Point-of-use devices represent
currently a key field in quantitative analytical sciences. These platforms are
low-cost, fast, portable, and simple to use eliminating the necessity for
qualified operators. Rapid tests enable in-situ measurements presenting substantial
social and economic implications at industry, environment, and medicine. One
potential output to perform point-of-use analyses is the accomplishment of the
tests in solution with naked eye detection using disposable systems. It allows
the determination of different analytes from the use of modified nanomaterial.
Naked eye methods bypasses the
use of instrumental readers, an essential feature for in-situ technologies.
Furthermore, the analyses in solution surpass precisionrelated downsides when making
the tests on substrates such as paper. In this case, the diverse paper
substrates that are employed to fabricate the devices affect the flow rates and
interactions with analytes.
This paper reports further
investigations and application of the microemulsification-based method (MEC), a
point-of-use platform that was recently proposed by these authors. It relies on
solutionbased- detection with naked eyes. In contrast with colorimetric tools, MEC
response depends on colloid thermodynamics by relying on effect of analyte
on the entropy of emulsions or Winsor systems. It changes the formation of
thermodynamically stable dispersions, the microemulsions. The minimum volume
fraction of amphiphile needed to get MEs for a fixed water-oil ratio expressed
the analytical signal of the method. The generation of nanodroplets in MEs allows the naked eye detection of ΦME by
monitoring the change of turbidity from the emulsions or Winsor systems.
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