Stuart A. Rice's Advances in Chemical Physics 129 PDF

By Stuart A. Rice

ISBN-10: 0471445274

ISBN-13: 9780471445272

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

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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. 22. The static friction force after extended flying was also measured to evaluate HDD tribological performance.

Relaxation times (tp ) can be obtained from the Rouse theory [99] shown as follows G0 ¼ G0 X ðotp Þ2 2 1 þ ðotp Þ ; and G00 ¼ G0 X otp 1 þ ðotp Þ2 ð1:11Þ with G0  rRT=M, where r is the specific gravity, M is molecular weight, and o is the angular frequency. In the terminal zone of the frequency scale, the properties are dominated by the terminal relaxation time t1  tp ð p ¼ 1Þ: t1 ¼ 6m0 M=p2 rRT, where t1 is weakly dependent on chain length and strongly dependent on endgroup functionality. We found that the PFPE relaxation times were approximately 5 times greater for ZdolTX than Zdol [9,100].

Sketch of the spreading profiles from SME as time progresses (t ¼ 0 to t1): (a) Z, (b) Zdol, and (c) ZdolTX. The coordinate system is drawn in (a). 7. For example, a draw rate of 6 mm/s with a PFPE concentration of 2 g/L generated a ˚ thin film. An SME apparatus (its components are shown in Fig. 8) was 50-A used to measure the thickness of the film as it spread with time. The coated wafer was placed on a pedestal-like plate, housed in an environmental chamber with slits for passage of the incident and reflected beams.

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Advances in Chemical Physics 129 by Stuart A. Rice


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