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Obaid, M.,Ghouri, Zafar Khan,Fadali, Olfat A.,Khalil, Khalil Abdelrazek,Almajid, Abdulhakim A.,Barakat, Nasser A. M. American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.7
<P>Novel amorphous silica nanoparticle-incorporated poly(vinylidine fluoride) electrospun nanofiber mats are introduced as effective membranes for forward osmosis desalination technology. The influence of the inorganic nanoparticle content on water flux and salt rejection was investigated by preparing electrospun membranes with 0, 0.5, 1, 2, and 5 wt % SiO2 nanoparticles. A laboratory-scale forward osmosis cell was utilized to validate the performance of the introduced membranes using fresh water as a feed and different brines as draw solution (0.5, 1, 1.5, and 2 M NaCl). The results indicated that the membrane embedding 0.5 wt % displays constant salt rejection of 99.7% and water flux of 83 L m(-2) h(-1) with 2 M NaCl draw solution. Moreover, this formulation displayed the lowest structural parameter (S = 29.7 mu m), which represents approximately 69% reduction compared to the pristine membrane. Moreover, this study emphasizes the capability of the electrospinning process in synthesizing effective membranes as the observed water flux and average salt rejection of the pristine poly(vinylidine fluoride) membrane was 32 L m(-2) h(-1) (at 2 M NaCl draw solution) and 99%, respectively. On the other hand, increasing the inorganic nanoparticles to 5 wt % showed negative influence on the salt rejection as the observed salt flux was 1651 mol m(-2) h(-1) Besides the aforementioned distinct performance, studies of the mechanical properties, porosity, and wettability concluded that the introduced membranes are effective for forward osmosis desalination technology.</P>
Dar, M.A.,Nam, S.H.,Abdo, H.S.,Almajid, A.A.,Kim, D.W.,Qurashi, A.,Kim, W.B. Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.695 No.-
<P><B>Abstract</B></P> <P>The self-assembled Co<SUB>3</SUB>O<SUB>4</SUB> microspheres made of nanoplatelets were prepared by a novel and simple solvothermal route. The crystal structure and morphology were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM), respectively. The FESEM shows that the average diameter of the microspheres is about 8 μm and the thickness of individual nanoplatelets is 30–70 nm. X-ray photoelectron spectroscopy (XPS) studies reveal two strong peaks appearing at 780.6 and 797.0 eV, corresponding to the core level electrons for Co 2p<SUB>3/2</SUB> and Co 2p<SUB>1/2</SUB>, which are characteristic XPS peaks of Co<SUB>3</SUB>O<SUB>4</SUB> phase. The electrochemical properties of cobalt oxide nanoplatelets modified electrodes were scrutinized by cyclic voltammetry (CV) and charge-discharge profile with cycles, showing a stable reversible capacity of 620 mA h/g after 40 cycles.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of self-assembled Co<SUB>3</SUB>O<SUB>4</SUB> nanoplatelets via a simple solvothermal route. </LI> <LI> XPS studies reveals the two peaks, corresponding to the core level electrons of Co 2p<SUB>3/2</SUB> and Co 2p<SUB>1/2</SUB>. </LI> <LI> Co<SUB>3</SUB>O<SUB>4</SUB> anode in Li-ion batteries showed a reversible capacity of 620 mA h/g after 40 cycles. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Yang, Song-Hee,Zaidi, Shabi Abbas,Cheong, Won-Jo,ALOthman, Zeid A.,ALMajid, Abdullah M. Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
In this study, we have expanded the applicability of the pre-established generalized preparation protocol to MIPs with a neutral template. The ($4S,5R$hyl-5-phenyl-2-oxazolidinone MIP layer was formed inside a pretreated and silanized fused silica capillary, and its chiral separation performance was examined. Optimization of chiral separation was also carried out. This is the very first report of somewhat successful application of the generalized preparation protocol to a MIP with a genuine neutral template.
