Effect of PEG functionalized carbon nanotubes on the enhancement of thermal and physical properties of nanofluids

Manasrah, Abdallah D.; Laoui, Tahar; Zaidi, Syed Javaid; Atieh, Muataz Ali

doi:10.1016/j.expthermflusci.2017.02.018

Cited by 44 publications

(32 citation statements)

References 62 publications

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“…In one of the earlier reports, there was no significant change in the viscosity of NFs over a wider concentration range from 1 to 10 wt.% CuO [51]. The viscosity increase of NFs, as witnessed in this work, with increasing temperature is explained by the fact that the increase in temperature does not weaken the intermolecular forces between the NPs and the base liquid (water) in NFs [52]. The Arrhenius expression was used for representing the activation energy, according to Moore et al [53], η = Ae Q/RT (2) where Q is the apparent activation energy of flow and A is the pre-exponential term with an activation entropy significance.…”

Section: Physicochemical Properties Of the Nfssupporting

confidence: 70%

A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids

et al. 2019

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Copper oxide (CuO) and cerium oxide (CeO2) of various concentrations have been prepared through an ultrasonically assisted dispersion of CuO and CeO2 nanoparticles (NPs) in which water and nanofluids (NFs) were formulated. The morphological properties of the CuO and CeO2 NPs are reported. Few of the physicochemical properties that can influence the photocatalytic activities of the NFs are evaluated, such as viscosity, activation energy, density, thermal conductivity, electrical conductivity, alternating current (AC) conductivity, pH, stability, refractive index and optical band gap of the CuO and CeO2 NFs. Viscosity studies have been made at four different temperatures (303 K, 308 K, 313 K and 318 K) and the activation energy is calculated and compared between the CuO and CeO2 NFs. The thermal conductivity of the two NFs is calculated and compared. Electrical conductivity is measured for CuO and CeO2 NFs using an impedance analyzer at different frequencies at 303 K. The dielectric constant and AC conductivity were studied. The electrical conductivity and pH of the prepared NFs are measured and the results are compared. The stability of the NFs is determined from Zeta potential values obtained from dynamic light scattering measurements. UV-Visible diffuse reflectance measurements were used to deduce the optical bandgap of the respective metal oxide NPs in the NFs. The photocatalytic efficiencies of the CuO NFs and CeO2 NFs were evaluated using methylene blue (MB) as the model dye. The rate constant for the photodegradation of MB was higher for CuO NF as compared CeO2 NF and also higher than simple NPs-based photocatalysts. A plausible explanation for the role of NFs over the simple NPs-based photocatalytic solution is presented.

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Section: Physicochemical Properties Of the Nfssupporting

confidence: 70%

A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids

et al. 2019

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“…28 The unusual enhancement in the specic heat capacity of nanouids could be explained based on our proposed mechanisms in the previous works. 28,50 Accordingly, the rst mechanism depends on the dispersion of nanoparticles which acting as the heat sink between the CNTs networks. This phenomenon was satised by modifying the surface of CNT physically with hydrophilic materials and mechanically by applying the ultrasonic sonication waves to break down the van der Waals interaction forces, thus enhancing the nanoparticles dispersion in water.…”

Section: The Thermal Properties Of Nanouidsmentioning

confidence: 99%

“…This phenomenon was satised by modifying the surface of CNT physically with hydrophilic materials and mechanically by applying the ultrasonic sonication waves to break down the van der Waals interaction forces, thus enhancing the nanoparticles dispersion in water. 45,50 The second mechanism basically relates to the interfacial interactions forces between the nanoparticles and water which play a major role in changing the water characteristic, thus altering its thermal properties. The third mechanism corresponds to the unique thermal properties of nanoparticles which allowing the nanouid to store the heat faster than water and reaching the maximum capacity within a shorter time and evenly distributing the heat in the water.…”

Section: The Thermal Properties Of Nanouidsmentioning

confidence: 99%

“…[42][43][44][45] Accordingly, many researchers have studied the thermophysical properties of nanouids using CNTs. [46][47][48][49][50] The properties of the nanouids can be enhanced and modied to meet the application inquires by controlling the nanoparticles properties including; textural properties, morphology and topology and the nanouids concentrations and operation conditions, taking in consideration the nanouids' stability. 28,[50][51][52][53] Hence, the agglomeration of nanoparticles which destabilize the nanouids behaviours can affect heat transfer process.…”

Section: Introductionmentioning

confidence: 99%

“…54,55 To overcome this challenge and get a homogenous solution of nanouid, different strategies have been implemented such as chemical, physical and mechanical methods. [56][57][58][59][60][61] In our previous study, 50 the enhancement of both specic heat capacity and thermal conductivity of nanouids free of surfactants using carbon nanotubes chemically functionalized with polyethylene glycol has been investigated. As a continuation of our previous work, this study mainly focused on the thermophysical properties of nanouids with impregnated copper oxide on the surface of CNTs (CNT-CuO/water nanouids).…”

Section: Introductionmentioning

confidence: 99%

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Surface modification of carbon nanotubes with copper oxide nanoparticles for heat transfer enhancement of nanofluids

et al. 2018

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Efficient and Traceable Tamoxifen Delivery to Breast Cancer Cells Using Folic Acid‐Decorated and PEGylated Graphene Quantum Dots

Amraee,

Torbati,

Majd

et al. 2023

ChemistrySelect

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Graphene quantum dots (GQDs) possess potential properties for the targeted transport and tracking of anticancer medication to tumor cells. For this purpose, the synthesized GQDs were decorated with folic acid (FA) and methoxy polyethylene glycol (mPEG2000), and finally loaded with tamoxifen (TMX) drug. The synthesized nano‐drug was characterized using FTIR, XRD, UV‐Vis, PL, HRTEM, FESEM, and DLS analytical devices. Based on the obtained data, the average hydrodynamic diameter of particles dissolved in water was 294.7 nm and the size of dehydrated particles was between 53 and 210 nm. PL data showed that prepared nanoparticles have an emission wavelength of 438 nm, which is in the blue fluorescent wavelength range, thus making these nanoparticles suitable for cell imaging. The encapsulation efficiency and loading percentage of tamoxifen in nanoparticles were calculated at about 52.5 % and 30 %, respectively, and cumulative drug release reached 89 % within 42 hours. The cytotoxicity effects of nanoparticles were investigated. According to IC50 results, the targeted mPEG‐GQDs‐FA/TMX (TMX‐FPGs) nano‐drug was more toxic than free TMX on MCF‐7 cells and had reduced side effects on healthy HDF cells. TMX‐FPGs induced apoptosis cell death, significantly. The confocal imaging experiments showed that TMX‐FPGs are appropriate for monitoring and targeting MCF‐7 cells.

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Effect of PEG functionalized carbon nanotubes on the enhancement of thermal and physical properties of nanofluids

Cited by 44 publications

References 62 publications

A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids

A Comparative Evaluation of Physicochemical Properties and Photocatalytic Efficiencies of Cerium Oxide and Copper Oxide Nanofluids

Surface modification of carbon nanotubes with copper oxide nanoparticles for heat transfer enhancement of nanofluids

Efficient and Traceable Tamoxifen Delivery to Breast Cancer Cells Using Folic Acid‐Decorated and PEGylated Graphene Quantum Dots

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