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Roy O, Bashar MS, Tofail SAM, Haq EU, Gulshan F. Tuning Anatase to Rutile Ratio in Nanocrystalline Titania Enriched from Sustainable Beach‐Sand from Cox’s Bazar, Bangladesh. SURF INTERFACE ANAL 2023. [DOI: 10.1002/sia.7201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Oishy Roy
- Dept. of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology Dhaka 1000 Bangladesh
| | - M. S. Bashar
- Bangladesh Council of Scientific and Industrial Research Dhaka 1205 Bangladesh
| | - Syed A. M. Tofail
- Department of Physics and Bernal Institute University of Limerick Ireland
| | - Ehtsham Ul Haq
- Department of Physics and Bernal Institute University of Limerick Ireland
| | - Fahmida Gulshan
- Dept. of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology Dhaka 1000 Bangladesh
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Mahjabin S, Haque MM, Sobayel K, Selvanathan V, Jamal MS, Bashar MS, Sultana M, Hossain MI, Shahiduzzaman M, Algethami M, Alharthi SS, Amin N, Sopian K, Akhtaruzzaman M. Investigation of Morphological, Optical, and Dielectric Properties of RF Sputtered WO x Thin Films for Optoelectronic Applications. Nanomaterials (Basel) 2022; 12:3467. [PMID: 36234594 PMCID: PMC9565653 DOI: 10.3390/nano12193467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/16/2022] [Accepted: 09/26/2022] [Indexed: 06/16/2023]
Abstract
Tungsten oxide (WOx) thin films were synthesized through the RF magnetron sputtering method by varying the sputtering power from 30 W to 80 W. Different investigations have been conducted to evaluate the variation in different morphological, optical, and dielectric properties with the sputtering power and prove the possibility of using WOx in optoelectronic applications. An Energy Dispersive X-ray (EDX), stylus profilometer, and atomic force microscope (AFM) have been used to investigate the dependency of morphological properties on sputtering power. Transmittance, absorbance, and reflectance of the films, investigated by Ultraviolet-Visible (UV-Vis) spectroscopy, have allowed for further determination of some necessary parameters, such as absorption coefficient, penetration depth, optical band energy gap, refractive index, extinction coefficient, dielectric parameters, a few types of loss parameters, etc. Variations in these parameters with the incident light spectrum have been closely analyzed. Some important parameters such as transmittance (above 80%), optical band energy gap (~3.7 eV), and refractive index (~2) ensure that as-grown WOx films can be used in some optoelectronic applications, mainly in photovoltaic research. Furthermore, strong dependencies of all evaluated parameters on the sputtering power were found, which are to be of great use for developing the films with the required properties.
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Affiliation(s)
- Samiya Mahjabin
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (The National University of Malaysia), Bangi 43600, Malaysia
| | - Md. Mahfuzul Haque
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (The National University of Malaysia), Bangi 43600, Malaysia
| | - K. Sobayel
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (The National University of Malaysia), Bangi 43600, Malaysia
| | - Vidhya Selvanathan
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (The National University of Malaysia), Bangi 43600, Malaysia
| | - M. S. Jamal
- Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
| | - M. S. Bashar
- Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
| | - Munira Sultana
- Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
| | - Mohammad Ismail Hossain
- Department of Electrical and Computer Engineering, University of California, Davis, CA 95616, USA
| | - Md. Shahiduzzaman
- Nanomaterials Research Institute (NanoMaRi), Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
| | - Merfat Algethami
- Department of Physics, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Sami S. Alharthi
- Department of Physics, Faculty of Science, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia
| | - Nowshad Amin
- Institute of Sustainable Energy, Universiti Tenaga Nasional (The National Energy University), Jalan IKRAM-UNITEN, Kajang 43000, Malaysia
| | - Kamaruzzaman Sopian
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (The National University of Malaysia), Bangi 43600, Malaysia
| | - Md. Akhtaruzzaman
- Solar Energy Research Institute (SERI), Universiti Kebangsaan Malaysia (The National University of Malaysia), Bangi 43600, Malaysia
- Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba 305-8573, Ibaraki, Japan
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Jahan N, Khan MNI, Hasan MR, Bashar MS, Islam A, Alam MK, Hakim MA, Khandaker JI. Correlation among the structural, electric and magnetic properties of Al 3+ substituted Ni-Zn-Co ferrites. RSC Adv 2022; 12:15167-15179. [PMID: 35693236 PMCID: PMC9116189 DOI: 10.1039/d1ra09354a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Accepted: 05/11/2022] [Indexed: 11/21/2022] Open
Abstract
This study explored the structural, electrical, and magnetic properties of diamagnetic aluminium (Al3+) substituted nickel-zinc-cobalt (Ni–Zn–Co) mixed spinel ferrites, though the research on this area is in the infancy stage. Single-phase cubic spinel structures with the Fd3̄m space group of the synthesized Ni0.4Zn0.35Co0.25Fe(2−x)AlxO4 (0 ≤ x ≤ 0.12) ferrite samples were confirmed by X-ray diffraction (XRD) analysis. The average particle size ranged from 0.67 to 0.39 μm. Selected area electron diffraction (SAED) patterns were indexed according to the space group Fd3m, representing the particle's crystallinity. The optical band gaps ranged from 4.784 eV to 4.766 eV. Frequency-dependent dielectric constants and ac conductivity measurement suggested that the prepared ferrites were highly resistive. Relaxation times were reduced to a low value from 45.45 μs to 1.54 μs with the composition x. The Curie temperatures (Tc) were 615–623 K for all samples. Real part permeabilities (μ/) were relatively stable up to an extended frequency range of 106 Hz with relative quality factors (RQF) of around 103. Tuning of the properties indicates that the fabricated ferrites may be promising for high-frequency electronic devices. This study explored the structural, electrical, and magnetic properties of diamagnetic aluminium (Al3+) substituted nickel–zinc–cobalt (Ni–Zn–Co) mixed spinel ferrites, though the research on this area is in the infancy stage.![]()
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Affiliation(s)
- Nusrat Jahan
- Department of Physics, Jahangirnagar University Savar Dhaka 1342 Bangladesh .,Department of Physics, American International University Bangladesh (AIUB) Dhaka 1229 Bangladesh
| | - M N I Khan
- Materials Science Division, Atomic Energy Centre Dhaka 1000 Bangladesh
| | - M R Hasan
- Materials Science Division, Atomic Energy Centre Dhaka 1000 Bangladesh
| | - M S Bashar
- Sustainable Energy Technology, Institute of Fuel Research & Development, BCSIR, Ministry of Science & Technology Bangladesh
| | - A Islam
- Department of Physics, Magura Govt. Mahila College Magura Bangladesh
| | - M K Alam
- Department of Physics, Materials Science Lab, Bangladesh University of Engineering & Technology Dhaka 1000 Bangladesh
| | - M A Hakim
- Department of Glass and Ceramic Engineering, Bangladesh University of Engineering and Technology (BUET) Dhaka 1000 Bangladesh
| | - J I Khandaker
- Department of Physics, Jahangirnagar University Savar Dhaka 1342 Bangladesh
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Uddin T, Siddiquee N, Khandaker MN, Bashar MS, Rahim HR, Islam S, Rahman MA, Amatya B. Efficacy and Safety of the Awake Prone Positioning in Patients with COVID-19 Related Respiratory Distress: A Scoping Review. Mymensingh Med J 2022; 31:272-279. [PMID: 34999715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Prone positioning (PP) is becoming an important treatment modality for the management of COVID-19 related respiratory distress syndrome. The aim of this scoping review was to evaluate effectiveness and safety of awake PP in non-intubated patients with COVID-19 related acute respiratory distress at different care settings. The study was conducted during December 1, 2019 to August 30, 2020 using health science electronic databases and grey literature. A PRISMA flow diagram was used and finally 06 studies with 187 patients were included for review. Male patients were predominating with the mean age of approximately 55 years. Oxygenation was improved in 79.14% patients. One hundred fifty seven (83.95%) patients with COVID-19-related hypoxemic respiratory distress tolerated the procedure. Intubations required 25.41% of the patients or mechanical ventilation and 6(3.2%) patients expired. Number of patients in the reported studies could tolerate more than 3 hours of PP without a major side effect. Awake proning improved oxygenation of the patients suffering from COVID-19 related respiratory hypoxia in different care settings. Early instituted prone positioning may be an effective alternative method of treating COVID-19 related respiratory distress. Patient compliance and small size cohort studies are the limitations of this review. Multicenter controlled studies are warranted before conclusions are made about safety and the settings.
