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<p>Various samples of nanopowders (NP) of cobalt hydroxide Co(OH)<sub>2</sub> were obtained by the method of chemical precipitation from 10 wt% solutions of cobalt (II)&#xa0;nitrate Co(NO<sub>3</sub>)<sub>2</sub> and sodium hydroxide NaOH with additions of surfactants of four different types with the same concentration of 0.1 wt.%: disodium salt of ethylenediaminetetraacetic acid (EDTA; C<sub>10</sub>H<sub>14</sub>O<sub>8</sub>N<sub>2</sub>Na<sub>2</sub>), cetylpyridinium chloride (CPC; C<sub>21</sub>H<sub>38</sub>ClN), polyethyleneglycol-5000 (PEG-5000; C<sub>2n+2</sub>H<sub>4n+6</sub> O<sub>n+2</sub>, where <i>n</i>=112), and sodium dodecyl sulfate (SDS; C<sub>12</sub>H<sub>25</sub>NaO<sub>4</sub>S). Hydrogen reduction was carried out for specially prepared Co(OH)<sub>2</sub> samples in order to obtain NP of metallic cobalt Co. We study the effect of the investigated surfactants on the thermogravimetric (TG) characteristics of the processes of reduction of cobalt hydroxide Co(OH)<sub>2</sub> samples, as well as on the properties of the obtained products of reduction. For the investigation of the NP samples, we use the thermogravimetry, X‑ray diffractometry, transmission and scanning electron microscopy methods, as well as the measurements of low-temperature nitrogen adsorption specific surface area. It is shown that the application of surfactants makes it possible to intensify the processes of reduction even at low temperatures. It is discovered that the use of SDS makes it possible to obtain highly homogeneous Co NP formed by rounded nanoparticles with the minimum mean size (of about 50–70 nm). The application of surfactants: Na-EDTA, PEG-5000, and SDS with a&#xa0;concentration of 0.1 wt.% is a&#xa0;promising and efficient way to decrease the stages of reduction and accelerate the stages of the process of hydrogen reduction of the Co(OH)<sub>2</sub> NP even at low temperatures.</p>

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Influence of surfactants on the thermogravimetric characteristics and properties of the products of hydrogen reduction processes of cobalt-hydroxide nanopowders

  • 期刊论文

  • 发表日期：

    2026年3月1日

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  • Nguyen Van Minh,
  • Hoang Manh Gioi,
  • Stanislav V. Gorobinsky,
  • Tien Hiep Nguyen

摘要

Various samples of nanopowders (NP) of cobalt hydroxide Co(OH)2 were obtained by the method of chemical precipitation from 10 wt% solutions of cobalt (II) nitrate Co(NO3)2 and sodium hydroxide NaOH with additions of surfactants of four different types with the same concentration of 0.1 wt.%: disodium salt of ethylenediaminetetraacetic acid (EDTA; C10H14O8N2Na2), cetylpyridinium chloride (CPC; C21H38ClN), polyethyleneglycol-5000 (PEG-5000; C2n+2H4n+6 On+2, where n=112), and sodium dodecyl sulfate (SDS; C12H25NaO4S). Hydrogen reduction was carried out for specially prepared Co(OH)2 samples in order to obtain NP of metallic cobalt Co. We study the effect of the investigated surfactants on the thermogravimetric (TG) characteristics of the processes of reduction of cobalt hydroxide Co(OH)2 samples, as well as on the properties of the obtained products of reduction. For the investigation of the NP samples, we use the thermogravimetry, X‑ray diffractometry, transmission and scanning electron microscopy methods, as well as the measurements of low-temperature nitrogen adsorption specific surface area. It is shown that the application of surfactants makes it possible to intensify the processes of reduction even at low temperatures. It is discovered that the use of SDS makes it possible to obtain highly homogeneous Co NP formed by rounded nanoparticles with the minimum mean size (of about 50–70 nm). The application of surfactants: Na-EDTA, PEG-5000, and SDS with a concentration of 0.1 wt.% is a promising and efficient way to decrease the stages of reduction and accelerate the stages of the process of hydrogen reduction of the Co(OH)2 NP even at low temperatures.