TY - JOUR
T1 - Surface forces between mica surfaces confining inorganic nanoparticle dispersions and frictional properties
AU - Joksimovic, Rastko
AU - Mizukami, Masashi
AU - Hojo, Daisuke
AU - Adschiri, Tadafumi
AU - Kurihara, Kazue
N1 - Funding Information:
We acknowledge the contribution of Dr. S. Fuji and Dr. H. Matsubara who conceived the analysis procedure to extract surface curves from raw video files. We also thank Dr. K. Inomata for her assistance during the AFM experiments. This research was supported by the WPI program of the Japanese Ministry of Education, Culture, Sports, Science and Technology (MEXT) , and by “Green Tribology Innovation Network” Advanced Environmental Materials Area, Green Network of Excellence (GRENE) program by the MEXT.
Publisher Copyright:
© 2014 Elsevier B.V.
PY - 2014/12/5
Y1 - 2014/12/5
N2 - The normal forces between mica surfaces confining dispersions of ceria (CeO2) nanoparticles in decalin were measured using the surface forces apparatus. The nanoparticles (size ca. 6nm), synthesized under supercritical conditions in a cubic shape, were coated with decanoic acid. A repulsion force appeared at a distance of 50-80nm for the first compression, whereas the range was reduced in the subsequent approaches. This indicated that the nanoparticles were rearranged on the mica surface by compression from a disordered initial adsorption pattern. Resonance shear measurements were applied for the first time to a nanoparticle dispersion. The confined particle layers were shown to significantly reduce the friction compared to the mica-mica contact. Those results should contribute to the understanding of the assembly of nanoparticles into thin films under confinement and to the implementation of nanomaterials in tribological applications.
AB - The normal forces between mica surfaces confining dispersions of ceria (CeO2) nanoparticles in decalin were measured using the surface forces apparatus. The nanoparticles (size ca. 6nm), synthesized under supercritical conditions in a cubic shape, were coated with decanoic acid. A repulsion force appeared at a distance of 50-80nm for the first compression, whereas the range was reduced in the subsequent approaches. This indicated that the nanoparticles were rearranged on the mica surface by compression from a disordered initial adsorption pattern. Resonance shear measurements were applied for the first time to a nanoparticle dispersion. The confined particle layers were shown to significantly reduce the friction compared to the mica-mica contact. Those results should contribute to the understanding of the assembly of nanoparticles into thin films under confinement and to the implementation of nanomaterials in tribological applications.
KW - Ceria nanoparticles
KW - Nanotribology
KW - Resonance shear measurements
KW - Surface forces apparatus
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U2 - 10.1016/j.colsurfa.2014.09.002
DO - 10.1016/j.colsurfa.2014.09.002
M3 - Article
AN - SCOPUS:84907835082
SN - 0927-7757
VL - 463
SP - 70
EP - 77
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
ER -