Salem Aqeel | Thamar University (original) (raw)
Papers by Salem Aqeel
Al-Azhar Bulletin of Science
Current Chemistry Letters, 2018
A new method of amidation of Carboxy Multi Walled Carbon Nanotubes (MWCNT-COOH) with diamine mono... more A new method of amidation of Carboxy Multi Walled Carbon Nanotubes (MWCNT-COOH) with diamine monomer such as ethylene diamine (EDA) and O-Phenylenediamine (OPDA) was applied by using a solution blending technique. The structure and properties of these composites have been investigated by FTIR, SEM, TEM, XRD, UV, DSC and TGA. The formation of Poly [MWCNT/ Amide] composites was confirmed and the DC electrical conductivity of poly-composites was in the range 4.5×10-6-5.3×10-6 S/cm due to the interaction between the nanotubes.
Advanced Composites and Hybrid Materials, 2017
Polyvinylidene fluoride (PVDF)/polyacrilonitrile (PAN)/multiwalled carbon nanotubes functionalize... more Polyvinylidene fluoride (PVDF)/polyacrilonitrile (PAN)/multiwalled carbon nanotubes functionalized COOH (MWCNTs-COOH) nanocomposites with different contents of MWCNTs were fabricated by using electrospinning and solution cast methods. The interaction of the MWCNTs with the polymer blend was confirmed by a Fourier transform infrared (FTIR) spectroscopy study. The dispersion of the MWCNTs in the polymer blend was studied by scanning electron microscopy. The dispersion of the MWCNTs in the polymer matrix at different compositions has been examined by using scanning electron microscopy (SEM). Both individual and agglomerations of MWCNTs were evident. Multiwalled carbon nanotubes are capable of enhancing the impedance and electrical conductivity of PVDF-PAN/MWCNTs in a wide frequency range at different temperatures. Nanocomposites based on PVDF/PAN and MWCNTs as fillers show a significant enhancement in the electrical conductivity as a function of temperature. In addition, PVDF/PAN with 5.58 wt.% of MWCNTs has a much higher specific energy (129.7Wh/kg) compared to that of PVDF/PAN (15.57 Wh/kg).The results reveal that PVDF/PAN/MWCNTs composites have potential applications for nanogenerators, organic semiconductors, transducers, and electrical energy storage.
Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des don... more Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des donneurs -π, tels que les colorants benzanthrone substitués par des dérivés azométhines en position 3 avec l'iode comme accepteur -σ. Nous avons étudié les réactions de l'accepteur iode avec les donneurs dérivés benzanthrone par photométrie dans le chloroforme et à température ambiante. Les données obtenues indiquent la formation de complexes de transfert de charge 1:1 de formulation [BA].I 2 , où (BA = dérivés benzanthrone). Nous avons déterminé les valeurs de la constante d'équilibre (K), du coefficient d'extinction (ε) et de la force de l'oscillateur (f) pour tous les complexes obtenus dans cette étude. Abstract Charge-transfer complexes (CT-complexes) are formed during the reaction of π-donors, such as substituted benzanthrone dyes substituted with azomethine derivative groups at position 3, with iodine as the σ-acceptor. The reactions of iodine (acceptor) with benza...
Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des don... more Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des donneurs -π, tels que les colorants benzanthrone substitués par des dérivés azométhines en position 3 avec l'iode comme accepteur -σ. Nous avons étudié les réactions de l'accepteur iode avec les donneurs dérivés benzanthrone par photométrie dans le chloroforme et à température ambiante. Les données obtenues indiquent la formation de complexes de transfert de charge 1:1 de formulation [BA].I 2 , où (BA = dérivés benzanthrone). Nous avons déterminé les valeurs de la constante d'équilibre (K), du coefficient d'extinction (ε) et de la force de l'oscillateur (f) pour tous les complexes obtenus dans cette étude. Abstract Charge-transfer complexes (CT-complexes) are formed during the reaction of π-donors, such as substituted benzanthrone dyes substituted with azomethine derivative groups at position 3, with iodine as the σ-acceptor. The reactions of iodine (acceptor) with benza...
