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Relation between structure and stability of toothpaste with two-step yielding
Rheologica Acta ( IF 2.3 ) Pub Date : 2020-02-04 , DOI: 10.1007/s00397-019-01183-7
Amit Ahuja , Iraklis Pappas , Andrei Potanin

Rheological measurements are performed to examine the yielding behavior of different commercial and lab-made toothpaste. Several toothpaste are reported to yield via a two-step process which is noted in dynamic oscillatory strain sweeps. The two-step yielding is best seen as two plateaus for storage modulus in a typical plot of storage modulus as a function of applied strain amplitude. Such behavior in structured materials is usually attributed to rupture of the network at lower strains which is followed by the breakup of aggregates at higher strains. In the case of toothpaste, the network and aggregates are formed by particles, such as silica, mediated by polymers, such as xanthan gum and carboxymethyl cellulose. The toothpaste in which such two-step yielding is more pronounced are shown to be less stable, i.e., lose their ability to retain shape when deposited on a toothbrush.

中文翻译:

两步屈服牙膏结构与稳定性的关系

进行流变测量以检查不同商业和实验室制造的牙膏的屈服行为。据报道,几种牙膏通过两步过程产生,这在动态振荡应变扫描中被注意到。两步屈服最好被视为储能模量的两个平台,在典型的储能模量与施加的应变幅度的函数关系图中。结构化材料中的这种行为通常归因于网络在较低应变下的破裂,然后在较高应变下聚集体破裂。在牙膏的情况下,网络和聚集体由颗粒(例如二氧化硅)形成,由聚合物(例如黄原胶和羧甲基纤维素)介导。这种两步屈服更明显的牙膏表现出不太稳定,即,
更新日期:2020-02-04
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