Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of surfactant crystallization on the aggregation rate of
  dodecane-in-water nanoemulsions. Changes in the viscosity of the external
  phase   Rates of aggregation of dodecane-in-water (d/w) nanoemulsions stabilized with
7.5 mM sodium dodecylsulfate (SDS) are evaluated beyond 500 mM NaCl. As in the
case of hexadecane-in-water (h/w) emulsions, it is found that flocculation
rates apparently decrease with the ionic strength, departing appreciably from
theoretical predictions. Since many-particle simulations proved to be very time
consuming, an accurate knowledge of experimental parameters is necessary prior
to the realization of further evaluations. Here, the change in the viscosity of
the aqueous solution due to the surfactant phase behavior is considered as a
possible cause of referred phenomenon. The influence of the external viscosity
on the outcome of the simulations is appraised using a quotient between the
actual viscosity of the surfactant solution at a given salt concentration and
its value in the absence of salt. For that purpose, the viscosity of 0.5 and
7.5 mM SDS solutions was measured between 300 an 900 mM NaCl for temperatures
of 20 and 25 {\deg}C. It is concluded that the augment of the aqueous viscosity
due to the formation of surfactant crystals diminish significantly the
aggregation rate. Yet this decline seems insufficient to justify the observed
reduction of kFC at 25 C. Nevertheless, it is noteworthy that a 5-degree change
in the temperature of the surfactant solution causes a remarkable decrease of
kFC . Additionally, a set of two-particle simulations is used here to
illustrate the limitations of this methodology for the appraisal of the
viscosity contribution. It is confirmed that such approach is only convenient
to study the effect of the interaction potential on the aggregation rate, as it
was formerly conceived by Fuchs [1936].

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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: nlin
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-th
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys