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Gupta N, Gupta SM, Sharma SK. Synthesis of in situ Generated Cu−CNT Hybrid Nanofluid and the Study of Their Thermo‐physical Properties. ChemistrySelect 2023. [DOI: 10.1002/slct.202203102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Nikita Gupta
- USBAS Guru Gobind Singh Indraprastha University New Delhi 110078 India
| | | | - S. K. Sharma
- USCT Guru Gobind Singh Indraprastha University New Delhi 110078 India
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2
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Badran I, Al‐Ejli MO. Efficient Multi‐walled Carbon Nanotubes/Iron Oxide Nanocomposite for the Removal of the Drug Ketoprofen for Wastewater Treatment Applications. ChemistrySelect 2022. [DOI: 10.1002/slct.202202976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ismail Badran
- Department of Chemistry Faculty of Sciences An-Najah National University Nablus Palestine, P.O.Box: 7
| | - Maan Omar Al‐Ejli
- Department of Chemistry and Earth Sciences College of Arts and Sciences Qatar University P.O. Box 2713 Doha Qatar College of Arts and Sciences, Qatar University
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3
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Green Synthesis and Pinning Behavior of Fe-Doped CuO/Cu2O/Cu4O3 Nanocomposites. Processes (Basel) 2022. [DOI: 10.3390/pr10040729] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Egg white-induced auto combustion has been used to synthesize undoped and Fe-doped CuO/Cu2O/Cu4O3 nanocomposites in a soft, secure, and one-pot procedure. X-ray powder diffraction (XRD) and Fourier transform infrared (FTIR) investigations have been used to identify functional groups and the structural properties of crystalline phases present in the as-synthesized composites. Scanning Electron Microscopy/Energy Dispersive Spectrometry (SEM/EDS) elemental mapping analyses and Transmission Electron Microscopy (TEM) techniques were used to explore the morphological and compositional properties of these composites. N2- adsorption/desorption isotherm models have been used to examine the surface variables of the as-prepared systems. Based on the Vibrating Sample Magnetometer (VSM) technique, the magnetic properties of various copper-based nanocomposites were detected due to being Fe-doped. XRD results showed that the undoped system was composed of CuO as a major phase with Cu2O and Cu4O3 as second phases that gradually disappeared by increasing the dopant content. The crystalline phase’s crystallographic properties were determined. The average particle size was reduced when the synthesized systems were doped with Fe. The construction of porous and polycrystalline nanocomposites involving Cu, Fe, O, and C components was confirmed by SEM/EDS and TEM measurements. In terms of the increase in magnetization of the as-manufactured nanocomposites due to Fe-doping, oxygen vacancies at the surface/or interfacial of nanoparticles, while also domain wall pinning mechanisms, were investigated. Finally, employing the investigated production process, Fe doping of CuO/Cu2O/Cu4O3 nanocomposite resulted in the development of a single phase (CuO) exhibiting “pinned” type magnetization. This is the first publication to show that CuO/Cu2O/Cu4O3.
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Investigation on hybrid nanofluids based on carbon nanotubes filled with metal nanoparticles: Stability, thermal conductivity, and viscosity. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2021.05.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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5
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Elsaid K, Olabi AG, Wilberforce T, Abdelkareem MA, Sayed ET. Environmental impacts of nanofluids: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 763:144202. [PMID: 33385840 DOI: 10.1016/j.scitotenv.2020.144202] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 11/22/2020] [Accepted: 11/25/2020] [Indexed: 06/12/2023]
Abstract
Nanofluids (NFs) have been expanding their applications in many areas as high-performance heat transfer fluid (HTF) for heating and cooling purposes. This is mainly due to the improved thermophysical properties relative to the base fluid (BF). The addition of nanoparticles (NPs) to BF, to obtain NFs, increases the thermal conductivity, hence better heat transfer properties and thermal performance. The properties of NFs can be considered somehow intermediate between those of the BF and the added solid NPs. The improved heat transfer using NFs results in increased energy conversion efficiency, which results in reduced energy consumption for heating or cooling applications. BF and their environmental impacts (EIs) have been widely discussed within the scope of their applications as a HTF, with most of the attention given to the improved energy efficiency. The IEs of NPs and their toxicity and other characteristics have been extensively studied due to the widespread applications on newly engineered NPs. However, with the evolution of expanding the applications of NFs, the different EIs were not well addressed. The discussion should consider both the base fluid and NPs added in combination as the NF constitutes. The current work presents a brief discussion on the EIs of NFs. The discussion presented in this work considers the NPs as the primary contributor to the EIs of different NFs. It was found that the EIs of NFs depend significantly on the type of NP used, followed by the BF, and finally, the loading of NPs in BF. The use of non-toxic and naturally occurring NPs at lower NPs loading in water as NF promises a much lower EIs in terms of toxicity energy requirements for production, and other EIs, while still maintaining high thermal performance. The production methods of both NPs, i.e., synthesis route, and NF, i.e., one-step or two-step, were found to have a significant effect on the associated EIs of the produced NF. The simpler NP synthesis route and NF production will result in much lower chemicals and energy requirements, which in turn reduce the EIs.
