Sessile droplet contact angle of water–Al 2 O 3 , water–TiO 2 and water–Cu nanofluids

Cieśliński, Janusz T.; Krygier, Katarzyna

doi:10.1016/j.expthermflusci.2014.06.004

Cited by 52 publications

(19 citation statements)

References 15 publications

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“…As observed in our study, the sedimentation rate of the nanofluid systems strongly supports the previously established association of the nanoaggregate size with that of the sedimentation rate (Cieslinski and Krygier 2014). In our study, a settling of the NPs from the solutions to almost half their initial concentration was observed after a 30 min period.…”

Section: Heavy Crude Oilsupporting

confidence: 73%

“…The surfactant in turn affected the interactions between the nanoparticles by increasing repulsion forces between the SiO 2 NPs. The lack of surfactant at higher SiO 2 NPs concentrations indicates that the SiO 2 NPs produced larger SiO 2 nanoaggregates with larger-thansuitable diameters (Cieslinski and Krygier 2014;Ehtesabi et al 2014). The smaller diameters of nanoaggregates reported in previous findings were most likely the consequence of longer sonication times which yielded a more thorough mixture of the NPs into the suspension.…”

Section: Heavy Crude Oilmentioning

confidence: 65%

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Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

Bai

Korte

et al. 2017

Appl Nanosci

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Any efficient exploitation of new petroleum reservoirs necessitates developing methods to mobilize the crude oils from such reservoirs. Here silicon dioxide nanoparticles (SiO 2 NPs) were used to improve the efficiency of the chemical-enhanced oil recovery process that uses surfactant flooding. Specifically, SiO 2 NPs (i.e., 0, 0.001, 0.005, 0.01, 0.05, and 0.1 wt%) and Tween Ò 20, a nonionic surfactant, at 0, 0.5, and 2 critical micelle concentration (CMC) were varied to determine their effect on the stability of nanofluids and the interfacial tension (IFT) at the oil-aqueous interface for 5 wt% brine-surfactantSiO 2 nanofluid-oil systems for West Texas Intermediate light crude oil, Prudhoe Bay medium crude oil, and Lloydminster heavy crude oil. Our study demonstrates that SiO 2 NPs may either decrease, increase the IFT of the brinesurfactant-oil systems, or exhibit no effects at all. For the brine-surfactant-oil systems, the constituents of the oil and aqueous substances affected the IFT behavior, with the nanoparticles causing a contrast in IFT trends according to the type of crude oil. For the light oil system (0.5 and 2 CMC Tween threshold concentration resulted in a decrease in IFT, and concentrations above this threshold resulted in an increase in IFT. The IFT decreased until the NP concentration reached a threshold concentration where synergetic effects between nonionic surfactants and SiO 2 NPs are the opposite and result in antagonistic effects. Adsorption of both SiO 2 NPs and surfactants at an interface caused a synergistic effect and an increased reduction in IFT. The effectiveness of the brine-surfactant-SiO 2 nanofluids in decreasing the IFT between the oil-aqueous phase for the three tested crude oils were ranked as follows: (1) Prudhoe Bay [ (2) Lloydminster [ and (3) West Texas Intermediate. The level of asphaltenes and resins in these crude oil samples reflected these rankings. A decrease in the IFT also indicated the potential of the SiO 2 NPs to decrease capillary pressure and induce the movement and recovery of oil in original water-wet reservoirs. Conversely, an increase in IFT indicated the potential of SiO 2 NPs to increase capillary pressure and oil recovery in reservoirs subject to wettability reversal under water-wet conditions. Raspberrylike morphology particles were discovered in 5 wt% brinesurfactant-SiO 2 nanofluid-oil systems. The development of raspberry-like particles material with high surface area, high salt stability, and high capability of interfaces alteration and therefore wettability changes offers a wide range of applications in the fields of applied nanoscience, environmental engineering, and petroleum engineering.

