Effect of high-pressure homogenization on rheological properties of citrus fiber
Effect of high-pressure homogenization on rheological properties of citrus fiber
复制标题
高压均质对柑橘纤维流变性能的影响
DOI：
10.1016/j.lwt.2020.109366
复制
发表时间：
2020-06-01
影响因子：
6
通讯作者：
Wang, Lijun
中科院分区：
文献类型：
--
作者：
Su, Dianbin;Zhu, Xindi;Wang, Lijun
通过大振幅振荡剪切试验，研究了高压均质（0、90和160 MPa）对不同浓度柑橘纤维非线性流变特性的影响。采用傅里叶变换流变学和切比雪夫应力分解方法对试验得到的应力-应变数据进行处理，研究柑橘纤维在非线性区域的粘弹性行为。结果表明，柑橘纤维均质前的悬浮液呈现I型大振幅振荡剪切行为，而高压均质后的纤维悬浮液呈现III型剪切行为，表明分子间相互作用增强。纤维悬浮液的Lissajous曲线表明，非线性区的粘度随浓度的增加而增加。归一化的三阶弹性切比雪夫谐波表明，2.0 g/100 g纤维悬浮液在1000%应变下通过均匀化从应变硬化（0.00208）转变为应变软化（-0.27498）。高压均质作用使剪切行为由剪切稀化转变为剪切稠化。
The effect of high-pressure homogenization (0, 90, and 160 MPa) on the nonlinear rheological of citrus fiber with different concentrations was studied via large amplitude oscillatory shear tests. The strain-stress data obtained from the tests were processed by the Fourier transform rheology and Chebyshev stress decomposition methods to investigate the viscoelastic behavior of citrus fiber in the nonlinear region. The results showed that the citrus fiber suspension before homogenization presented Type I large amplitude oscillatory shear behavior, whereas the Type III shear behavior was found for fiber suspensions after high-pressure homogenization, showing enhanced intermolecular interaction. Lissajous-curves of fiber suspension showed that the viscosity in the nonlinear region increased when the concentration increase. Normalized 3rd elastic Chebyshev harmonics indicated that the 2.0 g/100 g fiber suspension at 1000% strain turned from strain-stiffening (0.00208) to strain-softening (- 0.27498) through the homogenization. Furthermore, the high-pressure homogenization changed the shear behavior from shear-thinning to shear-thickening.