Nurul Ain Harmiza Abdullah
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Preferred name
Nurul Ain Harmiza Abdullah
Official Name
Nurul Ain Harmiza, Abdullah
Alternative Name
Harmiza Abdullah, Nurul Ain
Ain Harmiza Abdullah, Nurul
Abdullah, N. A.H.
Main Affiliation
Scopus Author ID
57162370100
Researcher ID
GSC-0490-2022

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  • Publication
    Study of albumen as foaming agent for use in self-healing high strength concrete
    (AIP Publishing, 2023)
    Zuhairiah Zainal Zainal Abidin
    ;
    Muhd Afiq Hizami Abdullah
    ;
    Kunasundari Balakrishnan
    ;
    Muhammad Munsif Ahmad
    ;
    Nurul Ain Harmiza Abdullah
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Q. A. Musa
    Self-healing is an effective solution for sustainable maintenance for concrete to increase its durability against to sensitivity of cracking. As recently, the method of introducing bacterial agent in concrete were modified because of harsh environment in concrete such as small size of pore which cause squeezing of bacteria. In this research, the albumen from egg was used as foaming agent to create voids in concrete matrix. The aerated concrete matrix offer voids to bacteria as concrete will become dense and bacteria would squeezed during hydration process. The effect of albumen as foaming agent in concrete was studied while achieving the high strength aerated concrete type towards its compressive strength, splitting tensile strength and study the voids dissolution (visual) in concrete matrix when incorporation of albumen as foaming agent. The albumen of 2%, 4% and 6% is used as foaming agent (FA) to produce the high strength aerated concrete (HSAC). After 28 days of curing, the compressive and splitting tensile strength of HSAC reduced with the increased of albumen used in concrete. The highest compressive and splitting tensile strength of HSAC were 95.40 MPa and 6.67% respectively with 2% FA in comparison to control. The results of water absorption of HSAC also decreased when higher concentration of albumen used. The sizes of voids created in all samples were less than 15 mm. It can deduced that 2% of foaming agent was ideal to produce optimum characteristics in strength, uniform and size of voids in high strength aerated concrete.
  • Publication
    Structural and mechanical variations of major ampullate silk spun by Malaysian Nephila pilipes spider
    (Springer, 2023)
    Nurul Ain Harmiza Abdullah
    ;
    Ku Syahidah Ku Ismail
    ;
    Khadijah Hanim Abdul Rahman
    ;
    Saiful Bahari Bakarudin
    ;
    Johan Ariff Mohtar
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Boon Yin Khoo
    Major ampullate (MA) silk is a natural biomaterial, spun by spiders with exceptional mechanical characteristics. Most researchers who studied MA silk structure were primarily interested in the properties of a dragline thread that protrudes from the spider’s spigot when being chased by its predator. Apart from the dragline, the MA silk fibers may also be found in three pivot threads of the orb web known as the mooring, framework, and radial. However, it is currently uncertain whether the MA silk in these threads has properties similar to the dragline thread. Thus, this work attempted to compare the properties of MA silk fiber in the mooring, framework, radial, as well as the dragline threads. The MA silk fibers in mooring thread were found to exhibit significant quantity of MA fibers (12 ± 5.0 fibers per thread), thickness diameter (11.7 ± 0.6 μm), and supercontraction effect (high swelling ratio of 18.6), with an outstanding combination of strength (4464 MPa) and toughness (875 MJ/m3), outperforming the dragline thread. Positive correlation was found between the diameter of MA fibers and supercontraction effect and between the number of MA fibers and tensile strength. These findings might be modeled as a fundamental guide in silk spinning for future synthetic MA silk fiber development with extraordinary mechanical performance.
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