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Zhao P, Liu W, Liu W, Shen Y, Cui B, Zhao Q. Novel low-foam viscous cationic collector 2-[2-(Tetradecylamino)ethoxy]ethanol: design, synthesis, and flotation performance study to quartz. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122633] [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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2
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Fang J, Ge Y, Chen Z, Xing B, Bao S, Yong Q, Chi R, Yang S, Ni BJ. Flotation purification of waste high-silica phosphogypsum. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 320:115824. [PMID: 35932745 DOI: 10.1016/j.jenvman.2022.115824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 07/18/2022] [Accepted: 07/19/2022] [Indexed: 06/15/2023]
Abstract
High-silica phosphogypsum (PG) is a kind of industrial by-product with great utilization potential. However, it is difficult to reuse PG directly due to the related gangue minerals (e.g., SiO2), and thus efficient purification is required to allow its further applications. Herein, a typical high-silica phosphogypsum waste was purified by a new "reverse-direct flotation" method. The organic matters and fine slimes were removed by reverse flotation, and then, the silica impurity was removed by direct flotation. Via the closed-circuit flotation process, the whiteness of the PG concentrate is improved from 33.23 to 63.42, and the purity of gypsum in the PG concentrate increases from 83.90% to 96.70%, with a gypsum recovery of 85%. Additionally, the content of SiO2 is significantly reduced from 11.11% to 0.07%. In-depth investigations suggest that the difference in the floatability of gypsum and quartz is prominently intensified by flotation reagents at pH = 2-2.5, and thus leads to good desilication performance. Further characteristics of the PG concentrate prove that impurities have been well removed, and the PG concentrate meets the requirement of related standards for gypsum building materials. The flotation method reported here paves the way for the purification of high-silica phosphogypsum, which can be extended to the purification and value-added reutilization of other industrial solid wastes.
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Affiliation(s)
- Ji Fang
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
| | - Yingyong Ge
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Zhijie Chen
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW, 2007, Australia
| | - Baolin Xing
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, 454003, China.
| | - Shenxu Bao
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China
| | - Qing Yong
- Hubei Three Gorges Laboratory, Yichang, 443007, China
| | - Ruan Chi
- Hubei Three Gorges Laboratory, Yichang, 443007, China
| | - Siyuan Yang
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China.
| | - Bing-Jie Ni
- Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, NSW, 2007, Australia
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Wang J, Cao Y, Li G. Comparative Study on the Spreading Behavior of Oil Droplets over Teflon Substrates in Different Media Environments. Polymers (Basel) 2022; 14:polym14142828. [PMID: 35890608 PMCID: PMC9316502 DOI: 10.3390/polym14142828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 06/17/2022] [Accepted: 06/20/2022] [Indexed: 11/16/2022] Open
Abstract
This paper comparatively investigated the spreading process of an oil droplet on the surface of highly hydrophobic solid (Teflon) in air and water media using a high-speed imaging technology, and analyzed their differences in spreading behavior from the perspective of empirical relations and energy conservation. Furthermore, the classical HD and MKT wetting models were applied to describe the oil droplet spreading dynamics to reveal the spreading mechanism of oil droplets on the Teflon in different media environments. Results showed that the entire spreading process of oil droplets on Teflon in air could be separated into three stages: the early linear fast spreading stage following θ(t)=θ0+kt , the intermediate exponential slow spreading stage obeying θ(t)=bt−3α, and the late spreading stage described by θ(t)=θeq+a×exp(−t/T). However, the dynamics behavior of dynamic contact angle during the oil droplet spreading on Teflon in water could be well described by these expressions, θ(t)=θ0+kt and θ(t)=θeq+a×exp(−t/T). Clearly, a significant difference in the oil droplet spreading behavior in air and water media was found, and the absence of the intermediate exponential spreading stage in the oil–water–Teflon system could be attributed to the difference in the dissipated energy of the system because the dissipation energy in the oil–water–solid system included not only the viscous dissipation energy of the boundary layer of oil droplet, but also that of the surrounding water which was not included in the dissipation energy of the oil–air–solid system. Moreover, the quantitative analysis of wetting models suggested that the MKT model could reasonably describe the late spreading dynamics of oil droplets (low TPCL velocities), while the HD model may be more suitable for describing the oil droplet spreading dynamics at the early and intermediate spreading stages (high TPCL velocities).
