Tribological behavior of self-assembled double layer measured by a pin-on-plate method

Nakano, Miki; Ishida, Takao; Numata, Toshimitsu; Ando, Yasuhisa; Sasaki, Shinya

doi:10.1016/j.apsusc.2004.08.023

Cited by 9 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, bare Si is a very poor tribological material as it shows high friction, high adhesion and high wear [ 43 ]. To improve the tribological performance of Si, researchers have taken up many approaches, such as developing molecular lubricants and depositing ultra-thin films/coatings [ 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 ]. Even though most of these developed coatings show low coefficients of friction, they still suffer from the problem of high wear.…”

Section: Uhmwpe Coatings For Different Applicationsmentioning

confidence: 99%

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

Samad

2021

Polymers

View full text Add to dashboard Cite

In the recent past, polymer coatings have gained the attention of many researchers due to their low cost, their ability to be coated easily on different substrates, low friction and good anti-corrosion properties. Various polymers such as polytetrafluroethylene (PTFE), polyether ether ketone (PEEK), polymethylmethacrylate (PMMA), polyurethane (PU), polyamide (PA), epoxy and ultra-high molecular weight polytheylene (UHMWPE) have been used to develop these coatings to modify the surfaces of different components to protect them from wear and corrosion. However, among all these polymers, UHMWPE stands out as a tribologist’s polymer due to its low friction and high wear resistance. These coatings have found their way into applications ranging from microelectro mechanical systems (MEMS) to demanding tribological applications such as bearings and biomedical applications. Despite its excellent tribological properties, UHMWPE suffers from limitations such as low load bearing capacity and low thermal stability. To overcome these challenges researchers have developed various routes such as developing UHMWPE composite and hybrid composite coatings with several types of nano/micro fillers, developing composite films system and developing dual film systems. The present paper is an effort to summarize these various routes adopted by different researchers to improve the tribological performance of UHMWPE coatings.

show abstract

Section: Uhmwpe Coatings For Different Applicationsmentioning

confidence: 99%

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

Samad

2021

Polymers

View full text Add to dashboard Cite

show abstract

“…Organic ultra-thin films [such as self-assembled monolayers (SAMs) or polymer films] have shown good improvement in reducing the coefficient of friction, adhesive forces, and wear. [1][2][3][4][5] Further developments in improving the lubrication properties of the Si surface (especially wear durability) are needed so that many novel and reliable microcomponents can be developed/produced from Si. In our recent studies, we have identified that thermoplastic polymers which have linear microstructure 2 and with the addition of nano-filler materials 6 show excellent tribological properties (low friction and low wear) when they are coated onto Si.…”

Section: Introductionmentioning

confidence: 99%

Highly wear resistant chemisorbed polar ultra-high-molecular-weight polyethylene thin film on Si surface for micro-system applications

2009

View full text Add to dashboard Cite

We report deposition and tribological studies of a chemisorbed UHMWPE (ultra-high-molecular-weight polyethylene) film on an Si surface. UHMWPE molecules containing carboxyl and hydroxyl chemical groups were chemisorbed onto an Si surface using an intermediate GPTMS SAM (glycidoxypropyltrimethoxy silane self-assembled monolayer) layer. The carboxyl and hydroxyl groups of UHMWPE molecules react with the terminal epoxy groups of GPTMS SAM during chemisorption. The resultant film ($1.4 mm thick) has shown low coefficient of friction ($0.1) and high wear life (exceeding 100,000 cycles) in a sliding test against a 4 mm diameter Si 3 N 4 ball at a normal load of 0.3 N and a sliding velocity of 0.042 m/s measured on a micro-tribometer. In contrast, bare Si or GPTMS SAM modified Si has shown a higher coefficient of friction and failed within a few tens of sliding cycles. The high wear durability of the chemisorbed polymer film is attributed to the excellent adhesion of the UHMWPE film with the substrate due to chemisorption and to the good lubrication properties of UHMWPE molecules. This wear resistant film has potential applications in micro-electro-mechanical systems made of Si.

show abstract

“…We think this double-unit structure affects the tribological properties. In our previous study we reported that the double layer of the SAMs lowered their friction coefficients [15]. In that study, the topmost and lower layers acted as mobile and bound layers, respectively.…”

Section: The Effects Of Molecules Upon the Friction Propertiesmentioning

confidence: 99%

“…Another reason is that the SAM formation process on Au substrates is easier than that on other substrates such as silicon made from organosilianol compounds. For example, the authors have investigated the tribological behavior of organosulfur molecule SAMs on Au using a pin-on-plate method [13][14][15]. In our previous study, we found that the friction coefficients were dependent on the alkyl chain length and that even a monolayer film was sufficiently durable against friction, although the friction coefficients were slightly high at 0.2 to 0.4.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Structure on the Tribological Properties of Organic Self-Assembled Molecular Layers

Nakano

Miyake

2013

Tribology Online

Self Cite

View full text Add to dashboard Cite

The tribological properties of self-assembled monolayers (SAMs) on Au were investigated with a focus on the effects of the structure and end groups of the molecules upon the frictional properties of the modified surfaces of the SAMs. Three kinds of organothiols were used: HS-(CH 2 ) 11 -(O-CH 2 -CH 2 ) 3 -OCH 3 : EG3OMe, CH 2 -(CH 2 ) 15 -SH: HDT, and OH-(CH 2 ) 16 -SH: HDTOH. The SAM surfaces were characterized by contact angle measurements of pure water, X-ray photoelectron spectroscopy, and infrared reflection absorption spectroscopy. The frictional properties were examined using a pin-on-plate tribometer. The friction coefficients of the SAM surfaces were similar to the bare Au surface in the high normal load region. In the low normal load region, HDT SAMs exhibited lower friction coefficients than HDTOH SAMs. The end groups affected the friction coefficients for the same chain structures. The friction coefficients of the EG3OMe SAMs were lower than those of HDT SAMs. The HDT SAMs were thought to have well-organized structures. On the other hand, the EG3OMe SAMs probably had more flexible structures than the HDT SAMs because of their ethylene glycol chains, indicating that the chain structures as well as the end groups affected the friction coefficients of the SAMs.

show abstract

Tribological behavior of self-assembled double layer measured by a pin-on-plate method

Cited by 9 publications

References 23 publications

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

Recent Advances in UHMWPE/UHMWPE Nanocomposite/UHMWPE Hybrid Nanocomposite Polymer Coatings for Tribological Applications: A Comprehensive Review

Highly wear resistant chemisorbed polar ultra-high-molecular-weight polyethylene thin film on Si surface for micro-system applications

Effects of Structure on the Tribological Properties of Organic Self-Assembled Molecular Layers

Contact Info

Product

Resources

About