钠蒙脱土水悬浮液在极稀域的流变性和沉降性

IF 2.6 4区 材料科学 Q3 ENGINEERING, CHEMICAL KONA Powder and Particle Journal Pub Date : 2020-01-10 DOI:10.14356/kona.2020019
Y. Adachi, Y. Kawashima, Muhamad Ezral Bin Ghazali
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引用次数: 6

摘要

将DLVO理论方案和絮凝体分形结构的概念应用于蒙脱土悬浮液中,揭示了这种粘土分散体的独特性。在这方面,人们承认两种主要制度。第一种是静电分散状态。第二种是凝固状态。在前者中,由粒子表面测量的倒数德拜长度表征的扩散双电层(EDL)的形成尤为重要。具有电粘性效应的特性粘度和屈服应力由EDL的位向存在来解释。在后者中,运输单元是具有有限内聚强度的凝固絮体。仔细观察反映这些因素的沉降过程,以识别凝胶崩塌时形成大絮凝体所产生的湍流。发现凝胶崩溃前的等待时间反映了ph依赖的充电行为。考虑到ph依赖电荷的影响,基于DLVO的两种体系进一步分为五种。所开发的工具可广泛用于涉及不同离子种类、pH、体积分数和有机物质的体系。
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Rheology and Sedimentation of Aqueous Suspension of Na-montmorillonite in the Very Dilute Domain
The scheme of DLVO theory and the concept of fractal structure of flocs applied to the suspension of montmorillonite have revealed out the unique nature of this clay dispersion. In this context, two major regimes are recognized. The first is the electrostatically dispersed regime. And the second is the coagulated regime. In the former, the formation of a diffusive electric double layer (EDL) characterized by reciprocal Debye length measured from the surface of the particle is distinctively important. Intrinsic viscosity with electroviscous effects and yield stress are interpreted by the steric presence of EDL. In the latter, the unit of transportation is a coagulated floc with finite cohesive strength. Sedimentation process reflecting these factors is carefully observed to recognize the turbulence generation by the formation of large flocs at the moment of gel collapse. Waiting time prior to gel collapse was found to be determined reflecting the pH-dependent charging behavior. By taking into account the effect pH-dependent charge, the DLVO based two regimes are further categorized into five. The developed tools can be extensively used for the system involved with different ionic species, pH, volume fraction and organic substances.
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来源期刊
KONA Powder and Particle Journal
KONA Powder and Particle Journal 工程技术-材料科学:综合
CiteScore
8.40
自引率
4.90%
发文量
35
审稿时长
>12 weeks
期刊介绍: KONA publishes papers in the broad field of powder science and technology, ranging from fundamental principles to practical applications. Papers describing technological experience and critical reviews of existing knowledge in special areas are also welcome.
期刊最新文献
Editor’s Preface The 54th Symposium on Powder Technology and Special Lecture for the 30th Anniversary of the Establishment of HPTF The KONA Award 2021 General Information Effects of DEM Parameters and Operating Conditions on Particle Dynamics in a Laboratory Scale Rotating Disc
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