TY - JOUR
T1 - Load-Induced Frictional Transition at a Well-Defined Alkane Loop Surface
AU - Shundo, Atsuomi
AU - Hori, Koichiro
AU - Tezuka, Yasuyuki
AU - Yamamoto, Takuya
AU - Tanaka, Keiji
N1 - Funding Information:
We are grateful for synthesis of 1,2-dithiacycloeicosane by Mr. Yu Kitazawa and Mr. Yukihiro Tada of Tokyo Institute of Technology and for helpful discussion with Dr. Yoshihisa Fujii of Mie University. This research was partly supported by JSPS KAKENHI for Young Scientists (A) (no. 15H05496) (A.S.), for Innovative Areas "New Polymeric Materials Based on Element-Blocks" (no. 2401) (15H00758) (K.T.) for "Innovative Materials Engineering Based on Biological Diversity"(no. 15H01595) (T.Y.) and for Scientific Research (A) (no. 15H02183) (K.T.). We are also grateful for support from JST SENTANKEISOKU (13A0004) (K.T.), from MEXT Photon and Quantum Basic Research Coordinated Development Program (K.T.), and from CSTI Impulsing Paradigm Change through Disruptive Technologies (ImPACT) Program (K.T.).
Publisher Copyright:
© 2016 American Chemical Society.
Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 2017/3/7
Y1 - 2017/3/7
N2 - Self-assembled monolayers (SAMs) have attracted considerable attention as a tool to confer desirable properties on material surfaces. So far, molecules used for the SAM formation are generally limited to linear ones and thus chain ends dominate the surface properties. In this study, we have successfully demonstrated unique frictional properties of a SAM composed of alkane loops from cyclic alkanedisulfide on a gold substrate, where both sulfurs are bound to gold. The frictional response was proportional to the load. However, once the load went beyond a threshold value, the frictional response became more dominant. Such a frictional transition was reversible and repeatable and was not discerned for a corresponding SAM composed of n-alkyl chains. The load-induced change in the frictional response from the alkane loops could be associated with the conformational change of the alkane loops. The present results differ from most studies, in which the surface properties are designed on the basis of functional chain end groups.
AB - Self-assembled monolayers (SAMs) have attracted considerable attention as a tool to confer desirable properties on material surfaces. So far, molecules used for the SAM formation are generally limited to linear ones and thus chain ends dominate the surface properties. In this study, we have successfully demonstrated unique frictional properties of a SAM composed of alkane loops from cyclic alkanedisulfide on a gold substrate, where both sulfurs are bound to gold. The frictional response was proportional to the load. However, once the load went beyond a threshold value, the frictional response became more dominant. Such a frictional transition was reversible and repeatable and was not discerned for a corresponding SAM composed of n-alkyl chains. The load-induced change in the frictional response from the alkane loops could be associated with the conformational change of the alkane loops. The present results differ from most studies, in which the surface properties are designed on the basis of functional chain end groups.
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U2 - 10.1021/acs.langmuir.6b04042
DO - 10.1021/acs.langmuir.6b04042
M3 - Article
C2 - 27998061
AN - SCOPUS:85014803117
SN - 0743-7463
VL - 33
SP - 2396
EP - 2401
JO - Langmuir
JF - Langmuir
IS - 9
ER -