Centre of Polymer Systems, University Institute, Tomas Bata University in Zlin, Trida Tomase Bati 5678, 760 01 Zlin, Czech Republic.
Soft Matter. 2022 Dec 7;18(47):9037-9044. doi: 10.1039/d2sm01145j.
In this study glucose particles were successfully transformed to conducting carbonaceous microspheres through sequential hydrothermal and thermal carbonization. The prepared carbonaceous particles were thereafter used as a dispersed phase in a novel electrorheological fluid. Due to significant enhancements of the conductivity and dielectric properties when compared with the glucose precursor, the prepared electrorheological fluid based on carbonaceous microspheres exhibited a yield stress of over 200 Pa at a particle concentration of 5 wt% at an electric field intensity of 3 kV mm, and overcomes recently published novel electrorheological fluids and others based on carbonized particles. In order to estimate the exact rheological parameters, the measured data were treated using a mathematical model Cho-Choi-Jhon, and the reproducibility and reversible possibility to control the viscosity of the novel prepared electrorheological fluid were confirmed through time dependence tests at various electric field intensities. Not only did this approach lead to carbonaceous conducting particles with high performance in electrorheology, but the yield after carbonization at 500 °C was also 60%. It was thus confirmed that unique carbonaceous conducting particles were prepared using a sustainable method giving high yields, and can be potentially used in many other applications where such carbonaceous particles are required.
在这项研究中，葡萄糖颗粒通过顺序水热和热碳化成功转化为导电碳质微球。随后，将制备的碳质颗粒用作新型电流变液中的分散相。与葡萄糖前体相比，由于导电性和介电性能显著提高，基于碳质微球的制备电流变液在电场强度为 3 kV mm 时，颗粒浓度为 5 wt%时表现出超过 200 Pa 的屈服应力，并且克服了最近公布的新型电流变液和其他基于碳化颗粒的电流变液。为了估计确切的流变学参数，使用 Cho-Choi-Jhon 数学模型对测量数据进行了处理，并通过在不同电场强度下进行时间依赖性测试，确认了新型制备电流变液的重现性和可逆性控制粘度的可能性。这种方法不仅导致电流变性能高的碳质导电颗粒，而且在 500°C 碳化后的产率也达到 60%。因此，证实了使用可持续方法制备了具有高产量的独特碳质导电颗粒，并可潜在地用于许多其他需要此类碳质颗粒的应用中。
