOUDA Habib ANQI Ali E. Higher Private School of Engineering and Applied Technology(IHE-esPITA) SousseTunisia laboratory of energy and materials(labem)(lr11es34) High School of Sciences and Technology of Hammam SousseSousse UniversityBP 4011Hammam SousseTunisia Department of Medical Research China Medical University HospitalChina Medical UniversityTaiwanChina Mechanical Engineering Department Faculty of EngineeringKing Abdulaziz UniversityJeddahSaudi Arabia Department of Mechanical Engineering College of EngineeringKing Khalid UniversityAbha 61421Saudi Arabia Research Center for Advanced materials Science(RCAMS) King Khalid UniversityAbhaSaudi Arabia

A numerical analysis of the log-law behavior for the turbulent boundary layer of a wall-bounded flow is performed over a flat plate immersed in three nanofluids(Zn O-water,SiO_(2)-water,TiO_(2)-water).Numerical simulations using CFD code are employed to investigate the boundary layer and the hydrodynamic *** validate the current numerical model,measurement points from published works were used,and the compared results were in good *** were carried out for the velocity series of 0.04,0.4 and 4 m/s and nanoparticle concentrations0.1% and 5%.The influence of nanoparticles’ concentration on velocity,temperature profiles,wall shear stress,and turbulent intensity was *** obtained results showed that the viscous sub-layer,the buffer layer,and the loglaw layer along the potential-flow layer could be analyzed based on their curving quality in the regions which have just a single wall *** was seen that the viscous sub-layer is the biggest area in comparison with other ***,the section where the temperature changes considerably correspond to the thermal boundary layer’s thickness goes a downward trend when the velocity *** thermal boundary layer gets deep away from the leading ***,a rise in the volume fraction of nanoparticles indicated a minor impact on the shear stress developed in the *** all cases,the thickness of the boundary layer undergoes a downward trend as the velocity increases,whereas increasing the nanoparticle concentrations would enhance the *** precisely,the log layer is closed with log law,and it is minimal between Y^(+)=50 and Y^(+)=*** temperature for nanoparticle concentration φ=5%is higher than that for φ=0.1%,in boundary layers,for all studied ***,it is established that the behavior is inverted from the value of Y^(+)=1 and the temperature for φ =0.1% is more important than the case of φ =5%.For turbulence intensity peak,this peak exists at Y^(+)

关键词： turbulent boundary layers nanofluids hydrodynamic flow wall shear stress turbulent intensity