Browsing by Author "Azwani Sofia Ahmad Khiar"
Now showing 1 - 4 of 4
Results Per Page
Sort Options
- Some of the metrics are blocked by yourconsent settings
Publication Conductivity, Dielectric And Modulus Studies of Methylcellulose-NH4TF Polymer Electrolyte(DergiPark, 2018) ;Muhammad Syukri MisenanAzwani Sofia Ahmad KhiarSolid biopolymer electrolyte based on methylcellulose (MC) were prepared with different weight percentage of ammonium triflate (NH4TF) salt via solution casting technique. The film was characterized by impedance spectroscopy to measure its ionic conductivity. Samples with 45% of NH4TF exhibit the highest conductivity of 1.14 x 10-4 S cm-1at ambient. Dielectric data were analysed using complex permittivity and complex electrical modulus for the sample with highest conductivity. Dielectric data proved that the increase in conductivity is mainly due to the increase in number of charge carriers. - Some of the metrics are blocked by yourconsent settings
Publication Development Of Cellulose-based Films Containing Salicylic Acid For Wound Dressing Applications: Fabrication, Properties And In Vitro Assessment(Sage Journals Home, 2024) ;Mohd Ibnu Haikal Ahmad Sohaimy ;Muhammad Amir Amzar Ismail ;Azwani Sofia Ahmad Khiar ;Norizah Mhd Sarbon ;Nora Salina Md Salim ;Hanis Nadia YahyaMohd Ikmar Nizam Mohamad IsaA wound dressing is important to ensure an efficient healing process while protecting the wound area. This research study combined 2-hydroxyethyl cellulose (2HEC)—an etherified cellulose derivative with salicylic acid (SA) to develop a single layer and investigate the 2HEC viability as wound dressing material. Nine different samples with different compositions of SA, from 5 wt.% to 40 wt.% (with an interval of 5 wt.%) and one control sample without adding SA were prepared via the solution casting method. The 2HEC-SA films were studied regarding the effects of SA composition on antimicrobial properties (Staphylococcus aureus) via the well-diffusion method. Additionally, degradability, mechanical properties, X-ray diffraction (XRD), and Fourier transform infrared (FTIR) of 2HEC-SA films have also been tested. The strongest antimicrobial effect of 2HEC-SA film was obtained at 40 wt.% with a 16 mm inhibition zone diameter. There was a noticeable decreasing weight loss pattern in the degradation test and the tensile strength of 2HEC-SA film when the composition of salicylic acid is increased. 2HEC-SA film changes phases from amorphous to crystalline starting at 25 wt.% of salicylic acid as seen through XRD, while FTIR shows that complexation of 2HEC and salicylic acid occurred at 1050 cm−1. - Some of the metrics are blocked by yourconsent settings
Publication Electrical properties of Starch/PEO blend Polymer Electrolytes(Trans Tech Publications Ltd, 2015) ;K. RamlyAzwani Sofia Ahmad KhiarFilms of starch/PEO blends were prepared via solution casting technique and their properties with different amount of ammonium nitrate, NH4NO3 were compared. The measurement of conductivity at room temperature were carried out using impedance spectroscopy. The highest conductivity calculated is found to be 2.81±0.46 x 10-7Scm-1 with addition of 35wt% NH4NO3 . - Some of the metrics are blocked by yourconsent settings
Publication Structural and Electrochemical Properties of Binary ZnO:Al Nanocomposites as Anode for Lithium-ion Batteries(Universiti Sains Islam Malaysia, 2024-10-08) ;Maisurah Mukhtar ;Najiha Hamid ;Syahida Suhaimi ;Azwani Sofia Ahmad Khiar ;Nur Athirah Mohd TaibPeshawa Omer AminIn conventional lithium-ion batteries (LIBs), carbon compounds are commonly utilised as the anode owing to their great performance, low cost, and abundance. However, due to the limited storage capability of pure carbon materials that restrict further improvement of LIBs, zinc oxide (ZnO) has been one of the promising anode materials to be used as an alternative to strengthen the electrochemical performance of LIBs due to its high theoretical capacity of 987 mAh g-1. This study aims to synthesise ZnO:Al nanowires using the hot-tube thermal evaporation method. Three types of samples are made using this method by varying the concentration of 0 wt% (S1), 3wt% (S2), and 6 wt% (S3) of aluminium (Al) during the Al deposition process. The EDX findings indicated that the sample has a high proportion of zinc (Zn) and oxygen (O), with the S3 sample having the highest Al concentration after being deposited. The most substantial diffraction peak for XRD of all samples was found at (101), exhibiting a single crystalline hexagonal structure with optimum growth direction on the c-axis. For EIS analysis, the S3 sample has the lowest bulk resistance and maximum ionic conductivity. In conclusion, the ZnO sample with 3 wt% of Al as a dopant was selected as the optimum result to synthesise a homogenous surface of ZnO:Al with good crystallinity by using a hot-tube thermal evaporation process and giving the best conductivity in electrochemical performance.