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Gal S, Cabaleiro D, Hassen W, Nasri A, Lafue Y, Pham-Huu C, Ba H, Estellé P. Thermophysical Profile of Industrial Graphene Water-Based Nanofluids. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:1401. [PMID: 39269064 PMCID: PMC11397638 DOI: 10.3390/nano14171401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2024] [Revised: 08/21/2024] [Accepted: 08/26/2024] [Indexed: 09/15/2024]
Abstract
The exceptional properties of high-grade graphene make it an ideal candidate for thermal dissipation and heat exchange in energy applications and nanofluid development. Here, we present a comprehensive study of few-layer graphene (FLG) nanofluids prepared in an industrial context. FLG nanofluids were synthesized through an ultrasound-assisted mechanical exfoliation process of graphite in water with a green solvent. This method produces FLG of high structural quality and stable nanofluids, as demonstrated by electron microscope, dynamic light scattering and ζeta potential analyses. Thermal conductivity measurements of FLG-based nanofluids were conducted in the temperature range of 283.15 K to 313.15 K, with FLG concentrations ranging from 0.005 to 0.200% in wt. The thermal conductivity of FLG nanofluids is up to 20% higher than water. The modeling of nanofluid thermal conductivity reveals that this enhancement is supported by the influence of the thermal resistance at the FLG interface, and the content, average dimensions and flatness of FLG sheets; this latter varying with the FLG concentration in the nanofluid. Additionally, the density and heat capacity of FLG suspensions were measured and compared with theoretical models, and the rheological behavior of FLG nanofluids was evaluated. This behavior is mainly Newtonian, with a weak 5% viscosity increase.
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Affiliation(s)
- Soulayma Gal
- LGCGM, University Rennes, 35000 Rennes, France
- LMES, Université de Monastir, Monastir 5000, Tunisia
| | | | - Walid Hassen
- LMES, Université de Monastir, Monastir 5000, Tunisia
| | | | | | - Cuong Pham-Huu
- ICPPEES, Université de Strasbourg et Centre National de Recherche Scientifique, 67000 Strasbourg, France
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Liu M, Qin H, Chen Y, Lu Y, Song Y, Gao Z, Xiong C, Liu F. Recent Progress of Functional Solvent-free Nanofluids: A Review. ACS APPLIED MATERIALS & INTERFACES 2024; 16:41766-41787. [PMID: 39101359 DOI: 10.1021/acsami.4c08256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/06/2024]
Abstract
Nanoparticles have aroused widespread interest because of their unique surface structure and nano effect, which presents novel characteristics like as sound, light, electricity, magnetism, and thermal properties. However, two critical defects have hindered their applications: (1) poor processability resulting from the high melting temperature (e.g., >1000 °C) for some inorganic nanoparticles; (2) the restriction of the nano effect caused by the easy aggregation of the nanoparticles. To solve those issues, solvent-free nanofluids (SNFs) with hard cores and flexible organic chains were successfully designed and fabricated at the beginning of the twenty-first century. The promising technology of SNFs not only solved the dispersion problem of nanomaterials but also imparted novel functionalization to nanoparticles. Up to now, many researchers have been devoted to developing diverse cores and flexible organic polymer chains to endow SNFs with particular functions, such as conductivity, fluorescence, lubricity, and so on. However, there are few review reports on the research progress in the fabrication and applications of functional SNFs. To gain a better understanding of SNFs, this paper presents an overall investigation into the development, fabrication, as well as the applications of functional SNFs.
