Investigation of Electrical Contact Resistance of Ag Nanoparticles as Additives Added to PEG 300

The electrical contact resistance (ECR) measuring techniques were applied to study the deposit film forming process in the presence of Ag nanoparticles under boundary lubricating condition (abbreviated as NA) and the tribological performance of polyethylene glycol (PEG 300) containing different concentration of Ag nanoparticles were also evaluated. ECR values between tribo-pairs lubricated with PEG 300 containing Ag nanoparticles and blank PEG 300, which was used as a comparison, were detected on a reciprocating “ball-on-disk” mode wear tester and boundary lubricating conditions can be achieved. A series of tests were performed to investigate the effect of rubbing conditions such as normal load, frequency, and surface roughness on the ECR value. SEM and XPS were used to analyze the worn surface to confirm the results of ECR. Results showed that the use of the ECR measuring techniques permits visualization and synchronous study of deposit film formation. Variations in test conditions can only slightly affect the ECR lubricated with PEG 300 containing Ag nanoparticles but affect the ECR lubricated with blank PEG 300 significantly. It is realized that the anti-wear property is related to the formation of a deposited film of Ag nanoparticles.

[1]  H. Czichos,et al.  Rapid measuring techniques for electrical contact resistance applied to lubricant additives studies , 1976 .

[2]  Wei-min Liu,et al.  Study on an antiwear and extreme pressure additive of surface coated LaF3 nanoparticles in liquid paraffin , 2001 .

[3]  J. Georges,et al.  Boundary lubrication with anti-wear additives: study of interface film formation by electrical contact resistance , 1979 .

[4]  J. M. Martín,et al.  Chemical analysis of overbased calcium sulfonate detergents by coupling XPS, ToF-SIMS, XANES, and EFTEM , 2004 .

[5]  Qunji Xue,et al.  Friction and wear properties of a surface-modified TiO2 nanoparticle as an additive in liquid paraffin , 1997 .

[6]  Cheng Xian-hua,et al.  On the friction and wear behavior of PTFE composite filled with rare earths treated carbon fibers under oil-lubricated condition , 2006 .

[7]  Stephen M. Hsu,et al.  Nano-lubrication: concept and design , 2004 .

[8]  M. Albrecht,et al.  Plasma resonance enhancement of Raman scattering by pyridine adsorbed on silver or gold sol particles of size comparable to the excitation wavelength , 1979 .

[9]  Z. Zhang,et al.  Synthesis and Characterization of a Molybdenum Disulfide Nanocluster , 1994 .

[10]  R. Tenne,et al.  Mechanisms of ultra-low friction by hollow inorganic fullerene-like MoS2 nanoparticles , 2002 .

[11]  S. Efrima,et al.  Silver Nanoparticles Capped by Long-Chain Unsaturated Carboxylates , 1999 .

[12]  Q. Xue,et al.  Friction and wear behaviors of the complexes of rare earth hexadecylate as grease additive , 1998 .

[13]  Wei-min Liu,et al.  PREPARATION AND CHARACTERIZATION OF SURFACE-COATED ZNS NANOPARTICLES , 1999 .

[14]  Y. Lin,et al.  Antiwear mechanism of zinc dialkyl dithiophosphates added to a paraffinic oil in the boundary lubrication condition , 1993 .

[15]  Jingfang Zhou,et al.  Tribological behavior and lubricating mechanism of Cu nanoparticles in oil , 2000 .

[16]  Feng Zhou,et al.  Electrodeposition and characterization of Ni–Co–carbon nanotubes composite coatings , 2006 .

[17]  J. M. Martín,et al.  A multi-technique approach of tribofilm characterisation , 2004 .

[18]  D. Vrbanic,et al.  Tribological performances of Mo6S3I6 nanowires , 2007 .

[19]  Wenpeng Liu,et al.  Tribochemistry and antiwear mechanism of organic–inorganic nanoparticles as lubricant additives , 2006 .