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Hasan Guleryuz Ingeborg Kaus Claudine Filiàtre Tor Grande Mari-Ann Einarsrud 《Journal of Sol-Gel Science and Technology》2010,54(2):249-257
Deposition of silica thin films on silicon wafer was investigated by in situ mass measurements with a microbalance configured
for dip coating. Mass change was recorded with respect to deposition time when the substrate was fully immersed in the silica
sol. Mass gain during deposition was higher than predicted from monolayer coverage of silica nano particles. This implied
that deposition was facilitated by gelling of the nanoparticles on the substrate. The rate of deposition was enhanced by increasing
the particle concentration in the sol and by decreasing the particle size from 12 to 5 nm. Increasing the salt concentration
of the silica sol at constant pH enhanced the deposition of the silica particles. Reducing the pH of the sol from 10 to 6
decreased the deposition rate due to aggregation of the primary silica particles. 相似文献
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Akin Ozdemir Ihsan Pehlivan Akif Akgul Emre Guleryuz 《Chinese Journal of Physics (Taipei)》2018,56(6):2852-2864
A strange novel three-dimensional quadratic continuous autonomous chaotic system with fully golden proportion equilibria is proposed. It has only seven terms, three quadratic nonlinearities and one parameter ‘a’. The system equations have four equilibrium points and very interestingly all the equilibrium points have fully golden proportion values. Besides, this chaotic system has hidden amplitude control properties. The dynamic analyses of the system are presented such as equilibrium points, dissipativity, Lyapunov exponents, bifurcation diagrams, phase portraits and hidden amplitude control properties. Later, electronic circuit of the system is simulated in software and implemented in real environment. Finally, microcomputer-based random number generator (RNG) application and its NIST-800-22 tests are executed as another real-time application. 相似文献
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Guleryuz Hasan Røyset Arne K. Kaus Ingeborg Filiàtre Claudine Einarsrud Mari-Ann 《Journal of Sol-Gel Science and Technology》2012,62(3):460-469
Interaction forces and adhesion between a silica sphere and a flat silica surface in aqueous electrolyte solutions were investigated
by atomic force microscopy. The forces were measured as a function of surface separation, pH and NaCl concentration as the
surfaces were approaching each other. The adhesion force was determined upon retraction with respect to pH, NaCl concentration
and contact time. The magnitude of the long range repulsive force was decreasing with decreasing pH. A short range repulsive
force was observed at pH = 2, but no long range repulsive forces were observed at this pH. Force measurements showed that
adhesion of silica surfaces in water was obstructed by short and long range repulsive forces. Adhesion was enhanced when both
the long and the short range repulsive force was mitigated. A maximum adhesion force of 7.8 mN/m was measured at pH = 12.5
when the short range force vanished and the long range repulsive force was reduced by increasing the NaCl concentration. At
pH = 12.5, the work of adhesion was calculated to be 1.2 mJ/m2 according to the Derjaguin–Muller–Toporov (DMT) model. Adhesion energy was much less at pH = 2 (0.3 mJ/m2) due to persistive short range repulsion. 相似文献
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