Muhamad Qauyum Zawawi Ahamad Suffin
Thumbnail Image
Preferred name
Muhamad Qauyum Zawawi Ahamad Suffin
Official Name
Muhamad Qauyum Zawawi , Ahamad Suffin
Alternative Name
Ahamad Suffin, Muhamad Qauyum Zawawi
Main Affiliation

Research Output

Filters

4 1
1
4
Reset filters

Settings
Now showing 1 - 4 of 4
Thumbnail Image
Publication

The Effects of Self-Polymerized Polydopamine Coating on Mechanical Properties of Polylactic Acid (PLA)–Kenaf Fiber (KF) in Fused Deposition Modeling (FDM)

2023-06-01 , Sanusi Hamat , Syamir Alihan Showkat Ali , Salit M.S. , Yidris N. , Showkat Ali S.A. , Mohd Sabri Hussin , Muhamad Saifuldin Abdul Manan , Muhamad Qauyum Zawawi Ahamad Suffin , Maliki Ibrahim , Ahmad Nabil Mohd Khalil

This research examines the impact of self-polymerized polydopamine (PDA) coating on the mechanical properties and microstructural behavior of polylactic acid (PLA)/kenaf fiber (KF) composites in fused deposition modeling (FDM). A biodegradable FDM model of natural fiber-reinforced composite (NFRC) filaments, coated with dopamine and reinforced with 5 to 20 wt.% bast kenaf fibers, was developed for 3D printing applications. Tensile, compression, and flexural test specimens were 3D printed, and the influence of kenaf fiber content on their mechanical properties was assessed. A comprehensive characterization of the blended pellets and printed composite materials was performed, encompassing chemical, physical, and microscopic analyses. The results demonstrate that the self-polymerized polydopamine coating acted as a coupling agent, enhancing the interfacial adhesion between kenaf fibers and the PLA matrix and leading to improved mechanical properties. An increase in density and porosity was observed in the FDM specimens of the PLA–PDA–KF composites, proportional to their kenaf fiber content. The enhanced bonding between kenaf fiber particles and the PLA matrix contributed to an increase of up to 13.4% for tensile and 15.3% for flexural in the Young’s modulus of PLA–PDA–KF composites and an increase of up to 30% in compressive stress. The incorporation of polydopamine as a coupling agent in the FDM filament composite led to an improvement in tensile, compressive, and flexural stresses and strain at break, surpassing that of pure PLA, while the reinforcement provided by kenaf fibers was enhanced more by delayed crack growth, resulting in a higher strain at break. The self-polymerized polydopamine coatings exhibit remarkable mechanical properties, suggesting their potential as a sustainable material for diverse applications in FDM.

View
No Thumbnail Available
Publication

Facile synthesis of hybrid-polyoxometalates nanocomposite for degradation of cationic and anionic dyes in water treatment

2025-03 , Wei Wei Leow , Alvin Duke , Siti Kartini Enche Ab Rahim , Ng Qi Hwa , Norazharuddin Shah Abdullah , Hoo Peng Yong , Amira Mohd Nasib , Muhamad Qauyum Zawawi Ahamad Suffin

Photocatalysis emerges as a promising method for treating organic dye contaminated wastewater. This process involves the use of photocatalysts through light activation, typically semiconductors such as titanium dioxide (TiO2) or polyoxometalates (POM) to generate reactive species capable of degrading organic pollutants. Several factors influence the photodegradation of ionic and cationic dyes including chemical properties, reaction mechanism and degradation efficiency. This work evaluated photodegradation performance of methyl orange (MO) and malachite green (MG) dyes using hybrid-polyoxometalate (HPOM) photocatalyst. Fourier Transform Infrared Spectroscopy (FTIR) identified the characteristic band at 3463.66 cm–1 (O-H) and 997.74 cm–1 (W-O). Scanning Electron Microscopy (SEM) revealed the presence of rod-like and granular structures in HPOM, representing silver acetate and sodium tungstate. X-ray diffraction (XRD) confirmed characteristic peak of Keggin structure, revealing high crystallinity of HPOM. UV-assisted photodegradation was evaluated on different parameters (initial dye concentration, photocatalyst dosage and pH), highlighting HPOM’s better affinity for degrading cationic dye. The optimum photodegradation conditions for MG and MO dyes were 20 ppm dye concentration, 100 mg photocatalyst dosage, and pH 7 and 8, respectively. The kinetic data was fitted with the Langmuir Hinshelwood kinetic model, indicating pseudo-first-order kinetics. HPOM exhibited a higher rate constant, k for MG (k = 0.0068 min–1) than MO (k = 0.0029 min–1).

View
Thumbnail Image
Publication

Asas tuangan : dalam fabrikasi logam

2014 , Mohd Fitri M.W. , Mohamed Faisol Mohamed Nor , Faizul Che Pa , Muhamad Qauyum Zawawi Ahamad Suffin

Tuangan adalah salah satu teknik penghasilan logam yang telah lama dipraktikkan. Setiap kaedah tuangan mempunyai kelebihan dan keunikan yang tersendiri. Dengan perkembagan dan kemajuan teknologi kejuruteraan, teknik tuangan telah dipertingkatkan dan diperluaskan. Topik yang terkandung di dalam buku ini telah diolah dan disusun bagi tujuan pengajaran dan pembelajaran tentang penghasilan logam melalui teknik tuangan. Dengan terhasilnya penerbitan buku ini, diharapkan dapat membantu dan meningkatkan pemahaman terhadap asas-asas tuangan logam.

View
Thumbnail Image
Publication

Asas seramik

2014 , Alida Abdullah , Shahrizam Saad , Abdullah Chik , Mohd. Mustafa Al Bakri Abdullah , Muhamad Qauyum Zawawi Ahamad Suffin

Buku ini membicarakan beberapa asas dalam bidang seramik. Ia meliputi aspek seperti pengenalan bahan seramik, seramik silikat, kaca dan seramik kaca, komposit matrik seramik, elektroseramik dan seramik oksida. Buku ini sesuai untuk dijadikan sebagai rujukan asas bagi pelajar-pelajar kejuruteraan bahan, kejuruteraan awam, sains dan lain-lain. Ia merangkumi beberapa subjek asas yang biasa dipelajari dalam bidang seramik.

View