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<p>Currently, one of the solutions for recycling by-products of technological processes that accumulate as production waste is their use as functional materials of electronics. The main objective of our study was to determine the sensitivity of samples to air humidity using impedance spectroscopy. The properties of samples obtained by uniaxial and isostatic pressing methods from calcium sulfate hemihydrate and calcium sulfate dihydrate were studied. The impedance of the samples was studied as a function of relative air humidity at different frequencies. Cyclic dependencies of the complex resistance response were observed when relative humidity varied in the range 40 to 80% within the frequency range from 200&#xa0;Hz to 1&#xa0;MHz. Based on the results of the studies, a conclusion was made about the possibility of practical application of waste from the technological process of producing food citric acid, citrogypsum, as a source for obtaining a new material for an air humidity sensor.</p>

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Using citric acid production waste as a new material for an air humidity sensor

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • T. B. Nikulicheva,
  • V. S. Zakhvalinsky,
  • V. V. Vyazmin,
  • I. S. Nikulin,
  • O. A. Telpova,
  • V. B. Nikulichev

摘要

Currently, one of the solutions for recycling by-products of technological processes that accumulate as production waste is their use as functional materials of electronics. The main objective of our study was to determine the sensitivity of samples to air humidity using impedance spectroscopy. The properties of samples obtained by uniaxial and isostatic pressing methods from calcium sulfate hemihydrate and calcium sulfate dihydrate were studied. The impedance of the samples was studied as a function of relative air humidity at different frequencies. Cyclic dependencies of the complex resistance response were observed when relative humidity varied in the range 40 to 80% within the frequency range from 200 Hz to 1 MHz. Based on the results of the studies, a conclusion was made about the possibility of practical application of waste from the technological process of producing food citric acid, citrogypsum, as a source for obtaining a new material for an air humidity sensor.