Syntheses of ferrofluids using polyethylene glycol (PEG) coated magnetite (Fe3O4), citric acid, and water as the working liquid in a cylindrical heat pipe

Asri, Nining S.; Tetuko, Anggito P.; Esmawan, Agung; Addin, Muhammad; Setiadi, Eko Arief; Putri, W. B. K.; Ginting, Masno; Sebayang, Perdamean

doi:10.1016/j.nanoso.2020.100654

Cited by 18 publications

(6 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…ATR-FTIR spectra of S1, selected for surface modification, before and after functionalization with CA and PAA are shown in Figure 3a. The ATR-FTIR spectra of bare S1 (black line) revealed a signature stretching Fe-O vibration at ~540 cm −1 , in line with the literature data [22]. The ATR-FTIR study was primarily conducted to confirm the presence of CA and PAA on the S1 surface following the functionalization processes (S1@CA and S1@PAA).…”

Section: Coating and Colloidal Properties Of Co-doped Magnetite Nanop...supporting

confidence: 78%

See 1 more Smart Citation

Synthesis, Surface Modification and Magnetic Properties Analysis of Heat-Generating Cobalt-Substituted Magnetite Nanoparticles

Ognjanović,

Bošković,

Kolev

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Here, we present the results of the synthesis, surface modification, and properties analysis of magnetite-based nanoparticles, specifically Co0.047Fe2.953O4 (S1) and Co0.086Fe2.914O4 (S2). These nanoparticles were synthesized using the co-precipitation method at 80 °C for 2 h. They exhibit a single-phase nature and crystallize in a spinel-type structure (space group Fd3¯m). Transmission electron microscopy analysis reveals that the particles are quasi-spherical in shape and approximately 11 nm in size. An observed increase in saturation magnetization, coercivity, remanence, and blocking temperature in S2 compared to S1 can be attributed to an increase in magnetocrystalline anisotropy due to the incorporation of Co ions in the crystal lattice of the parent compound (Fe3O4). The heating efficiency of the samples was determined by fitting the Box-Lucas equation to the acquired temperature curves. The calculated Specific Loss Power (SLP) values were 46 W/g and 23 W/g (under HAC = 200 Oe and f = 252 kHz) for S1 and S2, respectively. Additionally, sample S1 was coated with citric acid (Co0.047Fe2.953O4@CA) and poly(acrylic acid) (Co0.047Fe2.953O4@PAA) to obtain stable colloids for further tests for magnetic hyperthermia applications in cancer therapy. Fits of the Box-Lucas equation provided SLP values of 21 W/g and 34 W/g for CA- and PAA-coated samples, respectively. On the other hand, X-ray photoelectron spectroscopy analysis points to the catalytically active centers Fe2+/Fe3+ and Co2+/Co3+ on the particle surface, suggesting possible applications of the samples as heterogeneous self-heating catalysts in advanced oxidation processes under an AC magnetic field.

show abstract

Section: Coating and Colloidal Properties Of Co-doped Magnetite Nanop...supporting

confidence: 78%

“…The peak at 1384 cm −1 corresponds to the asymmetric stretching of C-O from the −COOH group. Additionally, the strong vibration band observed at 540 cm -1 is attributed to the Fe-O stretching vibrational mode of Co-doped magnetite, which is absent in the CA spectra [22].…”

Section: Coating and Colloidal Properties Of Co-doped Magnetite Nanop...mentioning

confidence: 93%

Synthesis, Surface Modification and Magnetic Properties Analysis of Heat-Generating Cobalt-Substituted Magnetite Nanoparticles

Ognjanović,

Bošković,

Kolev

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Bezaatpour and Rostamzadeh concluded that employing an external magnetic field with magnetite nanoparticles increases the heat transfer rate and results more efficiently compared to other methods. Likewise, Asri et al synthesized ferrofluids from magnetite nanoparticles, which are used as working fluids in cylindrical heat pipes, and found excellent thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Computer-Aided Modeling, Simulation, and Exergy Analysis of Large-Scale Production of Magnetite (Fe₃O₄) Nanoparticles via Coprecipitation