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Affiliation(s)
- Khaled Elsaid
- Chemical Engineering Program, Texas A&M University, College Station, TX 77843-3122, USA.
| | - A G Olabi
- Center for Advanced Materials Research, University of Sharjah, 27272 Sharjah, United Arab Emirates; Department of Sustainable and Renewable Energy Engineering, University of Sharjah, 27272 Sharjah, United Arab Emirates.
| | - Tabbi Wilberforce
- Mechanical Engineering and Design, Aston University, School of Engineering and Applied Science, Aston Triangle, Birmingham B4 7ET, UK
| | - Mohammad Ali Abdelkareem
- Center for Advanced Materials Research, University of Sharjah, 27272 Sharjah, United Arab Emirates; Department of Sustainable and Renewable Energy Engineering, University of Sharjah, 27272 Sharjah, United Arab Emirates; Chemical Engineering Department, Faculty of Engineering, Minia University, Egypt
| | - Enas Taha Sayed
- Center for Advanced Materials Research, University of Sharjah, 27272 Sharjah, United Arab Emirates; Chemical Engineering Department, Faculty of Engineering, Minia University, Egypt
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6
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Jin C, Wu Q, Zhang H, Yang G, Yuan X, Fu H. Study on preparation, stability, thermal conductivity, and viscosity of silver nanoparticles-decorated three-dimensional graphene-like porous carbon hybrid nanofluids. NANOTECHNOLOGY 2021; 32:245712. [PMID: 33691293 DOI: 10.1088/1361-6528/abed77] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 03/10/2021] [Indexed: 06/12/2023]
Abstract
In the present study, a novel silver nanoparticles-decorated three-dimensional graphene-like porous carbon (Ag/3D GPC) nanocomposite has been synthesized via the method of carbonization and reduction of silver ions at the same time. This Ag/3D GPC nanocomposite possess an interconnected network of well crystalized and submicron-sized macropores with thin graphene walls of several nanometers, where silver nanoparticles distributing uniformly. The water based and ethylene glycol based Ag/3D GPC hybrid nanofluids have been prepared without any surfactant. The hybrid nanofluids with low concentration (<0.8 wt%) can be steadily dispersed for more than six months. The thermal conductivity enhancement for the nanofluids with 0.1 wt% can reach 10.3% and 8.8% at 25 °C compared with pure water and ethylene glycol, respectively. The viscosity of nanofluids is investigated, the temperature dependence of the dynamic viscosity obeys an Arrhenius-like behavior. The prepared Ag/3D GPC hybrid nanofluids with good stability and thermal conductivity are promisingly considered to be used in heat transfer field.
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Affiliation(s)
- Can Jin
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
| | - Qibai Wu
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou 510006, People's Republic of China
| | - Haiyan Zhang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
- Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter, Guangzhou 510006, People's Republic of China
| | - Guoqiang Yang
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
| | - Xingxing Yuan
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
| | - Huiqing Fu
- School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, People's Republic of China
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7
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Badran I, Qut O, Manasrah AD, Abualhasan M. Continuous adsorptive removal of glimepiride using multi-walled carbon nanotubes in fixed-bed column. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:14694-14706. [PMID: 33219502 DOI: 10.1007/s11356-020-11679-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 11/15/2020] [Indexed: 06/11/2023]
Abstract
Water pollution by emerging pollutants such as pharmaceutical and personal care products is one of today's biggest challenges. The presence of these emerging contaminants in water has raised increasing concern due to their frequent appearance and persistence in the aquatic ecosystem and threat to health and safety. The antidiabetic drug glimepiride, GPD, is among these compounds, and it possesses adverse effects on human health if not carefully administered. Several conventional processes were proposed for the elimination of these persistent contaminants, and adsorption is among them. Therefore, in this study, the adsorptive removal of GPD from water using multi-walled carbon nanotubes (MWCNT) supported on silica was explored on a fixed-bed column. The effects of bed-height, solution pH, and flow rate on the adsorptive removal of GPD were investigated. The obtained adsorption parameters using Sips, Langmuir, and Freundlich models were used to investigate the continuous adsorption. The results showed that the drug removal is improved with the increasing bed height; however, it decreased with the flow rate. The effect of pH indicated that the adsorption is significantly affected and increased in acidic medium. The convection-dispersion model coupled with Freundlich isotherm was developed and used to describe the adsorption breakthrough curves. The maximum adsorption capacity (qm) was 275.3 mg/g, and the axial dispersion coefficients were ranged between 3.5 and 9.0 × 105 m2/s. The spent adsorbent was successfully regenerated at high pH by flushing with NaOH.