Ali, F.,Cheong, W.J.,ALOthman, Z.A.,ALMajid, A.M. Elsevier 2013 Journal of chromatography A Vol.1303 No.-
Partially sub-2μm porous silica monolith particles have been synthesized by a renovated procedure and modified to polystyrene coated silica particles with excellent separation efficiency when used as chromatographic media. In the procedure of preparing silica monolith particles in this study, subtle control of formulation of the reaction mixture and multi-step heating followed by calcination, without any washing and sieving process, enabled formation of silica particles characterized by proper particle and pore size distribution for high separation efficiency. 3-Chloropropyl trimethoxysilane was used as the halogen terminal spacer to combine the initiator to silica particles. Uniform and thin coating of polystyrene layer on initiator attached silica particles was formed via reversible addition-fragmentation chain transfer (RAFT) polymerization. Micro-columns (1.0mm ID and 300mm length) were packed with the resultant phase and their chromatographic performance was elucidated by HPLC. A mobile phase of 60/40 (v/v) acetonitrile/water containing 0.1% TFA and a flow rate of 15μL/min were found to be the optimized conditions leading to number of theoretical plates close to 50,000 (165,000m<SUP>-1</SUP>). This is the very first study to get such highly efficient HPLC columns using a silica monolith particulate stationary phase.
양송희,샤비,정원조,Zeid A. AlOthman,Abdullah M. ALMajid 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.5
In this study, we have expanded the applicability of the pre-established generalized preparation protocol to MIPs with a neutral template. The (4S,5R)-4-methyl-5-phenyl-2-oxazolidinone MIP layer was formed inside a pretreated and silanized fused silica capillary, and its chiral separation performance was examined. Optimization of chiral separation was also carried out. This is the very first report of somewhat successful application of the generalized preparation protocol to a MIP with a genuine neutral template.
Motlak, Moaaed,Barakat, Nasser A.M.,Akhtar, M. Shaheer,El-Deen, Ahmed G.,Obaid, M.,Kim, Cheol Sang,Khalil, Khalil Abdelrazek,Almajid, Abdulhakim A. Elsevier 2015 CHEMICAL ENGINEERING JOURNAL -LAUSANNE- Vol.268 No.-
<P><B>Abstract</B></P> <P>For DSSCs application, highly efficient photoelectrode based on nitrogen (N) and graphene oxide (GO) co-incorporated TiO<SUB>2</SUB> nanofibers were synthesized successfully by two simple successive methods; electrospinning followed by hydrothermal processes. The influence of the N and GO co-incorporation on the morphology, crystal structure and optical behavior of TiO<SUB>2</SUB> nanofibers were characterized by various advanced techniques. The results showed that the modified TiO<SUB>2</SUB> nanofibers exhibit higher conversion energy in comparison to the mono-incorporated and pristine TiO<SUB>2</SUB> nanofibers. Optical and electrochemical properties study indicated that, compared to other GO contents, the 0.5wt% GO content provides higher surface area, more active sites for the dye absorption, and numerous hot electron transport paths to the FTO substrate which consequently improves the cell performance. On the other hand, N atoms incorporation causes positive shift of the flat band potentials (<I>V</I> <SUB>fb</SUB>) which leads to fast electron transport in TiO<SUB>2</SUB> nanofiber films and inhibits the charge recombination rate of photon-generated electrons. Accordingly, TiO<SUB>2</SUB> nanofibers co-incorporated by nitrogen and GO (0.5wt%) exhibit the best performance as photoanode in the DSSC, the corresponding conversion efficiency was 5.72% compared to 4.52% and 1.54% in case of nitrogen-free 0.5wt% GO-incorporated and pristine TiO<SUB>2</SUB> nanofibers, respectively. Overall, this study introduces nitrogen and graphene oxide co-incorporation in the titanium oxide nanofibers as novel strategy for enhancing the solar-to-electrical energy conversion in the DSSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen and graphene oxide co-incorporated TiO<SUB>2</SUB> are introduced by simple methods. </LI> <LI> The introduced co-incorporated TiO<SUB>2</SUB> nanofibers reveal high efficiency; 5.72%. </LI> <LI> Co-incorporation leads to obtain high filling factor (FF=0.65). </LI> <LI> Co-incorporation has been used as novel strategy in the DSSCs. </LI> </UL> </P>