Süleyman Demirel University, Faculty of Arts and Sciences, Department of Chemistry, Isparta, Turkey.
Carbohydr Res. 2010 Mar 30;345(5):672-9. doi: 10.1016/j.carres.2009.12.025. Epub 2010 Jan 6.
Considerable scientific and industrial interest is currently being focused on a class of materials known as electrorheological (ER) fluids, which display remarkable rheological behaviour, being able to convert rapidly and repeatedly from a liquid to solid when an electric field (E) is applied or removed. In this study, biodegradable cellulose was modified and converted to their carboxyl salts. Modified cellulose is characterised by Fourier transform infrared (FTIR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA) and conductivity measurements. Suspensions of cellulose (C) and modified cellulose (MC) were prepared in insulated corn oil (CO). The effects of electric field strength, shear rate, shear stress, temperature, etc. of these suspensions onto ER activity were determined. Rheological measurements were carried out via a rotational rheometer with a high-voltage generator to investigate the effects of electric field strength and particle concentration on ER performance. The results show that the ER properties are enhanced by increasing the particle concentration and electric field strength. Also the cellulose-based ER fluids exhibit viscoelastic behaviour under an applied electric field due to the chain formation induced by electric polarization between particles.
目前，科学界和工业界都对一类被称为电流变（ER）流体的材料产生了浓厚的兴趣，这类材料具有显著的流变性能，在施加或移除电场（E）时能够迅速且反复地从液体转变为固体。在这项研究中，对可生物降解的纤维素进行了改性，并将其转化为羧酸盐。改性纤维素的特征在于傅里叶变换红外（FTIR）光谱、核磁共振（NMR）光谱、能谱（EDS）、热重分析（TGA）和电导率测量。将纤维素（C）和改性纤维素（MC）悬浮液在绝缘玉米油（CO）中制备。测定了这些悬浮液的电场强度、剪切速率、剪切应力、温度等对 ER 活性的影响。通过带有高压发生器的旋转流变仪进行流变测量，以研究电场强度和颗粒浓度对 ER 性能的影响。结果表明，通过增加颗粒浓度和电场强度可以提高 ER 性能。此外，由于颗粒间的电偶极子极化引起的链形成，基于纤维素的 ER 流体在施加电场时表现出粘弹性行为。
