Impedance spectroscopy interpretation of silica and polystyrene colloidal suspensions
10.1016/j.matchemphys.2020.122620
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/178749
Tipus de documentArticle
Data publicació2020-03-01
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
ProjecteCELULAS SOLARES CON CONTACTOS POSTERIORES BASADAS EN SUBSTRATOS DELGADOS DE SILICIO CRISTALINO (AEI-TEC2017-82305-R)
INSTRUMENTACION PARA CARACTERIZAR EL ENTORNO MARCIANO EN MISIONES DE LA NASA: SENSORES DE VIENTO PARA MEDA (CONCLUSION DE LAS FASES D Y E) (AEI-RTI2018-098728-B-C33)
INSTRUMENTACION PARA CARACTERIZAR EL ENTORNO MARCIANO EN MISIONES DE LA NASA: SENSORES DE VIENTO PARA MEDA (CONCLUSION DE LAS FASES D Y E) (AEI-RTI2018-098728-B-C33)
Abstract
Impedance spectroscopy differences between colloidal 295-nm silica and 300-nm polystyrene nanoparticles in deionized water are analyzed in this work. Using two different two-electrode measurement setups, designed for this application, impedance spectroscopy measurements performed directly in the colloidal suspensions with same nanoparticles size, shape and concentration, are fitted using Randles circuit models. The parameter analysis allows to identify the suspension response, the electrode-suspension interfaces response and nanoparticle double layer response. The first measurement system consists of a two aluminum wire electrodes characterized in a frequency range from 0.1Hz to 100 kHz while the second system was two square stainless steel electrodes characterized from 0.1Hz to 5 MHz. According to the results, polystyrene nanoparticles suspension presents higher conductivity and higher values of capacitance than silica suspension. It is revealed that as the nanoparticle concentration decreases, the suspension conductivity decreases for both colloidal suspensions. On the other hand, the electrode polarization effect contributed with high impedance and capacitance values, but showed a contrary behavior with the variation of the nanoparticles concentration. These differences found mainly arise because of the hydrophilic and hydrophobic nature of the silica and polystyrene nanoparticle surfaces.
Descripció
© <2020> Elsevier. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
CitacióVéliz, B. [et al.]. Impedance spectroscopy interpretation of silica and polystyrene colloidal suspensions. "Materials chemistry and physics", 1 Març 2020, vol. 243, p. 122620:1-122620:8.
ISSN0254-0584
Versió de l'editorhttps://www.sciencedirect.com/science/article/abs/pii/S025405842030002X
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