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Affiliation(s)
- Man Liu
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Hongmei Qin
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Yu Chen
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Yao Lu
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Yiheng Song
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Zhaodongfang Gao
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Chuanxi Xiong
- State Key Laboratory of Silicate Materials for Architectures, Hubei Engineering Research Center for Green & Precision Material Forming, and School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Feihua Liu
- Sauvage Laboratory for Smart Materials, The School of Integrated Circuits, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
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Liu M, Zhao H, Zhu C, Wen G. Solar Heat Flux Suppression on Optical Antenna of Geosynchronous Earth Orbit Satellite-Borne Lasercom Sensor. SENSORS (BASEL, SWITZERLAND) 2024; 24:5005. [PMID: 39124053 PMCID: PMC11314942 DOI: 10.3390/s24155005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2024] [Revised: 07/21/2024] [Accepted: 07/23/2024] [Indexed: 08/12/2024]
Abstract
The objective of this article is to examine potential techniques for suppressing solar heat flow on the optical antenna of a laser communication sensor. Firstly, the characteristics of the geosynchronous Earth orbit's (GEO) space radiation environment are analysed, and a combined passive and active thermal control solution is proposed. Secondly, the temperature distribution of the lasercom sensor under extreme operating conditions is simulated utilising IDEAS-TMG (6.8 NX Series) software, which employs Monte Carlo and radiative heat transfer numerical calculation methods. Finally, a strategy for avoiding direct sunlight around midnight is proposed. The simulation results demonstrated that the thermal control solution and solar avoidance strategy proposed in this paper achieved long-term fine-stable control of the temperature field of the optical antenna, which met the thermal permissible communication hours per daily orbit cycle in excess of 14 h per day.
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Affiliation(s)
- Ming Liu
- School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China;
- Changchun Observatory, National Astronomical Observatories, CAS, Changchun 130117, China; (C.Z.); (G.W.)
| | - Hongwei Zhao
- School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China;
| | - Chengwei Zhu
- Changchun Observatory, National Astronomical Observatories, CAS, Changchun 130117, China; (C.Z.); (G.W.)
| | - Guanyu Wen
- Changchun Observatory, National Astronomical Observatories, CAS, Changchun 130117, China; (C.Z.); (G.W.)
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Bijapur K, Mandal S, Siddheshwar PG, Bose S, Hegde G. Experimental investigation of a biomass-derived nanofluid with enhanced thermal conductivity as a green, sustainable heat-transfer medium and qualitative comparison via mathematical modelling. NANOSCALE ADVANCES 2024:d4na00362d. [PMID: 39144160 PMCID: PMC11320364 DOI: 10.1039/d4na00362d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Accepted: 07/26/2024] [Indexed: 08/16/2024]
Abstract
In this study, bio-based carbon nanospheres (CNSs) were synthesized from lignocellulosic-rich groundnut skin (Arachis hypogaea) and tested for their practical application in nanofluids (NFs) for enhanced heat transfer. The CNSs were characterized using various techniques, including FESEM, EDS, XRD, Raman spectroscopy, zeta potential analysis, and FTIR. Thermal conductivity (TC) and viscosity measurements were conducted using transient plane source (TPS) technique with a Hot Disk thermal analyser and discovery hybrid rheometer, respectively. The nanoparticles (NPs) were dispersed in two base fluids: ethylene glycol (EG) and a 60 : 40 mixture of deionized water (DI) and EG. Optimization studies were performed by varying the stirring and measurement times to improve TC values. The results showed that when a power source of 40 mW was applied at a high concentration of nanoparticles (i.e., 0.1 wt%), there was a 91.9% increment in thermal conductivity (TC) compared to the base fluid EG. DI-EG-based nanofluids (NFs) exhibited enhancements of up to 45% compared to the base fluid DI-EG (60 : 40), with a heating power of 80 mW and concentration of 0.1 wt%. These results demonstrated significant TC improvements with NP incorporation. Further experiments were performed by varying the temperature in the range of 30-80 °C with readings taken for every 10 °C increase, which showed a direct relation with the TC values. At 80 °C, EG-based NFs showed increments of 77%, 111.49%, 139.67% and 175% at 0.01, 0.02, 0.05 and 0.1 wt% concentrations of NPs, respectively. It was also found that with the increase in the concentration of NPs, viscosity increased, whereas an increase in the temperature led to a decrease in viscosity. The CNS nanofluid exhibited a Newtonian behaviour with the nanoparticle concentration and temperature, resulting in an approximately 114% enhancement compared to the base fluid when the concentration of CNSs was 0.1 wt% at 30 °C but decreased by up to 18% when the temperature was increased to 90 °C. Using appropriate mathematical models for assessing thermophysical quantities, it was discovered that the model values and experimental values correspond reasonably well. Our method thus validates our experimental results and deepens the understanding of the mechanisms behind enhancing thermal conductivity in biomass-derived nanofluids. In summary, our work advances sustainable nanomaterial synthesis, providing a new solution for boosting thermal conductivity while maintaining environmental integrity, thereby inspiring further research and innovation in this field.
