This work presents
a mechanistic study of the electrochemical synthesis
of magnetite nanoparticles (NPs) based on the analysis of the electrochemical
impedance spectroscopy (EIS) technique. After a discussion of the
mechanisms reported in the literature, three models are devised and
a prediction of their EIS spectra is presented. The approach consisted
of the simulation of EIS spectra as a tool for assessing model validity,
as EIS allows to characterize the relaxation of adsorbed intermediates.
The comparison between the simulated impedance spectra and the experimental
results shows that the mechanisms proposed to date do not explain
all of the experimental results. Thus, a new model is proposed, in
which up to three adsorbed intermediate species are involved. This
model accounts for the number of loops found in experimental impedance
data. The closest approximation of the features found in the experimental
spectra by this proposed model suggests a better representation of
the reaction mechanism within the evaluated potential range.
Evaluating human thermal comfort has been a difficult task, and sometimes, it has not been possible to consider several of the individual’s physiological characteristics. Nowadays, the development of electronic devices allows measuring new variables and performing a personalised assessment. Skin temperature has been the most measured variable in comfort studies due to its significant role in preserving the thermoregulation principle, which represents the action of the balance of heat flux between the environment and the body. This study aims to accurately present the bioelectrical impedance (BI) as a significant physiological variable to accurately determine thermoregulation and complement thermal sensation questionnaires. A series of environmental chamber tests were conducted. At the same time, the indoor temperature fluctuated between 20◦C and 40◦C, skin BI of the body area was measured in conjunction with skin temperature and comfort survey. The room temperature was controlled while the BI was monitored on the wrist (back), contrasting with the usual methodology for determining thermal comfort. Skin BI on the wrist (back) directly correlates with thermal comfort. The bioelectrical impedance of the skin can be used as an additional variable to identify the inhabitant’s response to space and determine thermal comfort.
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