ECO-BIOCOMPOSITE MATERIALS FOR SHOCK CUSHIONING APPLICATION: AN OUTLOOK OF THE POTENTIALS AND CHALLENGES

2015 ◽  
Vol 76 (5) ◽  
Author(s):  
David, N. V. ◽  
Siti Syahidah M. Rum
Keyword(s):  
Biodegradable Polymer ◽  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Mechanical And Thermal Properties ◽  
Low Carbon ◽  
Processing Technologies ◽  
Low Carbon Economy ◽  
Fiber Matrix ◽  
By Products

Recently there is an increased concern for the development of not only well-designed but also sustainable materials. Material sustainability is associated with the extraction of renewable resources and disposal procedures that would not injure our ecosystem. In this respect, indigenous agricultural wastes or by-products are suitable alternatives to lightweight and disposable green-materials at low cost. Agro-waste and biomass materials are plentiful in many parts of the world including Malaysia. Fibers obtained from agricultural by-products are often used as fillers or reinforcement in non-biodegradable polymer matrix. Polylactic acid (PLA), which is a compostable and biodegradable thermoplastic, is derived from renewable agro-sources such as potato, corn, or sugarcane. The mechanical and thermal properties of select biofibers-filled PLA composites are comparable to that of the composites made from conventional fibers. Research findings imply the feasibility of processing PLA with natural fibers such as kenaf using existing manufacturing technologies. Natural fiber filled biodegradable polymer composite materials have the advantage of simple and safe disposal over petroleum-based polymers besides generating new low-carbon economy for the plantation sector. However, research outcomes show that the fiber/matrix interface of PLA and natural fiber is weak due to incompatible surface properties of the two material types. In this article, issues pertaining to fiber/matrix interfacial adhesion, potential renewable sources of polymers and processing technologies of natural fiber (or –eco)-biocomposite materials are reviewed. The prospect of replacing traditional polymers obtained from non-renewable fossil resources with biopolymers to develop sustainable eco-biocomposite materials for shock cushioning application such as for packing and packaging materials is discussed in particular.

scholarly journals Performance of lightweight mortar reinforced with doum palm fiber

2020 ◽  
pp. 002199832097519
Author(s):  
Fatma Naiiri ◽  
Allègue Lamis ◽  
Salem Mehdi ◽  
Zitoune Redouane ◽  
Zidi Mondher
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Natural Fiber ◽  
Cement Mortar ◽  
Low Cost ◽  
Natural Fibers ◽  
Construction Materials ◽  
Mechanical And Thermal Properties ◽  
Palm Fiber ◽  
And Control

Natural fibers are increasingly used in composites because of their low cost and good mechanical properties. Cement reinforced with natural fibersis contemplates as a new generation of construction materials with superior mechanical and thermal performance. This study of three sizes’effect of Doum palm fiber explores the mortar’s behavior reinforced with different fiber ratio. The aim is to determine the optimal addition to improve mechanical and thermal properties of natural fiber reinforced cements. Physical, mechanical and thermal properties of composite are examined. Tensile properties of Doum fibers are verified to determine their potential as reinforced material. Findings prove that the use of alkali-treated Doum fiber as reinforcement in cement mortar composite leads to the upgrading of the mechanical properties including thermo-physical properties against composites reinforced with raw fibers and control cement mortars. While, the compression and flexural strength of the cement mortar reinforced with alkali-treated Doum fiber with diameter 0.3 mm (CT3) are metered to be 11.11 MPa, 5.22 MPa, respectively for fiber content 0.5%. Additionally, based on thermo-physical tests, it is assessed that the thermal conductivity and diffusivity decrease for cement mortar reinforced with Doum fiber with diameter 0.2 mm (CT2).

Review of Natural Fiber Reinforced Elastomer Composites

2018 ◽  
Author(s):  
Pantea Kooshki ◽  
Tsz-Ho Kwok
Keyword(s):  
Mechanical Properties ◽  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Fiber Surface ◽  
Specific Strength ◽  
Elastomeric Matrix ◽  
The Matrix ◽  
Fiber Matrix ◽  
Physical Treatments