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Affiliation(s)
- Junchao Wang
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China;
- School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
| | - Yijun Cao
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology, Xuzhou 221116, China;
- School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou 450001, China;
- Correspondence:
| | - Guosheng Li
- School of Chemical Engineering and Technology, Zhengzhou University, Zhengzhou 450001, China;
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Mérai L, Deák Á, Dékány I, Janovák L. Fundamentals and utilization of solid/ liquid phase boundary interactions on functional surfaces. Adv Colloid Interface Sci 2022; 303:102657. [PMID: 35364433 DOI: 10.1016/j.cis.2022.102657] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 03/23/2022] [Accepted: 03/24/2022] [Indexed: 12/16/2022]
Abstract
The affinity of macroscopic solid surfaces or dispersed nano- and bioparticles towards liquids plays a key role in many areas from fluid transport to interactions of the cells with phase boundaries. Forces between solid interfaces in water become especially important when the surface texture or particles are in the colloidal size range. Although, solid-liquid interactions are still prioritized subjects of materials science and therefore are extensively studied, the related literature still lacks in conclusive approaches, which involve as much information on fundamental aspects as on recent experimental findings related to influencing the wetting and other wetting-related properties and applications of different surfaces. The aim of this review is to fill this gap by shedding light on the mechanism-of-action and design principles of different, state-of-the-art functional macroscopic surfaces, ranging from self-cleaning, photoreactive or antimicrobial coatings to emulsion separation membranes, as these surfaces are gaining distinguished attention during the ongoing global environmental and epidemic crises. As there are increasing numbers of examples for stimulus-responsive surfaces and their interactions with liquids in the literature, as well, this overview also covers different external stimulus-responsive systems, regarding their mechanistic principles and application possibilities.
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Wang C, Liu Y, Wang N, Zhang Y, Zhang L, Zhao S. Effects of catanionic surfactant mixture adsorption on the wettability of PTFE and PMMA. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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6
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Chen Z, Yang X, Wang B, Dai J, Bai Z. Adhesion behavior of oil droplets on solid surface with different wettability and inclined angle in water. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2021.1950547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Zhiwen Chen
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| | - Xiaoyong Yang
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| | - Bingjie Wang
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| | - Jian Dai
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
| | - Zhishan Bai
- School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, P.R. China
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Piepiórka-Stepuk J, Sterczyńska M, Kalak T, Jakubowski M. Predictive Model for the Surface Tension Changes of Chemical Solutions Used in a Clean-in-Place System. MATERIALS 2021; 14:ma14133479. [PMID: 34206611 PMCID: PMC8269464 DOI: 10.3390/ma14133479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 06/15/2021] [Accepted: 06/17/2021] [Indexed: 11/16/2022]
Abstract
The paper presents the results concerning the influence of concentration and storage time on the equilibrium surface tension of chemical solutions used in a clean-in place (CIP) system. Standard cleaning solutions (prepared under laboratory conditions) and industrial solutions (used in a CIP system in a brewery) were subjected to tests. Solutions from the brewery were collected after being regenerated and changes in equilibrium surface tension were studied during a three-month storage. In the statistical analysis of the solutions, standard deviations were determined in relation to the averages, and a Tukey’s multiple comparison test was performed to determine the effect of dependent variables on the surface tension of solutions. From the results, a nonlinear regression model was developed that provided a mathematical description of the kinetics of changes in the wetting properties of the solutions during their storage. A linear–logarithmic function was adopted to describe the regeneration. Numerical calculations were performed based on the nonlinear least squares method using the Gauss–Newton algorithm. The adequacy of the regression models with respect to the empirical data was verified by the coefficient of determination R and the standard error of estimation Se. The results showed that as the concentration of the substance in the cleaning solution increased, its wetting properties decreased. The same effect was observed with increased storage time as the greatest changes occurred during the first eight weeks. The study also showed that the use of substances to stabilize the cleaning solutions prevented deterioration of their wetting properties, regardless of the concentration of the active substance or storage time.
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Affiliation(s)
- Joanna Piepiórka-Stepuk
- Department of Mechanical Engineering, Division of Food Industry Processes and Facilities, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland; (M.S.); (M.J.)
- Correspondence:
| | - Monika Sterczyńska
- Department of Mechanical Engineering, Division of Food Industry Processes and Facilities, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland; (M.S.); (M.J.)
| | - Tomasz Kalak
- Department of Industrial Products and Packaging Quality, Institute of Quality Science, Poznań University of Economics and Business, Niepodległości 10, 61-875 Poznań, Poland;
| | - Marek Jakubowski
- Department of Mechanical Engineering, Division of Food Industry Processes and Facilities, Koszalin University of Technology, Racławicka 15-17, 75-620 Koszalin, Poland; (M.S.); (M.J.)