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Affiliation(s)
- Kiran Bijapur
- Department of Chemistry, Christ University Hosur Road Bengaluru 560029 India
- Centre for Advanced Research and Development (CARD), Christ University Hosur Road Bengaluru 560029 India
| | - Samir Mandal
- Department of Materials Engineering, Indian Institute of Science Bengaluru 560012 India
| | - P G Siddheshwar
- Centre for Mathematical Needs, Department of Mathematics, Christ University Hosur Road Bengaluru 560029 India
| | - Suryasarathi Bose
- Department of Materials Engineering, Indian Institute of Science Bengaluru 560012 India
| | - Gurumurthy Hegde
- Department of Chemistry, Christ University Hosur Road Bengaluru 560029 India
- Centre for Advanced Research and Development (CARD), Christ University Hosur Road Bengaluru 560029 India
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Zhu Y, Chen H, Zhang J, Xiao G, Yi M, Chen Z, Xu C. Effect of interface layer on the enhancement of thermal conductivity of SiC-Water nanofluids: Molecular dynamics simulation. J Mol Graph Model 2024; 127:108696. [PMID: 38147710 DOI: 10.1016/j.jmgm.2023.108696] [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: 11/08/2023] [Revised: 12/02/2023] [Accepted: 12/13/2023] [Indexed: 12/28/2023]
Abstract
To investigate the impact of interfacial layer effects on the thermal conductivity of nanofluids and the microscopic mechanisms of enhanced thermal conductivity, this study employed non-equilibrium molecular dynamics to compute the thermal conductivity, number density, radial distribution function, and mean square displacement distribution of SiC nanofluids. The impact of nanoparticle volume fraction and particle size parameters on the thermal conductivity of nanofluids and the structure of interfacial adsorption layers was discussed. The simulation calculation results show that the coefficient of thermal conductivity of nanofluid is positively related to the volume fraction of nanoparticles, increasing from 0.6529 W/(m·K) to 0.8159 W/(m·K), and the enhancement of thermal conductivity by the volume fraction can be up to 33.97 %. The thermal conductivity is inversely correlated with the change in particle size, and the maximum improvement in thermal conductivity by particle size can reach up to 12.05 %. The simulated results of the thermal conductivity of nanofluid are almost consistent with the predicted results of the Yu&Choi model, and the error is controlled within 5 %. Simultaneously, the thickness of the interfacial adsorption layer decreases with an increase in particle size. This reduction arises due to larger particles having a smaller specific surface area, resulting in fewer particle surfaces covered by the interface layer. Moreover, the impact of particle size on the arrangement and affinity of molecules within the interface layer contributes to this decrease. Overall, interface layer effects exhibit a dual impact on the thermal conduction of nanofluids. The structured formation and high-density distribution of the adsorption layer contribute to enhanced heat transfer, while thermal resistance between nanoparticle surfaces and the fluid restricts heat transmission.
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Affiliation(s)
- Yandong Zhu
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Hui Chen
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Shandong Machinery Design & Research Institute, Jinan 250031, China
| | - Jingjie Zhang
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
| | - Guangchun Xiao
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Shandong Machinery Design & Research Institute, Jinan 250031, China
| | - Mingdong Yi
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Shandong Machinery Design & Research Institute, Jinan 250031, China
| | - Zhaoqiang Chen
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Shandong Machinery Design & Research Institute, Jinan 250031, China
| | - Chonghai Xu
- School of Mechanical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Key Laboratory of Equipment Manufacturing and Intelligent Measurement and Control, China National Light Industry, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China; Shandong Machinery Design & Research Institute, Jinan 250031, China.
