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Microemulsions (dispersions of water droplets, typical radius about 10 nm, in oil) show a particular percolation pattern, a so-called dynamical percolation. Predictions of scaling theory and Monte Carlo simulations were compared with experimental static and frequency dependent conductivity data. The latter gives evidence of two different time scales of charge transport.Dedicated to Professor Harry Thomas on the occasion of his 60th birthday 相似文献
3.
Solutions of blockcopolymers (POE-b-PI-b-POE) in fluids of interacting aqueous nanodroplets (W/O microemulsions) are studied. The interaction strength between the (pseudo) two components is measured by the shift of the percolation temperature relative to that of the pure microemulsion. A quantitative measure of the interaction, the differential heat of solution, is thermodynamically related to the slopes of the equilibrium temperature of the system with varying monomeric nanodroplet concentration and the experimental percolation line in the presence of copolymer. 相似文献
4.
Temperature-controlled change of charge transport mechanisms in nonionic water-in-oil microemulsions
The temperature-controlled transition from the Stokes charge transport of aqueous nanodroplets to the intrinsic conduction
of nanodroplet clusters in nonionic microemulsions was studied. Two different charge transport processes apparent from a minimum
value of the conductance have been simulated based on straightforward physical models. Their predictions compare favourably
with the observations.
Received: 4 September 2001 Accepted: 20 September 2001 相似文献
5.
Summary Hydrogen has been analysed quantitatively in a-Si1–xGex:H alloys by SIMS with H variation from 1×1019 –1.3×1022 atoms/cm3 and x between 0 and 1. To quantify the absolute H concentration, SIMS measurements have been calibrated with nuclear reaction analysis, which exhibits excellent agreement with SIMS data for the total range of H and Ge variance. From abundances of the molecule ions SiH+ and GeH+ the fractions H bound to Si or Ge can be discerned and are in good accordance with quantification of SiH and GeH stretching modes in IR spectroscopic measurements. Preferential attachment of H to Si compared to Ge by a factor of 3.5 is determined for glow discharge a-SiGe:H samples; during annealing up to 900 K only small changes of this factor are observed. 相似文献
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It is shown that interference peaks in mass analysed ion kinetic energy spectra can also occur from ions decomposing in the accelerating region of the ion source. 相似文献
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Ohne ZusammenfassungDie gemeinsame Arbeit der Autoren wurde durch Einladungen nach Bonn (SFB40) und Berlin (TUB) sehr gefördert 相似文献
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Wolfgang Meier Hans-Friedrich Eicke Michael Odenwald 《Colloids and surfaces. A, Physicochemical and engineering aspects》1996,110(3):287-292
The influence of ABA-triblock copolymers on the temperature-induced infinite droplet cluster formation in water/oil-microemulsions is studied. The effects of the different blocks of the polymer can be well separated. With the help of an Ehrenfest relation the coupling between the elastically-induced shift of the infinite cluster formation temperature Tc and the plateau modulus of the resulting microemulsion networks is described. 相似文献