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Affiliation(s)
- T Uddin
- Professor Dr Taslim Uddin, Chairman, Department of Physical Medicine and Rehabilitation, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka-1000, Bangladesh; E-mail:
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Zumahi SMAA, Arobi N, Taha H, Hossain MK, Kabir H, Matin R, Bashar MS, Ahmed F, Hossain MA, Rahman MM. Extraction, optical properties, and aging studies of natural pigments of various flower plants. Heliyon 2020; 6:e05104. [PMID: 33024874 PMCID: PMC7527660 DOI: 10.1016/j.heliyon.2020.e05104] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 08/15/2020] [Accepted: 09/25/2020] [Indexed: 01/12/2023] Open
Abstract
In this paper, we reported the extraction process of five different flowering plants utilizing different dye extraction methods and solvents (ethanol and water) to choose the best dye removal process. The FTIR spectra revealed the presence of several clear functional groups for all five natural dyes. The analytical studies such as UV spectroscopy, column chromatography, and vacuum evaporation were performed to isolate the dyes from their solutions. The UV-Vis studies on the pigments of flower extracts indicated broad absorption peaks in the visible region including clear bandgaps. Among the studied pigments, Alternanthera ficoidea showed the lowest direct bandgap of 1.69 eV and an Urbach energy value of 6.33 meV. The dye extraction yield rate improvement was extended from 11.7 to 24.7% (water solvent) and 11.3-32.4% (ethanol solvent). Throughout the studies, it was observed that ethanol produced a better extraction for organic dyes than water as a solvent. Aging studies revealed that all the dyes at the room temperature showed better stability with minor changes in the observed optical parameters in oxygen-rich conditions; however, these parameters have shown significant variations at a 60 °C temperature.
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Affiliation(s)
- S M Amir-Al Zumahi
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
- Bangladesh Atomic Energy Commission, Dhaka 1207, Bangladesh
| | - Nourin Arobi
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
- Bangladesh Atomic Energy Commission, Dhaka 1207, Bangladesh
| | - Hatem Taha
- Department of Physics, College of Education for Pure Science, Ibn Al-Haitham, University of Baghdad, 10071, Baghdad, Iraq
| | - Md Kamal Hossain
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
| | - Humayun Kabir
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
- School of Engineering, RMIT University, Bundoora, Victoria 3083, Australia
| | - Rummana Matin
- Institute of Fuel Research and Development (IFRD), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
| | - M S Bashar
- Institute of Fuel Research and Development (IFRD), Bangladesh Council of Scientific and Industrial Research (BCSIR), Dhaka 1205, Bangladesh
| | - Farid Ahmed
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
| | - Md Abul Hossain
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
| | - M Mahbubur Rahman
- Department of Physics, Jahangirnagar University, Savar, Dhaka 1342, Bangladesh
- Discipline of Chemistry and Physics, College of Science, Health, Engineering and Education, Murdoch University, Perth, WA 6150, Australia
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