Kuwait journal of science & engineering
Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studie... more Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studied. The measurements of viscosity-temperature dependence of poly(n-decyl methacrylate) in n-alkanes (as a model solvent for paranic oils) were applied for model calculation of the speci®c viscosity as a function of temperature and molecular weight. Exchange parameters of poly(n-decyl methacrylate) in n-alkanes have been determined according to Flory's theory and were applied to predict the mixing of polymethylene with poly(n-decyl methacrylate). The positive energy of mixing signi®es mutual incompatibility of these polymers.
Journal of Physics D: Applied Physics, 2012
Al x (Ge2Sb2Te5)100−x materials with different Al contents are systemically studied for applicati... more Al x (Ge2Sb2Te5)100−x materials with different Al contents are systemically studied for applications in phase-change random access memory (PRAM) devices. Al-doped Ge2Sb2Te5 (GST) films show better thermal stability than GST because they do not have phase transformation from face-centred cubic (fcc) to hexagonal at high annealing temperatures. As the Al content increases, the resistance in both amorphous and crystalline phases improves and there is four to five orders of magnitude difference in the resistance between the amorphous and crystalline phases, all of which are helpful in achieving a higher On/OFF ratio for PRAM. In addition, the introduction of Al into the GST films can increase the optical band gap that is favourable to decrease the threshold current of PRAM devices. Raman spectra show that a significant change in the local bonding arrangement around Sb atoms has occurred due to the phase transformation from fcc to hexagonal in the GST film but this can be suppressed by A...
RSC Advances, 2015
A superior hydrophobic piezoelectric solid based on the polyvinylidene fluoride (PVDF)–polyacrilo... more A superior hydrophobic piezoelectric solid based on the polyvinylidene fluoride (PVDF)–polyacrilonitrile (PAN) blend was fabricated. The phase conversion was derived by functionalized carbon nanotubes under a modified electrospinning field.
The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block cop... more The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block copolymer (SEBS) in homologous series of n-alkanes(C 6 -C 16 ) have been studied by means of viscosity. Huggins equation has been employed to determine the intrinsic viscosity of micelles. The temperature dependence of intrinsic viscosity and hydrodynamic radius of SEBS in n-alkanes was observed when temperature varies from 25 o C to 30 o C , above 35 o C the intrinsic viscosity is observed to increase. A great dependence of the hydrodynamic radius and intrinsic viscosity with the carbon number of n-alkane molecules was found at high temperature.
Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studie... more Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studied. The measurements of viscosity-temperature dependence of poly(n-decyl methacrylate) in n-alkanes (as a model solvent for paranic oils) were applied for model calculation of the speci®c viscosity as a function of temperature and molecular weight. Exchange parameters of poly(n-decyl methacrylate) in n-alkanes have been determined according to Flory's theory and were applied to predict the mixing of polymethylene with poly(n-decyl methacrylate). The positive energy of mixing signi®es mutual incompatibility of these polymers.
A modified form of the thermodynamics of Flory ' s equation of state was used for studying the th... more A modified form of the thermodynamics of Flory ' s equation of state was used for studying the thermodynamic mixing of polymerpolymer system. The exchange enthalpy X 1,2 and entropy Q 1,2 parameters of Poly (dimethylsiloxane) in n-alkanes have been calculated and applied to predict the mixing of polymethylene with Poly (dimethylsiloxane).
The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block cop... more The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block copolymer (SEBS) in homologous series of n-alkanes(C 6 -C 16 ) have been studied by means of viscosity. Huggins equation has been employed to determine the intrinsic viscosity of micelles. The temperature dependence of intrinsic viscosity and hydrodynamic radius of SEBS in n-alkanes was observed when temperature varies from 25 o C to 30 o C and the increase above 30 o C . We have found a great dependence of the hydrodynamic radius and intrinsic viscosity with the carbon number of nalkane molecules.
The reported data for the solution properties of poly(methyl, ethyl, butyl, hexyl and lauryl acry... more The reported data for the solution properties of poly(methyl, ethyl, butyl, hexyl and lauryl acrylates) were applied to analysis the excluded volume effect by using Flory ' s, Fixman's, Kurata's and Yamakawa's theory . Parameters A and B, which describe the shortrange and long-range interaction between segments, respectively have been evaluated. Values of expansion factor, as a function of excluded volume parameter, z have been calculated using A and B parameters. According to our results, the 3 -type equation appears to provide a better fit than 5type and 2 -type equation for z>0.5.