2021

View full text Add to dashboard Cite

Magnetite nanoparticles present attractive properties including high magnetization, low toxicity, adsorption capacity, and simple preparation, making them efficient in water purification processes, soil remediation, and biomedical applications. In this sense, there is growing interest in the production of magnetite nanoparticles; therefore, evaluating the performance of this process on a large scale gives relevant information to process designers. In this work, the simulation and exergy analysis of large-scale production of magnetite nanoparticles via coprecipitation were performed using computer-aided tools. The process was modeled for the production of 807 t/year of magnetite nanoparticles; the data for the simulation were obtained from the literature, and experimental results were developed by the authors. The exergy efficiency of the process was estimated at 0.046%. The exergy of waste was estimated to be 105 313 MJ/h, while the unavoidable exergy losses were 2941 MJ/h. Washing 2 and 3 represented the most critical stages of the process, contributing 95.12% of the total irreversibilities due to the waste exergy, which corresponds to the water and ethanol exergy discarded in these stages. These results show that the process must be improved from the energy point of view and require the implementation of process optimization strategies to reach a more sustainable design.

show abstract

“…The thermal performance of micro pulsating heat pipes was compared with that of various heat spreaders with different thicknesses, turns and channel widths. Recently, new working fluids have been used in heat pipes [21]- [23]. Nanofluids have been found to significantly improve the performance of heat pipes because their thermophysical properties are better than those of general fluids [24].…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Analysis of Flat Heat Pipe With Enhanced Microchannel Shape

Chen

Zhang

2021

IEEE Access

View full text Add to dashboard Cite

Flat heat pipe has many excellent characteristics such as high thermal conductivity, reversibility of heat flow direction and so on. In this paper, a flat heat pipe model with multiple microchannels is established, and the effects of different microchannel shapes and different materials on the heat transfer efficiency of flat heat pipe are studied. Then, based on the general rectangular and inverted trapezoidal microchannel shape, the enhancement is carried out. That is to fill a number of materials in the bottom of the microchannel to change the bottom shape of the microchannel. In the steady-state thermal simulation of flat heat pipe, the axial temperature of the flat heat pipe with enhanced microchannel shape is lower than that of the flat heat pipe with general microchannel, which shows that the enhanced microchannel shape is helpful to the heat dissipation of flat heat pipe. The fluid simulation results show that the enhanced rectangular microchannel shape can accelerate the current velocity of working fluid. Therefore, the flat heat pipe with enhanced microchannel shape has better heat transfer performance. In order to obtain the local temperature of flat heat pipe quickly, the transient analytical solution is provided. In this paper, the temperature field calculated by using transient analytical solution is compared with that simulated by COMSOL. The results show that the maximum error between the results of discrete heat source model and continuous heat source model calculated by transient solution and COMSOL simulation results is less than 2%.INDEX TERMS Flat heat pipe, microchannel shape, heat dissipation, analytical solution.

show abstract

Syntheses of ferrofluids using polyethylene glycol (PEG) coated magnetite (Fe3O4), citric acid, and water as the working liquid in a cylindrical heat pipe

Cited by 18 publications

References 57 publications

Synthesis, Surface Modification and Magnetic Properties Analysis of Heat-Generating Cobalt-Substituted Magnetite Nanoparticles

Synthesis, Surface Modification and Magnetic Properties Analysis of Heat-Generating Cobalt-Substituted Magnetite Nanoparticles

Computer-Aided Modeling, Simulation, and Exergy Analysis of Large-Scale Production of Magnetite (Fe₃O₄) Nanoparticles via Coprecipitation

Heat Transfer Analysis of Flat Heat Pipe With Enhanced Microchannel Shape

Contact Info

Product

Resources

About

Syntheses of ferrofluids using polyethylene glycol (PEG) coated magnetite (Fe3O4), citric acid, and water as the working liquid in a cylindrical heat pipe

Cited by 18 publications

References 57 publications

Synthesis, Surface Modification and Magnetic Properties Analysis of Heat-Generating Cobalt-Substituted Magnetite Nanoparticles

Synthesis, Surface Modification and Magnetic Properties Analysis of Heat-Generating Cobalt-Substituted Magnetite Nanoparticles

Computer-Aided Modeling, Simulation, and Exergy Analysis of Large-Scale Production of Magnetite (Fe3O4) Nanoparticles via Coprecipitation

Heat Transfer Analysis of Flat Heat Pipe With Enhanced Microchannel Shape

Contact Info

Product

Resources

About

Computer-Aided Modeling, Simulation, and Exergy Analysis of Large-Scale Production of Magnetite (Fe₃O₄) Nanoparticles via Coprecipitation