This paper is a review on mechanical characteristics of natural fibers reinforced elastomers (both thermoplastics and thermosets). Increasing environmental concerns and reduction of petroleum resources attracts researchers attention to new green eco-friendly materials. To solve these environmental related issues, cellulosic fibers are used as reinforcement in composite materials. These days natural fibers are at the center of attention as a replacement for synthetic fibers like glass, carbon, and aramid fibers due to their low cost, satisfactory mechanical properties, high specific strength, renewable resources usage and biodegradability. The hydrophilic property of natural fibers decreases their compatibility with the elastomeric matrix during composite fabrication leading to the poor fiber-matrix adhesion. This causes low mechanical properties which is one of the disadvantages of green composites. Many researches have been done modifying fiber surface to enhance interfacial adhesion between filler particles and elastomeric matrix, as well as their dispersion in the matrix, which can significantly affect mechanical properties of the composites. Different chemical and physical treatments are applied to improve fiber/matrix interlocking.

Buckling analysis of natural fiber reinforced composites

2021 ◽  
Vol 7 (2) ◽  
pp. 58
Author(s):  
Celal Çakıroğlu ◽  
Gebrail Bekdaş
Keyword(s):  
Composite Plate ◽  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Experimental Studies ◽  
Fiber Reinforced Composites ◽  
Fiber Types ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Element Analysis

In the recent years natural fiber reinforced composites are increasingly receiving attention from the researchers and engineers due to their mechanical properties comparable to the conventional synthetic fibers and due to their ease of preparation, low cost and density, eco-friendliness and bio-degradability. Natural fibers such as kenaf or flux are being considered as a viable replacement for glass, aramid or carbon. Extensive experimental studies have been carried out to determine the mechanical behavior of different natural fiber types such as the elastic modulus, tensile strength, flexural strength and the Poisson’s ratio. This paper presents a review of the various experimental studies in the field of fiber reinforced composites while summarizing the research outcome about the elastic properties of the major types of natural fiber reinforced composites. Furthermore, the performance of a kenaf reinforced composite plate is demonstrated using finite element analysis and results are compared to a glass fiber reinforced laminated composite plate.

scholarly journals A Multidisciplinary Perspective of Ultra-Processed Foods and Associated Food Processing Technologies: A View of the Sustainable Road Ahead

Nutrients ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 3948
Author(s):  
Francesco Capozzi ◽  
Faidon Magkos ◽  
Fabio Fava ◽  
Gregorio Paolo Milani ◽  
Carlo Agostoni ◽  
...  
Keyword(s):  
Health Outcomes ◽  
Food Processing ◽  
Low Cost ◽  
Classification Systems ◽  
Processed Foods ◽  
Processing Technologies ◽  
Adverse Health Outcomes ◽  
Increased Risk ◽  
Multidisciplinary Perspective ◽  
By Products

Ultra-processed foods (UPFs) are negatively perceived by part of the scientific community, the public, and policymakers alike, to the extent they are sometimes referred to as not “real food”. Many observational surveys have linked consumption of UPFs to adverse health outcomes. This narrative synthesis and scientific reappraisal of available evidence aims to: (i) critically evaluate UPF-related scientific literature on diet and disease and identify possible research gaps or biases in the interpretation of data; (ii) emphasize the innovative potential of various processing technologies that can lead to modifications of the food matrix with beneficial health effects; (iii) highlight the possible links between processing, sustainability and circular economy through the valorisation of by-products; and (iv) delineate the conceptual parameters of new paradigms in food evaluation and classification systems. Although greater consumption of UPFs has been associated with obesity, unfavorable cardiometabolic risk factor profiles, and increased risk for non-communicable diseases, whether specific food processing techniques leading to ultra-processed formulations are responsible for the observed links between UPFs and various health outcomes remains elusive and far from being understood. Evolving technologies can be used in the context of sustainable valorisation of food processing by-products to create novel, low-cost UPFs with improved nutritional value and health potential. New paradigms of food evaluation and assessment should be funded and developed on several novel pillars—enginomics, signalling, and precision nutrition—taking advantage of available digital technologies and artificial intelligence. Research is needed to generate required scientific knowledge to either expand the current or create new food evaluation and classification systems, incorporating processing aspects that may have a significant impact on health and wellness, together with factors related to the personalization of foods and diets, while not neglecting recycling and sustainability aspects. The complexity and the predicted immense size of these tasks calls for open innovation mentality and a new mindset promoting multidisciplinary collaborations and partnerships between academia and industry.

