Book Chapter

Permanent URI for this collection

https://hdl.handle.net/20.500.14170/182

Browse

Recent Submissions

Now showing 1 - 5 of 8
  • Publication
    The effects of citric acid as crosslinking agent on selected properties of Cassava starch films
    (Trans Tech Publications Ltd., 2023)
    Ana Rose Ramos
    ;
    Ronniel D. Manalo
    ;
    Ong Hui Lin
    ;
    Marvin U. Herrera
    ;
    Mary Donnabelle L. Balela
    Materials made from renewable resources offer a promising strategy for reducing environmental problems. Starch is a well-known alternative among several biodegradable materials due to its availability, cheap cost, and degradability. This research aims to develop a degradable film from cassava starch and use citric acid as the crosslinker. Light transmittance measurement reveals that the films produced have high UV barrier capacity in the UV region and above 80% transmittance values in the visible region. Additionally, it was found that the film with 10% citric acid had a favorable balance of tensile strength, elongation, and fracture stress.
  • Publication
    Extraction of nanocellulose from matured coconut husk
    (Trans Tech Publications Ltd., 2023)
    Yra Marielle M. Jumadiao
    ;
    Ronniel D. Manalo
    ;
    Marvin U. Herrera
    ;
    Ong Hui Lin
    ;
    Mary Donnabelle L. Balela
    Nanocellulose is a promising nanomaterial that can be used in various applications such as reinforcements for composite films. Agricultural lignocellulosic wastes, such as coconut husks, offer great advantages as raw materials for nanocellulose extraction due to their abundance and economic viability. The aim of this study is to extract nanocellulose from matured coconut husk. Nanocellulose was extracted using sulfuric acid hydrolysis and characterized using Atomic Force Microscopy (AFM). Results showed that nanocellulose extracted from matured coconut husk has 2.26% yield with agglomerated, rod-shaped structures. An average aspect ratio of 3.16 ± 1.82 nm was also obtained.
  • Publication
    Assessment of sludge-based microbial fuel cell performance via electrochemical impedance spectroscopy
    (Springer, 2023-06)
    Mohamad Farhan Mohamad Sobri
    ;
    Muhammad Hazwan Hussin
    ;
    Muaz Mohd Zaini Makhtar
    The effective, non-destructive method known as electrochemical impedance spectroscopy (EIS) can be a useful supplement to the methods currently being used to examine microbial fuel cells (MFCs). Its use in MFC research should be investigated further, such as in the examination of MFC internal resistance, electrode materials, catalyst coatings on electrodes and growth of biofilms. Specifically, this chapter details the application of EIS in comprehending electro-chemical processes involved in sludge-based MFC, the biological and/or abiotic variables that restrict power production, with the goal of comprehending and overcoming them.
  • Publication
    Mechanical performance of natural fiber-reinforced alkali-activated composites
    (Elsevier, 2023)
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Pilomeena Arokiasamy
    ;
    Fatin Farhana Kamarzaman
    Alkali-activated material exhibits brittle behavior with low tensile strength and is sensitive to cracking which also affect the durability of the structures. To address this issue, alkali-activated material is frequently made into alkali-activated composites (AACs) by using by fiber reinforcement. Natural fibers have a number of advantages, including lightweight, high strength, and safety in use and processing compared to synthetic fiber. The developed natural fiber-reinforced cementitious composites exhibit outstanding flexural, fracture, and impact resistance. However, the chemical incompatibility that may exist between cement and fiber is the main problem for natural fiber-reinforced cement composites. The pyrolytic behavior of natural fibers can be viewed as a multiconditional coupling in a cement-based environment with high alkalinity and a large variety of mineral species. Thus this review provides in depth analysis on the diverse natural fiber and its utilization in the development of fiber-reinforced AACs (FRAACs). Hence, this would guide in finding the best fiber source for the development of high mechanical strength FRAAC to meet building and construction application.
  • Publication
    A review on the effect of extrusion parameter on 3D printing filament diameter
    (Springer, 2023)
    Krishna Kumar Nitiyah
    ;
    Luqman Musa
    ;
    Mohamad Syahmie Mohamad Rasidi
    ;
    Khairel Rafezi Ahmad
    ;
    Shayfull Zamree Abd. Rahim
    ;
    Rozyanty Rahman
    ;
    Ahmad Azrem Azmi
    Over the years, the extrusion technique has captured the attention of polymer industries by meeting the demand for polymer processing and fabrication of final products. Extrusion is a continuous process, and it has a lot of potential in the increasing polymer sector, especially in the three-dimensional (3D) printing sector. 3D printing is popular because the feedstock filament form is accessible and produce able. The properties of the filament used influence the printed part qualities regardless of the FDM parameters. This study provides information on how extrusion parameters affect the diameter of extruded filaments. This study reviews previous studies on the effect of varied extrusion settings on filament diameter. The review will serve as a resource for researchers in the 3D printing sector to fabricate their filaments for 3D printing. Overall, this paper will provide solutions to overcome issues in obtaining optimal filament diameters for future research projects.
      2  9