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Kanjwal, M.A.,Shawabkeh, A.Q.,Alm, M.,Thomsen, P.,Barakat, N.A.M.,Chronakis, I.S. Elsevier Science Publishers 2016 Materials chemistry and physics Vol.181 No.-
Zinc oxide (ZnO) nanofibers were produced by electrospinning technique and surface coated on silicone elastomer substrate (diameter: 10.0 mm; thickness: 2.0 mm) by a dipcoating method. The obtained hybrid nanoporous matrices were investigated by scanning and transmission electron microscopy (SEM, TEM), X-ray diffraction (XRD) and Fourier transformation infrared techniques (FTIR). These characterizations reveal that the surface morphology of electrospun nanofibers remained intact by the dipcoating technique. The produced hybrid matrices showed high water flux of 9407 L/m<SUP>2</SUP>h, 38% removal rate of dairy effluent (DE) and 2298 ml/g h rate of hydrogen production.
Kanjwal, Muzafar A.,Sheikh, Faheem A.,Nirmala, R.,Macossay, Javier,Kim, Hak-Yong 한국섬유공학회 2011 FIBERS AND POLYMERS Vol.12 No.1
In the present study, we introduce poly(caprolactone) (PCL) nanofibers that contain hydroxyapatite (HAp) nanoparticles (NPs) as a result of an electrospinning process. A simple method that does not depend on additional foreign chemicals has been employed to synthesize HAp NPs through calcination of bovine bones. Typically, a colloidal gel consisting of PCL/HAp has been electrospun to form nanofibers. Physiochemical aspects of prepared nanofibers were characterized for FE-SEM, TEM, XRD and FTIR which confirmed nanofibers were well-oriented and had good dispersion of HAp NPs. Parameters affecting the utilization of the prepared nanofibers in various nano-biotechnological fields have been studied; for instance, the bioactivity of the produced nanofiber mats was investigated while incubated with stimulated body fluid (SBF). The results from incubation of nanofibers in SBF indicate that incorporation of HAp strongly activates precipitation of the apatite-like materials because the HAp NPs act as seeds that accelerate crystallization of the biological HAp from the utilized SBF.
Kanjwal, Muzafar A.,Barakat, Nasser A.M.,Sheikh, Faheem A.,Baek, Woo-Il,Khil, Myung-Seob,Kim, Hak-Yong 한국섬유공학회 2010 FIBERS AND POLYMERS Vol.11 No.5
As titanium oxide is a well-known photocatalyst, we investigated the effects of silver content and nanostructural morphology on the photocatalytic degradation of two dyes, methylene blue and rhodamine B. Two nano-formulations were utilized, including nanofibers and nanoparticles. Silver-grafted titanium oxide nanofibers were synthesized using the electrospinning of silver nitrate/titanium isopropoxide/poly(vinyl acetate) sol-gel. The nanoparticulate form was obtained by calcination of a ground powder prepared from the same electrospun sol-gel. The results affirmed the advantage of the silvergrafted titanium oxide nanostructures over the silver-free ones. Increasing the silver content in the nanofibers led to increases in their surface area, which is an important parameter in heterogeneous catalytic chemical reactions. Therefore, the results strongly suggest the use of silver-grafted titanium oxide in a nanofibrous form. These results further support utilizing Agloaded titanium oxide nanofibers as a photocatalyst.
Kanjwal, M.A.,Alm, M.,Thomsen, P.,Barakat, N.A.M.,Chronakis, I.S. Korean Society of Industrial and Engineering Chemi 2016 Journal of industrial and engineering chemistry Vol.33 No.-
<P>TiO2 and TiO2-Ag nanofibers were produced by electrospinning technique and surface coated on silicone elastomer (diameter: 10.0 mm; thickness: 2.0 mm) by dipcoating method. These coated hybrid nanoporous matrices were characterized by various morphological and physicochemical techniques (like SEM, TEM, XRD, FTIR, EDS and UV). These characterizations reveal that the surface morphology of electrospun nanofibers remain intact by the dipcoating technique. The produced hybrid matrices of TiO2 and TiO2-Ag silicone were utilized as photocatalysts to degrade dairy waste water with an efficient water flux and water photosplitting properties. (C) 2015 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.</P>
Muzafar A. Kanjwal,Nasser A. M. Barakat,Faheem A. Sheikh,박수진,김학용 한국고분자학회 2010 Macromolecular Research Vol.18 No.3
In this study, a new hierarchical nanostructure consisting of zinc oxide (ZnO) and titanium dioxide (TiO2) was prepared by an electrospinning process followed by a hydrothermal technique for use as a photocatalyst for dye degradation. First, the electrospinning of a colloidal solution consisting of titanium isopropoxide/poly(vinyl acetate)/zinc nanoparticles was performed to produce polymeric nanofibers embedded in solid nanoparticles. Calcination of the obtained electrospun nanofiber mats in air at 600 ºC produced TiO2 nanofibers containing ZnO nanoparticles (i.e., ZnO-doped TiO2 nanofibers). The ZnO nanoparticles formed were then exploited as seeds to produce the outgrowth ZnO branches around the TiO2 nanofibers using the hydrothermal technique. Photodegradation of methyl red and rhodamine B (RB) dyes was examined individually using four photocatalysts:ZnO nanoparticles prepared by the same hydrothermal technique, pristine TiO2 nanofibers, ZnO-doped TiO2 nanofibers and the produced nanostructure. The results showed that the introduced ZnO-TiO2 hierarchical nanostructure can eliminate all the methyl red dye within 90 min and the rhodamine B dye within 105 min. However,the other three nanostructures could not totally remove any of the dyes, even after 3 h. Therefore, the introduced nanostructure has higher photocatalytic activity than any of its ingredients individually, which highlights the advantages of synthesizing this novel structure.