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Wettability of a Polymethylmethacrylate Surface by Extended Anionic Surfactants: Effect of Branched Chains. Molecules 2021; 26:molecules26040863. [PMID: 33562067 PMCID: PMC7915921 DOI: 10.3390/molecules26040863] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 01/31/2021] [Accepted: 02/02/2021] [Indexed: 11/16/2022] Open
Abstract
The adsorption behaviors of extended anionic surfactants linear sodium dodecyl(polyoxyisopropene)4 sulfate (L-C12PO4S), branched sodium dodecyl(polyoxyisopropene)4 sulfate (G-C12PO4S), and branched sodium hexadecyl(polyoxyisopropene)4 sulfate (G-C16PO4S) on polymethylmethacrylate (PMMA) surface have been studied. The effect of branched alkyl chain on the wettability of the PMMA surface has been explored. To obtain the adsorption parameters such as the adhesional tension and PMMA-solution interfacial tension, the surface tension and contact angles were measured. The experimental results demonstrate that the special properties of polyoxypropene (PO) groups improve the polar interactions and allow the extended surfactant molecules to gradually adsorb on the PMMA surface by polar heads. Therefore, the hydrophobic chains will point to water and the solid surface is modified to be hydrophobic. Besides, the adsorption amounts of the three extended anionic surfactants at the PMMA-liquid interface are all about 1/3 of those at the air-liquid interface before the critical micelle concentration (CMC). However, these extended surfactants will transform their original adsorption behavior after CMC. The surfactant molecules will interact with the PMMA surface with the hydrophilic heads towards water and are prone to form aggregations at the PMMA-liquid interface. Therefore, the PMMA surface will be more hydrophilic after CMC. In the three surfactants, the branched G-C16PO4S with two long alkyl chains exhibits the strongest hydrophobic modification capacity. The linear L-C12PO4S is more likely to densely adsorb at the PMMA-liquid interface than the branched surfactants, thus L-C12PO4S possesses the strongest hydrophilic modification ability and shows smaller contact angles on PMMA surface at high concentrations.
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Wang J, Cao Y, Xing Y, Li G, Liao Y, Li S, An M. Spreading behavior of oil droplets over polytetrafluoroethylene plates in deionized water. J DISPER SCI TECHNOL 2019. [DOI: 10.1080/01932691.2019.1645025] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Junchao Wang
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology , Xuzhou , Jiangsu , China
- School of Chemical Engineering and Technology, China University of Mining and Technology , Xuzhou , Jiangsu , China
| | - Yijun Cao
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology , Xuzhou , Jiangsu , China
- Henan Province Industrial Technology Research Institution of Resources and Materials, Zhengzhou University , Zhengzhou , Henan , China
| | - Yaowen Xing
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology , Xuzhou , Jiangsu , China
| | - Guosheng Li
- School of Chemical Engineering and Technology, China University of Mining and Technology , Xuzhou , Jiangsu , China
| | - Yinfei Liao
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology , Xuzhou , Jiangsu , China
| | - Shulei Li
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology , Xuzhou , Jiangsu , China
| | - Maoyan An
- Chinese National Engineering Research Center of Coal Preparation and Purification, China University of Mining and Technology , Xuzhou , Jiangsu , China
- School of Chemical Engineering and Technology, China University of Mining and Technology , Xuzhou , Jiangsu , China
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10
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Taguta J, O’Connor C, McFadzean B. The relationship between enthalpy of immersion and flotation response. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.08.059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Specific anion effects on adsorption and packing of octadecylamine hydrochloride molecules at the air/water interface. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.03.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Some physicochemical aspects of water-soluble mineral flotation. Adv Colloid Interface Sci 2016; 235:190-200. [PMID: 27346329 DOI: 10.1016/j.cis.2016.06.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Revised: 05/19/2016] [Accepted: 06/06/2016] [Indexed: 11/22/2022]
Abstract
Some physicochemical aspects of water-soluble mineral flotation including hydration phenomena, associations and interactions between collectors, air bubbles, and water-soluble mineral particles are presented. Flotation carried out in saturated salt solutions, and a wide range of collector concentrations for effective flotation of different salts are two basic aspects of water-soluble mineral flotation. Hydration of salt ions, mineral particle surfaces, collector molecules or ions, and collector aggregates play an important role in water-soluble mineral flotation. The adsorption of collectors onto bubble surfaces is suggested to be the precondition for the association of mineral particles with bubbles. The association of collectors with water-soluble minerals is a complicated process, which may include the adsorption of collector molecules or ions onto such surfaces, and/or the attachment of collector precipitates or crystals onto the mineral surfaces. The interactions between the collectors and the minerals include electrostatic and hydrophobic interactions, hydrogen bonding, and specific interactions, with electrostatic and hydrophobic interactions being the common mechanisms. For the association of ionic collectors with minerals with an opposite charge, electrostatic and hydrophobic interactions could have a synergistic effect, with the hydrophobic interactions between the hydrophobic groups of the previously associated collectors and the hydrophobic groups of oncoming collectors being an important attractive force. Association between solid particles and air bubbles is the key to froth flotation, which is affected by hydrophobicity of the mineral particle surfaces, surface charges of mineral particles and bubbles, mineral particle size and shape, temperature, bubble size, etc. The use of a collector together with a frother and the use of mixed surfactants as collectors are suggested to improve flotation.
