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Safia Khan
Department of Chemistry, Quaid-i-Azam University Islamabad, Islamabad 45320, Pakistan

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Journal article
Published: 06 August 2021 in Coatings
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Cost-effective, clean, highly transparent, and flexible as well as a coatable packaging material is envisioned to solve or at least mitigate quality preservation issues of organic materials, originating from moisture interaction under ambient conditions. Liquid phase processing of packaging coatings using nano-clay and polyvinyl alcohol (PVOH) has been developed and reported. Detailed analysis of the developed coating revealed moisture permeability of 2.8 × 10−2 g·cm/m2·day at 40 °C and 85% relative humidity (RH), which is in close accordance with Bharadwaj’s theoretical permeability model. Moreover, the developed coatings are not only more than 90% transparent, when exposed to white light, but also exhibit excellent flexibility and even after going through 10,000 bending cycles maintained the same blocking effect against moisture.

ACS Style

Ali Chandio; Iftikhar Channa; Muhammad Rizwan; Shakeel Akram; Muhammad Javed; Sajid Siyal; Muhammad Saleem; Muhammad Makhdoom; Tayyaba Ashfaq; Safia Khan; Shahid Hussain; Munirah Albaqami; Reham Alotabi. Polyvinyl Alcohol and Nano-Clay Based Solution Processed Packaging Coatings. Coatings 2021, 11, 942 .

AMA Style

Ali Chandio, Iftikhar Channa, Muhammad Rizwan, Shakeel Akram, Muhammad Javed, Sajid Siyal, Muhammad Saleem, Muhammad Makhdoom, Tayyaba Ashfaq, Safia Khan, Shahid Hussain, Munirah Albaqami, Reham Alotabi. Polyvinyl Alcohol and Nano-Clay Based Solution Processed Packaging Coatings. Coatings. 2021; 11 (8):942.

Chicago/Turabian Style

Ali Chandio; Iftikhar Channa; Muhammad Rizwan; Shakeel Akram; Muhammad Javed; Sajid Siyal; Muhammad Saleem; Muhammad Makhdoom; Tayyaba Ashfaq; Safia Khan; Shahid Hussain; Munirah Albaqami; Reham Alotabi. 2021. "Polyvinyl Alcohol and Nano-Clay Based Solution Processed Packaging Coatings." Coatings 11, no. 8: 942.

Journal article
Published: 05 July 2021 in Coatings
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Iron–copper bimetallic nanoparticles (Fe-Cu BNPs) were prepared via a green synthesis route. Ixora finlaysoniana has been used in this study as a capping and stabilizing agent in the modification of Fe-Cu BNPs. As-synthesized BNPs were characterized using different techniques including UV/Vis spectrophotometry, FTIR, XRD and SEM. A particle size analyzer and SEM studies indicated the particle size to be in the range of 50–200 nm. In addition, degradation of MB dye in an aqueous system and radical-scavenging potential in a DPPH assay were also examined using BNPs. Methylene blue dye degradation in 17 min was monitored with UV/Vis spectrophotometry, which exhibited the efficiency of Fe-Cu BNPs. Bimetallic nanoparticles were also found to be efficient in neutralizing DPPH free radicals. Furthermore, kinetic studies of both dye degradation and radical scavenging potential are reported in this article. Subsequently, Fe-Cu BNPs synthesized via a green and sustainable method can be employed for dye degradation and free radical-scavenging activities.

ACS Style

Umer Younas; Syed Hassan; Faisal Ali; Faiza Hassan; Zohaib Saeed; Muhammad Pervaiz; Safia Khan; Fakiha Jannat; Sidra Bibi; Ayesha Sadiqa; Zahid Ali; Shahid Iqbal; Ayman Ghfar; Mohamed Ouladsmane; Murefah Al-Anazy; Shafaqat Ali. Radical Scavenging and Catalytic Activity of Fe-Cu Bimetallic Nanoparticles Synthesized from Ixora finlaysoniana Extract. Coatings 2021, 11, 813 .