Muzafar A. Kanjwal,Martin Alm,Peter Thomsen,Nasser A. M. Barakat,Ioannis S. Chronakis 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
TiO2 and TiO2–Ag nanofibers were produced by electrospinning technique and surface coated on siliconeelastomer (diameter: 10.0 mm; thickness: 2.0 mm) by dipcoating method. These coated hybridnanoporous matrices were characterized by various morphological and physicochemical techniques(like SEM, TEM, XRD, FTIR, EDS and UV). These characterizations reveal that the surface morphology ofelectrospun nanofibers remain intact by the dipcoating technique. The produced hybrid matrices of TiO2and TiO2–Ag silicone were utilized as photocatalysts to degrade dairy waste water with an efficientwater flux and water photosplitting properties.
김학용,Muzafar A. Kanjwal,Faheem A. Sheikh,G. Gana kumar,Dae Kwang Park,Hak Yong Kim 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4
In this study, the performance of titanium oxide to be used as an anode in lithium ion batteries has been improved by producing this oxide in nanofibrous form and outgrowing zinc oxide nanobranches around the titanium oxide nanofibers obtained. First, electrospinning of a colloidal solution consisting of titanium isopropoxide/poly(vinyl acetate) zinc nanoparticles has been achieved to produce polymeric nanofibers embedding solid nanoparticles. Calcination of the electrospun nanofibers mats obtained in air at 600 oC produced TiO2 nanofibers containing ZnO nanoparticles; ZnO-doped TiO2 nanofibers. The ZnO nanoparticles formed have been exploited as seeds to outgrow ZnO branches around the TiO2 nanofibers using a hydrothermal technique. As an anode in a lithium ion battery, the prepared nanostructure exhibited a high rate capacity of 1232 mAhg−1. Considering the distinct physiochemical characteristics of TiO2, the proposed nanostructure might open an avenue for TiO2 to be used for high energy density lithium-ion batteries with higher performances.
Sheikh, Faheem A.,Barakat, Nasser A. M.,Kanjwal, Muzafar A.,Jeon, Seol-Hee,Kang, Hyung-Sub,Kim, Hak-Yong Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of applied polymer science Vol.115 No.6
<P>In this study, we are introducing a new class of Polyurethane (PU) nanofibers containing silver nanoparticles (NPs) by electrospinning. A simple method not depending on the addition of foreign chemicals has been used to self-synthesize of silver NPs in/on PU nanofibers. Typically, a sol−gel consisting of AgNO<SUB>3</SUB>/PU/N,N-dimethylformamide (DMF) has been electrospun and aged for a week, so silver NPs have been created in/on PU nanofibers. Syntheses of silver NPs were carried out by exploiting the reduction ability of the DMF solvent which is the main constituent to obtain PU electrospun nanofibers in decomposition of silver nitrate precursor into silver NPs. Physiochemical characterizations confirmed well oriented nanofibers and good dispersing of pure silver NPs. Various parameters affecting utilizing of the prepared nanofibers on various nano-biotechnological fields have been studied. For instance, the obtained nanofiber mats were checked for mechanical properties which showed the improvement of the tensile strength upon increase in silver NPs content. Moreover, the nanofibers were subjected to 10 times successive washing experiments with using solid to liquid ratio of 3 : 5000 for 25 h, UV spectroscopy analysis reveals no losses of silver NPs from the PU nanofibers. 3T3-L1 fibroblasts were cultured in presence of the designed nanofibers. The morphological features of the cells attached on nanofibers were examined by BIO-SEM, which showed well attachment of cells to fibrous mats. The cytotoxicity results indicated absence of toxic effect on the 3T3-L1 cells after cell culturing. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010</P>
Boron Nitride Nanofibers by the Electrospinning Technique
황희진,Nasser A. M. Barakat,Muzafar A. Kanjwal,Faheem A. Sheikh,김학용,M. F. Abadir 한국고분자학회 2010 Macromolecular Research Vol.18 No.6
An interesting boron nitride ceramic was introduced in nanofibrous form. Boron nitride nanofibers were prepared using a simple and cheap strategy. Calcination of poly(vinyl alcohol) electrospun nanofibers embedded with boron nitride nanoparticles resulted in a nanofibrous form. The electrospun nanofiber mats were prepared by electrospinning of a colloidal solution composed of an aqueous poly(vinyl alcohol) solution and boron nitride nanoparticles. Calcination of the obtained BN/PVA nanofiber mats in an argon atmosphere at 1,000 oC for 5 h resulted in boron nitride nanofibers. The boron nitride nanofibers showed a higher band gap than the nanoparticles; the latter showing a band gap of 2.75 eV. however, the nanofibrous shape enhanced the band gap to 4.52 eV.