http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Production of Hydrogen and Carbon Nanotubes from Methane
Zein, Sharif Hussein Sharif,Mohamed, Abdul Rahman,Sai, P. Sesha Talpa,Zabidi, Noor Asmawati Mohd 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.6
The decomposition of methane to produce hydrogen and carbon has been investigated experimentally using 15 ㏖% M/20 ㏖% NiO/TiO₂catalysts (where M = MnO_x, FeO, CoO, and CuO). The physical properties of these catalysts were obtained and their performances were evaluated for the conversion of methane and the CO and hydrogen yields. These catalysts were used in the experiments without any pretreatment. XRD patterns and TEM images of these catalysts show the morphological changes that are due to dopant addition. The results indicate the remarkable influence on the catalytic activity provided by doping. While different types of filamentous carbons are formed on the various Ni-containing catalysts, attractive carbon nanotubes were observed on the Mn/Ni/TiO₂-based catalyst. TEM studies on the used catalyst suggest that its stability depends on growth rate and the morphological structure of the formed carbon.
HASSAN ADELI,SHARIF HUSSEIN SHARIF ZEIN,SOON HUAT TAN,ABDUL LATIF AHMAD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.2
In this study the response surface methodology (RSM) coupled with the central composite design (CCD) were used to optimize the mechanical strength properties of poly(L-lactide)/multi-walled carbon nanotube (MWCNT) scaffolds. The scaffolds were prepared by the freeze-extraction method. MWCNTs were incorporated into PLLA composite as a reinforcement agent in order to improve the strength properties of the scaffolds. The effect of process parameters such as ratio of PLLA/(PLLA + MWCNT) (93–100%), solvent amount (100–200 ml), freezing time (5–7 h) and immersing time (2–4 days) were studied using the design of experiment (DOE). Based on CCD, quadratic model was obtained and developed to correlate the process parameters to the strength of the scaffolds. An analysis of variance (ANOVA) was applied to determine the significant factors affecting the experimental design response (strength) of the scaffolds. The predicted values after optimization process were in good agreement with the experimental values. The model was able to accurately predict the response of strength with less than 5% error.
SAIFUL IZWAN ABD RAZAK,SHARIF HUSSEIN SHARIF ZEIN,ABDUL LATIF AHMAD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.6
New ex situ polyaniline (PANI)/MnO2-filled multiwalled carbon nanotubes (MWCNTs) nanocomposites using para-hydroxybenzene sulfonic acid (PHBSA) as a dopant and linker exhibit enhanced electrical conductivity and interfacial interaction. Strong and enhanced interfacial interaction was observed on the surfaces of the filled carbon nanotubes and PANI. Transmission electron microscope (TEM) demonstrated clearly the improved bonding at the interface compared to the nanocomposite without PHBSA.
STRUCTURAL AND INTERACTION PROPERTIES OF ENCAPSULATED MnO_2 NANOWIRES FILLED MWCNTs
SAIFUL IZWAN ABD RAZAK,SHARIF HUSSEIN SHARIF ZEIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.5
Uniform encapsulated MnO_2 nanowires were achieved within the cavity of multiwalled carbon nanotubes (MWCNTs). The Raman spectra revealed a charge-transfer shifts between the MnO_2 particles and the inner tube of MWCNTs. Thin, uniform and continuous MnO_2 was observed with a diameter of 9 nm.
Kean-Khoon Chew,Sharif Hussein Sharif Zein,Abdul Latif Ahmada,David S. McPhail,Muhammad Faiq Abdullah 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
HA was coated on stainless steel (SS) 316L by using electrophoretic deposition to impart corrosion resistance upon SS 316L. Consequently, corrosion behaviour of HA coated SS 316L deposited from applied voltages 10 V to 60 V (denoted as HA/SS316L-10V until -60V) was evaluated in comparison with pristine SS 316L by various electrochemical studies. As results, linear potentiodynamic polarisation result suggested that HA/SS316L-40V exhibits highest open circuit potential indicating that successful protection of HA coating. Additionally, cyclic polarisation studies revealed that HA coated SS 316L improves pitting corrosion resistance. Finally, EIS results demonstrated that higher polarisation resistance and lower capacitance values for HA/SS316L-40V.
SAIFUL IZWAN ABD RAZAK,SHARIF HUSSEIN SHARIF ZEIN,ABDUL LATIF AHMAD 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.1
This paper reports the synthesis and characterization of ternary nanocomposites consisting of polyaniline (PANI), multiwalled carbon nanotubes (MWCNTs) and manganese dioxide (MnO_2) at different MWCNT–MnO2 loadings. The composite electrical percolation threshold is investigated as well. The in situ nanocomposites were characterized by UV-visible, Fourier transform and Raman spectroscopy, thermogravimetric analysis, field emission scanning electron microscopy, and electrical conductivity measurements. The conductivity of the nanocomposite reached up to 78.79 Scm^(-1) with 50 wt.% addition of MWCNT–MnO_2 with good conduction stability and reversibility. The percolation threshold of this nanocomposite was achieved at 0.5 wt.%. Using the scaling law of the percolation theory, it was found that the theoretical conductivity of the nanocomposite exhibited an exponential factor, (t) of 1.38 instead of the universal t value of 2.
MEISAM VALIZADEH KIAMAHALLEH,SHARIF HUSSEIN SHARIF ZEIN,GHASEM NAJAFPOUR,SUHAIRI ABD SATA,SURANI BUNIRAN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.2
Electrode materials are the most important factors to verify the properties of the electrochemical supercapacitor. In this paper, the storage principles and characteristics of electrode materials, including carbon-based materials, transition metal oxides and conducting polymers for supercapacitors are depicted in detail. Other factors such as electrode separator and electrolyte are briefly investigated. Recently, several works are conducted on application of multiwalled carbon nanotubes (MWCNTs) and MWCNTs-based electrode materials for supercapacitors. MWCNTs serve in experimental supercapacitor electrode materials result in specific capacitance (SC) value as high as 135 Fg-1. Addition of pseudocapacitive materials such as transition metal oxides and conducting polymers in the MWCNTs results in electrochemical performance improvement (higher capacitance and conductivity). The nanocomposites of MWCNTs and pseudocapacitive materials are the most promising electrode materials for supercapacitors because of their good electrical conductivity, low cost and high mass density.
MEISAM VALIZADEH KIAMAHALLEH,CHAN IOU CHENG,SUHAIRI ABD SATA,SURANI BUNIRAN,SHARIF HUSSEIN SHARIF ZEIN 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2010 NANO Vol.5 No.3
A novel ternary nanocomposite of nickel-manganese oxides/multi-walled carbon nanotubes (NMO/MWCNTs) coated with poly (3,4-ethylenedioxythiophene)(PEDOT) was prepared by chemical oxidation method. The filling of NMO particles inside MWCNTs and the uniform coating of NMO/MWCNTs with PEDOT intensified the capacitive behavior of MWCNTs. The lowest IR drop (0.1 V) and highest specific capacitance (SC) values of 526.55 F/g of NMO/MWCNTs/PEDOT imply it as highly efficient hybrid supercapacitor materials in 6 M KOH electrolyte.