AMA Style

Umer Younas, Syed Hassan, Faisal Ali, Faiza Hassan, Zohaib Saeed, Muhammad Pervaiz, Safia Khan, Fakiha Jannat, Sidra Bibi, Ayesha Sadiqa, Zahid Ali, Shahid Iqbal, Ayman Ghfar, Mohamed Ouladsmane, Murefah Al-Anazy, Shafaqat Ali. Radical Scavenging and Catalytic Activity of Fe-Cu Bimetallic Nanoparticles Synthesized from Ixora finlaysoniana Extract. Coatings. 2021; 11 (7):813.

Chicago/Turabian Style

Umer Younas; Syed Hassan; Faisal Ali; Faiza Hassan; Zohaib Saeed; Muhammad Pervaiz; Safia Khan; Fakiha Jannat; Sidra Bibi; Ayesha Sadiqa; Zahid Ali; Shahid Iqbal; Ayman Ghfar; Mohamed Ouladsmane; Murefah Al-Anazy; Shafaqat Ali. 2021. "Radical Scavenging and Catalytic Activity of Fe-Cu Bimetallic Nanoparticles Synthesized from Ixora finlaysoniana Extract." Coatings 11, no. 7: 813.

Journal article
Published: 30 April 2021 in Coatings
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This work intended to enhance the unique and outstanding properties of lanthanum by synthesizing its nanocomposite. A lanthanum-based nanocomposite was prepared by a simple and cost-effective “co-precipitation” method. Lanthanum nitrate (La (NO3)3) and zinc nitrate (Zn (NO3)2) were used as precursors. The lanthanum/zinc oxide nano composite formed was then calcined at 450 °C for 4 h in order to obtain a fine powder with size in the nano range of 1–100 nm. Characterization of the prepared catalyst was done by ultraviolet/visible spectroscopy, Fourier transform infrared spectroscopy, and photoluminescence. Crystallinity and morphology were found by X-ray diffraction and scanning electron microscopy. The synthesized nanocomposite material was also tested for heterogeneous catalytic applications of 4-nitrophenol (4-NP) reduction into 4-aminophenol (4-AP). It was found to be successful in complete reduction of 4-NP with enhanced catalytic performance.

ACS Style

Ikram Ahmad; Muhammad Jamal; Miara Iftikhar; Awais Ahmad; Shahid Hussain; Humaira Asghar; Muhammad Saeed; Ammar Yousaf; Rama Karri; Nada Al-Kadhi; Mohamed Ouladsmane; Ayman Ghfar; Safia Khan. Lanthanum-Zinc Binary Oxide Nanocomposite with Promising Heterogeneous Catalysis Performance for the Active Conversion of 4-Nitrophenol into 4-Aminophenol. Coatings 2021, 11, 537 .

AMA Style

Ikram Ahmad, Muhammad Jamal, Miara Iftikhar, Awais Ahmad, Shahid Hussain, Humaira Asghar, Muhammad Saeed, Ammar Yousaf, Rama Karri, Nada Al-Kadhi, Mohamed Ouladsmane, Ayman Ghfar, Safia Khan. Lanthanum-Zinc Binary Oxide Nanocomposite with Promising Heterogeneous Catalysis Performance for the Active Conversion of 4-Nitrophenol into 4-Aminophenol. Coatings. 2021; 11 (5):537.

Chicago/Turabian Style

Ikram Ahmad; Muhammad Jamal; Miara Iftikhar; Awais Ahmad; Shahid Hussain; Humaira Asghar; Muhammad Saeed; Ammar Yousaf; Rama Karri; Nada Al-Kadhi; Mohamed Ouladsmane; Ayman Ghfar; Safia Khan. 2021. "Lanthanum-Zinc Binary Oxide Nanocomposite with Promising Heterogeneous Catalysis Performance for the Active Conversion of 4-Nitrophenol into 4-Aminophenol." Coatings 11, no. 5: 537.

