All Outputs (98)

A review on carbon nanotubes in an environmental protection and green engineering perspective (2010)
Journal Article
Ong, Y. T., Ahmad, A. L., Zein, S. H. S., & Tan, S. H. (2010). A review on carbon nanotubes in an environmental protection and green engineering perspective. Brazilian journal of chemical Engineering, 27(2), 227-242. https://doi.org/10.1590/S0104-66322010000200002

Recent developments in nanotechnologies have helped to benchmark carbon nanotubes (CNTs) as one of the most studied nanomaterials. By taking advantages of CNTs extraordinary physical, chemical and electronic properties, a wide variety of applications... Read More about A review on carbon nanotubes in an environmental protection and green engineering perspective.

Calcium phosphate-based composites as injectable bone substitute materials (2010)
Journal Article
Low, K. L., Tan, S. H., Zein, S. H. S., Roether, J. A., Mouriño, V., & Boccaccini, A. R. (2010). Calcium phosphate-based composites as injectable bone substitute materials. Journal of biomedical materials research. Part B, Applied biomaterials, 94(1), 273-286. https://doi.org/10.1002/jbm.b.31619

A major weakness of current orthopedic implant materials, for instance sintered hydroxyapatite (HA), is that they exist as a hardened form, requiring the surgeon to fit the surgical site around an implant to the desired shape. This can cause an incre... Read More about Calcium phosphate-based composites as injectable bone substitute materials.

Preparation and properties of perovskite-dispersed titania membranes (2010)
Journal Article
Sani, N. A., Ahmad, A. L., & Zein, S. H. (2010). Preparation and properties of perovskite-dispersed titania membranes. Journal of applied sciences (Asian Network for Scientific Information), 10(12), 1097-1103. https://doi.org/10.3923/jas.2010.1097.1103

Defect-free SrCo 0 8 Fe 0 2 0 3 perovskite-dispersed titania (perovskite-titania) membrane was successfully prepared by sol-gel method combined with wet impregnation process. In this experiment, titania membrane was immersed in a perovskite solution,... Read More about Preparation and properties of perovskite-dispersed titania membranes.

MnO2-filled multiwalled carbon nanotube/polyaniline nanocomposites with enhanced interfacial interaction and electronic propertiesMnO2-filled multiwalled carbon nanotube/polyaniline nanocomposites with enhanced interfacial interaction and electronic properties (2009)
Journal Article
Razak, S. I. A., Ahmad, A. L., Zein, S. H. S., & Boccaccini, A. R. (2009). MnO2-filled multiwalled carbon nanotube/polyaniline nanocomposites with enhanced interfacial interaction and electronic propertiesMnO2-filled multiwalled carbon nanotube/polyaniline nanocomposites with enhanced interfacial interaction and electronic properties. Scripta materialia, 61(6), 592-595. https://doi.org/10.1016/j.scriptamat.2009.05.030

This paper reports the synthesis and characterization of new ternary nanocomposites combining polyaniline (PANI), multiwalled carbon nanotubes (MWCNTs) and manganese dioxide (MnO2). MnO2 was successfully incorporated within the MWCNTs. In situ polyme... Read More about MnO2-filled multiwalled carbon nanotube/polyaniline nanocomposites with enhanced interfacial interaction and electronic propertiesMnO2-filled multiwalled carbon nanotube/polyaniline nanocomposites with enhanced interfacial interaction and electronic properties.

Effect of multi-walled carbon nanotubes on mechanical properties of feldspar filled polypropylene composites (2008)
Journal Article
Ansari, M. N., Ismail, H., & Zein, S. H. (2009). Effect of multi-walled carbon nanotubes on mechanical properties of feldspar filled polypropylene composites. Journal of Reinforced Plastics and Composites, 28(20), 2473-2485. https://doi.org/10.1177/0731684408092377

In this study, the effect of multi-walled carbon nanotube (MWCNT) reinforcement on mechanical and morphological properties of MWCNT reinforced feldspar/polypropylene composites was investigated. The composites were compounded in a Polydrive Thermo Ha... Read More about Effect of multi-walled carbon nanotubes on mechanical properties of feldspar filled polypropylene composites.

Synthesis and characterization of TiO2 coated multiwalled carbon nanotubes using a sol gel method (2008)
Journal Article
Sharif Zein, S. H., & Boccaccini, A. R. (2008). Synthesis and characterization of TiO2 coated multiwalled carbon nanotubes using a sol gel method. Industrial & engineering chemistry research, 47(17), 6598-6606. https://doi.org/10.1021/ie701770q

A considerable improvement in the quality of TiO 2 coatings on multiwalled carbon nanotubes (MWNTs) was obtained by introducing a three-step purification and functionalization process which combines oxidation in air followed by sulfuric acid refluxe... Read More about Synthesis and characterization of TiO2 coated multiwalled carbon nanotubes using a sol gel method.