Journal of Applied Polymer Science, 2010
Polymer blends based on poly(ethylene glycol), polyacrylonitrile, and multiwalled carbon nanotube... more Polymer blends based on poly(ethylene glycol), polyacrylonitrile, and multiwalled carbon nanotubes (MWNTs) were prepared by the solvent cast technique from the dispersion of the MWNTs in the concentration range 0–3.45 wt %. The interaction of the MWNTs with the polymer blend was confirmed by a Fourier transform infrared (FTIR) spectroscopy study. The thermal properties of the polymer blend with the MWNTs were carried out by means of differential scanning calorimetry (DSC). It was evident from DSC that the polymer/MWNTs had a high thermal stability. Scanning electron microscopy was used to study the dispersion of the MWNTs in the polymer blend. To measure the electrical conductivity, the four-point probe method was used. The electrical conductivity showed an ionic conductivity on the order of 4.4 × 10−4 to 1.2 × 10−2 S/cm. Relative changes in the conductivity with the concentration and temperatures for the samples were analyzed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Polymer Bulletin, 2002
Dilute solutions of poly(n-hexyl methacrylate) have been studied in the homologous series of alka... more Dilute solutions of poly(n-hexyl methacrylate) have been studied in the homologous series of alkanes at different temperatures using viscometry. Mark-Houwink relations in solvents widely differing in their thermodynamical quality were established together with the unperturbed dimensions and their temperature coefficient.
Progress in Organic Coatings, 2010
Polyesteramide resins (PEA) combine the properties of both polyester and polyamide resins. These ... more Polyesteramide resins (PEA) combine the properties of both polyester and polyamide resins. These resins may be modified with various polyhydric alcohols to produce resins with modified properties. Hydroxy ethyl fatty acid amide (HEFA) is the main source of polyhydric alcohol used in polyesteramide resins. New modified polyesteramide resins were prepared and evaluated as anticorrosive varnish for industrial applications by partial replacement of hydroxy ethyl fatty acid amide (HEFA) with polyethylene glycol (PEG 400 ) without affecting the resin constants. Primer formulations based on these modified resins improve the films properties and show good physicochemical and corrosion inhibiting properties.
Al-Azhar Bulletin of Science
Current Chemistry Letters, 2018
A new method of amidation of Carboxy Multi Walled Carbon Nanotubes (MWCNT-COOH) with diamine mono... more A new method of amidation of Carboxy Multi Walled Carbon Nanotubes (MWCNT-COOH) with diamine monomer such as ethylene diamine (EDA) and O-Phenylenediamine (OPDA) was applied by using a solution blending technique. The structure and properties of these composites have been investigated by FTIR, SEM, TEM, XRD, UV, DSC and TGA. The formation of Poly [MWCNT/ Amide] composites was confirmed and the DC electrical conductivity of poly-composites was in the range 4.5×10-6-5.3×10-6 S/cm due to the interaction between the nanotubes.
Advanced Composites and Hybrid Materials, 2017
Polyvinylidene fluoride (PVDF)/polyacrilonitrile (PAN)/multiwalled carbon nanotubes functionalize... more Polyvinylidene fluoride (PVDF)/polyacrilonitrile (PAN)/multiwalled carbon nanotubes functionalized COOH (MWCNTs-COOH) nanocomposites with different contents of MWCNTs were fabricated by using electrospinning and solution cast methods. The interaction of the MWCNTs with the polymer blend was confirmed by a Fourier transform infrared (FTIR) spectroscopy study. The dispersion of the MWCNTs in the polymer blend was studied by scanning electron microscopy. The dispersion of the MWCNTs in the polymer matrix at different compositions has been examined by using scanning electron microscopy (SEM). Both individual and agglomerations of MWCNTs were evident. Multiwalled carbon nanotubes are capable of enhancing the impedance and electrical conductivity of PVDF-PAN/MWCNTs in a wide frequency range at different temperatures. Nanocomposites based on PVDF/PAN and MWCNTs as fillers show a significant enhancement in the electrical conductivity as a function of temperature. In addition, PVDF/PAN with 5.58 wt.% of MWCNTs has a much higher specific energy (129.7Wh/kg) compared to that of PVDF/PAN (15.57 Wh/kg).The results reveal that PVDF/PAN/MWCNTs composites have potential applications for nanogenerators, organic semiconductors, transducers, and electrical energy storage.
Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des don... more Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des donneurs -π, tels que les colorants benzanthrone substitués par des dérivés azométhines en position 3 avec l'iode comme accepteur -σ. Nous avons étudié les réactions de l'accepteur iode avec les donneurs dérivés benzanthrone par photométrie dans le chloroforme et à température ambiante. Les données obtenues indiquent la formation de complexes de transfert de charge 1:1 de formulation [BA].I 2 , où (BA = dérivés benzanthrone). Nous avons déterminé les valeurs de la constante d'équilibre (K), du coefficient d'extinction (ε) et de la force de l'oscillateur (f) pour tous les complexes obtenus dans cette étude. Abstract Charge-transfer complexes (CT-complexes) are formed during the reaction of π-donors, such as substituted benzanthrone dyes substituted with azomethine derivative groups at position 3, with iodine as the σ-acceptor. The reactions of iodine (acceptor) with benza...
Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des don... more Résumé Les complexes de transfert de charge (complexes CT) sont formés durant la réaction des donneurs -π, tels que les colorants benzanthrone substitués par des dérivés azométhines en position 3 avec l'iode comme accepteur -σ. Nous avons étudié les réactions de l'accepteur iode avec les donneurs dérivés benzanthrone par photométrie dans le chloroforme et à température ambiante. Les données obtenues indiquent la formation de complexes de transfert de charge 1:1 de formulation [BA].I 2 , où (BA = dérivés benzanthrone). Nous avons déterminé les valeurs de la constante d'équilibre (K), du coefficient d'extinction (ε) et de la force de l'oscillateur (f) pour tous les complexes obtenus dans cette étude. Abstract Charge-transfer complexes (CT-complexes) are formed during the reaction of π-donors, such as substituted benzanthrone dyes substituted with azomethine derivative groups at position 3, with iodine as the σ-acceptor. The reactions of iodine (acceptor) with benza...
Kuwait journal of science & engineering
Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studie... more Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studied. The measurements of viscosity-temperature dependence of poly(n-decyl methacrylate) in n-alkanes (as a model solvent for paranic oils) were applied for model calculation of the speci®c viscosity as a function of temperature and molecular weight. Exchange parameters of poly(n-decyl methacrylate) in n-alkanes have been determined according to Flory's theory and were applied to predict the mixing of polymethylene with poly(n-decyl methacrylate). The positive energy of mixing signi®es mutual incompatibility of these polymers.
Journal of Physics D: Applied Physics, 2012
Al x (Ge2Sb2Te5)100−x materials with different Al contents are systemically studied for applicati... more Al x (Ge2Sb2Te5)100−x materials with different Al contents are systemically studied for applications in phase-change random access memory (PRAM) devices. Al-doped Ge2Sb2Te5 (GST) films show better thermal stability than GST because they do not have phase transformation from face-centred cubic (fcc) to hexagonal at high annealing temperatures. As the Al content increases, the resistance in both amorphous and crystalline phases improves and there is four to five orders of magnitude difference in the resistance between the amorphous and crystalline phases, all of which are helpful in achieving a higher On/OFF ratio for PRAM. In addition, the introduction of Al into the GST films can increase the optical band gap that is favourable to decrease the threshold current of PRAM devices. Raman spectra show that a significant change in the local bonding arrangement around Sb atoms has occurred due to the phase transformation from fcc to hexagonal in the GST film but this can be suppressed by A...
RSC Advances, 2015
A superior hydrophobic piezoelectric solid based on the polyvinylidene fluoride (PVDF)–polyacrilo... more A superior hydrophobic piezoelectric solid based on the polyvinylidene fluoride (PVDF)–polyacrilonitrile (PAN) blend was fabricated. The phase conversion was derived by functionalized carbon nanotubes under a modified electrospinning field.
The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block cop... more The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block copolymer (SEBS) in homologous series of n-alkanes(C 6 -C 16 ) have been studied by means of viscosity. Huggins equation has been employed to determine the intrinsic viscosity of micelles. The temperature dependence of intrinsic viscosity and hydrodynamic radius of SEBS in n-alkanes was observed when temperature varies from 25 o C to 30 o C , above 35 o C the intrinsic viscosity is observed to increase. A great dependence of the hydrodynamic radius and intrinsic viscosity with the carbon number of n-alkane molecules was found at high temperature.
Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studie... more Dilute solutions of poly(n-decyl methacrylate) in homologous series of n-alkanes have been studied. The measurements of viscosity-temperature dependence of poly(n-decyl methacrylate) in n-alkanes (as a model solvent for paranic oils) were applied for model calculation of the speci®c viscosity as a function of temperature and molecular weight. Exchange parameters of poly(n-decyl methacrylate) in n-alkanes have been determined according to Flory's theory and were applied to predict the mixing of polymethylene with poly(n-decyl methacrylate). The positive energy of mixing signi®es mutual incompatibility of these polymers.
A modified form of the thermodynamics of Flory ' s equation of state was used for studying the th... more A modified form of the thermodynamics of Flory ' s equation of state was used for studying the thermodynamic mixing of polymerpolymer system. The exchange enthalpy X 1,2 and entropy Q 1,2 parameters of Poly (dimethylsiloxane) in n-alkanes have been calculated and applied to predict the mixing of polymethylene with Poly (dimethylsiloxane).
The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block cop... more The dilute solution properties of Polystyrene-Poly(ethylene-butylene)-Polystyrene three block copolymer (SEBS) in homologous series of n-alkanes(C 6 -C 16 ) have been studied by means of viscosity. Huggins equation has been employed to determine the intrinsic viscosity of micelles. The temperature dependence of intrinsic viscosity and hydrodynamic radius of SEBS in n-alkanes was observed when temperature varies from 25 o C to 30 o C and the increase above 30 o C . We have found a great dependence of the hydrodynamic radius and intrinsic viscosity with the carbon number of nalkane molecules.
The reported data for the solution properties of poly(methyl, ethyl, butyl, hexyl and lauryl acry... more The reported data for the solution properties of poly(methyl, ethyl, butyl, hexyl and lauryl acrylates) were applied to analysis the excluded volume effect by using Flory ' s, Fixman's, Kurata's and Yamakawa's theory . Parameters A and B, which describe the shortrange and long-range interaction between segments, respectively have been evaluated. Values of expansion factor, as a function of excluded volume parameter, z have been calculated using A and B parameters. According to our results, the 3 -type equation appears to provide a better fit than 5type and 2 -type equation for z>0.5.
Journal of Applied Polymer Science, 2010
Polymer blends based on poly(ethylene glycol), polyacrylonitrile, and multiwalled carbon nanotube... more Polymer blends based on poly(ethylene glycol), polyacrylonitrile, and multiwalled carbon nanotubes (MWNTs) were prepared by the solvent cast technique from the dispersion of the MWNTs in the concentration range 0–3.45 wt %. The interaction of the MWNTs with the polymer blend was confirmed by a Fourier transform infrared (FTIR) spectroscopy study. The thermal properties of the polymer blend with the MWNTs were carried out by means of differential scanning calorimetry (DSC). It was evident from DSC that the polymer/MWNTs had a high thermal stability. Scanning electron microscopy was used to study the dispersion of the MWNTs in the polymer blend. To measure the electrical conductivity, the four-point probe method was used. The electrical conductivity showed an ionic conductivity on the order of 4.4 × 10−4 to 1.2 × 10−2 S/cm. Relative changes in the conductivity with the concentration and temperatures for the samples were analyzed. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Polymer Bulletin, 2002
Dilute solutions of poly(n-hexyl methacrylate) have been studied in the homologous series of alka... more Dilute solutions of poly(n-hexyl methacrylate) have been studied in the homologous series of alkanes at different temperatures using viscometry. Mark-Houwink relations in solvents widely differing in their thermodynamical quality were established together with the unperturbed dimensions and their temperature coefficient.
Progress in Organic Coatings, 2010
Polyesteramide resins (PEA) combine the properties of both polyester and polyamide resins. These ... more Polyesteramide resins (PEA) combine the properties of both polyester and polyamide resins. These resins may be modified with various polyhydric alcohols to produce resins with modified properties. Hydroxy ethyl fatty acid amide (HEFA) is the main source of polyhydric alcohol used in polyesteramide resins. New modified polyesteramide resins were prepared and evaluated as anticorrosive varnish for industrial applications by partial replacement of hydroxy ethyl fatty acid amide (HEFA) with polyethylene glycol (PEG 400 ) without affecting the resin constants. Primer formulations based on these modified resins improve the films properties and show good physicochemical and corrosion inhibiting properties.