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Tubes Monte Carlo simulations with

A. Milchev, W. Paul, K. Binder. Polymer chains confined into tubes with attractive walls A Monte Carlo simulation. Macromol Theory Simul 5 305-323, 1994. [Pg.624]

Since currently available HAPD s are of small diameter, we masked a 2 photomultiplier tube to investigate the dependence of the photoelectron yield on detector area. A masked PMT (with sensitive area 18 mm in diameter) gave 5.4 0.2 photoelectrons or 0.68 0.03 pe/cm with the n = 1.032 aerogel sample. The observed spectrum is shown in Figure 4.15. These results are well-reproduced by a detailed Monte Carlo simulation. We are thus confident that it is possible to extrapolate with results taken with HAPD s of the current size to larger area devices. [Pg.101]

A polymer chain with repulsive interactions between the segments confined into a cylindrical pore has been studied by Monte Carlo simulations by Milchev et al. [115]. Besides the equilibrium conformation of the molecules in the confined geometry, the time-dependent mean-square displacements of the segments was also studied. It is shown fliat relaxation times scaling with hP- as well as hP play a role in the reptative motion of the chain in these tubes. [Pg.197]

Below we will come back to the reptation model in context with the dynamics of polymers confined in tube-like pores formed by a solid matrix. For a system of this sort the predictions for limits (II)de and (III)de (see Table 1) could be verified with the aid of NMR experiments [11, 95] as well as with an analytical formalism for a harmonic radial potential and a Monte Carlo simulation for hard-pore walls [70]. The latter also revealed the crossover from Rouse to reptation dynamics when the pore diameter is decreased from infinity to values below the Flory radius. [Pg.36]

The theoretical background of the confinement effect in (artificial) tubes was recently examined in detail with the aid of an analytical theory as well as with Monte Carlo simulations [70]. The analytical treatment referred to a polymer chain confined to a harmonic radial tube potential. The computer simulation mimicked the dynamics of a modified Stockmayer chain in a tube with hard pore walls. In both treatments, the characteristic laws of the tube/reptation model were reproduced. Moreover, the crossover from reptation (tube diameter equal to a few Kuhn segment lengths) to Rouse dy-... [Pg.105]


See other pages where Tubes Monte Carlo simulations with is mentioned: [Pg.195]    [Pg.558]    [Pg.237]    [Pg.104]    [Pg.2923]    [Pg.248]    [Pg.316]    [Pg.281]    [Pg.439]    [Pg.694]    [Pg.695]    [Pg.310]    [Pg.53]    [Pg.310]    [Pg.140]    [Pg.314]    [Pg.168]    [Pg.42]    [Pg.57]   
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