Role of nanomaterials and surfactants for the preparation of graphene nanofluid: A review

Alexander, Kevin; Gajghate, Sameer Sheshrao; Katarkar, Anil S.; Majumder, Abhik; Bhaumik, Swapan

doi:10.1016/j.matpr.2020.11.231

Cited by 15 publications

(9 citation statements)

References 57 publications

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“…The hydrophobic groups of PVP tended to escape from the aqueous environment and form an inner core by self-polymerization inside the solution. In contrast, hydrophilic groups faced outward to form a shell in contact with water and formed a gel cluster [ 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Optimization of Graphene Nanoplatelets Dispersion and Its Performance in Cement Mortars

Zhou¹,

Wang

Gao

et al. 2022

Materials

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As promising next-generation conducting materials, Graphene Nanoplatelets (GNPs) have been widely used to enhance the mechanical and pressure-sensitive properties of cement-based materials. However, this beneficial effect highly depended on its dispersion. In this study, polyvinyl pyrrolidone (PVP) surfactant, high-speed shear, and ultrasonication were used to disperse GNPs. To fully exert the mechanical and pressure-sensitive properties and enhance the dispersion effect of GNPs in cement-based materials, the dispersing method parameters, including PVP concentration, ultrasonication time, shear time, and rate, were optimized. The dispersion degree of GNPs was evaluated by absorbance. The results show that the optimal dispersion parameters were 10 mg/mL of PVP concentration, 15 min of ultrasonication time, 15 min of shear time, and 8000 revolutions per minute (rpm) of shear rate. In addition, the effect of GNPs dosage (0.05, 0.1, 0.3, 0.5, 0.7, and 1.0 wt%) on the setting time, flowability, and mechanical and pressure-sensitive properties of cement mortar were examined. Results reveal that the optimum dosage of GNPs was found at 1.0 wt%.

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Section: Resultsmentioning

confidence: 99%

Optimization of Graphene Nanoplatelets Dispersion and Its Performance in Cement Mortars

Zhou¹,

Wang

Gao

et al. 2022

Materials

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“…Surfactants can also change the surface properties of nanocarriers, such as their morphology, magnetic properties, dispersion, and catalytic performances ( Asghar et al, 2016 ; Wei et al, 2018 ; Lopes et al, 2019 ; Alexander et al, 2020 ). This modification may result in a new structure with new surface activity due to the combination of hydrophilic groups of surfactants and surface groups of nanocarriers.…”

Section: Effects Of Surfactants On Nanocarriersmentioning

confidence: 99%

“…Therefore, the MBGs method has unique advantages of improving the chemical stability of immobilized enzymes and maintaining high catalytic activity ( Pavlidis et al, 2010 ; Itabaiana et al, 2014 ). It is clearly that the surfactants play an important role in the preparation of nanomaterials ( Lou et al, 2017 ; Bao et al, 2019 ; Ortiz-Martínez et al, 2019 ; Alexander et al, 2020 ).…”

Section: Introductionmentioning

confidence: 99%

Roles of Surfactants in Oriented Immobilization of Cellulase on Nanocarriers and Multiphase Hydrolysis System

et al. 2022

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Surfactants, especially non-ionic surfactants, play an important role in the preparation of nanocarriers and can also promote the enzymatic hydrolysis of lignocellulose. A broad overview of the current status of surfactants on the immobilization of cellulase is provided in this review. In addition, the restricting factors in cellulase immobilization in the complex multiphase hydrolysis system are discussed, including the carrier structure characteristics, solid-solid contact obstacles, external diffusion resistance, limited recycling frequency, and nonproductive combination of enzyme active centers. Furthermore, promising prospects of cellulase-oriented immobilization are proposed, including the hydrophilic-hydrophobic interaction of surfactants and cellulase in the oil-water reaction system, the reversed micelle system of surfactants, and the possible oriented immobilization mechanism.

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“…23 To obtain a stable dispersion of graphene structures in the base fluid (EG/H 2 O), without losing their good thermal property, the chemical modification of the hydrophobic surface of graphene becomes mandatory. 20,24,25 The use of surfactants can lead to stable dispersions but it decreases the overall thermal conductivity of the fluid. 26,27 The originality of this contribution lies in the use of surface-functionalized GNPs, [28][29][30][31][32][33][34] displaying a multilayer structure with less than 20 graphene layers stacked together, instead of using surfactants or full exfoliation of graphene oxide.…”

Section: Introductionmentioning

confidence: 99%

“…by dispersing 5 vol% of graphene in EG as the host fluid 23 . To obtain a stable dispersion of graphene structures in the base fluid (EG/H 2 O), without losing their good thermal property, the chemical modification of the hydrophobic surface of graphene becomes mandatory 20,24,25 . The use of surfactants can lead to stable dispersions but it decreases the overall thermal conductivity of the fluid 26,27 …”

Section: Introductionmentioning

confidence: 99%

Functionalized few‐layered graphene nanoplatelets for superior thermal management in heat transfer nanofluids

Wilhelm

Ludwig

Fischer

et al. 2021

Int J Applied Ceramic Tech

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The superior thermal conductivity and lightweight of graphene flakes make them materials of choice for advanced heat transfer applications, especially for transport of electricity from sustainable power stations such as concentrating solar power plants. In view of the excellent thermal conductivity of graphene or graphene-like nanomaterials (3000-5000 W m −1 K −1 ), their dispersion into conventional host fluids such as water (0.613 W m −1 K −1 ) or ethylene glycol (0.25 W m −1 K −1 ) can significantly improve fluid heat transfer characteristics.The two-dimensional structure and high surface area as well as the cost-efficient carbon-based material make graphene nanoplatelets (GNPs) suitable for largescale applications in colloidal thermal conductive fluids. For an efficient dispersion of GNPs in base fluids, intrinsically hydrophobic GNPs were acid treated to obtain highly concentrated (4 wt.%) graphene-based nanofluids. Investigations on various GNP sizes and reaction parameters showed significant influences on the resulting thermal conductivity values of the nanofluid. After 14 h measurements in a dormant system, the most efficient nanofluid reached a thermal conductivity of 0.586 W m −1 K −1 (the base fluid of 0.391 W m −1 K −1 ) and a low viscosity of 6.39 cP resulting in an overall efficiency improvement of 77%, when compared to the base fluid without particles.

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Role of nanomaterials and surfactants for the preparation of graphene nanofluid: A review

Cited by 15 publications

References 57 publications

Optimization of Graphene Nanoplatelets Dispersion and Its Performance in Cement Mortars

Optimization of Graphene Nanoplatelets Dispersion and Its Performance in Cement Mortars

Roles of Surfactants in Oriented Immobilization of Cellulase on Nanocarriers and Multiphase Hydrolysis System

Functionalized few‐layered graphene nanoplatelets for superior thermal management in heat transfer nanofluids

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