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Affiliation(s)
- Ismail Badran
- Department of Chemistry and Earth Sciences, Qatar University, P.O. Box: 2713, Doha, Qatar.
| | - Obada Qut
- Department of Chemistry, An-Najah National University, P.O. Box 7, Nablus, Palestine
| | - Abdallah D Manasrah
- Department of Chemical and Petroleum Engineering, University of Calgary, 2500 University Street NW, Calgary, Alberta, T2N 1N4, Canada
- Carbon OxyTech Inc., 3655 36 Street NW, Calgary, Alberta, T2L 1Y8, Canada
| | - Murad Abualhasan
- Department of Pharmacy, An-Najah National University, P.O. Box 7, Nablus, Palestine
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8
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Ba TL, Bohus M, Lukács IE, Wongwises S, Gróf G, Hernadi K, Szilágyi IM. Comparative Study of Carbon Nanosphere and Carbon Nanopowder on Viscosity and Thermal Conductivity of Nanofluids. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:608. [PMID: 33671055 PMCID: PMC8000812 DOI: 10.3390/nano11030608] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Revised: 02/11/2021] [Accepted: 02/23/2021] [Indexed: 11/16/2022]
Abstract
A comparative research on stability, viscosity (µ), and thermal conductivity (k) of carbon nanosphere (CNS) and carbon nanopowder (CNP) nanofluids was performed. CNS was synthesized by the hydrothermal method, while CNP was provided by the manufacturer. Stable nanofluids at high concentrations 0.5, 1.0, and 1.5 vol% were prepared successfully. The properties of CNS and CNP nanoparticles were analyzed with Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), specific surface area (SBET), X-ray powder diffraction (XRD), thermogravimetry/differential thermal analysis (TG/DTA), and energy dispersive X-ray analysis (EDX). The CNP nanofluids have the highest k enhancement of 10.61% for 1.5 vol% concentration compared to the base fluid, while the CNS does not make the thermal conductivity of nanofluids (knf) significantly higher. The studied nanofluids were Newtonian. The relative µ of CNS and CNP nanofluids was 1.04 and 1.07 at 0.5 vol% concentration and 30 °C. These results can be explained by the different sizes and crystallinity of the used nanoparticles.
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Affiliation(s)
- Thong Le Ba
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Muegyetem Rakpart 3., 1111 Budapest, Hungary; (M.B.); (I.M.S.)
| | - Marcell Bohus
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Muegyetem Rakpart 3., 1111 Budapest, Hungary; (M.B.); (I.M.S.)
| | - István Endre Lukács
- Centre for Energy Research, Institute for Technical Physics and Materials Science, Hungarian Academy of Sciences, Konkoly Thege M. út 29-33, 1121 Budapest, Hungary;
| | - Somchai Wongwises
- Department of Mechanical Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangmod, Bangkok 10140, Thailand;
- National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
| | - Gyula Gróf
- Centre for Energy Research, Konkoly-Thege Miklós út 29-33, 1121 Budapest, Hungary;
| | - Klara Hernadi
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Béla tér 1, 6720 Szeged, Hungary;
- Institute of Physical Metallurgy, Metal Forming and Nanotechnology, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary
| | - Imre Miklós Szilágyi
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Muegyetem Rakpart 3., 1111 Budapest, Hungary; (M.B.); (I.M.S.)