Journal article
Published: 09 March 2021 in Coatings
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Ammonia electro-oxidation (AEO) is a zero carbon-emitting sustainable means for the generation of hydrogen fuel, but its commercialization is deterred due to sluggish reaction kinetics and the poisoning of expensive metal electrocatalysts. With this perspective, CuO impregnated γ-Al2O3 (CuO/γ-Al2O3) hybrid materials were synthesized as effective and affordable electrocatalysts and investigated for AEO in alkaline media. Structural investigations were performed via different characterization techniques, i.e., X-ray diffraction (XRD), Fourier transformed infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electrochemical impedance spectroscopy (EIS). The morphology of γ-Al2O3 support as interconnected porous structures rendered the CuO/γ-Al2O3 nanocatalysts with robust activity. The additional CuO impregnation resulted in the enhanced electrochemical active surface area (ECSAs) and diffusion coefficient and spiked the electrocatalytic performance for NH3 electrolysis. Owing to good values of diffusion coefficient for AEO, low bandgap, and availability of ample ECSA at higher CuO to γ-Al2O3 ratio, these proposed electrocatalysts were proved to be effective in AEO. Due to good reproducibility, electrochemical stability, and higher activity for ammonia electro-oxidation, CuO/γ-Al2O3 nanomaterials are proposed as efficient promoters, electrode materials, or catalysts in ammonia electrocatalysis.

ACS Style

Safia Khan; Syed Shah; Mohsin Anjum; Mohammad Khan; Naveed Janjua. Electro-Oxidation of Ammonia over Copper Oxide Impregnated γ-Al2O3 Nanocatalysts. Coatings 2021, 11, 313 .

AMA Style

Safia Khan, Syed Shah, Mohsin Anjum, Mohammad Khan, Naveed Janjua. Electro-Oxidation of Ammonia over Copper Oxide Impregnated γ-Al2O3 Nanocatalysts. Coatings. 2021; 11 (3):313.

Chicago/Turabian Style

Safia Khan; Syed Shah; Mohsin Anjum; Mohammad Khan; Naveed Janjua. 2021. "Electro-Oxidation of Ammonia over Copper Oxide Impregnated γ-Al2O3 Nanocatalysts." Coatings 11, no. 3: 313.

Journal article
Published: 22 February 2021 in Coatings
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An Ag2O(x)−PrO2(y)/γ-Al2O3 electrocatalyst series (X:Y is for Ag:Pr from 0 to 10) was synthesized, to use synthesized samples in electrochemical applications, a step in fuel cells advancements. Ag2O(x)−PrO2(y)/γ-Al2O3/Glassy-Carbon was investigated for electrochemical oxidation of ammonia in alkaline medium and proved to be highly effective, having high potential utility, as compared to commonly used Pt-based electrocatalysts. In this study, gamma alumina as catalytic support was synthesized via precipitation method, and stoichiometric wt/wt.% compositions of Ag2O−PrO2 were loaded on γ-Al2O3 by co-impregnation method. The desired phase of γ-Al2O3 and supported nanocatalysts was obtained after heat treatment at 800 and 600 °C, respectively. The successful loadings of Ag2O−PrO2 nanocatalysts on surface of γ-Al2O3 was determined by X-rays diffraction (XRD), Fourier-transform Infrared Spectroscopy (FTIR), and energy dispersive analysis (EDX). The nano-sized domain of the sample powders sustained with particle sizes was calculated via XRD and scanning electron microscopy (SEM). The surface morphology and elemental compositions were examined by SEM, transmission electron microscopy (TEM) and EDX. The conductive and electron-transferring nature was investigated by cyclic voltammetry and electrochemical impedance (EIS). Cyclic voltammetric profiles were observed, and respective kinetic and thermodynamic parameters were calculated, which showed that these synthesized materials are potential catalysts for ammonia electro-oxidation. Ag2O(6)−PrO2(4)/γ-Al2O3 proved to be the most proficient catalyst among all the members of the series, having greater diffusion coefficient, heterogeneous rate constant and lesser Gibbs free energy for this system. The catalytic activity of these electrocatalysts is revealed from electrochemical studies which reflected their potentiality as electrode material in direct ammonia fuel cell technology for energy production.

ACS Style

Mariam Khan; Naveed Janjua; Safia Khan; Ibrahim Qazi; Shafaqat Ali; Tahani Saad Algarni. Electro-Oxidation of Ammonia at Novel Ag2O−PrO2/γ-Al2O3 Catalysts. Coatings 2021, 11, 257 .

