# Sensing Micro-colloid Concentration by Spectral Impedance Measurements and Relaxation Times Analysis

## TL;DR

This paper introduces a spectral impedance and relaxation time analysis method for accurately sensing and quantifying dielectric micro-colloid concentrations in conductive media, demonstrating high sensitivity and resolution.

## Contribution

It presents a novel approach combining electrical impedance spectroscopy and relaxation times analysis to measure micro-colloid concentrations.

## Key findings

- DRT provides a distribution function related to concentration
- High sensitivity and resolution in micro-colloid detection
- Effective mapping from frequency to time constant domain

## Abstract

This paper presents an attractive method towards sensing and quantifying the concentration of dielectric particles suspended in a highly conductive medium. Fast electrical impedance spectroscopy (EIS) measurements were performed, based on an electrochemical setup and a non-parametric unbiased estimator. The impedance data are then mapped from the frequency domain to a time constant domain via the distribution of relaxation times (DRT) model. It is shown that application of DRT can systematically give a distribution function which is directly related with the concentration of micro-colloid samples. As a result, the samples were characterized by high sensitivity and resolution.