Structural aging and stiction dynamics in confined liquid films

The Journal of Chemical Physics
Shinji Yamada

Abstract

The static friction (stiction) of the molecularly thin films of an irregularly shaped molecule 1,3-dimethylbutyl octyl ether (DBOE) confined between mica surfaces was investigated using the surface forces apparatus. Stop-start experiments were carried out and the stiction spike was measured as a function of surface stopping (aging) time t and applied pressure P. The results show two relaxation processes, one on stopping and one on starting, where each process has a fast and a slow time constant. For stopping mode, there is no stiction spike when t is shorter than a characteristic nucleation time, tau(n) (fast time constant). When t exceeds tau(n), stiction spike appears whose height increases logarithmically with t. With regard to starting, the relaxation behavior was evaluated by a double exponential fit of the slipping regime (force decay) of the spike and two time constants (tau(1) and tau(2)) were obtained. The fast time constant on starting tau(1) is almost equal to that on stopping tau(n). To the best of our knowledge, this is the first direct observation of the agreement of the time constant on stopping and that on starting, indicative of a reversible structural transition (solid-liquid transition) in the stop-start stic...Continue Reading

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Citations

Nov 28, 2012·The Journal of Chemical Physics·Shinji Yamada
Oct 20, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Shinji YamadaKazue Kurihara
Oct 28, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Takumi MiyamotoShinji Yamada

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Methods Mentioned

BETA
forces measurements
fluorescence

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