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Section: Heavy Crude Oilsupporting

confidence: 73%

Section: Heavy Crude Oilmentioning

confidence: 65%

Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

Bai

Korte

et al. 2017

Appl Nanosci

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“…Generally, sessile drop method, 36,54,55) captive bubble method, 38,56,57) environmental scanning electron microscopy (ESEM) method 44,52,58,59) and gel trapping method 45,47) are direct methods. These methods obtain contact angles by observing the forming angles directly based on the theory of Young.…”

Section: Direct Methodsmentioning

confidence: 99%

“…As shown in Fig. 3, there are many measurement methods that have been developed for particles: sessile drop method, [31][32][33][34][35][36][37] captive bubble technique, [38][39][40] Wilhelmy plate, 41) capillary rise method, 42,43) and some other new measurements, [44][45][46][47] all of the above are briefly described below.…”

Section: Introductionmentioning

confidence: 99%

Measurement for Contact Angle of Iron Ore Particles and Water

Tang

et al. 2018

ISIJ Int.

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Contact angle, as a key index for the wettability of iron ore particles by water, is of very important for the iron ore processing like beneficiation, sintering and pelletizing.Methods developed for measuring the contact angles generally can be divided into direct and indirect methods, which were summarized in present study and their advantages and disadvantages are all compared. Capillary rise method may be the most applicative approach for porous particles.Most of the contact angles between iron ore particles with water reported in the literatures were collected and the influence of the physical and chemical properties of iron ore particles were analyzed. The result shows that iron ore particles are hydrophilic and its water contact angles are influenced by the complicate interaction of chemical compositions, especially the content of oxy-hydroxides and the surface morphology. Generally, the water contact angle of goethite is the smallest. Complicate surface morphology suggest a better wettability. Furthermore, the penetration behavior of natural iron ore particles and synthetic iron ore particles are obviously different during the contact angle measurement. Compared with sessile drop method, capillary rise methods are more suitable for the measurement of natural iron oxides. Some empirical equations to predict the contact angle were collected and compared. The wettability can be improved by increasing the surface morphology of particles, coating of iron ore particles, and hightemperature treatment.

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“…However, wettability is not only the one criterion for improvement in lubrication performance; it also depends on several factors. Of such are bonding between the nanoparticles, particlefluid interactions and low range electrostatic force of interactions between the nanoparticles that depend on nanoparticle concentration and size [25]. The contact angle of the base oil is recorded as (34.98°) which is much higher compared to hybrid nano cutting fluid.…”

Section: Coefficient Of Friction and Contact Anglementioning

confidence: 98%

Performance Evaluation of CNT/MoS2 Hybrid Nanofluid in Machining for Surface Roughness

Gugulothu

Krishna

2019

IJAME

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Present work is motivated by the high thermal conductivity of MWCNT and low coefficient of friction due to MoS2 nanoparticles which can significantly improve the heat transfer and lubrication performance of hybrid nanofluids than nanofluids. Hybrid nanofluids are prepared with CNT/MoS2 nanoparticles of 1wt% in sesame oil, neem oil and mahua oil by varying hybrid ratio (i.e. 1: 1; 1:2 and 2:1) and surfactant. The hybrid nanofluid composition is evaluated based on stability analysis from sedimentation and zeta potential studies. The concentration of nanoparticles is varied by preparing CNT/MoS2 hybrid nanofluid using obtained composition for stability and selected the optimal concentration for the lowest coefficient of friction obtained in friction test. The property of thermal conductivity is also evaluated for varying concentration of hybrid nanofluid at room temperature. The contact angle for CNT/MoS2 hybrid nanofluids is evaluated with a contact angle meter to understand the lubrication effect. Experimental findings for stable hybrid nanofluid are found to be sesame oil, SDS with 15% content of nanoparticle weight and 1:2 hybrid ratio. From friction test, it is observed that 2 wt%concentration is optimal for least coefficient of friction (0.038). Minimum surface roughness (Ra) is observed with 2 wt% of hybrid nanofluid compared to dry machining and conventional cutting fluid. Optimum conditions for minimum surface roughness are evaluated in turning of AISI1040 steel with the use of 2wt% of CNT/MoS2 hybrid nanofluid in RSM. Ra value is observed to decrease with an increase in cutting speed and increased with an increase in feed and depth of cut.

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Sessile droplet contact angle of water–Al 2 O 3 , water–TiO 2 and water–Cu nanofluids

Cited by 52 publications

References 15 publications

Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

Effects of silica-based nanostructures with raspberry-like morphology and surfactant on the interfacial behavior of light, medium, and heavy crude oils at oil-aqueous interfaces

Measurement for Contact Angle of Iron Ore Particles and Water

Performance Evaluation of CNT/MoS2 Hybrid Nanofluid in Machining for Surface Roughness

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