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Start Over Author "Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman" Publisher mdpi ag
2 results on '"Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman"'

1. Anticorrosive and Microbial Inhibition Performance of a Coating Loaded with Andrographis paniculata on Stainless Steel in Seawater

Author

Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman, Maria Fazira Mohd Fekeri, Nursabrina Amirah Mohd Nasir, Nur Aiman Syafiq Mohd Hamidi, Mohamad Zahid Baharom, Azila Adnan, Muhamad Syaizwadi Shaifudin, Wan Rafizah Wan Abdullah, Wan Mohd Norsani Wan Nik, Fariza Hanim Suhailin, Khamirul Amin Matori, Chen Soo Kien, Mohd Hafiz Mohd Zaid, and Mohd Sabri Mohd Ghazali

Subjects
paint coatings, microbiological corrosion, Andrographis paniculata, stainless steel, seawater, Organic chemistry, QD241-441
Abstract

With the trend for green technology, the study focused on utilizing a forgotten herb to produce an eco-friendly coating. Andrographis paniculata or the kalmegh leaves extract (KLE) has been investigated for its abilities in retarding the corrosion process due to its excellent anti-oxidative and antimicrobial properties. Here, KLE was employed as a novel additive in coatings and formulations were made by varying its wt%: 0, 3, 6, 9, and 12. These were applied to stainless steel 316L immersed in seawater for up to 50 days. The samples were characterized and analyzed to measure effectiveness of inhibition of corrosion and microbial growth. The best concentration was revealed to be 6 wt% KLE; it exhibited the highest performance in improving the ionic resistance of the coating and reducing the growth of bacteria.

Published
2021
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2. Synergistic Effects of Pr6O11 and Co3O4 on Electrical and Microstructure Features of ZnO-BaTiO3 Varistor Ceramics

Author

Maria Fazira Mohd Fekeri, Mohd Hafiz Mohd Zaid, Nor Kamilah Saat, Wan Rafizah Wan Abdullah, Mohd Sabri Mohd Ghazali, Syara Kassim, Wan Mohamad Ikhmal Wan Mohamad Kamaruzzaman, Nur Quratul Aini Ismail, Khamirul Amin Matori, and Muhamad Syaizwadi Shaifudin

Subjects
Materials science, Pr6O11, 02 engineering and technology, 01 natural sciences, lcsh:Technology, Varistor ceramics, 0103 physical sciences, ZnO-BaTiO3, Electrical performance, Breakdown voltage, General Materials Science, Composite material, lcsh:Microscopy, varistor ceramics, lcsh:QC120-168.85, 010302 applied physics, Dopant, lcsh:QH201-278.5, lcsh:T, Doping, Varistor, Co3O4, 021001 nanoscience & nanotechnology, Microstructure, lcsh:TA1-2040, electrical properties, lcsh:Descriptive and experimental mechanics, lcsh:Electrical engineering. Electronics. Nuclear engineering, 0210 nano-technology, lcsh:Engineering (General). Civil engineering (General), lcsh:TK1-9971, Voltage
Abstract

This paper investigated the effects of Pr6O11 and Co3O4 on the electrical properties of ZnO-BaTiO3 varistor ceramics. The Pr6O11 doping has a notable influence on the characteristics of the nonlinear coefficient, varistor voltage, and leakage current where the values varied from 2.29 to 2.69, 12.36 to 68.36 V/mm and 599.33 to 548.16 µA/cm2, respectively. The nonlinear varistor coefficient of 5.50 to 7.15 and the varistor voltage of 7.38 to 8.10 V/mm was also influenced by the use of Co3O4 as a dopant. When the amount of Co3O4 was above 0.5 wt.%, the leakage current increased from 202.41 to 302.71 μA/cm2. The varistor ceramics with 1.5 wt.% Pr6O11 shows good nonlinear electrical performance at higher breakdown voltage and reduced the leakage current of the ceramic materials. Besides, the varistor sample that was doped with 0.5 wt.% Co3O4 was able to enhance the nonlinear electrical properties at low breakdown voltage with a smaller value of leakage current.

Published
2021

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