当前位置: X-MOL 学术Carbohydr. Polym. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Symmetry breakdown in the sol-gel transition of a Guar gum transient physical network
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2021-01-22 , DOI: 10.1016/j.carbpol.2021.117689
Marouen Zammali , Sijun Liu , Wei Yu

The gelation of the mixture of guar gum and borax in an aqueous solution was studied by diffusing-wave spectroscopy microrheology. The Winter and Chambon power-law domain was evidenced at high-frequency range. The time-cure superposition was applied to the mean square displacement of the probe particles and the critical power-law behavior of the shifting factors was revealed close to the percolation threshold. Morphological characterization revealed the emergence of ribbon-like structures at high borax concentrations. The Rubinstein and Semenov plateau was demonstrated. The correlations between the critical exponents that govern the gelation of the transient networks were reviewed with regard to the scaling laws of both permanent and transient networks. Unlike permanent networks, the relation n+=n- was assumed as the unique condition to establish the hyperscaling laws in transient networks. Whereas, the symmetry breakdown of the longest relaxation time was found to be a common feature of the flowable gels.



中文翻译:

瓜尔胶瞬态物理网络的溶胶-凝胶转变中的对称破坏

通过扩散波谱微流变学研究了瓜耳胶和硼砂混合物在水溶液中的凝胶化。在高频范围内证明了Winter和Chambon幂律域。将时间固化叠加应用于探针颗粒的均方位移,并在接近渗透阈值的范围内揭示了位移因子的临界幂律行为。形态特征表明在高硼砂浓度下出现带状结构。证明了鲁宾斯坦和谢苗诺夫高原。关于永久网络和瞬态网络的缩放定律,对控制瞬态网络凝胶化的关键指数之间的相关性进行了综述。与永久网络不同,这种关系ñ+=ñ--被认为是建立瞬态网络中超尺度定律的唯一条件。然而,发现最长弛豫时间的对称破坏是可流动凝胶的共同特征。

更新日期:2021-02-01
down
wechat
bug