Advances in Chemical Physics 129 by Stuart A. Rice

By Stuart A. Rice

This sequence presents the chemical physics box with a discussion board for serious, authoritative reviews of advances in each region of the self-discipline. quantity 129 within the sequence keeps to document contemporary advances with major, updated chapters by way of the world over well-known researchers.

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The Spreading Process. After the system is relaxed, spreading commences. The procedure is similar to that in the simulation of PFPE Z molecules; the only difference is that the interactions among endgroups and between endgroups and substrate are included. Each movement of a molecule includes a change of position as well as a flip of spin, which depends on whether it is energetically favorable. Each MC step randomly interrogates every molecule exactly one time. The movement of an interrogated molecule depends on whether the projected site is empty and whether a favorable system energy change is associated with the movement.

III. SIMULATION The immediate goal of our simulation is to construct reliable tools that accurately describe the dynamic behavior of ultrathin PFPE films, including the fundamental mechanisms of film dewetting and rupture due to instability arising from nanoscale temperature and pressure inhomogeneity as well as modeling thermally induced desorption or evaporation resulting in PFPE lubricant loss. Our ultimate goal is to construct a reliable numerical software to be used in an integrated simulation of the lubricant, airbearing, and nanoscale heat transfer in head/media (see Figs.

Note that Ajrodi et al. [104] observed that the iso-free-volume viscosities of Zdol were linearly proportional to MW above their glass transition temperatures. In contrast, we observed a crossover behavior for ZdolTX possessing bulky endgroups. Crossover behavior has been reported for the molecular weight dependence on viscosity for PFPEs with bulky endgroups [105,106]. The existence of an MC in ZdolTX data is similar to the reptation processes normally found in high-molecular-weight polymers, which may arise from strong endgroup interactions by forming a ‘‘temporal tube’’-like confinement.

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