A Review of Recent Developments in Natural Fiber Composites and their Mechanical, Thermal & Machinabilty Properties

2018 ◽  
Vol 1148 ◽  
pp. 61-71 ◽  
Author(s):  
V. Joshua Jaya Prasad ◽  
Puli Suresh Kumar
Keyword(s):  
Exponential Growth ◽  
Power Plants ◽  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Fiber Composites ◽  
Light Weight ◽  
Natural Fiber Composites ◽  
Research And Innovation ◽  
Recent Developments

Recently, there has been an exponential growth in research and innovation in the natural fiber composites (NFC) due to their diversified applications in the field of engineering. Biodegradability, light weight, formability and availability at low cost are the attractive merits of the natural fibers. Mechanical, Thermal and Machinabilty properties of Natural fiber composites have their own advantage and adoptability in the field of automobile, power plants, aeronautical, defense and naval applications. This review aims to provide an overview of the comparison of differ types of Natural fiber composites, factors that affect the mechanical, thermal and machinabilty of NFCs and their engineering applications.

Machining parametric study on the natural fiber reinforced composites: A review

2021 ◽  
pp. 095440622110637
Author(s):  
Vijay Kumar Mahakur ◽  
Sumit Bhowmik ◽  
Promod Kumar Patowari
Keyword(s):  
Natural Fiber ◽  
Low Cost ◽  
Natural Fibers ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Fiber Reinforced ◽  
Machining Processes ◽  
Industrial Sectors ◽  
The Matrix ◽  
Input Variables

Nowadays, the utilization of natural fiber reinforced composite has increased frequently. These natural fibers have significant features like low cost, renewable, and, more importantly, biodegradable in nature, making them to be utilized for various industrial sectors. However, the massive demand for natural fiber reinforced composites (NFRC), forces them to be machined and operated, which is required for countless areas in multiple industries like automotive, marine, aerospace and constructions. But before obtaining the final shape of any specimen, this specimen should come across numerous machining processes to get the desired shape and structure. Therefore, the present review paper focused on the various aspects during conventional and unconventional machining of the NFRC. It covers the work by exploring the influence of all input variables on the outcome produced after machining the NFRC. Various methodologies and tools are also discussed in this article for reducing the machining defects. The machining of the NFRC is found as a challenging task due to insufficient interlocking between the matrix and fibers, and minimum knowledge in machining characteristics and appropriate input parameters. Thus, this review is trying to assist the readers to grasp a basic understanding and information during the machining of the NFRC in every aspect.

scholarly journals Critical Review of the Parameters Affecting the Effectiveness of Moisture Absorption Treatments Used for Natural Composites

2019 ◽  
Vol 3 (1) ◽  
pp. 27 ◽  
Author(s):  
Ahmad Al-Maharma ◽  
Naser Al-Huniti
Keyword(s):  
Moisture Absorption ◽  
Natural Fiber ◽  
Natural Fibers ◽  
Complete Discussion ◽  
Natural Composites ◽  
Review Study ◽  
Fiber Matrix ◽  
Physical Treatments ◽  
The Cost ◽  
High Degree

Natural composites can be fabricated through reinforcing either synthetic or bio-based polymers with hydrophilic natural fibers. Ultimate moisture absorption resistance at the fiber–matrix interface can be achieved when hydrophilic natural fibers are used to reinforce biopolymers due to the high degree of compatibility between them. However, the cost of biopolymers is several times higher than that of their synthetic counterparts, which hinders their dissemination in various industries. In order to produce economically feasible natural composites, synthetic resins are frequently reinforced with hydrophilic fibers, which increases the incompatibility issues such as the creation of voids and delamination at fiber–matrix interfaces. Therefore, applying chemical and/or physical treatments to eliminate the aforementioned drawbacks is of primary importance. However, it is demonstrated through this review study that these treatments do not guarantee a sufficient improvement of the moisture absorption properties of natural composites, and the moisture treatments should be applied under the consideration of the following parameters: (i) type of hosting matrix; (ii) type of natural fiber; (iii) loading of natural fiber; (iv) the hybridization of natural fibers with mineral/synthetic counterparts; (v) implantation of nanofillers. Complete discussion about each of these parameters is developed through this study.

scholarly journals Structural Evaluation on Sugarcane Bagasse Treated Using Sodium and Calcium Hydroxide

