Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces

Friction measurements were carried out for a poly(dimethylsiloxane) (PDMS) melt (Mw ≈ 80000) confined between hydrophobic surfaces using the surface forces apparatus. The PDMS films were prepared by two different procedures: i) compression of a droplet into a hard-wall state (compressed sy...

Description complète

Enregistré dans:

Détails bibliographiques
Auteur principal:	Shinji Yamada
Format:	article
Langue:	EN
Publié:	Japanese Society of Tribologists 2006
Sujets:	surface forces apparatus nanotribology confinement poly(dimethylsiloxane) molecular layering squeeze flow Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
Accès en ligne:	https://doaj.org/article/23d5dba473a24084aee54ac29fb6e48e
Tags:	Ajouter un tag Pas de tags, Soyez le premier à ajouter un tag!

id	oai:doaj.org-article:23d5dba473a24084aee54ac29fb6e48e
record_format	dspace
spelling	oai:doaj.org-article:23d5dba473a24084aee54ac29fb6e48e2021-11-05T09:30:22ZNanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces1881-219810.2474/trol.1.29https://doaj.org/article/23d5dba473a24084aee54ac29fb6e48e2006-10-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/1/2/1_2_29/_pdf/-char/enhttps://doaj.org/toc/1881-2198Friction measurements were carried out for a poly(dimethylsiloxane) (PDMS) melt (Mw ≈ 80000) confined between hydrophobic surfaces using the surface forces apparatus. The PDMS films were prepared by two different procedures: i) compression of a droplet into a hard-wall state (compressed system); ii) adhesive contact of two thin films cast on each substrate from solution (cast system). The dynamic thicknesses were 1.4 nm for the compressed system and 2.0 nm for the cast system. Despite the large thickness, the friction of the cast system was larger than that of the compressed system. Large thicknesses generally give low friction; the unusual result suggests that the confined structures may be different between the two systems. The PDMS molecules in both systems lay parallel to surfaces, but the extent of ordering could be much higher for the compressed system. The compressed film has a layer structure and slipping mainly occurs between the layers, resulting in the low friction. On the contrary, the cast system should have a disordered structure; molecules may interdigitate to each other and possibly form bridges across the sliding surfaces, which could induce large friction. The effect of film the preparation procedures on molecular ordering is discussed.Shinji YamadaJapanese Society of Tribologistsarticlesurface forces apparatusnanotribologyconfinementpoly(dimethylsiloxane)molecular layeringsqueeze flowPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 1, Iss 2, Pp 29-33 (2006)
institution	DOAJ
collection	DOAJ
language	EN
topic	surface forces apparatus nanotribology confinement poly(dimethylsiloxane) molecular layering squeeze flow Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999
spellingShingle	surface forces apparatus nanotribology confinement poly(dimethylsiloxane) molecular layering squeeze flow Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Shinji Yamada Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces
description	Friction measurements were carried out for a poly(dimethylsiloxane) (PDMS) melt (Mw ≈ 80000) confined between hydrophobic surfaces using the surface forces apparatus. The PDMS films were prepared by two different procedures: i) compression of a droplet into a hard-wall state (compressed system); ii) adhesive contact of two thin films cast on each substrate from solution (cast system). The dynamic thicknesses were 1.4 nm for the compressed system and 2.0 nm for the cast system. Despite the large thickness, the friction of the cast system was larger than that of the compressed system. Large thicknesses generally give low friction; the unusual result suggests that the confined structures may be different between the two systems. The PDMS molecules in both systems lay parallel to surfaces, but the extent of ordering could be much higher for the compressed system. The compressed film has a layer structure and slipping mainly occurs between the layers, resulting in the low friction. On the contrary, the cast system should have a disordered structure; molecules may interdigitate to each other and possibly form bridges across the sliding surfaces, which could induce large friction. The effect of film the preparation procedures on molecular ordering is discussed.
format	article
author	Shinji Yamada
author_facet	Shinji Yamada
author_sort	Shinji Yamada
title	Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces
title_short	Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces
title_full	Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces
title_fullStr	Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces
title_full_unstemmed	Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces
title_sort	nanotribology of poly(dimethylsiloxane) melt confined between hydrophobic surfaces
publisher	Japanese Society of Tribologists
publishDate	2006
url	https://doaj.org/article/23d5dba473a24084aee54ac29fb6e48e
work_keys_str_mv	AT shinjiyamada nanotribologyofpolydimethylsiloxanemeltconfinedbetweenhydrophobicsurfaces
_version_	1718444275533873152

Nanotribology of Poly(dimethylsiloxane) Melt Confined between Hydrophobic Surfaces

Documents similaires