Hakimah Osman
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Preferred name
Hakimah Osman
Official Name
Hakimah, Osman
Alternative Name
Osman, Hakimah
Osman, H.
Main Affiliation
Scopus Author ID
7005733143
Researcher ID
AAT-9920-2020

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  • Publication
    Synthesis and Characterization of a Novel Nanosized Polyaniline
    ( 2023-12-01)
    Banjar M.F.
    ;
    Joynal Abedin F.N.
    ;
    Fizal A.N.S.
    ;
    Muhamad Sarih N.
    ;
    Hossain M.S.
    ;
    Hakimah Osman
    ;
    Khalil N.A.
    ;
    Ahmad Yahaya A.N.
    ;
    Zulkifli M.
    Polyaniline (PANI) is a conductive polymer easily converted into a conducting state. However, its limited mechanical properties have generated interest in fabricating PANI composites with other polymeric materials. In this study, a PANI–prevulcanized latex composite film was synthesized and fabricated in two phases following chronological steps. The first phase determined the following optimum parameters for synthesizing nanosized PANI, which were as follows: an initial molar ratio of 1, a stirring speed of 600 rpm, a synthesis temperature of 25 °C, purification via filtration, and washing using dopant acid, acetone, and distilled water. The use of a nonionic surfactant, Triton X-100, at 0.1% concentration favored PANI formation in a smaller particle size of approximately 600 nm and good dispersibility over seven days of observation compared to the use of anionic sodium dodecyl sulfate. Ultraviolet–visible spectroscopy (UV-Vis) showed that the PANI synthesized using a surfactant was in the emeraldine base form, as the washing process tends to decrease the doping level in the PANI backbone. Our scanning electron microscopy analysis showed that the optimized synthesis parameters produced colloidal PANI with an average particle size of 695 nm. This higher aspect ratio explained the higher conductivity of nanosized PANI compared to micron-sized PANI. Following the chronological steps to determine the optimal parameters produced a nanosized PANI powder. The nanosized PANI had higher conductivity than the micron-sized PANI because of its higher aspect ratio. When PANI is synthesized in smaller particle sizes, it has higher conductivity. Atomic force microscopy analysis showed that the current flow is higher across a 5 µm2 scanned area of nanosized PANI because it has a larger surface area. Thus, more sites for the current to flow through were present on the nanosized PANI particles.
  • Publication
    Facile study on molar ratio and the significance of particle effect in polymerization of polyaniline
    ( 2024-03-28)
    Banjar M.F.
    ;
    Suphi H.D.
    ;
    Sarizan M.I.
    ;
    Yaacob S.
    ;
    Rahman A.S.A.
    ;
    Khalil N.A.
    ;
    Sapawe N.
    ;
    Hakimah Osman
    ;
    Jaswan Singh M.S.A.
    ;
    Dulaimi A.
    ;
    Zulkifli M.
    The synthesis of polyaniline in varied conditions or parameters produce different outcomes in term of morphologies and particle size. Well defined theory that clearly illustrate complete morphology spectrum remains scarce. Chemical oxidative polymerization of polyaniline (PANI) to be compounded in prevulcanised latex (PVL) film was produced throughout this work. PANI was prepared using aniline in hydrochloric acidic solution (HCl) with the presence of ammonium persulphate (APS) as the oxidizing agent and sodium dodecyl sulphate (SDS) as surfactant. This work proposes an outcome to reveal the significance of different molar ratio of aniline to oxidant at equimolar (0.2: 0.2 M) and non-equimolar (0.3: 0.1 M) with respect to different preparation process yielded different particle size of polymerized PANI. Analysis of microscopy images and particle size analysis (sonicated and unsonicated) reveal that all samples were highly flocculated with particle size of equimolar ranging between 10.0 to 152.45 µm and non-equimolar with 15.0 to 130.0 µm. After sonication applied, the population of smaller particle increased notably. Both ratio of aniline to oxidant formulation yields flocculated particle and quite consistently similar particle size. Microscopy images are present to support the findings.