2019 ◽  
Vol 130 ◽  
pp. 01018
Author(s):  
Juliana Anggono ◽  
Hariyati Purwaningsih ◽  
Suwandi Sugondo ◽  
Steven Henrico ◽  
Sanjaya Sewucipto ◽  
...  
Keyword(s):  
Weight Loss ◽  
Calcium Hydroxide ◽  
Structural Changes ◽  
Natural Fiber ◽  
Treatment Time ◽  
Alkali Treatment ◽  
Natural Fibers ◽  
Additional Treatment ◽  
Structural Evaluation ◽  
By Products

Greater interest in recent years to the increase demand in using natural fiber reinforcement of polymers is to comply with the increasing stringent international protocols related to climate change and environmental awareness. Many studies have reported the development of renewable and biodegradable agricultural by-products as reinforcement fibers for biocomposites. One of the essential factors in producing strong biocomposites is the properties prepared from the natural fibers which results from the alkalitreatment given. This research aims to evaluate the effect of different treatment duration on structural changes on sugarcane after alkali treatment using sodium hydroxide (NaOH) and calcium hydroxide (Ca(OH)2) solutions. Calcium hydroxide was used as comparative solution in search for milder and more environmental friendly alkali solution as an alternative solution of NaOH. Fourier Transform Infrared (FTIR) confirmed the major removal of lignin and minor of hemicellulose. It shows that the structure did not change considerably with the additional treatment time. The weight loss measurement after each treatmentshows a higher weight loss with the treatment with NaOH (40.5 % to 57.75 %) than the weight loss after Ca(OH)2 treatment (25 % to 46 %). Scanning electron microscope (SEM) observed the morphology changes onthe fiber from both treatments.

scholarly journals Mechanical Properties of Natural-Fiber-Reinforced Biobased Epoxy Resins Manufactured by Resin Infusion Process

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2841 ◽  
Author(s):  
Mauricio Torres-Arellano ◽  
Victoria Renteria-Rodríguez ◽  
Edgar Franco-Urquiza
Keyword(s):  
Epoxy Resins ◽  
Mechanical Characterization ◽  
Natural Fiber ◽  
High Strain ◽  
Low Cost ◽  
Natural Fibers ◽  
Fiber Reinforced ◽  
Resin Infusion ◽  
New Applications

This work deals with the manufacture and mechanical characterization of natural-fiber-reinforced biobased epoxy resins. Biolaminates are attractive to various industries because they are low-density, biodegradable, and lightweight materials. Natural fibers such as Ixtle, Henequen, and Jute were used as reinforcing fabrics for two biobased epoxy resins from Sicomin®. The manufacture of the biolaminates was carried out through the vacuum-assisted resin infusion process. The mechanical characterization revealed the Jute biolaminates present the highest stiffness and strength, whereas the Henequen biolaminates show high strain values. The rigid and semirigid biolaminates obtained in this work could drive new applications targeting industries that require lightweight and low-cost sustainable composites.

scholarly journals An Experimental Investigation of a Novel Low-Cost Photovoltaic Panel Active Cooling System

Energies ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1448 ◽  
Author(s):  
Alberto Benato ◽  
Anna Stoppato
Keyword(s):  
High Performance ◽  
Cooling System ◽  
Operating Temperature ◽  
Low Cost ◽  
Renewable Energy Sources ◽  
Water Film ◽  
Clean Energy ◽  
Low Carbon ◽  
Low Carbon Economy ◽  
Pv Cooling

Renewable energy sources are the most useful way to generate clean energy and guide the transition toward green power generation and a low-carbon economy. Among renewables, the best alternative to electricity generation from fossil fuels is solar energy because it is the most abundant and does not release pollutants during conversion processes. Despite the photovoltaic (PV) module ability to produce electricity in an eco-friendly way, PV cells are extremely sensitive to temperature increments. This can result in efficiency drop of 0.25%/ ∘ C to 0.5%/ ∘ C. To overcome this issue, manufacturers and researchers are devoted to the improvement of PV cell efficiency by decreasing operating temperature. For this purpose, the authors have developed a low-cost and high-performance PV cooling system that can drastically reduce module operating temperature. In the present work, the authors present a set of experimental measurements devoted to selecting the PV cooling arrangement that guarantees the best compromise of water-film uniformity, module temperature reduction, water-consumption minimization, and module power production maximization. Results show that a cooling system equipped with 3 nozzles characterized by a spraying angle of 90 ∘ , working with an inlet pressure of 1.5 bar, and which remains active for 30 s and is switched off for 120 s, can reduce module temperature by 28 ∘ C and improve the module efficiency by about 14%. In addition, cost per single module of the cooling system is only 15 €.

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