Nano-Structures & Nano-Objects最新文献

{"title":"Synthesis and characterization of nano-hydroxyapatite from carbide lime waste through a green conversion approach","authors":"Navneet Kaur ,&nbsp;Rohit Kumar ,&nbsp;Kavindra Kumar Kesari ,&nbsp;Piyush Kumar Gupta ,&nbsp;Anjuvan Singh","doi":"10.1016/j.nanoso.2025.101433","DOIUrl":"10.1016/j.nanoso.2025.101433","url":null,"abstract":"<div><div>Annually, a substantial quantity of industrial waste is generated globally, and the build-up of this waste poses a serious risk to society. The generation of carbide lime waste as a byproduct during acetylene gas production in industries has resulted in many environmental issues. This study attempts to convert carbide lime waste into nanohydroxyapatite (nHAp) that can be used to treat patients suffering from orthopaedic injuries. The synthesis of nHAp from carbide lime was carried out by chemical precipitation method using 85 % orthophosphoric acid. The resulting nHAp was physicochemically characterized by different instruments. Fourier Transform Infrared Spectroscopy (FTIR) was used to analyze the functional groups to confirm the conversion of carbide lime. The structural analysis of the synthesized nHAp was done by X-Ray Diffractometer (XRD). Field Emission Scanning Electron Microscopy (FESEM) was used to find the morphology of nHAp particles. The elemental composition of nHAp was studied by Energy Dispersive X-ray Spectroscopy (EDX). The hydrodynamic size of nHAp was calculated by the nano-zeta sizer instrument. Thermo Gravimetric Analyzer (TGA) studied the thermal behaviour of nHAp and carbide lime. Further, mechanical testing was carried out for nHAp using the Vickers microhardness test. In vitro tests, such as biodegradation and cell viability, were also conducted. As a result, the nHAp was found to be biocompatible and biodegradable. In the future, this nHAp biomaterial can be modified for different biomedical applications.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"41 ","pages":"Article 101433"},"PeriodicalIF":5.45,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100758","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Green synthesis by carambola fruit juice coprecipitation route, effect of nickel doping, and optical properties of spherical copper oxide nanoparticles","authors":"Ekane Peter Etape ,&nbsp;Beckley Victorine Namondo ,&nbsp;Roussin Lontio Fomekong ,&nbsp;Joso Bola Dora ,&nbsp;Kunsona Lovert Gana ,&nbsp;Nefenda Rodney ,&nbsp;Tanto Carine ,&nbsp;Ankoro Naphtali Odogu ,&nbsp;Josepha Foba-Tendo ,&nbsp;Lambi John Ngolui","doi":"10.1016/j.nanoso.2024.101423","DOIUrl":"10.1016/j.nanoso.2024.101423","url":null,"abstract":"<div><div>Doping CuO with Ni^2 + has been preferred because of the closeness of the ionic radii of Cu²⁺ (0.72 Å) and Ni²⁺ (0.69 Å) but the trends in crystallite sizes as a consequence of Ni^2+_ doping has been contradicted. Therefore, an independent study on the effect of doping CuO with Ni²⁺ was necessary. In this study, spherical nanostructured pure and nickel-doped cupric oxide (CuO) are synthesised by co-precipitation using Carambola fruit juice. The single molecular precursors are decomposed at a predetermined decomposition temperature of 350°C for 3 h. The Nickel doping concentrations used are 2.0 %, 4.0 %, 6.0 %, and 10.0 %. The single molecular precursors obtained were characterised by IR and TGA, while the decomposed samples were characterised by IR, SEM/EDS, PXRD, and UV–vis. The IR results revealed that the single molecular precursors were metal oxalates, whereas the decomposed samples were metal oxides (CuO and Ni-doped CuO). The SEM results show discrete spherical nanoparticles with a predominant spherical shape but with the porous morphology and particle size varying as Ni²⁺ are introduced in the CuO matrix. The EDS results indicate the presence of Cu and the progressive incorporation of Ni²⁺ ions in the CuO matrix., suggesting that the decomposed samples were CuO and Ni-doped CuO. X-ray diffraction (XRD) shows the formation of pure polycrystalline CuO with tenorite phases, which belong to the monoclinic structure. Two competing predominant adsorption peaks were observed corresponding to the (111) and (11͞1) crystal planes. Furthermore, the determination of crystal sizes from XRD data showed that the particle sizes ranged between 9 nm and 24 nm and, were greatly modified by the doping and dopant concentrations of Ni²⁺. The optical band gap of the decomposed samples fluctuated between 2.84 and 3.01 eV as the precursor concentration of nickel ions increased from 0.00 % to 10.0 %. Other unit cell parameters were calculated using particle size absorbance/transmittance data extracted from PXRD, and the results demonstrated an irregular trend. These results attribute the contradiction reported in literature to redistribution of particle sizes of the crystallites which correlate positively to the prevalent diffraction Braggs angles. Furthermore, the fundamental understanding of the effect of Ni²⁺ doping and increase in dopant concentration in the CuO matrix is governed by many factors including the size of the dopant ion, concentration of the dopant ions in the host matrix and morphology of the crystallites. These factors are all closely linked to the method of synthesis or crystallite growth.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"41 ","pages":"Article 101423"},"PeriodicalIF":5.45,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical study on thermal radiation and chemical reaction impacts on Prandtl nanofluid flow over a bilinear stretching sheet with heat generation and absorption: Response surface methodology","authors":"L. Padmavathi ,&nbsp;S.Geethan Kumar ,&nbsp;Charankumar Ganteda ,&nbsp;S.V.K. Varma ,&nbsp;E. Gouthami ,&nbsp;G. Jayalalitha ,&nbsp;B.Murali Mohan Rao ,&nbsp;Vediyappan Govindan ,&nbsp;Busayamas Pimpunchat ,&nbsp;Haewon Byeon","doi":"10.1016/j.nanoso.2025.101446","DOIUrl":"10.1016/j.nanoso.2025.101446","url":null,"abstract":"<div><div>The study focuses on the three-dimensional flow of a non-Newtonian Prandtl nanofluid with electrical conductivity, flowing over a bilinear expanding surface within a porous medium. These flows in porous medium are applied in water purification processes, petroleum industries and also chemical factories. The exploration examines various heat and mass transport phenomena, including the consequences of thermal radiation, thermophoresis, Brownian motion, substance response and heat source/sink. The governing partial differential equations are reformulated into a system of nonlinear ordinary differential equations through the application of appropriate similarity transformations. These equations are subsequently solved by using numerical methods bvp4c as well as shooting method. Furthermore, the arithmetical values for the friction factor and the temperature and accumulation constants are provided in tables. It is experiential that the Prandtl fluid constraint enhances the axial and transverse velocities, while the temperature sharing shows an inverse relationship. The temperature and concentration distributions have an opposite attitude with the influence of Brownian motion parameter.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"41 ","pages":"Article 101446"},"PeriodicalIF":5.45,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143437765","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of the effect of spherical nanoparticle additives on the properties of drilling fluids modified by carbon nanotubes","authors":"E.I. Lysakova,&nbsp;A.D. Skorobogatova,&nbsp;A.L. Neverov,&nbsp;A.V. Minakov","doi":"10.1016/j.nanoso.2025.101442","DOIUrl":"10.1016/j.nanoso.2025.101442","url":null,"abstract":"<div><div>The paper reflects the results of a comprehensive analysis on the effect of hybrid nano-additives, specifically 18 nm spherical silicon oxide nanoparticles (NPs) and single-walled carbon nanotubes (SWCNTs) on the basic functional properties of mineral oil-based drilling fluids (OBFs). The concentration of spherical NPs varied from 0.25 to 2 wt%, and the concentration of SWCNTs was 0.1 wt%. The developed methodology made it possible to obtain stable drilling emulsions modified with hybrid nanoadditives. The study investigated the impact of nano-additives on the rheology, antifriction, filtration and inhibition properties, colloidal stability of OBFs. The study demonstrated that nano-additives have a strong influence on all main properties of drilling emulsions. Carbon nanotubes enhance these effects even at very low concentrations, indicating the possibility of significant regulation of the main functional characteristics of drilling fluids (DFs).</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"41 ","pages":"Article 101442"},"PeriodicalIF":5.45,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143338490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of ZnS:Cu nanoparticle morphology during microwave-assisted hydrothermal synthesis","authors":"Milena Dile,&nbsp;Katrina Laganovska,&nbsp;Edgars Vanags,&nbsp;Reinis Ignatans,&nbsp;Virginija Vitola,&nbsp;Aleksejs Zolotarjovs,&nbsp;Madara Leimane,&nbsp;Ernests Einbergs,&nbsp;Krisjanis Smits","doi":"10.1016/j.nanoso.2025.101450","DOIUrl":"10.1016/j.nanoso.2025.101450","url":null,"abstract":"<div><div>Doped zinc sulfide (ZnS) nanomaterials have unique optical and electrical properties making them an outstanding material for design and fabrication of