2021 International Bhurban Conference on Applied Sciences and Technologies (IBCAST)
in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized t... more in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized to maximize the electroactive β-phase. PVDF/clay, PVDF/clay/PZT (lead zirconate titanate) and PVDF/PZT composites series with PZT loading of (0–40 %) were fabricated using melt casting technique. PVDF/clay/PZT composites parameters were optimized as a function of micro sized PZT filler concentrations and montmorillonite clay incorporated in the PVDF matrix with different surface modifications. As the reported literature on PVDF/PZT composites for enhancement of β-phase is rare, thus a possible spectrum of PVDF/PZT formulations containing different weight percentages of PZT powder (0, 10, 20, 30 and 40 wt. %) were developed and studied. All the composites were made by melt mixing and casted into flexible and homogeneous thin films. Presence of electroactive β-phase was confirmed by different characterization techniques including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA) and Differential scanning calorimetry (DSC). The gradual but noteworthy increment in polar β-phase was observed by fixing the composition of PVDF and nanoclay but varying the concentration of PZT. Further, it was observed that the change of organic surface modifications in montmorillonite clay not only improved the dispersion of filler in PVDF matrix but also maximized the electroactive β-phase.
Development of an ultra-sensitive electrochemical platform for the simultaneous detection of two ... more Development of an ultra-sensitive electrochemical platform for the simultaneous detection of two high blood pressure drugs.
Substituents play a major role in influencing the reactivity and biological activity of aromatic ... more Substituents play a major role in influencing the reactivity and biological activity of aromatic compounds. Substituents affect the conductivity of molecular electronic and photoresponsive switches, light harvesting dye-sensitized solar cells and organic electroluminescent devices. A number of quantum mechanical methods corresponding to stabilization energy, charge of substituent active region, energy dispersive analysis, and molecular electrostatic potential help in the description of substituent effect in aromatic systems. In the present work we carried out computational studies for the estimation of chemical and structural properties of a chemical library of nine ortho substituted naphthoic acids. The chemical reactivity of the selected substituted naphthoic acids was assessed from a number of physicochemical properties such as total energy, HOMO-LUMO gap, chemical hardness, binding energy, ionization potential, electron affinity, electronegativity, electrochemical potential, glo...
in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized t... more in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized to maximize the electroactive -phase. PVDF/clay, PVDF/clay/PZT (lead zirconate titanate) and PVDF/PZT composites series with PZT loading of (0-40 %) were fabricated using melt casting technique. PVDF/clay/PZT composites parameters were optimized as a function of micro sized PZT filler concentrations and montmorillonite clay incorporated in the PVDF matrix with different surface modifications. As the reported literature on PVDF/PZT composites for enhancement of -phase is rare, thus a possible spectrum of PVDF/PZT formulations containing different weight percentages of PZT powder (0, 10, 20, 30 and 40 wt. %) were developed and studied. All the composites were made by melt mixing and casted into flexible and homogeneous thin films. Presence of electroactive -phase was confirmed by different characterization techniques including X-ray diffraction (XRD), Fourier transform infrared spectrosc...
This study reports the synthesis, characterization, and mercuric ion detection ability of novel t... more This study reports the synthesis, characterization, and mercuric ion detection ability of novel tribenzamides having flexible and rigid moieties.
Herein, we present a greener approach to achieve an ultrasensitive, selective, and viable sensor ... more Herein, we present a greener approach to achieve an ultrasensitive, selective, and viable sensor engineered by amino acids as a recognition layer for simultaneous electrochemical sensing of toxic heavy metals (HMs). Electrochemical techniques like electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and square-wave anodic stripping voltammetry (SWASV) were applied to demonstrate sensing capabilities of the designed analytical tool. The comparative results of different amino acids demonstrate alanine’s superior performance with a well-resolved and enhanced current signal for target metal ions due to strong complexation of its functional moieties. The working conditions for alanine-modified GCE were optimized by investigating the effect of alanine concentration, different supporting electrolytes, pH values, accumulation potentials, and time. The limits of detection for Zn2+, Cd2+, Cu2+, and Hg2+ were found to be 8.92, 5.77, 3.01, and 5.89 pM, respectively. The alanine-modified electrode revealed absolute discrimination ability, stability, and ultrasensitivity toward metal ions even in the presence of multifold interfering species. Likewise, greener modifier-designed electrodes possessed remarkable electrocatalytic activity, cost affordability, reproducibility, and applicability for picomolar level detection of HM ions in real water sample matrixes. Theoretical calculations for the HM–amino acid interaction also support a significantly improved mediator role of the alanine modifier that is consistent with the experimental findings.
