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Alsaiari M, Afzal S, Sultan A, Shukrullah S, Saleem M, Yasin Naz M, Rizk MA, Irfan M. Dielectric Barrier Discharge Plasma Processing and Sr-Doped ZnO/CNT Photocatalyst Decoration of Cotton Fabrics for Self-Cleaning Application. ACS OMEGA 2024; 9:1977-1989. [PMID: 38222649 PMCID: PMC10785292 DOI: 10.1021/acsomega.3c09207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 12/02/2023] [Accepted: 12/08/2023] [Indexed: 01/16/2024]
Abstract
Nonthermal plasma processing is a chemical-free and environmentally friendly technique to enhance the self-cleaning activity of nanoparticle-coated cotton fabrics. In this research, Sr-doped ZnO/carbon nanotube (CNT) photocatalysts, namely, S10ZC2, S15ZC2, and S20ZC2 with different Sr doping concentrations, were synthesized using the sol-gel method and coated on plasma-functionalized fabric to perform the self-cleaning tests. The fabrics were treated with dielectric barrier discharge plasma in an open environment for 3 min to achieve a stable coating of nanoparticles. The energy band gap of the photocatalyst decreased with an increase in the level of Sr doping. The band gap of S10ZC2, S15ZC2, and S20ZC2 photocatalysts was estimated to be 2.85, 2.78, and 2.5 eV, respectively. The hexagonal wurtzite structure of ZnO was observed on the fabric surface composited with CNTs and Sr. The S20ZC2 photocatalyst showed better homogeneity and photocatalytic response on the fabric when compared with S10ZC2- and S15ZC2-coated fabrics. The S20ZC2 photocatalyst showed 89% dye degradation efficiency after 4 h of light exposure in methylene blue solution, followed by S15ZC2 (84%) and S10ZC2 (80%) photocatalysts.
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Affiliation(s)
- Mabkhoot Alsaiari
- Empty
Quarter Research Unit, Department of Chemistry, Faculty of Science
and Arts at Sharurah, Najran University, Sharurah 68342, Saudi Arabia
| | - Saba Afzal
- Department
of Physics, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
| | - Ameer Sultan
- Department
of Physics, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
| | - Shazia Shukrullah
- Department
of Physics, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
| | - Muhammad Saleem
- Department
of Physics, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
| | - Muhammad Yasin Naz
- Department
of Physics, University of Agriculture Faisalabad, Faisalabad 38040, Pakistan
| | - Moustafa A. Rizk
- Empty
Quarter Research Unit, Department of Chemistry, Faculty of Science
and Arts at Sharurah, Najran University, Sharurah 68342, Saudi Arabia
| | - Muhammad Irfan
- Electrical
Engineering Department, College of Engineering, Najran University Saudi Arabia, Najran 61441, Saudi Arabia
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Tan YY, Wong LS, Nyam KL, Wittayanarakul K, Zawawi NA, Rajendran K, Djearamane S, Dhanapal ACTA. Development and Evaluation of Topical Zinc Oxide Nanogels Formulation Using Dendrobium anosmum and Its Effect on Acne Vulgaris. Molecules 2023; 28:6749. [PMID: 37836592 PMCID: PMC10574386 DOI: 10.3390/molecules28196749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/16/2023] [Accepted: 08/31/2023] [Indexed: 10/15/2023] Open
Abstract
Zinc oxide nanoparticles have high levels of biocompatibility, a low impact on environmental contamination, and suitable to be used as an ingredient for environmentally friendly skincare products. In this study, biogenically synthesized zinc oxide nanoparticles using Dendrobium anosum are used as a reducing and capping agent for topical anti-acne nanogels, and the antimicrobial effect of the nanogel is assessed on Cutibacterium acne and Staphylococcus aureus. Dendrobium anosmum leaf extract was examined for the presence of secondary metabolites and its total amount of phenolic and flavonoid content was determined. Both the biogenically and chemogenic-synthesized zinc oxide nanoparticles were compared using UV-Visible spectrophotometer, FE-SEM, XRD, and FTIR. To produce the topical nanogel, the biogenic and chemogenic zinc oxide nanoparticles were mixed with a carbomer and hydroxypropyl-methyl cellulose (HPMC) polymer. The mixtures were then tested for physical and chemical characteristics. To assess their anti-acne effectiveness, the mixtures were tested against C. acne and S. aureus. The biogenic zinc oxide nanoparticles have particle sizes of 20 nm and a high-phase purity. In comparison to chemogenic nanoparticles, the hydrogels with biogenically synthesized nanoparticles was more effective against Gram-positive bacteria. Through this study, the hybrid nanogels was proven to be effective against the microbes that cause acne and to be potentially used as a green product against skin infections.