photoluminescent (PL) and electroluminescent devices. Structure, elemental composition and morphology of nanoparticles determine properties of the produced devices and are highly sensitive to reaction conditions. Therefore, real-time monitoring with an opportunity to extract a sufficient quantity of material for the field tests should be explored. This work is devoted to the study of morphological evolution of Cu-doped ZnS particles synthesised by microwave-assisted hydrothermal method (MWHT). This study demonstrates the feasibility for continuous monitoring of synthesis product properties, offering valuable insights into particle growth and formation processes, while also confirming the reproducibility of the described sampling procedure. The results verify formation of a cubic ZnS phase with crystallite size increasing from 2 to 5 nm during the synthesis. In addition, formation of the hexagonal ZnO was confirmed by X-ray powder diffraction. Scanning transmission electron microscopy (STEM) images elucidated the formation and growth processes of ZnS particles with different morphological signs. One group of particles was represented as the spherical particles formed from nanoclusters in various sizes due to slow decomposition of thiourea. The second group of flower-like particles was generated through a process where thin-like plates commence to grow on the surface of spherical particles. PL intensity of the resulting products with a band positioned at 2.00 eV indicated ⁴T₁ → ⁶A₁ transition between Cu²⁺ ion energy levels and experienced a blueshift over time.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"41 ","pages":"Article 101450"},"PeriodicalIF":5.45,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143402942","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anti-amyloid activity of amino acid functionalized magnetic nanoparticles on αLactalbumin aggregation","authors":"Andrea Antosova ,&nbsp;Miroslav Gancar ,&nbsp;Zuzana Bednarikova ,&nbsp;Iryna Antal ,&nbsp;Patrizia Verducci ,&nbsp;Olga Parmar ,&nbsp;Martina Kubovcikova ,&nbsp;Martina Koneracka ,&nbsp;Vlasta Zavisova ,&nbsp;Patrizio Graziosi ,&nbsp;Barbara Luppi ,&nbsp;Zuzana Gazova ,&nbsp;Eva Bystrenova","doi":"10.1016/j.nanoso.2024.101413","DOIUrl":"10.1016/j.nanoso.2024.101413","url":null,"abstract":"<div><div>Protein amyloid aggregation involves structural changes in native protein conformers and the formation of amyloid fibrils that accumulate in deposits in the human body. This study explores the effect of magnetic nanoparticles functionalized with amino acids (aaMNPs)—cysteine (Cys), poly-L-lysine (PLL), or proline (Pro)—on the amyloid aggregation of α-lactalbumin (αLA) and its amyloid fibrils (LAF). Our results from thioflavin T fluorescence assay (ThT), atomic force microscopy (AFM), and infrared spectroscopy revealed that the studied aaMNPs inhibit αLA fibrillization and destruct LAF in a concentration-dependent manner. The type of amino acid used for nanoparticle functionalization significantly influences the anti-amyloid efficacy. ProMNPs exhibit the highest inhibitory activity, with the timing of their addition being crucial Conversely, CysMNPs demonstrate the highest destructing activity. AFM image analysis through grain mapping was employed to quantify the anti-amyloid effects of aaMNPs. Cytotoxicity testing on kidney cells identified PLLMNPs as the only cytotoxic nanoparticles in our study. These findings clarify the mechanisms of inhibition and destruction of LAF in the presence of aaMNPs, which could inform the design of nanoparticles for therapeutic purposes in the future.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101413"},"PeriodicalIF":5.45,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Promising antibacterial performance of Ag-nanoparticles intercalated Nb2CTx MXene towards E. coli and S. aureus","authors":"Aamen Nasir ,&nbsp;Imran Haider Sajid ,&nbsp;Arooma Syed ,&nbsp;Fazal Adnan ,&nbsp;Syed Rizwan","doi":"10.1016/j.nanoso.2024.101415","DOIUrl":"10.1016/j.nanoso.2024.101415","url":null,"abstract":"<div><div>MXenes are a group of two-dimensional (2D), atomically thin transition metal carbides, nitrides and carbon nitrides with a variety of desirable characteristics. Due to their exceptional physiochemical characteristics and ultrathin lamellar structure, MXenes have shown excellent antibacterial capabilities. Two-dimensional Nb₂CT_x MXene has been recently analyzed for potential applications in antibacterial materials. Due to the development of antibiotic-resistant bacteria further materials or composite materials need to be explored. In this work, we report the antibacterial properties of a composite of Nb₂CT_x and silver, synthesized using electrostatic self-assembly method. This work also demonstrates the optimization of the etching of Nb₂CT_x MXene for different time intervals and delamination of Nb₂CT_x MXene by using two different solvents i.e., tetramethylammonium hydroxide (TMAOH) and isopropyl amine. The antibacterial characteristics of Nb₂CT_x MXene, delaminated Nb₂CT_x MXene and Nb₂CT_x-Ag composite of 1:1 and 2:1 were tested and compared. This study demonstrates that Nb₂CT_x-Ag composite shows higher antibacterial properties than Nb₂CT_x and delaminated Nb₂CT_x MXene and could reach an antibacterial activity of 98.5 % for <em>S. aureus</em> and 100 % for <em>E. coli</em>.