School of Mechanical Engineering, Yeungnam University, Gyeongbuk, 712-749, Republic of Korea.
School of Mechanical Engineering, Vellore Institute of Technology, Vellore, Tamil Nadu, 632014, India.
Environ Sci Pollut Res Int. 2022 Feb;29(6):8731-8745. doi: 10.1007/s11356-021-16220-3. Epub 2021 Sep 7.
This research article discusses properties such as density, thermal conductivity, and electrical conductivity of solar glycol with amine-functionalized graphene and multi-walled carbon nanotubes (MWCNTs). The hybrid nanofluid is prepared by dispersing the amine-functionalized graphene (AFG) and MWCNTs (50:50 in % by weight ratio) in pure solar glycol. The AFG and MWCNTs are dispersed in different volume concentrations of 0.05%, 0.1%, and 0.15% through the classical two-step homogenizing technique. Good colloidal stability nanofluid are prepared with Gum Arabic (non-covalent) as the surfactant. The stability of nanofluids is ensured through scanning electron microscopy, UV-Vis spectrometer, and zeta potential analyzer. The nanofluid thermal conductivity is measured with varying the nanomaterial loading from 0.05 to 0.15 vol% using a KD2 pro thermal analyzer. The thermal conductivity and electrical conductivity of nanofluid augmentations are considerably with an increasing volume concentration of AFG and MWCNT loading. The thermal conductivity of the AFG-MWCNT-based hybrid nanofluid is augmented by 8.59% for the maximum concentration of 0.15 vol% at 50 °C. The electrical conductivity of the solar glycol-based nanofluids is enhanced linearly with increased operating temperatures. The maximum electrical conductivity enhancement attained is ~28.85% at a nanoparticle loading of 0.15 vol% and 70 °C.
本文讨论了太阳能二醇中胺功能化石墨烯和多壁碳纳米管（MWCNT）的密度、热导率和电导率等特性。通过经典的两步均质技术，将胺功能化石墨烯（AFG）和 MWCNT（按重量比 50:50 混合）分散在纯太阳能二醇中，制备了混合纳米流体。使用阿拉伯树胶（非共价）作为表面活性剂，制备了具有良好胶体稳定性的纳米流体。通过扫描电子显微镜、紫外可见分光光度计和zeta 电位分析仪确保纳米流体的稳定性。使用 KD2 pro 热分析仪，在纳米材料负载从 0.05 增加到 0.15 体积%的过程中，测量了纳米流体的热导率。随着 AFG 和 MWCNT 负载的体积浓度增加，纳米流体的热导率和电导率得到了显著提高。在 50°C 时，最大浓度为 0.15 体积%的情况下，AFG-MWCNT 基混合纳米流体的热导率提高了 8.59%。太阳能二醇基纳米流体的电导率随工作温度的升高呈线性增加。在 0.15 体积%的纳米颗粒负载和 70°C 的条件下，获得的最大电导率增强约为 28.85%。