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Han JH, Shin KH, Lee YJ. Scalable Binder-Free Freestanding Electrodes Based on a Cellulose Acetate-Assisted Carbon Nanotube Fibrous Network for Practical Flexible Li-Ion Batteries. ACS APPLIED MATERIALS & INTERFACES 2021; 13:6375-6384. [PMID: 33508939 DOI: 10.1021/acsami.0c22664] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Herein, a freestanding cellulose acetate-carbon nanotube (CA-CNT) film electrode is presented to achieve highly flexible, high-energy lithium-ion batteries (LIBs). CA serves as a dispersing agent of CNTs and a binder-free network former. A straightforward washing can remove CA in the electrode almost completely, while the fibrous CNT network within the electrode is sustained. Furthermore, the facile fabrication enables the large-scale production of the film electrode because the CA-CNT film is processed by a conventional casting method and not by the area-limited vacuum filtration. The superior electrochemical performance and high flexibility of the full cell assembled with CA-CNT-based electrodes are maintained even at a high active material loading, which has been proven difficult to accomplish in the conventional configuration LIBs. In addition, by simply stacking six sheets of the freestanding film electrode, a capacity as high as 5.4 mA h cm-2 is achieved. The assembled pouch battery operates stably under extreme deformation. We demonstrate that the rational design of the electrode could extend the flexibility to a higher energy than that achieved with the conventional configuration. We believe that the low production cost, high flexibility, and superior electrochemical performance of the proposed freestanding film electrode can expedite the implementation of wearable gears in daily life.
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Affiliation(s)
- Ji Hyun Han
- Department of Energy Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Kyu Hang Shin
- Department of Energy Engineering, Hanyang University, Seoul 04763, Republic of Korea
| | - Yun Jung Lee
- Department of Energy Engineering, Hanyang University, Seoul 04763, Republic of Korea
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Almanassra IW, Okonkwo EC, Alhassan O, Atieh MA, Kochkodan V, Al-Ansari T. Stability and thermophysical properties test of carbide-derived carbon thermal fluid; a comparison between functionalized and emulsified suspensions. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2020.09.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Sapkota KP, Hassan MM, Shrestha S, Hanif MA, Islam MA, Akter J, Abbas HG, Hahn JR. Heterojunction formation between copper(II) oxide nanoparticles and single-walled carbon nanotubes to enhance antibacterial performance. Int J Pharm 2020; 590:119937. [PMID: 33011252 DOI: 10.1016/j.ijpharm.2020.119937] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 09/23/2020] [Accepted: 09/27/2020] [Indexed: 12/19/2022]
Abstract
We delineate the excellent bactericidal efficacy of stable heterojunction nanocomposites composed of single-walled carbon nanotubes (SWCNTs) and copper(II) oxide (CuO) synthesized via facile recrystallization and calcination. The bactericidal effectiveness of the fabricated nanocomposites was examined using the standard broth-dilution method and the growth-inhibition-zone analysis method, in which bacteria cultured in an incubator in tryptic soy broth medium were subjected to the prepared samples. The bactericidal activity of all of the as-synthesized samples is evident in both methods, displaying a substantial decrease in bacterial colonies and resulting in clear inhibition zones, respectively. Among the CuO-SWCNT nanocomposites, the sample subjected to calcination at 500 °C for 5 h was found to exhibit the best performance against Staphylococcus aureus and Escherichia coli, forming inhibition zones 182% and 162% larger than those formed by pure CuO, respectively.
