Ni nanodot-patterned surfaces for adhesion and friction reduction

Zou, Min; Wang, Hengyu; Larson, Preston R.; Hobbs, K. L.; Johnson, Matthew B.; Awitor, Komla Oscar

doi:10.1007/s11249-006-9157-x

Cited by 29 publications

(17 citation statements)

References 29 publications

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“…Jia et al [21] found that the friction force varied nonlinearly with the applied normal load for polystyrene microsphere-patterned surfaces. Zou et al [22] confirmed the nonlinear dependence of the friction force on the load for a Ni nanodot-patterned contact surface and found that the friction force-load curves could be accurately fitted using the DMT contact model. Moreover, compared to a smooth silicon surface, the nanopatterned surfaces also showed remarkable adhesion and friction reduction.…”

Section: Introductionmentioning

confidence: 87%

Tuning the Friction of Silicon Surfaces Using Nanopatterns at the Nanoscale

Han

Sun

et al. 2017

Coatings

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Friction and wear become significant at small scale lengths, particularly in MEMS/NEMS. Nanopatterns are regarded as a potential approach to solve these problems. In this paper, we investigated the friction behavior of nanopatterned silicon surfaces with a periodical rectangular groove array in dry and wear-less single-asperity contact at the nanoscale using molecular dynamics simulations. The synchronous and periodic oscillations of the normal load and friction force with the sliding distance were determined at frequencies defined by the nanopattern period. The linear load dependence of the friction force is always observed for the nanopatterned surface and is independent of the nanopattern geometry. We show that the linear friction law is a formal Amontons' friction law, while the significant linear dependence of the friction force-versus-real contact area and real contact area-versus-normal load captures the general features of the nanoscale friction for the nanopatterned surface. Interestingly, the nanopattern increases the friction force at the nanoscale, and the desired friction reduction is also observed. The enlargement and reduction of the friction critically depended on the nanopattern period rather than the area ratio. Our simulation results reveal that the nanopattern can modulate the friction behavior at the nanoscale from the friction signal to the friction law and to the value of the friction force. Thus, elaborate nanopatterning is an effective strategy for tuning the friction behavior at the nanoscale.

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Section: Introductionmentioning

confidence: 87%

Tuning the Friction of Silicon Surfaces Using Nanopatterns at the Nanoscale

Han

Sun

et al. 2017

Coatings

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“…The applicability of the continuum contact mechanics model to the nanoscale multi-asperity contact between a 100-lm diamond tip and the Ni NDPS has been previously observed [5]. The elastic contact model applies to each Ni dot/tip interface if the contact interface materials are homogeneous and only elastic deformation occurs.…”

Section: Frictional Behavior Of the Ndpsmentioning

confidence: 97%

“…The Ni NDPS was fabricated by thermal evaporation of Ni through a porous anodic aluminum oxide (AAO) template onto a Si substrate, as described in detail elsewhere [5]. The resulting pattern, which was roughly 3 mm · 3 mm in size, consisted of a well-ordered hexagonal array of 75 nm tall conical shaped Ni dots approximately 75 nm in diameter at the base with a dot-to-dot separation of 100 nm.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In regime V, the Ni nanodots were completely removed from the substrates, and caused the COF to increase suddenly and behaved erratically afterward. The friction versus load relationship between a 100 lm tip and the Ni NDPS obtained from a previous study [5] was also plotted in Fig. 3 for comparison.…”

Section: Frictional Behavior Of the Ndpsmentioning

confidence: 99%

“…Recently, surface nano-patterning with Ni nanodot arrays on a Si substrate was investigated for adhesion and friction reduction of contacting interfaces for potential tribological applications in miniaturized systems [5]. The results showed that the adhesion forces and the coefficients of friction (COF) between a 100 lm diamond tip and the Ni nanodot-patterned surface (NDPS) were reduced up to 92% and 83%, respectively, compared to those of a smooth silicon surface.…”

Section: Introductionmentioning

confidence: 99%

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Friction Study of a Ni Nanodot-patterned Surface

et al. 2007

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Nanoscale frictional behavior of a Ni nanodotpatterned surface (NDPS) was studied using a TriboIndenter by employing a diamond tip with a 1 lm nominal radius of curvature. The Ni NDPS was fabricated by thermal evaporation of Ni through a porous anodized aluminum oxide (AAO) template onto a Si substrate. Surface morphology and the deformation of the NDPS were characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM), before and after friction/ scratch testing. SEM images after scratching clearly showed that, similar to what was assumed at the macroscale, the frictional force is proportional to the real area of contact at the nanoscale. It was found that adhesion played a major role in the frictional performance, when the normal load was less than 20 lN and plastic deformation was the dominant contributor to the frictional force, when the normal load was between 60 lN and 125 lN. Surprisingly, a continuum contact mechanics model was found to be applicable to the nanoscale contact between the tip and the inhomogeneous Ni NDPS at low loads. The coefficient of friction (COF) was also found to depend on the size of the tip and was four times the COF between a 100 lm tip and the Ni NDPS. Finally, the critical shear strength of the Ni nanodots/Si substrate interface was estimated to be about 1.24 GPa.

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Adhesion and friction studies of Au nanoparticle‐textured surfaces with colloidal tips

Zhang

Zhong

et al. 2011

Surface & Interface Analysis

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Surface roughness plays an important role in affecting the adhesive force and friction force in microelectromechanical systems (MEMS)/nanoelectromechanical systems (NEMS). One effective approach of reducing adhesion and friction of contacting interfaces is to create textured surface, which is especially beneficial for MEMS'/NEMS' production yield and product reliability. In this article, we present a convenient method to fabricate the nano-textured surfaces by self-assembling Au nanoparticles (NPs) on the silicon (100) surfaces. The nanoparticle-textured surfaces (NPTS) with different packing density and texture height were prepared by controlling the assembling time and the size of Au NPs. The morphologies and chemical states of NPTS were characterized by atomic force microscope (AFM), field emission scanning electron microscope, and XPS. The adhesion and friction on the NPTS were studied by AFM with colloidal tip. The results show that the nano-textured surfaces have effectively reduced adhesive force and friction force compared with the 3-aminopropyl trimethoxysilane self-assembled monolayer surfaces. The lowered adhesion and friction were attributed to the reduced real area of contact between NPTS and colloidal tip. The adhesion and friction of the NPTS are varying with the texture packing density and dependent on both the texture height and asperities spacing, which are related to the size and coverage ratio of NPs on surfaces.

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Ni nanodot-patterned surfaces for adhesion and friction reduction

Cited by 29 publications

References 29 publications

Tuning the Friction of Silicon Surfaces Using Nanopatterns at the Nanoscale

Tuning the Friction of Silicon Surfaces Using Nanopatterns at the Nanoscale

Friction Study of a Ni Nanodot-patterned Surface

Adhesion and friction studies of Au nanoparticle‐textured surfaces with colloidal tips

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