Download e-book for kindle: Advances in Chemical Physics 129 by Stuart A. Rice

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 region of the self-discipline. quantity 129 within the sequence maintains to record contemporary advances with major, up to date chapters by way of across the world famous researchers.

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12), we obtain 00 00 G0R ¼ F1 ðot1 Þ ¼ F1 ðFÀ1 2 ðGR ÞÞ ¼ FðGR Þ ð1:13Þ where F1, F2, and F are arbitrary functions. 13) implies that the relationship between G0R and G00R is independent of temperature. Therefore, the G0 –G00 plot (a modified Cole–Cole plot) will depend on temperature via G0, which may strongly depend on temperature for PFPE systems. 21, experimental observations show that the viscosity of polymer melts is dependent on molecular weight (M) as follows: 1. For Mpless ffiffiffiffiffi than the critical value, MC , the viscosity increases linearly with M or M.

23, implying that there exists an underlying similarity between the rheological properties and fly stiction for PFPEs. Karis and Jhon [107] were the first to demonstrate the relationship between the rheological properties and tribological performance of lubricants. We believe that rheological measurements will provide complementary information to the mechanical/tribological performance of HDD lubricants. Shape effect of PFPE molecules or magnetic particles in suspension, including agglomeration phenomena at low concentration, interaction among these particles, and effects of flocs can be examined via solution viscosity (Z) measurement.

132]. From Eqs. 21), the ÁG as a function of thickness h becomes ÁGðhÞ ¼ ÁGd ðhÞ þ ÁGnd ðhÞ z2 ¼ ÀSd 02 À h S nd À Ágnd L cos  !   ph z0 À h þ a exp hm ‘ ð1:22Þ Molecular weight (M) and chain-end functionality of PFPEs are important design parameters for the optimal performance of lubricants. The nd surface energy of PFPEs is approximately proportional to the areal density of polar endgroups, which may be inversely proportional to molecular weight: À1 Ágnd L / M ð1:23Þ Also, assuming Gaussian chain statistics for PFPE conformation in the surface normal direction, we can conjecture that the monolayer thickness is proportional to the average molecular size normal to the surface: hm / M 0:5 ð1:24Þ Note that the disjoining pressure (Å) is defined as the first derivative of Gibbs free energy G, Å ¼ qG=qh, and the slope of disjoining pressure, as a function of film thickness, provides the stability criteria.

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Advances in Chemical Physics 129 by Stuart A. Rice


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