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Affiliation(s)
- Kamal Prasad Sapkota
- Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, South Korea; Department of Chemistry, Amrit Campus, Tribhuvan University, Kathmandu 44618, Nepal
| | - Md Mehedi Hassan
- Department of Biomedical Sciences and Institute for Medical Science, Jeonbuk National University, Jeonju 54907, South Korea
| | - Sita Shrestha
- Department of Bionanosystem Engineering, Graduate School, Jeonbuk National University, Jeonju 54896, South Korea
| | - Md Abu Hanif
- Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, South Korea
| | - Md Akherul Islam
- Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, South Korea
| | - Jeasmin Akter
- Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, South Korea
| | - Hafiz Ghulam Abbas
- Department of Nanoscience and Nanotechnology, Jeonbuk National University, Jeonju 54896, South Korea
| | - Jae Ryang Hahn
- Department of Chemistry, Research Institute of Physics and Chemistry, Jeonbuk National University, Jeonju 54896, South Korea; Department of Nanoscience and Nanotechnology, Jeonbuk National University, Jeonju 54896, South Korea; Textile Engineering, Chemistry and Science, North Carolina State University, 2401 Research Dr., Raleigh, NC 27695-8301, USA
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12
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Environmentally benign production of cupric oxide nanoparticles and various utilizations of their polymeric hybrids in different technologies. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213378] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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An experimental study on stability and thermal conductivity of water/CNTs nanofluids using different surfactants: A comparison study. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2019.111025] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Enhanced Visible-Light Photocatalysis of Nanocomposites of Copper Oxide and Single-Walled Carbon Nanotubes for the Degradation of Methylene Blue. Catalysts 2020. [DOI: 10.3390/catal10030297] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
We report enhanced catalytic action of a series of copper(II)-oxide-single-walled carbon nanotube (CuO-SWCNT) composite photocatalysts (abbreviated as CuO-SWCNT-0.5, CuO-SWCNT-2, and CuO-SWCNT-5, where 0.5, 2, and 5 represent the calcination time in hours) synthesized via recrystallization followed by calcination. The photocatalytic performance of the fabricated nanocomposites was examined by evaluating the degradation of methylene blue (MB) under irradiation with visible light. All of the as-fabricated nanocomposites were effective photocatalysts for the photodegradation of a MB solution; however, the CuO-SWCNT-5 displayed the best photocatalytic ability among the investigated catalysts, achieving 97.33% degradation of MB in 2 h under visible-light irradiation. The photocatalytic action of the nanocomposites was remarkably higher than that of pristine CuO nanocrystals fabricated using the same route. The recyclability of the photocatalyst was also investigated; the CuO-SWCNT-5 catalyst could be reused for three cycles without substantial degradation of its catalytic performance or morphology.
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Siddiqui H, Qureshi MS, Haque FZ. Biosynthesis of Flower-Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities. NANO-MICRO LETTERS 2020; 12:29. [PMID: 34138069 PMCID: PMC7770900 DOI: 10.1007/s40820-019-0357-y] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Accepted: 12/05/2019] [Indexed: 05/03/2023]
Abstract
Copper oxide nanoflowers (CuO-NFs) have been synthesized through a novel green route using Tulsi leaves-extracted eugenol (4-allyl-2-methoxyphenol) as reducing agent. Characterizations results reveal the growth of crystalline single-phase CuO-NFs with monoclinic structure. The prepared CuO-NFs can effectively degrade methylene blue with 90% efficiency. They also show strong barrier against E. coli (27 ± 2 mm) at the concentration of 100 µg mL-1, while at the concentration of 25 µg mL-1 weak barrier has been found against all examined bacterial organisms. The results provide important evidence that CuO-NFs have sustainable performance in methylene blue degradation as well as bacterial organisms.
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Affiliation(s)
- Hafsa Siddiqui
- Department of Physics, Sha-Shib College of Science and Management, Bhopal, 462030, India.
| | - M S Qureshi
- Optical Nanomaterial Lab, Department of Physics, Maulana Azad National Institute of Technology, Bhopal, 462003, India
| | - Fozia Zia Haque
- Optical Nanomaterial Lab, Department of Physics, Maulana Azad National Institute of Technology, Bhopal, 462003, India
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A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids. Catalysts 2019. [DOI: 10.3390/catal10010034] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Copper oxide (CuO) and cerium oxide (CeO2) of various concentrations have been prepared through an ultrasonically assisted dispersion of CuO and CeO2 nanoparticles (NPs) in which water and nanofluids (NFs) were formulated. The morphological properties of the CuO and CeO2 NPs are reported. Few of the physicochemical properties that can influence the photocatalytic activities of the NFs are evaluated, such as viscosity, activation energy, density, thermal conductivity, electrical conductivity, alternating current (AC) conductivity, pH, stability, refractive index and optical band gap of the CuO and CeO2 NFs. Viscosity studies have been made at four different temperatures (303 K, 308 K, 313 K and 318 K) and the activation energy is calculated and compared between the CuO and CeO2 NFs. The thermal conductivity of the two NFs is calculated and compared. Electrical conductivity is measured for CuO and CeO2 NFs using an impedance analyzer at different frequencies at 303 K. The dielectric constant and AC conductivity were studied. The electrical conductivity and pH of the prepared NFs are measured and the results are compared. The stability of the NFs is determined from Zeta potential values obtained from dynamic light scattering measurements. UV-Visible diffuse reflectance measurements were used to deduce the optical bandgap of the respective metal oxide NPs in the NFs. The photocatalytic efficiencies of the CuO NFs and CeO2 NFs were evaluated using methylene blue (MB) as the model dye. The rate constant for the photodegradation of MB was higher for CuO NF as compared CeO2 NF and also higher than simple NPs-based photocatalysts. A plausible explanation for the role of NFs over the simple NPs-based photocatalytic solution is presented.