2021 International Bhurban Conference on Applied Sciences and Technologies (IBCAST)
in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized t... more in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized to maximize the electroactive β-phase. PVDF/clay, PVDF/clay/PZT (lead zirconate titanate) and PVDF/PZT composites series with PZT loading of (0–40 %) were fabricated using melt casting technique. PVDF/clay/PZT composites parameters were optimized as a function of micro sized PZT filler concentrations and montmorillonite clay incorporated in the PVDF matrix with different surface modifications. As the reported literature on PVDF/PZT composites for enhancement of β-phase is rare, thus a possible spectrum of PVDF/PZT formulations containing different weight percentages of PZT powder (0, 10, 20, 30 and 40 wt. %) were developed and studied. All the composites were made by melt mixing and casted into flexible and homogeneous thin films. Presence of electroactive β-phase was confirmed by different characterization techniques including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Thermogravimetric analysis (TGA) and Differential scanning calorimetry (DSC). The gradual but noteworthy increment in polar β-phase was observed by fixing the composition of PVDF and nanoclay but varying the concentration of PZT. Further, it was observed that the change of organic surface modifications in montmorillonite clay not only improved the dispersion of filler in PVDF matrix but also maximized the electroactive β-phase.
Development of an ultra-sensitive electrochemical platform for the simultaneous detection of two ... more Development of an ultra-sensitive electrochemical platform for the simultaneous detection of two high blood pressure drugs.
Substituents play a major role in influencing the reactivity and biological activity of aromatic ... more Substituents play a major role in influencing the reactivity and biological activity of aromatic compounds. Substituents affect the conductivity of molecular electronic and photoresponsive switches, light harvesting dye-sensitized solar cells and organic electroluminescent devices. A number of quantum mechanical methods corresponding to stabilization energy, charge of substituent active region, energy dispersive analysis, and molecular electrostatic potential help in the description of substituent effect in aromatic systems. In the present work we carried out computational studies for the estimation of chemical and structural properties of a chemical library of nine ortho substituted naphthoic acids. The chemical reactivity of the selected substituted naphthoic acids was assessed from a number of physicochemical properties such as total energy, HOMO-LUMO gap, chemical hardness, binding energy, ionization potential, electron affinity, electronegativity, electrochemical potential, glo...
in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized t... more in this study, hybrid nanocomposites of poly vinylidene fluoride (PVDF) matrix were synthesized to maximize the electroactive -phase. PVDF/clay, PVDF/clay/PZT (lead zirconate titanate) and PVDF/PZT composites series with PZT loading of (0-40 %) were fabricated using melt casting technique. PVDF/clay/PZT composites parameters were optimized as a function of micro sized PZT filler concentrations and montmorillonite clay incorporated in the PVDF matrix with different surface modifications. As the reported literature on PVDF/PZT composites for enhancement of -phase is rare, thus a possible spectrum of PVDF/PZT formulations containing different weight percentages of PZT powder (0, 10, 20, 30 and 40 wt. %) were developed and studied. All the composites were made by melt mixing and casted into flexible and homogeneous thin films. Presence of electroactive -phase was confirmed by different characterization techniques including X-ray diffraction (XRD), Fourier transform infrared spectrosc...
This study reports the synthesis, characterization, and mercuric ion detection ability of novel t... more This study reports the synthesis, characterization, and mercuric ion detection ability of novel tribenzamides having flexible and rigid moieties.
Herein, we present a greener approach to achieve an ultrasensitive, selective, and viable sensor ... more Herein, we present a greener approach to achieve an ultrasensitive, selective, and viable sensor engineered by amino acids as a recognition layer for simultaneous electrochemical sensing of toxic heavy metals (HMs). Electrochemical techniques like electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and square-wave anodic stripping voltammetry (SWASV) were applied to demonstrate sensing capabilities of the designed analytical tool. The comparative results of different amino acids demonstrate alanine’s superior performance with a well-resolved and enhanced current signal for target metal ions due to strong complexation of its functional moieties. The working conditions for alanine-modified GCE were optimized by investigating the effect of alanine concentration, different supporting electrolytes, pH values, accumulation potentials, and time. The limits of detection for Zn2+, Cd2+, Cu2+, and Hg2+ were found to be 8.92, 5.77, 3.01, and 5.89 pM, respectively. The alanine-modified electrode revealed absolute discrimination ability, stability, and ultrasensitivity toward metal ions even in the presence of multifold interfering species. Likewise, greener modifier-designed electrodes possessed remarkable electrocatalytic activity, cost affordability, reproducibility, and applicability for picomolar level detection of HM ions in real water sample matrixes. Theoretical calculations for the HM–amino acid interaction also support a significantly improved mediator role of the alanine modifier that is consistent with the experimental findings.
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