The effect of reduction temperature on Co-Mo/Al2O3catalysts for carbon nanotubes formation (2007)
Journal Article
Chai, S. P., Zein, S. H. S., & Mohamed, A. R. (2007). The effect of reduction temperature on Co-Mo/Al2O3catalysts for carbon nanotubes formation. Applied catalysis. A, General, 326(2), 173-179. https://doi.org/10.1016/j.apcata.2007.04.020

Catalyst reduction temperature was observed to affect the yield and diameter uniformity of carbon nanotubes (CNTs) produced on Co-Mo/Al 2 O 3 catalysts. The results show that on the whole, the reduced catalysts gave higher carbon yield. The CNTs obta... Read More about The effect of reduction temperature on Co-Mo/Al2O3catalysts for carbon nanotubes formation.

Synthesis of manganese oxide/carbon nanotube nanocomposites using wet chemical method (2007)
Journal Article
Zein, S. H. S., Yeoh, L. C., Chai, S. P., Mohamed, A. R., & Mahayuddin, M. E. M. (2007). Synthesis of manganese oxide/carbon nanotube nanocomposites using wet chemical method. Journal of Materials Processing Technology, 190(1-3), 402-405. https://doi.org/10.1016/j.jmatprotec.2007.03.104

Novel material with peculiar properties can be obtained by introducing foreign materials into the inner cavity of carbon nanotubes. It has been suggested that the materials encapsulated into the hollow regions of carbon nanotubes could result in a si... Read More about Synthesis of manganese oxide/carbon nanotube nanocomposites using wet chemical method.

Synthesizing carbon nanotubes and carbon nanofibers over supported-nickel oxide catalysts via catalytic decomposition of methane (2007)
Journal Article
Chai, S. P., Zein, S. H. S., & Mohamed, A. R. (2007). Synthesizing carbon nanotubes and carbon nanofibers over supported-nickel oxide catalysts via catalytic decomposition of methane. Diamond and related materials, 16(8), 1656-1664. https://doi.org/10.1016/j.diamond.2007.02.011

Supported-NiO catalysts were tested in the synthesis of carbon nanotubes and carbon nanofibers by catalytic decomposition of methane at 550 °C and 700 °C. Catalytic activity was characterized by the conversion levels of methane and the amount of carb... Read More about Synthesizing carbon nanotubes and carbon nanofibers over supported-nickel oxide catalysts via catalytic decomposition of methane.

Study of hydrogen storage by carbonaceous material at room temperature (2007)
Journal Article
Hassan, N. H. A., Mohamed, A. R., & Zein, S. H. S. (2007). Study of hydrogen storage by carbonaceous material at room temperature. Diamond and related materials, 16(8), 1517-1523. https://doi.org/10.1016/j.diamond.2006.12.042

Recently, many studies have been reported about a variety of carbon materials in adsorbing hydrogen. Regarding that, hydrogen adsorption in different carbonaceous materials was investigated at room temperature, 298 K and three different pressures whi... Read More about Study of hydrogen storage by carbonaceous material at room temperature.

Production of High Purity Multi-Walled Carbon Nanotubes from Catalytic Decomposition of Methane (2006)
Journal Article
Hong, K. B., Ismail, A. A. B., Mahayuddin, M. E. B. M., Mohamed, A. R., & Zein, S. H. S. (2006). Production of High Purity Multi-Walled Carbon Nanotubes from Catalytic Decomposition of Methane. Journal of natural gas chemistry / Chengdu Institute of Organic Chemistry, the Chinese Academy of Sciences, 15(4), 266-270. https://doi.org/10.1016/S1003-9953%2807%2960004-8

Acid-based purification process of multi-walled carbon nanotubes (MWNTs) produced via catalytic decomposition of methane with NiO/TiO 2 as a catalyst is described. By combining the oxidation in air and the acid refluxes, the impurities, such as amorp... Read More about Production of High Purity Multi-Walled Carbon Nanotubes from Catalytic Decomposition of Methane.

COx-Free Hydrogen and Carbon Nanofibers Produced from Direct Decomposition of Methane on Nickel-Based Catalysts (2006)
Journal Article
Chai, S. P., Zein, S. H. S., & Mohamed, A. R. (2006). COx-Free Hydrogen and Carbon Nanofibers Produced from Direct Decomposition of Methane on Nickel-Based Catalysts. Journal of natural gas chemistry / Chengdu Institute of Organic Chemistry, the Chinese Academy of Sciences, 15(4), 253-258. https://doi.org/10.1016/S1003-9953%2807%2960002-4

Direct decomposition of methane was carried out using a fixed-bed reactor at 700 °C for the production of CO x -free hydrogen and carbon nanofibers. The catalytic performance of NiO-M/SiO 2 catalysts (where M=AgO, CoO, CuO, FeO, MnO x and MoO) in met... Read More about COx-Free Hydrogen and Carbon Nanofibers Produced from Direct Decomposition of Methane on Nickel-Based Catalysts.

