Enhanced tribo-chemical properties of oxygen functionalized mechanically exfoliated hexagonal boron nitride nanolubricant additives

Sahu, Jayakrushna; Panda, Kalpataru; Gupta, Bhavana; Kumar, N.; Manojkumar, P.; Kamruddin, M.

doi:10.1016/j.matchemphys.2017.12.050

Cited by 57 publications

(31 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure shows the crystal structure data of pristine h‐BN powders, as‐prepared h‐BNNSs, OH‐BNNSs, APTS‐BNNSs, and CPBA‐BNNSs. In Figure a, it is clearly indicated that the X‐ray diffraction (XRD) pattern of the h‐BN has six characteristic diffraction peaks at 26.9°, 41.6°, 43.8°, 50.2°, 55.2°, and 76.0°, and they are attributed to (002), (100), (101), (102), (004), and (110) planes of hexagonal crystal structure (JCPDS card 34‐0421), respectively . Compared with the pristine h‐BN, the as‐exfoliated h‐BNNSs and surface‐modified h‐BNNSs exhibit the similar characteristic diffraction peaks.…”

Section: Resultsmentioning

confidence: 99%

“…Owing to its large mechanical strength, high thermal stability, and remarkable oxidation resistance, h‐BN has been widely used in lubricant systems. In h‐BN, the weak van der Waals interaction between loosely stacked h‐BN sheets makes it easy to shear along the basal plane of its crystalline lamellar structure under the sliding stress, which promotes inter‐plane sliding . In addition, the h‐BN sheets easily enter and deposit on the surface of the contact areas during the rubbing process, which can avoid the direct contact of rubbing surfaces .…”

Section: Introductionmentioning

confidence: 99%

“…Tribological tests displayed that the modified h‐BN particles as additives of castor oil possessed high friction‐reducing and antiwear performances at different working conditions. However, the bulky size of h‐BN particles is a great obstacle which will restrict the potential of h‐BN for liquid lube application …”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Covalent Functionalized Boron Nitride Nanosheets as Efficient Lubricant Oil Additives

Wang

Han

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

Hexagonal boron nitride nanosheets (h‐BNNSs) are obtained by a chemical exfoliation method from bulk h‐BN powders. The surface of h‐BNNSs is functionalized with 3‐aminopropyltriethoxysilane (APTS). Further, the amino functional groups on the surface of APTS‐modified h‐BNNSs (APTS‐BNNSs) are reacted with 4‐carboxyphenylboronic acid (CPBA) to obtain the covalently linked CPBA‐BNNSs. The morphology and structure of h‐BNNSs, APTS‐BNNSs, and CPBA‐BNNSs are comprehensively discussed. Of all the above four additives, the CPBA‐BNNSs can most outstandingly improve friction‐reducing and antiwear capacities of 150N base oil. The CPBA‐BNNSs possess excellent dispersion stability in base oil due to the phenylboronic acid groups on the surface of h‐BNNSs. Only 0.075 wt% CPBA‐BNNSs is added into the base oil, the coefficient of friction is decreased by 32.3%, and the wear scar diameter and mean wear volume of the rubbing surface are reduced by 42.9% and 88.4%. The analysis of the worn scar surface demonstrates that CPBA‐BNNSs can form a protective tribofilm containing boron and nitrogen elements on the rubbing surfaces, thereby decreasing the friction and protecting the surfaces from wear. Thus, the CPBA‐BNNSs may be recommended as a potential lubricant additive in practical applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Covalent Functionalized Boron Nitride Nanosheets as Efficient Lubricant Oil Additives

Wang

Han

et al. 2019

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Moreover, recently reports reveals O doped BN material process an excellent ferromagnetic properties at room temperature, and other attracting properties. 15,16 So that, this properties suggest that O doped BNNT is likely to a very promising piezoelectric nanomaterial for a widely application.…”

Section: Introductionmentioning

confidence: 81%

Electrical properties of O-self-doped boron-nitride nanotubes and the piezoelectric effects of their freestanding network film

Ban

Wei

2018

RSC Adv.

View full text Add to dashboard Cite

Boron-nitride nanotubes (BNNTs) are a common one-dimensional (1D) nanostructure that possess piezoelectric potential due to ion-covalent boron-nitride (BN) bonding. Harnessing the advantages offered by high-stability BN structures, these materials have been used for various new applications such as nanogenerators, nanotransistors, and nano-artificial eardrums. In this paper, we used nano-iron oxide red as a catalyst and boron powder in an aqueous dispersion as the boron source to synthesize highpurity O-self-doped BNNTs and film. We investigated the electrical properties of O-self-doped BNNTs and the piezoelectricity of freestanding BNNT film and demonstrated that the electrical properties of O-self-doped BNNTs improved dramatically compared to those of non-doped BNNTs. We also analyzed the band gaps and density of states (DOS) of the O-self-doped BNNTs with the Spanish Initiative for Electronic Simulation with Thousands of Atoms (SIESTA) code to explain the improvement. In addition, we revealed the piezoelectric voltage coefficient g 31 of O-self-doped BNNTs (0.28 V m N À1 ) network films, which can guide future applications for vibration nanosensors and transducers under extreme conditions. † Electronic supplementary information (ESI) available. See

show abstract

“…Boron esters are used in modern formulations as an antioxidant additive or as replacement to ZDDP. Boron can also be used as a solid lubricant nano-additive to successfully reduce friction and wear in a sliding pair as discussed in [18], [19], [20] and [21]. In both cases the initial boron content of the lubricant will decrease with time as experienced.…”

Section: Discussionmentioning

confidence: 99%

Investigation of Used Engine Oil Lubricating Performance Through Oil Analysis and Friction and Wear Measurements

2019

View full text Add to dashboard Cite

Engine oil degradation during long-term engine operation is a wellresearched topic, however, the effect of biofuels and synthetic compounds is not fully understood. In order to characterise novel fuel related phenomena in an engine a basis of studies should be established with state-of-the-art engines and conventional fuels and lubricants. This study aims at describing the behaviour of used engine oils throughout their service life based on friction and wear measurements with oil samples from three identical light-duty direct injection supercharged diesel engines. Oil samples were taken from each engine every 50 hours between oil changes to determine physical properties and chemical composition. Friction and wear measurements were conducted on a high-frequency reciprocating rig. The results show strong correlation between oil service life and boron content, as well as acid number and base number. A similar correlation between coefficient of friction with used samples and boron content as well as soot content was observed. A simple model based on a polynomial fitting function was proposed to predict friction and wear from boron content, total acid number and total base number.

show abstract

Enhanced tribo-chemical properties of oxygen functionalized mechanically exfoliated hexagonal boron nitride nanolubricant additives

Cited by 57 publications

References 36 publications

Covalent Functionalized Boron Nitride Nanosheets as Efficient Lubricant Oil Additives

Covalent Functionalized Boron Nitride Nanosheets as Efficient Lubricant Oil Additives

Electrical properties of O-self-doped boron-nitride nanotubes and the piezoelectric effects of their freestanding network film

Investigation of Used Engine Oil Lubricating Performance Through Oil Analysis and Friction and Wear Measurements

Contact Info

Product

Resources

About