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Affiliation(s)
- Yu Yang Tan
- Department of Chemical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Kampar 31900, Malaysia;
| | - Ling Shing Wong
- Life Science Division, Faculty of Health and Life Sciences, INTI International University, Nilai 71899, Malaysia
| | - Kar Lin Nyam
- Department of Food Science and Nutrition, Faculty of Applied Sciences, UCSI University, Kuala Lumpur 56000, Malaysia;
| | - Kitiyaporn Wittayanarakul
- Program in Science Technology and Business Enterprise, Faculty of Interdisciplinary Studies, Khon Kaen University, Nong Khai Campus, Nong Khai 43000, Thailand;
| | - Nurliyana Ahmad Zawawi
- Department of Bioscience, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru 81310, Malaysia;
| | - Kavitha Rajendran
- Department of Pharmaceutics, SRM Institute of Science and Technology, SRM College of Pharmacy, Kattankulathur 603203, Tamil Nadu, India;
| | - Sinovassane Djearamane
- Department of Biomedical Science, Faculty of Science, Universiti Tunku Abdul Rahman, Kampar 31900, Malaysia;
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Irfan M, Afzal S, Hussain M, Naz MY, Shukrullah S, Rahman S, Faraj Mursal SN, Ghanim AAJ. Testing of Sr-Doped ZnO/CNT Photocatalysts for Hydrogen Evolution from Water Splitting under Atmospheric Dielectric Barrier Plasma Exposure. ACS OMEGA 2023; 8:18891-18900. [PMID: 37273618 PMCID: PMC10233682 DOI: 10.1021/acsomega.3c01262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 04/28/2023] [Indexed: 06/06/2023]
Abstract
Nonthermal plasma is a well-recognized environmentally advantageous method for producing green fuels. This work used different photocatalysts, including PZO, SxZO, and SxZCx for hydrogen production using an atmospheric argon coaxial dielectric barrier discharge (DBD)-based light source. The photocatalysts were produced using a sol-gel route. The DBD discharge column was filled with water, methanol, and the catalyst to run the reaction under argon plasma. The DBD reactor was operated with a 10 kV AC source to sustain plasma for water splitting. The light absorption study of the tested catalysts revealed a decrease in the band gap with an increase in the concentration of Sr and carbon nanotubes (CNTs) in the Sr/ZnO/CNTs series. The photocatalyst S25ZC2 demonstrated the lowest photoluminescence (PL) intensity, implying the most quenched recombination of charge carriers. The highest H2 evolution rate of 2760 μmol h-1 g-1 was possible with the S25ZC2 catalyst, and the lowest evolution rate of 56 μmol h-1 g-1 was observed with the PZO catalyst. The photocatalytic activity of S25ZC2 was initially high, which decreased slightly over time due to the deactivation of the photocatalyst. The photocatalytic activity decreased from 2760 to 1670 μmol h-1 g-1 at the end of the process.
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Affiliation(s)
- Muhammad Irfan
- Electrical
Engineering Department, College of Engineering, Najran University, Najran 61441, Saudi Arabia
| | - Saba Afzal
- Department
of Physics, University of Agriculture, Faisalabad 38040, Pakistan
| | - Muzammil Hussain
- Department
of Physics, University of Agriculture, Faisalabad 38040, Pakistan
| | - Muhammad Yasin Naz
- Department
of Physics, University of Agriculture, Faisalabad 38040, Pakistan
| | - Shazia Shukrullah
- Department
of Physics, University of Agriculture, Faisalabad 38040, Pakistan
| | - Saifur Rahman
- Electrical
Engineering Department, College of Engineering, Najran University, Najran 61441, Saudi Arabia
| | - Salim Nasar Faraj Mursal
- Electrical
Engineering Department, College of Engineering, Najran University, Najran 61441, Saudi Arabia
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Development of 3D ZnO-CNT Support Structures Impregnated with Inorganic Salts. MEMBRANES 2022; 12:membranes12060588. [PMID: 35736295 PMCID: PMC9229228 DOI: 10.3390/membranes12060588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 05/27/2022] [Accepted: 05/29/2022] [Indexed: 12/10/2022]
Abstract
Carbon-based materials are promising candidates for enhancing thermal properties of phase change materials (PCMs) without lowering its energy storage capacity. Nowadays, researchers are trying to find a proper porous structure as PCMs support for thermal energy storage applications. In this context, the main novelty of this paper consists in using a ZnO-CNT-based nanocomposite powder, prepared by an own hydrothermal method at high pressure, to obtain porous 3D printed support structures with embedding capacity of PCMs. The morphology of 3D structures, before and after impregnation with three PCMs inorganic salts (NaNO3, KNO3 and NaNO3:KNO3 mixture (1:1 vol% saturated solution) was investigated by scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDX). For structure impregnated with nitrates mixture, SEM cross-section morphology suggest that the inorganic salts impregnation started into micropores, continuing with the covering of the 3D structure surface and epitaxial growing of micro/nanostructured crystals, which led to reducing the distance between the structural strands. The variation of melting/crystallization points and associated enthalpies of impregnated PCMs and their stability during five repeated thermal cycles were studied by differential scanning calorimetry (DSC) and simultaneous DSC-thermogravimetry (DSC-TGA). From the second heating-cooling cycle, the 3D structures impregnated with NaNO3 and NaNO3-KNO3 mixture are thermally stable.
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Statistical Simulation of the Switching Mechanism in ZnO-Based RRAM Devices. MATERIALS 2022; 15:ma15031205. [PMID: 35161148 PMCID: PMC8840720 DOI: 10.3390/ma15031205] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Revised: 01/06/2022] [Accepted: 01/17/2022] [Indexed: 02/01/2023]
Abstract
Resistive random access memory (RRAM) has two distinct processes, the SET and RESET processes, that control the formation and dissolution of conductive filament, respectively. The laws of thermodynamics state that these processes correspond to the lowest possible level of free energy. In an RRAM device, a high operating voltage causes device degradation, such as bends, cracks, or bubble-like patterns. In this work, we developed a statistical simulation of the switching mechanism in a ZnO-based RRAM. The model used field-driven ion migration and temperature effects to design a ZnO-based RRAM dynamic SET and RESET resistance transition process. We observed that heat transport within the conducting filament generated a great deal of heat energy due to the carrier transport of the constituent dielectric material. The model was implemented using the built-in COMSOL Multiphysics software to address heat transfer, electrostatic, and yield RRAM energy. The heat energy increased with the increase in the operating power. Hence, the reliability of a device with high power consumption cannot be assured. We obtained various carrier heat analyses in 2D images and concluded that developing RRAM devices with low operating currents through material and structure optimization is crucial.
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