Effect of Al₂O₃ Nanofiller on the Mechanical Performance of Hemp-kenaf Reinforced Epoxy Hybrid Composites
J. Environ. Nanotechnol., Volume 14, No 3 (September 2025) pp. 612-622
Abstract
Biocompatibility, affordability, and broad availability are three reasons why natural-based composites are gaining popularity among both producers and consumers. The possibility of forming a composite with Alumina (Al2O3) a cost-effective nano filler material, natural fibers, and an epoxy matrix is explored in this study. In particular, it investigates the effects of three different Al2O3 concentrations on the mechanical properties of a hybrid composite made of hemp and kenaf, including hardness, impact resistance, flexural strength, and inter-laminar shear strength (ILSS). Hand layup followed by hot pressing was used to produce the composites. The composite containing 6 wt% Al2O3 (C3) outperformed the other configurations by a margin of 2% to 36 % in terms of tensile, flexural, ILSS, and impact strengths. Adding 6 wt% Al2O3 increased the mechanical properties of the composite by increasing fiber-matrix adhesion, according to scanning electron microscopy (SEM) study of the cracked surfaces.
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Reference
Alshahrani, H. and Prakash, V. R. A., Characterisation of microcrystalline cellulose from waste green pea pod sheath and its sunn hemp fibre-polyester composite: A step towards greener manufacturing, Physiol. Plant., 176(1), e14166(2024).
https://doi.org/10.1111/ppl.14166
Alshahrani, H. and Prakash, V. R. A., Characterisation of Nanocellulose from Waste Pisum Sativum Sheath and its Sunn Hemp Fibre-Polyester Composite: A Step Towards Valorisation of Biomass, Waste Biomass Valorization., 16(4), 1999–2010(2025).
https://doi.org/10.1007/s12649-024-02794-9
Amjad, A., Abidin, M. S. Z., Alshahrani, H. and Rahman, A. A. A., Effect of fibre surface treatment and nanofiller addition on the mechanical properties of flax/pla fibre reinforced epoxy hybrid nanocomposite, Polym., 13(21), 3842(2021).
https://doi.org/10.3390/polym13213842
Amjad, A., Rahman, A. A. A. and Abidin, M. S. Z., Effect of Nanofillers on Mechanical and Water Absorption Properties of Alkaline Treated Jute Fiber Reinforced Epoxy Bio Nanocomposites, J. Nat. Fibers., 19(16), 14592–14608(2022).
https://doi.org/10.1080/15440478.2022.2068171
Arunachalam, S. J., Saravanan, R., Othman, N. A., Thanikodi, S., Giri, J., Azizi, M. and Saidani, T., Artificial Intelligence-Driven Prediction and Optimization of Tensile and Impact Strength in Natural Fiber/Aluminum Oxide Polymer Nanocomposites, Eng. Rep., 7(4), (2025).
https://doi.org/10.1002/eng2.70093
Bharathi, M., Kumaran, S. S. and Samson, P. E., Effect of silica nanoparticles on mechanical and thermal properties of intra-inter ply hybrid laminated composites, Mater. Res. Express., 8(4), 045306(2021).
https://doi.org/10.1088/2053-1591/abf530
Dash, C., Das, A. and Bisoyi, D. K., High-Intensity Ultrasonication (HIU) Effect on Sunn Hemp Fiber-Reinforced Epoxy Composite: A Physicochemical Treatment Toward Fiber, 1st Ed., Natural Polymers, Apple Academic Press, 193–224(2022).
https://doi.org/10.1201/9781003130765-8
Edlabadkar, A. P., Madhu, M. C., Arunbharathi, R., Sharma, D., Singh, N., Revathi, R. and Mayakannan, S., Optimization of Mechanical Properties of Cordia dichotoma/Alumina Nanoparticle Reinforced Epoxy Nanocomposites Under Alkali Treatment Using ANN Techniques, J. Environ. Nanotechnol., 14(2), 525–540(2025).
