College of Engineering, China Agricultural University, P.O. Box 50, 17 Qinghua Donglu, Beijing 100083, China.
Carbohydr Polym. 2013 May 15;94(2):782-90. doi: 10.1016/j.carbpol.2013.02.004. Epub 2013 Feb 14.
The effect of addition of NaCl on rheological properties of suspensions containing vacuum freeze dried starch nanoparticles was studied. These starch nanoparticles were produced through high pressure homogenization and emulsion cross-linking technique. Rheological properties such as continuous shear viscosity, storage and loss moduli and creep-recovery were measured. The presence of NaCl at concentration (5-15%, w/v) increased viscosity marginally (p>0.05) while at 20% (w/v) it significantly (p<0.05) increased viscosity. The presence of NaCl enhanced heat stability and weakened gelling capacity of suspensions. NaCl concentration below 15% (w/v) marginally (p>0.05) increased the storage and loss moduli of suspensions. At 20% (w/v), NaCl increased both moduli significantly (p<0.05) within frequency range tested (0.1-10 rad/s). Creep-recovery behavior was affected by NaCl and recovery rate was the highest (98.6%) at 20% (w/v) NaCl. The Cross, Power Law and Burgers' models followed experimental shear viscosity, storage and loss moduli and creep-recovery data reasonably well (R(2)>0.94).
研究了添加 NaCl 对含有真空冷冻干燥淀粉纳米颗粒悬浮液流变性的影响。这些淀粉纳米颗粒是通过高压均质和乳液交联技术制备的。测量了连续剪切粘度、储能模量和损耗模量以及蠕变恢复等流变性能。在 5-15%（w/v）浓度下，NaCl 的存在略微增加了粘度（p>0.05），而在 20%（w/v）时，粘度显著增加（p<0.05）。NaCl 的存在增强了悬浮液的热稳定性，削弱了其胶凝能力。在 15%（w/v）以下，NaCl 略微增加了悬浮液的储能和损耗模量（p>0.05）。在 20%（w/v）时，NaCl 在测试的频率范围内（0.1-10 rad/s）显著增加了两个模量（p<0.05）。NaCl 对蠕变恢复行为有影响，在 20%（w/v）NaCl 时恢复率最高（98.6%）。Cross、Power Law 和 Burgers 模型很好地拟合了实验剪切粘度、储能和损耗模量以及蠕变恢复数据（R(2)>0.94）。