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101415"},"PeriodicalIF":5.45,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Colloidal stability of nanosuspensions based on highly mineralized solutions","authors":"Roman Vaganov,&nbsp;Vladimir Zhigarev,&nbsp;Maxim Pryazhnikov,&nbsp;Andrey Minakov","doi":"10.1016/j.nanoso.2024.101414","DOIUrl":"10.1016/j.nanoso.2024.101414","url":null,"abstract":"<div><div>The potential use of nanosuspensions in enhanced oil recovery is currently under vigorous investigation. A large body of evidence supports the viability of this research direction. However, considerable challenges still remain in this area. One such challenge is the high degree of mineralization observed in formation water in many oil fields. In such conditions, nanosuspensions may exhibit low aggregation and sedimentation stability. This study represents a systematic investigation into the potential for improving the sedimentation stability of SiO₂ (18 nm) nanosuspensions prepared using highly mineralized water (up to 300 g/l) of varying composition. This is the first time such an investigation has been carried out. To stabilize SiO₂ nanosuspensions in mineralized water, the effect of various additives (ethylene diamine tetraacetate acid dynatrium salt solution, synthanol, starch, sodium citrate, ammonium tartrate, and malonic acid) was investigated at the concentrations up to 3 wt%. The impact of salt type and concentration, as well as stabilizer type and concentration on the colloidal stability of nanosuspensions was examined. The results demonstrate that nanosuspensions exhibit a loss of colloidal stability at salt concentrations above 100 g/l. Furthermore, their sedimentation stability in formation water is approximately two times lower than that in a NaCl-based solution with the same degree of mineralization. The results of the conducted studies indicate that the optimal stabilizing properties for nanosuspensions in highly mineralized waters are possessed by additives of malonic acid and sodium citrate at a concentration of 1 wt%.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101414"},"PeriodicalIF":5.45,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Single and multi-walled carbon nanotubes with radiative heat transfer over a porous medium: Featuring of Darcy–Forchheimer and thermal conductivity","authors":"Aaqib Majeed ,&nbsp;Parvez Ali ,&nbsp;Marouan Kouki","doi":"10.1016/j.nanoso.2024.101416","DOIUrl":"10.1016/j.nanoso.2024.101416","url":null,"abstract":"&lt;div&gt;&lt;div&gt;The present work is motivated by the need to enhance thermal conductivity, making them useful in cooling systems for electronics, automotive radiators, and heat exchangers. Single and multi-walled carbon nanotubes (CNTs) are renowned for their exceptional thermal conductivity, making them promising candidates for heat transfer enhancements. Two sorts of carbon nanotubes are reflected here i.e. single wall carbon nanotubes (SWCNTs) and multi-wall carbon nanotubes (MWCNTs) are considered here. SWCNTs &amp; MWCNTs have numerous applications in fluid mechanics. The purpose of the current investigation is to consider a classical problem of Navier’s Stokes equations and develop a mathematical for 3D Darcy–Forchheimer flow of SWCNTs &amp; MWCNTs carbon nanotubes over a stretchy surface with variable thermal conductivity and convective boundary constraints. The impact of thermal radiation, rotational effect, and velocity slip are also taken into account in the present model. A suitable transformation approach was implemented to convert the non-dimensional governing partial differential equation (PDEs) to ordinary differential equation (ODEs) ones. The transformed versions of the highly nonlinear coupled PDEs are drafted by adopting numerical scheme with Bvp4c MATLAB package. The ranges of the parameters used are: &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;Ω&lt;/mi&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.2&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.2&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mi&gt;Fr&lt;/mi&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.2&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.0&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;ϕ&lt;/mi&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;0.3&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;є&lt;/mi&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mi&gt;Rd&lt;/mi&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.2&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;, &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mi&gt;Bi&lt;/mi&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow&gt;&lt;mo&gt;(&lt;/mo&gt;&lt;mn&gt;0.1&lt;/mn&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mi&gt;λ&lt;/mi&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mo&gt;&lt;&lt;/mo&gt;&lt;mspace&gt;&lt;/mspace&gt;&lt;mn&gt;1.5&lt;/mn&gt;&lt;mo&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;. Outcomes of the various flow factors like rotational parameters, Prandtl number, velocity slip parameter, inertia coefficient, Biot number, variable thermal conductivity, and radiation parameter on velocity, temperature profiles are illustrated graphically and in the form of tables. Our inquiry au","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101416"},"PeriodicalIF":5.45,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142744233","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synthesis of ferrofluid using magnetite (Fe3O4), citric acid and deionized water and its characterizations for the application of a non-uniform magnetic thermosyphon","authors":"Anggito P. Tetuko ,&nbsp;Nining S. Asri ,&nbsp;Patrice Estellé ,&nbsp;Amdy Fachredzy ,&nbsp;Achmad M.S. Sebayang ,&nbsp;Daffa F. Rinjani ,&nbsp;Eko A. Setiadi ,&nbsp;Ayu Yuswita Sari ,&nbsp;Perdamean Sebayang","doi":"10.1016/j.nanoso.2024.101417","DOIUrl":"10.1016/j.nanoso.2024.101417","url":null,"abstract":"<div><div>The performance improvement of a thermosyphon for disseminating heat is significant for the thermal management of a system. Furthermore, the water as the working liquid in a thermosyphon has an operating limit. Therefore, adding particles in the nanofluids as a working liquid could improve the thermal properties of thermosyphon and boiling temperature. Additionally, the effects of a non-uniform magnetic field on the ferrofluid thermosyphon at three locations: evaporator, adiabatic, and condenser were analysed. In this investigation, a two-step method was utilized, the ferrofluid was synthesized using magnetite (Fe₃O₄), citric acid, and deionized water. First, the Fe₃O₄ nanoparticles and associated ferrofluid were fully characterized from X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), magnetic properties analysis, zeta potential, and thermal properties, respectively. Then, the performance of thermosyphon heat pipes filled using high filling ratios of 70, 80, 90, and 100 % of stable synthesized ferrofluid at 0.5 wt% were examined. The results were compared to water using similar filling ratios that have been experimentally evaluated. The thermosyphon heat pipe (copper container) has a diameter of 12.7 mm and a length of 200 mm. The thermal performance test of the thermosyphon filled using the ferrofluid suggested a thermal resistance decrease from 1.95 to 1.20 °C/W with filling ratios of 70–90 % of evaporator volume. The effective thermal conductivity of the thermosyphon is improved from 685 to 1160 W/m°C at similar filling ratios. On the other hand, higher thermal resistance and lower effective thermal conductivity of thermosyphon filled using water were obtained at similar filling ratios of 70–90 %. The values are 2.2–1.3 °C/W and 600–1000 W/m °C, respectively. Moreover, the thermosyphon filled using the ferrofluid with a filling ratio of 90 % and a non-uniform magnetic field (two sides) on the evaporator section has a thermal resistance and an effective thermal conductivity of 1.9 °C/W and 690 W/m °C. The result has a lower thermal conductivity value compared to the thermosyphon filled with ferrofluid without a non-uniform magnetic field at a similar filling ratio of 90 % of 1160 W/m °C. This occurs due to less particle deposition on the inner surface of the thermosyphon as an effect of the magnetic field. A non-uniform magnetic field effect to the several sections of the thermosyphon (e.g., evaporator, adiabatic, and condenser) as the novelty of the research required to be modified to optimize the results.</div></div>","PeriodicalId":397,"journal":{"name":"Nano-Structures & Nano-Objects","volume":"40 ","pages":"Article 101417"},"PeriodicalIF":5.45,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143161537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}