AMA Style

Mariam Khan, Naveed Janjua, Safia Khan, Ibrahim Qazi, Shafaqat Ali, Tahani Saad Algarni. Electro-Oxidation of Ammonia at Novel Ag2O−PrO2/γ-Al2O3 Catalysts. Coatings. 2021; 11 (2):257.

Chicago/Turabian Style

Mariam Khan; Naveed Janjua; Safia Khan; Ibrahim Qazi; Shafaqat Ali; Tahani Saad Algarni. 2021. "Electro-Oxidation of Ammonia at Novel Ag2O−PrO2/γ-Al2O3 Catalysts." Coatings 11, no. 2: 257.

Journal article
Published: 28 January 2021 in Arabian Journal of Chemistry
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Improvement in chitosan (CS) was achieved by solution casting using cellulose nanowhiskers (CNWs) and multiwall carbon nanotubes (MWCNTs) to synthesize CS/CNW functionalized/treated MWCNTs (CS/CNWs/f-MWCNTs) and CS/CNW untreated MWCNTs (CS/CNWs/Un-MWCNTs) nanocomposite films. A comparison between effects of f-MWCNTs and Un-MWCNTs on CS/CNWs matrix have been studied with respect to change in their physical and mechanical properties. The surface morphology, chemical composition, mechanical properties and temperature decomposition of CS/CNWs/f-MWCNTs and CS/CNW/Un-MWCNTs nanocomposite films were characterized by Energy Dispersion Spectroscopy (EDS), Field Emission Scanning Electron Microscope (FESEM), Fourier-Transform Infrared Spectroscopy (FTIR) and Thermogravimetric Analysis (TGA). FESEM has shown that f-MWCNTs and Un-MWCNTs were well dispersed in CS/CNWs structure. Decrease in film ductility was observed with addition of Un-MWCNTs or f-MWCNTs. Moreover, Tensile strength (TS) and Young’s modulus (YM) were increased with f-MWCNTs and seemed to be decreased in case of Un-MWCNTs. However, a decrease in elongation at break (EB) has experienced with addition of f-MWCNTs and Un-MWCNTs. Furthermore, thermal stability of chitosan composites presented a delay or prevention from degradation of CS/CNWs due to the strong interactions. Such modification in chitosan can improve its mechanical and surface properties. Hence, chitosan derived composites could achieve more applicability in packaging, medicinal and environmental applications.

ACS Style

Chin Zhen Thou; Fahad Saleem Ahmed Khan; N.M. Mubarak; Awais Ahmad; Mohammad Khalid; Priyanka Jagadish; Rashmi Walvekar; E.C. Abdullah; Safia Khan; Mariam Khan; Shahid Hussain; Ikram Ahmad; Tahani Saad Algarni. Surface charge on chitosan/cellulose nanowhiskers composite via functionalized and untreated carbon nanotube. Arabian Journal of Chemistry 2021, 14, 103022 .

AMA Style

Chin Zhen Thou, Fahad Saleem Ahmed Khan, N.M. Mubarak, Awais Ahmad, Mohammad Khalid, Priyanka Jagadish, Rashmi Walvekar, E.C. Abdullah, Safia Khan, Mariam Khan, Shahid Hussain, Ikram Ahmad, Tahani Saad Algarni. Surface charge on chitosan/cellulose nanowhiskers composite via functionalized and untreated carbon nanotube. Arabian Journal of Chemistry. 2021; 14 (3):103022.

Chicago/Turabian Style

Chin Zhen Thou; Fahad Saleem Ahmed Khan; N.M. Mubarak; Awais Ahmad; Mohammad Khalid; Priyanka Jagadish; Rashmi Walvekar; E.C. Abdullah; Safia Khan; Mariam Khan; Shahid Hussain; Ikram Ahmad; Tahani Saad Algarni. 2021. "Surface charge on chitosan/cellulose nanowhiskers composite via functionalized and untreated carbon nanotube." Arabian Journal of Chemistry 14, no. 3: 103022.