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Hameed A, Mukhtar A, Shafiq U, Qizilbash M, Khan MS, Rashid T, Bavoh CB, Rehman WU, Guardo A. Experimental investigation on synthesis, characterization, stability, thermo-physical properties and rheological behavior of MWCNTs-kapok seed oil based nanofluid. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.01.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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18
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Rathod V, Tripathi R, Joshi P, Jha PK, Bahadur P, Tiwari S. Paclitaxel Encapsulation into Dual-Functionalized Multi-Walled Carbon Nanotubes. AAPS PharmSciTech 2019; 20:51. [PMID: 30617845 DOI: 10.1208/s12249-018-1218-6] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 10/08/2018] [Indexed: 01/31/2023] Open
Abstract
This work reports the synthesis of multi-walled carbon nanotubes (CNTs) from xylene/ferrocene using catalytic chemical vapor deposition technique. Following characterization using transmission electron microscopy (TEM), energy-dispersive X-ray (EDX), and Raman spectroscopy, CNT surface was dual-functionalized using ethylenediamine and phenylboronic acid groups. Average diameter of CNTs was calculated to be 16.5 nm. EDX spectra confirmed the existence of carbonaceous deposits on the tube's surface. Scattered electron diffraction and X-ray peak broadening calculations showed consistent inter-planer distance of the grown CNTs. Chemical functionalization, confirmed from FT-IR and Raman spectra, showed an enhanced dispersibility of CNTs in water. We describe the changes in the first- and second-order regions of the Raman spectra following the encapsulation of an anti-cancer drug, paclitaxel (PLX), into the free volume of functionalized CNTs. High PLX loading, achieved through its non-covalent π-π stacking within the CNT interior, is confirmed through the blue-shifted, softened G band in the Raman spectrum. While not addressed here, we will exploit this dual functionalization tactic to elaborate the relative role of attached moieties in the affinity interaction of CNTs with extra-cellular sialic acid, a biological target showing metastatic stage-dependent over-expression in colon cancer cells.
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Baca M, Cendrowski K, Kukulka W, Bazarko G, Moszyński D, Michalkiewicz B, Kalenczuk RJ, Zielinska B. A Comparison of Hydrogen Storage in Pt, Pd and Pt/Pd Alloys Loaded Disordered Mesoporous Hollow Carbon Spheres. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E639. [PMID: 30134612 PMCID: PMC6163314 DOI: 10.3390/nano8090639] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 08/13/2018] [Accepted: 08/16/2018] [Indexed: 11/26/2022]
Abstract
Comprehensive study to evaluate the ability of hydrogen uptake by disordered mesoporous hollow carbon spheres doped witch metal such as Pt, Pd or Pt/Pd was conducted. They were synthesized facilely using sonication and then calcination process under vacuum at the temperature of 550 °C. The effect on hydrogen sorption at neat-ambient conditions (40 °C, up to 45 bar) was thoroughly analyzed. The results clearly revealed that metal functionalization has a significant impact on the hydrogen storage capacity as the mechanism of gas uptake depends on two factors: metal type and certain size of particles. Thus, functionalized spheres adsorb hydrogen by physisorption forming metal hydrides or metal hydrides combined with hydrogen spillover effect. As a result, a sample with narrower distribution of nanoparticles and smaller specific size exhibited enhanced hydrogen uptake.
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Affiliation(s)
- Martyna Baca
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin Al. Piastow 45, 70-311 Szczecin, Poland.
| | - Krzysztof Cendrowski
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin Al. Piastow 45, 70-311 Szczecin, Poland.
| | - Wojciech Kukulka
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin Al. Piastow 45, 70-311 Szczecin, Poland.
| | - Grzegorz Bazarko
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin Al. Piastow 45, 70-311 Szczecin, Poland.
| | - Dariusz Moszyński
- Institute of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland.
| | - Beata Michalkiewicz
- Institute of Inorganic Chemical Technology and Environment Engineering, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, Pułaskiego 10, 70-322 Szczecin, Poland.
| | - Ryszard J Kalenczuk
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin Al. Piastow 45, 70-311 Szczecin, Poland.
| | - Beata Zielinska
- Nanomaterials Physicochemistry Department, Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin Al. Piastow 45, 70-311 Szczecin, Poland.
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