随机瞬态液固分离揭示了悬浮液中颗粒的多级分散状态

IF 5.8 4区 工程技术 Q1 MECHANICS Applied Rheology Pub Date : 2019-01-01 DOI:10.1515/arh-2019-0005
P. Gane, K. Dimić-Mišić, M. Hummel, M. Welker, S. Rentsch
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引用次数: 0

摘要

摘要:在测量颗粒悬浮液的流变性能时,壁滑移或更常见的液固分离通常被认为是不希望出现的误差来源。然而,在平面边界上排除由多个粒子组成的结构可以反过来揭示该结构的性质以及它与色散中其他元素相互作用的方式。将经过表面处理的地面方解石颗粒分别分散在十六烷(仅分散表面张力成分)和亚麻籽油(既有分散表面张力成分,也有极性表面张力成分)两种比较液体中,研究颗粒表面的相对润湿性。静态状态是粘弹性的,弹性成分反映了相互作用的力网络,这些力作用于粒子一起结构和/或在远程粒子-粒子矩阵中捕获液体。当在板-板几何结构下施加应变时,选定的骨料结构在壁处变得不具有尺寸,导致与大块多分散悬浮液的剪切耦合丧失。在高应变下,给定最佳固体含量,这导致两个离散应力数据集之间的随机过渡,即具有完全剪切耦合和仅部分耦合。随着应变逐步减小,应力恢复随后被监测,随机瞬态现象的消失过程及其量级的平行变化被用来描述原生团聚体的重新形成。相分离的停止表明接近静态结构的重建。在某些条件下,可以观察到这种停止可能伴随着二级状态的松弛,这表明二级但较弱的结构的建立,类似于水性胶体悬浮液中众所周知的双级絮凝。利用小角度光散射照明(SALS)的流变光学观测证实了结构模型从静态(与剪切不耦合)到旋转(与边界定义剪切完全耦合)并最终均匀剪切的转变。
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Stochastic transient Liquid-Solid Phase Separation reveals multi-level Dispersion States of Particles in Suspension
Abstract Wall slip or, more usually, liquid-solid phase separation at the boundary wall when measuring the rheological properties of particulate suspensions is normally considered an undesirable source of error. However, exclusion of a structure consisting of multiple particulates at a planar boundary can, in turn, reveal the nature of that structure and the way it interacts with other elements in the dispersion. Using a system of surface-treated ground calcite particles, designed to control lyophilicity, dispersed, respectively, in two comparative liquids, hexadecane (dispersive surface tension component only) and linseed oil (both dispersive and polar surface tension components), the relative wettability of the particulate surface can be studied. The static state is viscoelastic, with the elastic component reflecting the network of interacting forces acting to structure the particles together and/or to trap liquid within the long-range particle-particle matrix. As strain is applied under plate-plate geometry, selected aggregate structures become size-excluded at the wall, leading to a loss of shear coupling with the bulk polydisperse suspension. At high strain, given optimal solids content, this results in a stochastic transition between two discrete stress data sets, i.e. that with full shear coupling and that with only partial coupling. Stress recovery is subsequently monitored as strain is step-wise reduced, and the progress toward loss of the stochastic transient phenomenon, together with its parallel change in magnitude, is used to describe the re-formation of primary agglomerates. Cessation of the phase separation indicates re-build of the close-to-static structure. Under certain conditions it is observed that the cessation may be accompanied by a secondary relaxation of state, indicating the build of a secondary but weaker structure, likened to the well-known dual-level flocculation in aqueous colloidal suspension. Rheo-optical observations using small angle light scattering illumination (SALS) are used to confirm a structure model switching from static (uncoupled with shear) to rotating (fully coupled to the boundary-defined shear) and finally uniformly sheared.
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来源期刊
Applied Rheology
Applied Rheology 物理-力学
CiteScore
3.00
自引率
5.60%
发文量
7
审稿时长
>12 weeks
期刊介绍: Applied Rheology is a peer-reviewed, open access, electronic journal devoted to the publication in the field of applied rheology. The journal provides the readers with free, instant, and permanent access to all content worldwide; and the authors with extensive promotion of published articles, long-time preservation, language-correction services, no space constraints and immediate publication.
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