A novel interpretation of pH-dependent microstructure and rheology evolution in silica suspension based on interparticle interactions

IF 2.3 3区工程技术 Q2 MECHANICS

Rheologica Acta Pub Date : 2024-06-05 DOI:10.1007/s00397-024-01460-0

Hyo-Jeong Lee, Jun Dong Park

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Abstract

We suggest a new interpretation for pH-dependent temporal evolution in the microstructure and rheology of silica suspensions based on interparticle interactions, which differs from the conventional explanation including the catalytic effect of hydroxyl ions and charges. The temporal evolution of silica suspensions under various pH conditions was investigated through rheometry and diffusing wave spectroscopy (DWS) analysis. The transition from liquid to solid was observed to be the most rapid at pH 5 compared to other pH conditions (pH 3, 7, 9). This phenomenon could not be adequately explained by the conventional Derjaguin-Landau-Verwey-Overbeek (DLVO) theory that predicts the liquid-to-solid transition occurs more rapidly at the lower pH condition due to the lower surface charge. As an alternative, we employed an elaborated DLVO theory that additionally considers the hydration force, arising from the hydrophilic nature of the silica surface. The pH dependency was interpreted using the elaborated DLVO theory, which showed that the strong short-range nature of the hydration force significantly reduced the attraction range at pH 3, leading to the retardation and decline in structural and rheological development. The impact of pH and resulting alterations in interparticle interaction on the microstructure were further investigated using rheological scaling theory.

Graphical Abstract

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基于颗粒间相互作用的二氧化硅悬浮液中与 pH 值相关的微观结构和流变演变的新解释

我们基于颗粒间的相互作用，对二氧化硅悬浮液的微观结构和流变学随 pH 值的时间演变提出了一种新的解释，这种解释不同于包括羟基离子和电荷的催化作用在内的传统解释。通过流变仪和扩散波谱（DWS）分析，研究了二氧化硅悬浮液在不同 pH 值条件下的时间演变。与其他 pH 条件（pH 值为 3、7、9）相比，pH 值为 5 时从液态到固态的转变最为迅速。传统的 Derjaguin-Landau-Verwey-Overbeek （DLVO）理论无法充分解释这一现象，该理论预测由于表面电荷较低，液态到固态的转变在较低的 pH 值条件下发生得更快。作为替代方案，我们采用了详细的 DLVO 理论，该理论额外考虑了二氧化硅表面亲水性所产生的水合作用力。详细的 DLVO 理论对 pH 值的依赖性进行了解释，结果表明，水合作用力的强短程性质大大缩小了 pH 值为 3 时的吸引范围，导致结构和流变性发展的延缓和下降。利用流变缩放理论进一步研究了 pH 值及其导致的颗粒间相互作用的改变对微观结构的影响。

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来源期刊

Rheologica Acta 物理-力学

CiteScore

4.60

自引率

8.70%

发文量

审稿时长

3 months

期刊介绍： "Rheologica Acta is the official journal of The European Society of Rheology. The aim of the journal is to advance the science of rheology, by publishing high quality peer reviewed articles, invited reviews and peer reviewed short communications. The Scope of Rheologica Acta includes: - Advances in rheometrical and rheo-physical techniques, rheo-optics, microrheology - Rheology of soft matter systems, including polymer melts and solutions, colloidal dispersions, cement, ceramics, glasses, gels, emulsions, surfactant systems, liquid crystals, biomaterials and food. - Rheology of Solids, chemo-rheology - Electro and magnetorheology - Theory of rheology - Non-Newtonian fluid mechanics, complex fluids in microfluidic devices and flow instabilities - Interfacial rheology Rheologica Acta aims to publish papers which represent a substantial advance in the field, mere data reports or incremental work will not be considered. Priority will be given to papers that are methodological in nature and are beneficial to a wide range of material classes. It should also be noted that the list of topics given above is meant to be representative, not exhaustive. The editors welcome feedback on the journal and suggestions for reviews and comments."