https://doi.org/10.13074/jent.2025.06.2521549
Haile, D., Mengesha, G. A., Sinha, D. K., Kebere Aschenaki, H. and Beshahwured, S. L., Effect of bamboo powder on mechanical property of aluminum matrix composite reinforced with aluminum oxide, boron carbide and molybdenum disulfide, Adv. Mech. Eng., 16(1), 16878132231221646(2024).
https://doi.org/10.1177/16878132231221646
Harak, S. S., Krishnaveni, K., Karthick, K., Chinnarasu, K., Prasad, P. V. H., Tonk, A. and Mayakannan, S., Experimental Study on the Mechanical Properties of Hybrid Areca and Abaca Fiber Reinforced Polymer Composites, J. Environ. Nanotechnol., 13(4), 92–101(2024).
https://doi.org/10.13074/jent.2024.12.244977
Herlina, S. N., Suteja, S., Pruncu, C. I., Setyawan, I., Ilyas, R. A. and Lamberti, L., Physicomechanical, water absorption and thermal properties and morphology of Paederia foetida fiber–Al2O3 powder hybrid-reinforced epoxy composites, Polym. Int., 73(7), 573–585(2024).
https://doi.org/10.1002/pi.6632
Jadhav, A. C. and Jadhav, N. C., Waste sunn hemp fibres/epoxy composites: mechanical and thermal properties, Iran. Polym. J., 31(7), 821–833(2022).
https://doi.org/10.1007/s13726-022-01034-y
Jayabalakrishnan, D., Kumar, S. S., Madhu, S. and Bhaskar, K., Flame retardant, load bearing and thermal studies on satin weaved sunn hemp fibre and cashew nut shell de-oiled cake biosilica epoxy composites, Biomass Convers. Biorefin., 14(17), 21085–21093(2024).
https://doi.org/10.1007/s13399-023-04055-6
John, P. K. A., Ravikumar Solomon, G., Sivakumar, S., Sathish, S. and Viswanathan, K., Effect of rosin and flax fibers on the improvement in mechanical properties of hybrid polymeric composites. International Journal of Mechanical and Production Eng. Res. Develop., 10(2), 867–878(2020).
Krishna, V. N., Elango, M., Krishnan, T. and Jayabal, S., Tensile, Flexural and Impact Properties of Hybrid Sunnhemp-Flax Fiber Based Thermosetting Composites, J. Nat. Fibers., 19(15), 10737–10745(2022).
https://doi.org/10.1080/15440478.2021.2002765
Krishna, V. N., Sivasankaran, R., Prasad, S. D. and Govardhanan, M. S., Hybrid Polyester Composites Reinforced with Sunn Hemp and Flax Fibres: Shore D Hardness and Dimensional Stability Analysis, Trans. Famena., 49(1), 15–24(2025).
https://doi.org/10.21278/TOF.491055423
Lakshmaiya, N., Ganesan, V., Paramasivam, P. and Dhanasekaran, S., Influence of Biosynthesized Nanoparticles Addition and Fibre Content on the Mechanical and Moisture Absorption Behaviour of Natural Fibre Composite, Appl. Sci., 12(24), 13030(2022).
https://doi.org/10.3390/app122413030
Mahendran, G., Mageswari, M., Kakaravada, I. and Rao, P. K. V., Characterization of polyester composite developed using silane-treated rubber seed cellulose toughened acrylonitrile butadiene styrene honey comb core and sunn hemp fiber, Polym. Bull., 81(17), 15955–15973(2024).
https://doi.org/10.1007/s00289-024-05427-2
Manalu, J., Numberi, J. J., Safanpo, A., Fitriyana, D. F., Wijaya, T. L., Siregar, J. P., Cionita, T. and Jaafar, J., Characterization of eco-friendly composites for automotive applications prepared by the compression molding method, Polym. Compos., 45(9), 8104–8118 (2024).