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Pan X, Jin H, Ku X, Guo Y, Fan J. Coupling at the molecular scale between the graphene nanosheet and water and its effect on the thermal conductivity of the nanofluid. Phys Chem Chem Phys 2024; 26:2402-2413. [PMID: 38168675 DOI: 10.1039/d3cp04896a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Graphene nanofluid is a promising way to improve heat transfer in many situations. As a two-dimensional material, graphene's anisotropic thermal conductivity influences the heat transfer of nanofluids. In the present study, a nonequilibrium molecular dynamics (MD) simulation is adopted to study the interaction between graphene nanosheets (GNSs) and liquid water in water-based graphene nanofluids. Consequently, the coupling interaction between the orientation and length of GNSs and the thermal conductivity of nanofluids is then investigated. We discover that the molecular thermal coupling between GNSs and water can effectively influence the orientation angle of the GNSs. A preferential orientation angle of the GNSs inside the nanofluid is then observed during heat transfer. The preferential orientation angle decreases with the GNS length and has no apparent relation with the size of heat flux in this study. The overall thermal conductivity of the nanofluid decreases as the orientation angle of the GNS rises. Increasing the GNS length not only reduces the preferential orientation angle but also improves the thermal conductivity along the graphene length direction. The thermal conductivity of the nanofluid along the graphene length direction increases from 0.414 to 4.085 W m K-1 as the length increases from 103 to 3274 A. Our results provide the fundamental knowledge of the heat transfer performance of graphene nanofluids.
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Affiliation(s)
- Xiong Pan
- School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China.
| | - Hanhui Jin
- School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China.
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Xiaoke Ku
- School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China.
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Yu Guo
- School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China.
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
| | - Jianren Fan
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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7
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Rheological Profile of Graphene-based Nanofluids in Thermal Oil with Hybrid Additives of Carbon Nanotubes and Nanofibers. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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8
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Dehnou KH, Norouzi GS, Majidipour M. A review: studying the effect of graphene nanoparticles on mechanical, physical and thermal properties of polylactic acid polymer. RSC Adv 2023; 13:3976-4006. [PMID: 36756574 PMCID: PMC9891084 DOI: 10.1039/d2ra07011a] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 01/11/2023] [Indexed: 01/28/2023] Open
Abstract
Polylactic acid (PLA) is a linear aliphatic polyester thermoplastic made from renewable sources such as sugar beet and cornstarch. Methods of preparation of polylactic acid are biological and chemical. The advantages of polylactic acid are biocompatibility, easily processing, low energy loss, transparency, high strength, resistance to water and fat penetration and low consumption of carbon dioxide during production. However, polylactic acid has disadvantages such as hydrophobicity, fragility at room temperature, low thermal resistance, slow degradation rate, permeability to gases, lack of active groups and chemical neutrality. To overcome the limitations of PLA, such as low thermal stability and inability to absorb gases, nanoparticles such as graphene are added to improve its properties. Extensive research has been done on the introduction of graphene nanoparticles in PLA, and all of these studies have been studied. In this study, we intend to study a comprehensive study of the effect of graphene nanoparticles on the mechanical, thermal, structural and rheological properties of PLA/Gr nanocomposites and also the effect of UV rays on the mechanical properties of PLA/Gr nanocomposites.
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Affiliation(s)
- Kianoush Hatami Dehnou
- Department of Materials Science and Engineering, School of Engineering, Shiraz University Shiraz Iran
| | - Ghazal Saki Norouzi
- Chemical Engineering Department, Faculty of Engineering, Razi University Iran
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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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10
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Jin W, Jiang L, Han L, Huang H, Zhang J, Guo M, Gu Y, Zhi F, Chen Z, Yang G. Investigation of thermal conductivity enhancement of water-based graphene and graphene/MXene nanofluids. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Albert AA, D. G. HS, V. P. Review of stability enhanced nanofluids prepared by one-step methods—heat transfer mechanism and thermo-physical properties. CHEM ENG COMMUN 2022. [DOI: 10.1080/00986445.2022.2147833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Annie Aureen Albert
- Department of Physics, Hindustan Institute of Technology and Science (Deemed to be University), Chennai, Tamil Nadu, India
| | - Harris Samuel D. G.
- Department of Mechanical Engineering, Hindustan Institute of Technology and Science (Deemed to be University), Chennai, Tamil Nadu, India
| | - Parthasarathy V.