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Aghazadeh S, Mousavinezhad SK, Gharabaghi M. Chemical and colloidal aspects of collectorless flotation behavior of sulfide and non-sulfide minerals. Adv Colloid Interface Sci 2015; 225:203-17. [PMID: 26601925 DOI: 10.1016/j.cis.2015.09.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/12/2015] [Accepted: 09/15/2015] [Indexed: 10/23/2022]
Abstract
Flotation has been widely used for separation of valuable minerals from gangues based on their surface characterizations and differences in hydrophobicity on mineral surfaces. As hydrophobicity of minerals widely differs from each other, their separation by flotation will become easier. Collectors are chemical materials which are supposed to make selectively valuable minerals hydrophobic. In addition, there are some minerals which based on their surface and structural features are intrinsically hydrophobic. However, their hydrophobicities are not strong enough to be floatable in the flotation cell without collectors such as sulfide minerals, coal, stibnite, and so forth. To float these minerals in a flotation cell, their hydrophobicity should be increased in specific conditions. Various parameters including pH, Eh, size distribution, mill types, mineral types, ore characterization, and type of reaction in flotation cells affect the hydrophobicity of minerals. Surface analysis results show that when sulfide minerals experience specific flotation conditions, the reactions on the surface of these minerals increase the amount of sulfur on the surface. These phenomenons improve the hydrophobicity of these minerals due to strong hydrophobic feature of sulfurs. Collectorless flotation reduces chemical material consumption amount, increases flotation selectivity (grade increases), and affects the equipment quantities; however, it can also have negative effects. Some minerals with poor surface floatability can be increased by adding some ions to the flotation system. Depressing undesirable minerals in flotation is another application of collectorless flotation.
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Davanlou A, Kumar R. Thermally induced collision of droplets in an immiscible outer fluid. Sci Rep 2015; 5:9531. [PMID: 25948547 PMCID: PMC5386213 DOI: 10.1038/srep09531] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 03/10/2015] [Indexed: 11/09/2022] Open
Abstract
Micro-total analysis systems (μTAS) have attracted wide attention and are identified as a promising solution for sample transport, filtration, chemical reactions, separation and detection. Despite their popularity, the selection of an appropriate mechanism for droplet transport and coalescence has always been a challenge. This paper investigates the use of Marangoni flow as a mechanism for levitating and transporting droplets on immiscible liquid films at higher speeds than is possible currently. For the first time, we show that it is possible to realize the natural coalescence of droplets through Marangoni effect without any external stimulation, and deliver the coalesced droplet to a certain destination through the use of surface tension gradients. The effects of shape and size on collision outcome are studied. Regions of coalescence and stretching separation of colliding droplets are delineated based on Weber number and impact number. In addition, the effect of viscosity on post collision regimes is studied. The findings in this fundamental study can be beneficial to many applications such as welding, drug delivery and microfluidics devices in controlling small droplets and targeting them to various locations.
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Affiliation(s)
- Ashkan Davanlou
- Mechanical &Aerospace Engineering, University of Central Florida, Orlando, Florida 32816, USA
| | - Ranganathan Kumar
- Mechanical &Aerospace Engineering, University of Central Florida, Orlando, Florida 32816, USA
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