Moderate temperature synthesis of single-walled carbon nanotubes on alumina supported nickel oxide catalyst (2006)
Journal Article
Chai, S. P., Zein, S. H. S., & Mohamed, A. R. (2007). Moderate temperature synthesis of single-walled carbon nanotubes on alumina supported nickel oxide catalyst. Materials letters, 61(16), 3519-3521. https://doi.org/10.1016/j.matlet.2006.11.108

A simple nickel oxide catalyst has been developed in synthesizing single-walled carbon nanotubes (SWNTs) at moderate temperature. The catalyst used in the experiment was without a preceding reduction in hydrogen flow. The synthesis of SWNTs was perfo... Read More about Moderate temperature synthesis of single-walled carbon nanotubes on alumina supported nickel oxide catalyst.

Formation of Y-junction carbon nanotubes by catalytic CVD of methane (2006)
Journal Article
Chai, S. P., Zein, S. H. S., & Mohamed, A. R. (2006). Formation of Y-junction carbon nanotubes by catalytic CVD of methane. Solid state communications, 140(5), 248-250. https://doi.org/10.1016/j.ssc.2006.08.006

Y-junction carbon nanotubes were grown by catalytic CVD of methane at 700 {ring operator} C on NiO-CuO-MoO(7:2:1) (w/w/w)/SiO 2 catalyst. For comparison, NiO-CuO(8:2) (w/w)/SiO 2 and NiO-MoO(8:2) (w/w)/SiO 2 catalysts were tested for carbon nanotube... Read More about Formation of Y-junction carbon nanotubes by catalytic CVD of methane.

Preparation of carbon nanotubes over cobalt-containing catalysts via catalytic decomposition of methane (2006)
Journal Article
Chai, S. P., Zein, S. H. S., & Mohamed, A. R. (2006). Preparation of carbon nanotubes over cobalt-containing catalysts via catalytic decomposition of methane. Chemical Physics Letters, 426(4-6), 345-350. https://doi.org/10.1016/j.cplett.2006.05.026

Decomposition of methane into carbon nanotubes over CoO catalysts supported on various catalyst supports at 550 °C and 700 °C was investigated. The effect of catalyst promoters on the supported CoO catalysts at 700 °C was also examined. Electron micr... Read More about Preparation of carbon nanotubes over cobalt-containing catalysts via catalytic decomposition of methane.

Screening of metal oxide catalysts for carbon nanotubes and hydrogen production via catalytic decomposition of methane (2006)
Presentation / Conference Contribution
Zein, S. H., Mohamed, A. R., & Chai, S. P. Screening of metal oxide catalysts for carbon nanotubes and hydrogen production via catalytic decomposition of methane

A number of catalysts prepared from transition metals such as copper (Cu), iron (Fe), nickel (Ni), cobalt (Co) and manganese (Mn) on TiO 2 support were tested for the decomposition of methane into hydrogen and carbon. These catalysts were used in the... Read More about Screening of metal oxide catalysts for carbon nanotubes and hydrogen production via catalytic decomposition of methane.

Mn/Ni/TiO2 catalyst for the production of hydrogen and carbon nanotubes from methane decomposition (2004)
Journal Article
Zein, S. H. S., & Mohamed, A. R. (2004). Mn/Ni/TiO2 catalyst for the production of hydrogen and carbon nanotubes from methane decomposition. Energy and Fuels, 18(5), 1336-1345. https://doi.org/10.1021/ef0340864

The decomposition of methane into carbon and hydrogen over 15 mol % MnO x /20 mol %NiO/ TiO 2 catalysts was investigated. The effects of catalyst synthesis and pretreatment of 15 mol % MnO x /20 mol % NiO/TiO 2 catalysts for the activity and morpho... Read More about Mn/Ni/TiO2 catalyst for the production of hydrogen and carbon nanotubes from methane decomposition.

Kinetic studies on catalytic decomposition of methane to hydrogen and carbon over Ni/TiO2catalyst (2004)
Journal Article
Zein, S. H. S., Mohamed, A. R., & Sai, P. S. T. (2004). Kinetic studies on catalytic decomposition of methane to hydrogen and carbon over Ni/TiO2catalyst. Industrial & engineering chemistry research, 43(16), 4864-4870. https://doi.org/10.1021/ie034208f

Experiments were conducted in a fixed-bed catalytic reactor to study the decomposition of methane to hydrogen and carbon over 13 wt % Ni/TiO 2 -based catalyst. The variables include the volumetric flow rate of reactant (relative partial pressures of... Read More about Kinetic studies on catalytic decomposition of methane to hydrogen and carbon over Ni/TiO2catalyst.