- Department of Physics, Hindustan Institute of Technology and Science (Deemed to be University), Chennai, Tamil Nadu, India
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12
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Mohammadpour-Haratbar A, Zare Y, Rhee KY. Electrochemical biosensors based on polymer nanocomposites for detecting breast cancer: Recent progress and future prospects. Adv Colloid Interface Sci 2022; 309:102795. [DOI: 10.1016/j.cis.2022.102795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 10/03/2022] [Accepted: 10/03/2022] [Indexed: 12/13/2022]
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14
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Said Z, Sohail MA, Walvekar R, Liu C. Impact of sonication durations on thermophysical properties, contact angle and surface tension of f-MWCNTs nanofluid for heat transfer. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119164] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Investigation the effects of different nanoparticles on density and specific heat: Prediction using MLP artificial neural network and response surface methodology. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Lozano-Steinmetz F, Martínez VA, Vasco DA, Sepúlveda-Mualin A, Singh DP. The Effect of Ag-Decoration on rGO/Water Nanofluid Thermal Conductivity and Viscosity. NANOMATERIALS 2022; 12:nano12071095. [PMID: 35407211 PMCID: PMC9000799 DOI: 10.3390/nano12071095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Revised: 03/16/2022] [Accepted: 03/24/2022] [Indexed: 11/21/2022]
Abstract
Carbon-based nanomaterials have a high thermal conductivity, which can be exploited to prepare nanofluids. Graphene is a hydrophobic substance, and consequently, graphene-based nanofluid stability is improved by adding surfactants. An attractive alternative is the decoration of reduced graphene oxide (rGO) with metallic materials to improve the thermal conductivity without affecting the stability of nanofluids. This study focuses on the synthesis and characterization of rGO/Ag (0.1 wt.%) aqueous nanofluids. Moreover, the effects of the Ag concentration (0.01−1 M) on the thermal conductivity and viscosity during the synthesis of rGO/Ag composite are analyzed. The nanofluid thermal conductivity showed increases in relation to the base fluid, the most promising being 28.43 and 26.25% for 0.1 and 1 M of Ag, respectively. Furthermore, the nanofluids were Newtonian in the analyzed range of shear rates and presented a moderate increase (<11%) in viscosity. Aqueous nanofluids based on rGO/Ag nanocomposites are a potential alternative for applications as heat transfer fluids.
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Affiliation(s)
- Felipe Lozano-Steinmetz
- Department of Mechanical Engineering, Faculty of Engineering, University of Santiago of Chile (USACH), Av. Lib. Bdo. O’Higgins 3363, Estación Central, Santiago 9170022, Chile; (F.L.-S.); (V.A.M.)
| | - Victor A. Martínez
- Department of Mechanical Engineering, Faculty of Engineering, University of Santiago of Chile (USACH), Av. Lib. Bdo. O’Higgins 3363, Estación Central, Santiago 9170022, Chile; (F.L.-S.); (V.A.M.)
| | - Diego A. Vasco
- Department of Mechanical Engineering, Faculty of Engineering, University of Santiago of Chile (USACH), Av. Lib. Bdo. O’Higgins 3363, Estación Central, Santiago 9170022, Chile; (F.L.-S.); (V.A.M.)
- Correspondence:
| | - Alonso Sepúlveda-Mualin
- Millennium Institute for Research in Optics (MIRO), Physics Department, Faculty of Science, University of Santiago of Chile (USACH), Av. Víctor Jara 3493, Estación Central, Santiago 9170124, Chile; (A.S.-M.); (D.P.S.)
| | - Dinesh Patrap Singh
- Millennium Institute for Research in Optics (MIRO), Physics Department, Faculty of Science, University of Santiago of Chile (USACH), Av. Víctor Jara 3493, Estación Central, Santiago 9170124, Chile; (A.S.-M.); (D.P.S.)