https://doi.org/10.1002/pc.28327
Mayakannan, S., Raj, J. B., Raja, V. L. and Nagaraj, M., Effectiveness of silicon nanoparticles on the mechanical, wear, and physical characteristics of PALF/sisal fiber–based polymer hybrid nanocomposites, Biomass Convers. Biorefin., 13(14), 13291–13305(2023).
https://doi.org/10.1007/s13399-023-04654-3
Olatunbosun, B., Manalo, A., Aravinthan, T., Chen, G. and Kiriella, S., Modelling of manufacturing parameters and characterisation on the mechanical properties of sunn hemp (Crotalaria juncea L.) bio-composites with different fibre forms,s Constr. Build. Mater., 489, 142349(2025).
https://doi.org/10.1016/j.conbuildmat.2025.142349
Raj, H., Choudhury, A. M., Tripathi, S., Bauri, S., Mandal, S. S., Prakash, R., Tiwari, S., Layek, R. K. and Maiti, P., Sunn hemp reinforced poly (lactic acid) green composites: Controlled biodegradation and improved fracture toughness through interlocking mechanism, Ind. Crops Prod., 223, 120245(2025).
https://doi.org/10.1016/j.indcrop.2024.120245
Raja, T., Vinayagam, M., Venkataramanan, A. R., Mohankumar, A., Chinnathambi, A., Alharbi, S. A. and Kalam, M. A., Effect of nano alumina particles on Boehmeria nivea fiber-reinforced polyester green composite: biological, elemental and mechanical analysis, Opt. Quantum Electron., 56(4), 538(2024).
https://doi.org/10.1007/s11082-023-06188-4
Rakeshkumar, C., Surenderpaul, A., Naveen, R. and Kumar, A. S., Effect of chemical treatment on mechanical properties of prosopis juliflora fibre and glass fiber with nano fillers, Mater. Today Proc., , S221478532301(2023).
https://doi.org/10.1016/j.matpr.2023.03.398
Kumar, M. S., Sivakumar, M., Senthil, S. M. and Rajeshkumar, L., Effect of alumina fillers on physical and mechanical properties of luffa/groundnut shell natural fiber reinforced polymer composites, Polym. Compos., 45(11), 10457–10469(2024).
https://doi.org/10.1002/pc.28487
Shohrawardy, M. H. S., Mina, M. F., Alam, A. K. M. M., Khan, R. A. and Hossain, M. M., Effects of chemical treatment and gamma-ray irradiation on the structure-properties of sunn hemp and okra hessian cloth reinforced high-density polyethylene composites: A comparative study, J. Thermoplast. Compos. Mater., 37(12), 3735–3764(2024).
https://doi.org/10.1177/08927057241239941
Subbiah, A., Chockalingam, P., Munimathan, A. and Mayakannan, K., Effect of fiber orientation on interlaminar shear stresses and thermproperty of sisal fiber reinforced epoxy composites, Rev. Mater., 29(4), e20240491(2024).
https://doi.org/10.1590/1517-7076-rmat-2024-0491
Taj, A., Swamy, R. P., Naik, K. and Bharath, K. N., An evaluation on mechanical properties of vaccum bagging processed kenaf epoxy nano aluminium oxide and nanographene composites, Eng. Res. Exp., 5(2), 025007(2023).
https://doi.org/10.1088/2631-8695/acc996
Tavadi, A., Basheer, D., Melese, K. G., Kumaresan, K., Mohan, N., Kerur, M. R. H. and Shashidhara, L. C., Experimental analysis of mechanical properties and FTIR analysis of areca fiber-reinforced epoxy composites incorporating Al2O3, J. Ind. Text., 55, 15280837241313217(2025).
https://doi.org/10.1177/15280837241313217
Tharanitharan, G., Saravanan, C., Raja, P. and Ajaykarthik, R. T., Investigation of temperature and water aging effects on epoxy composites reinforced with natural fibers and surface-modified cellulose filler, Polym. Bull., 82(10), 4621–4647(2025).
