Department of Chemical and Biological Engineering, University of Wisconsin, Madison, WI 53706, USA.
Appl Biochem Biotechnol. 2010 Feb;160(4):1102-15. doi: 10.1007/s12010-009-8606-z. Epub 2009 Mar 31.
The rheological properties of acid hydrolyzed corn stover at high solids concentration (20-35 wt.%) were investigated using torque rheometry. These materials are yield stress fluids whose rheological properties can be well represented by the Bingham model. Yield stresses increase with increasing solids concentration and decrease with increasing hydrolysis reaction temperature, acid concentration, and rheometer temperature. Plastic viscosities increase with increasing solids concentration and tend to decrease with increasing reaction temperature and acid concentration. The solids concentration dependence of the yield stress is consistent with that reported for other fibrous systems. The changes in yield stress with reaction conditions are consistent with observed changes in particle size. This study illustrates that torque rheometry can be used effectively to measure rheological properties of concentrated biomass.
采用转矩流变仪研究了高固含量（20-35wt.%）酸水解玉米秸秆的流变性能。这些材料是屈服应力流体，其流变性能可以用宾汉模型很好地表示。屈服应力随固含量的增加而增加，随水解反应温度、酸浓度和流变仪温度的升高而降低。表观黏度随固含量的增加而增加，随反应温度和酸浓度的升高而降低。屈服应力对固含量的依赖性与其他纤维系统的报告一致。屈服应力随反应条件的变化与观察到的粒径变化一致。本研究表明，转矩流变仪可有效地用于测量浓缩生物质的流变性能。