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Cullari LL, Ligati Schleifer S, Kogan D, Ziskind G, Regev O. Down the Dimensionality Lane: Thermal Conductivity Enhancement in Carbon-Based Liquid Dispersions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:9844-9854. [PMID: 35138787 DOI: 10.1021/acsami.1c23256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Carbon allotropes of different dimensionality, i.e., 1D-carbon nanotubes, 2D-graphene nanoplatelets, and 3D-graphite, possess high thermal conductivity (TC > 2000 W/m K). They are, therefore, excellent candidates for filler material aiming at increasing the TC of composites used for thermal management. However, preparing aqueous dispersions of these materials is challenging due to their strong van der Waals attraction, leading to aggregation and subsequent precipitation. Reported dispersion methodologies have failed to disperse large microscale fillers, which are essential for efficient thermal management. In this work, we suggest to "kinetically arrest" the dispersion by using sepiolite, a fiberlike clay, that effectively disperses all three carbon dimensionalities. We explore the effect of filler dimensionality and properties (lateral size, thickness, defect density) on the dispersion TC enhancement. Modeling the TC by the effective medium approach allows lumping all the intrinsic properties of the filler into a single parameter termed "effective TC", providing an accurate prediction of the experimentally measured TC. We show that, by judicious choice of filler, the TC of both water and a water-ethylene glycol mixture can be enhanced by 31% using graphene nanoplatelets of 15 μm in lateral size. We believe that the guidelines obtained in this work provide a useful tool for designing future liquid composites with enhanced thermal properties.
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Affiliation(s)
- Lucas Luciano Cullari
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Shani Ligati Schleifer
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - David Kogan
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
| | - Gennady Ziskind
- Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva, 8410501, Israel
| | - Oren Regev
- Department of Chemical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
- The Ilse Katz Institute for Nanoscale Science and Technology, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel
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Almuzaiqer R, Ali ME, Al-Salem K. Effect of the Aspect Ratio and Tilt Angle on the Free Convection Heat Transfer Coefficient Inside Al 2O 3-Water-Filled Square Cuboid Enclosures. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:500. [PMID: 35159844 PMCID: PMC8839379 DOI: 10.3390/nano12030500] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/25/2022] [Accepted: 01/26/2022] [Indexed: 11/17/2022]
Abstract
This experimental study provides a comprehensive investigation of natural convection heat transfer inside shallow square cuboid enclosures filled with aluminum oxide-water nanofluid at four different volume concentrations: 0.0%, 0.2%, 0.4%, and 0.8%. Two square cuboid enclosures were used with sizes 30 × 30 × H cm3, where H is the inside thickness of the enclosures. This led to two different enclosure aspect ratios (κ = H/30 = 0.033 and 0.066). Four inclination angles to the horizontal position of the enclosures were used: 0°, 30°, 60°, and 90°. The crucial thermophysical properties of the synthetic nanofluid were obtained. The thermal conductivity of the nanofluid was measured experimentally at various volume concentrations. Furthermore, the viscosity and density were also measured experimentally at temperatures ranging from 15 to 40 °C as a function of the volume concentration. The heat transfer data were generated by heating the lower surface of the enclosure using a uniform flexible heat flux heater. The opposite surface was cooled using an air fan. The results of the experimental physical parameter measurements show that the percent of maximum deviation in thermal conductivity with those in the literature were 6.61% at a 1.0% volume concentration. The deviation of dynamic viscosity was between 0.21% and 16.36% at 0.1% and 1% volume concentrations, respectively, and for density it was 0.29% at 40 °C and a 1% volume concentration. The results showed up to a 27% enhancement in the Nusselt number at an angle of 60° and a 0.4% volume concentration in the largest aspect ratio (κ = 0.066). However, for the low aspect ratio enclosure (κ = 0.033), there was no noticeable improvement in heat transfer at any combination of volume concentration and inclination angle. The results show that the inclination angle is a significant factor in natural convection only for large aspect ratio enclosures. Furthermore, for large aspect ratio, the Nusselt number increased until the angle approached 60°, then it decreased again.
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Affiliation(s)
| | - Mohamed ElSayed Ali
- Mechanical Engineering Department, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia; (R.A.); (K.A.-S.)
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Ali N. Graphene-Based Nanofluids: Production Parameter Effects on Thermophysical Properties and Dispersion Stability. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:357. [PMID: 35159702 PMCID: PMC8838429 DOI: 10.3390/nano12030357] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2022] [Revised: 01/18/2022] [Accepted: 01/21/2022] [Indexed: 02/04/2023]
Abstract
In this study, the thermophysical properties and dispersion stability of graphene-based nanofluids were investigated. This was conducted to determine the influence of fabrication temperature, nanomaterial concentration, and surfactant ratio on the suspension effective properties and stability condition. First, the nanopowder was characterized in terms of crystalline structure and size, morphology, and elemental content. Next, the suspensions were produced at 10 °C to 70 °C using different concentrations of surfactants and nanomaterials. Then, the thermophysical properties and physical stability of the nanofluids were determined. The density of the prepared nanofluids was found to be higher than their base fluid, but this property showed a decrease with the increase in fabrication temperature. Moreover, the specific heat capacity showed very high sensitivity toward the graphene and surfactant concentrations, where 28.12% reduction in the property was achieved. Furthermore, the preparation temperature was shown to be the primary parameter that effects the nanofluid viscosity and thermal conductivity, causing a maximum reduction of ~4.9% in viscosity and ~125.72% increase in thermal conductivity. As for the surfactant, using low concentration demonstrated a short-term stabilization capability, whereas a 1:1 weight ratio of graphene to surfactant and higher caused the dispersion to be physically stable for 45 consecutive days. The findings of this work are believed to be beneficial for further research investigations on thermal applications of moderate temperatures.
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Affiliation(s)
- Naser Ali
- Nanotechnology and Advanced Materials Program, Energy and Building Research Center, Kuwait Institute for Scientific Research, Safat 13109, Kuwait
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Moshfeghi R, Toghraie D. An analytical and statistical review of selected researches in the field of estimation of rheological behavior of nanofluids. POWDER TECHNOL 2022. [DOI: 10.1016/j.powtec.2021.117076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Almurtaji S, Ali N, Teixeira JA, Addali A. Effect of Multi-Walled Carbon Nanotubes-Based Nanofluids on Marine Gas Turbine Intercooler Performance. NANOMATERIALS 2021; 11:nano11092300. [PMID: 34578617 PMCID: PMC8466608 DOI: 10.3390/nano11092300] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 08/25/2021] [Accepted: 08/28/2021] [Indexed: 12/15/2022]
Abstract
Coolants play a major role in the performance of heat exchanging systems. In a marine gas turbine engine, an intercooler is used to reduce the compressed gas temperature between the compressor stages. The thermophysical properties of the coolant running within the intercooler directly influence the level of enhancement in the performance of the unit. Therefore, employing working fluids of exceptional thermal properties is beneficial for improving performance in such applications, compared to conventional fluids. This paper investigates the effect of utilizing nanofluids for enhancing the performance of a marine gas turbine intercooler. Multi-walled carbon nanotubes (MWCNTs)-water with nanofluids at 0.01–0.10 vol % concentration were produced using a two-step controlled-temperature approach ranging from 10 °C to 50 °C. Next, the thermophysical properties of the as-prepared suspensions, such as density, thermal conductivity, specific heat capacity, and viscosity, were characterized. The intercooler performance was then determined by employing the measured data of the MWCNTs-based nanofluids thermophysical properties in theoretical formulae. This includes determining the intercooler effectiveness, heat transfer rate, gas outlet temperature, coolant outlet temperature, and pumping power. Finally, a comparison between a copper-based nanofluid from the literature with the as-prepared MWCNTs-based nanofluid was performed to determine the influence of each of these suspensions on the intercooler performance.
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Affiliation(s)
- Salah Almurtaji
- School of Aerospace, Transport and Manufacturing (SATM), Cranfield University, Cranfield MK43 0AL, UK; (J.A.T.); (A.A.)
- Kuwait Army, Kuwait Ministry of Defense, Safat 13128, Kuwait
- Correspondence:
| | - Naser Ali
- Kuwait Institute for Scientific Research, Energy and Building Research Center, Nanotechnology and Applications Program, Safat 13109, Kuwait;
| | - Joao A. Teixeira
- School of Aerospace, Transport and Manufacturing (SATM), Cranfield University, Cranfield MK43 0AL, UK; (J.A.T.); (A.A.)
| | - Abdulmajid Addali
- School of Aerospace, Transport and Manufacturing (SATM), Cranfield University, Cranfield MK43 0AL, UK; (J.A.T.); (A.A.)
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