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简单离子通过粒子间作用力控制方解石凝胶的弹性。

Simple ions control the elasticity of calcite gels via interparticle forces.

作者信息

Liberto Teresa, Barentin Catherine, Colombani Jean, Costa Anna, Gardini Davide, Bellotto Maurizio, Le Merrer Marie

机构信息

Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France; Faculty of Civil Engineering, Vienna University of Technology, Adolf Blamauergasse 1-3, A-1030 Vienna, Austria(1).

Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622 Villeurbanne, France; Institut Universitaire de France, France.

出版信息

J Colloid Interface Sci. 2019 Oct 1;553:280-288. doi: 10.1016/j.jcis.2019.05.083. Epub 2019 Jun 1.

Abstract

Suspensions of calcite in water are employed in many industrial fields such as paper filling, pharmaceutics or heritage conservation. Whereas organics are generally used to tune the rheological properties of the paste, we also expect simple ions to be able to control the suspension rheology via the interparticle forces. We have thus investigated the impact of calcium, sodium and hydroxide ions on the elasticity of a colloidal gel of nanocalcite. We confront our macroscopic measurements to DLVO interaction potentials, based on chemical speciation and measurements of the zeta potential. Upon addition of calcium hydroxide, we observe a minimum in shear modulus, correlated to a maximum in the DLVO energy barrier, due to two competing effects: Calcium adsorption onto calcite surface rises the zeta potential, while increasing salt concentration induces stronger electrostatic screening. We also demonstrate that the addition of sodium hydroxide completely screens the surface charge and leads to a more rigid paste. A second important result is that carbonation of the calcite suspensions by the atmospheric CO leads to a convergent high elasticity of the colloidal gels, whatever their initial value, also well rationalized by DLVO theory and resulting from a decrease in zeta potential.

摘要

方解石在水中的悬浮液被应用于许多工业领域,如纸张填充、制药或文物保护。虽然通常使用有机物来调节浆料的流变性能,但我们也期望简单离子能够通过颗粒间作用力来控制悬浮液的流变学。因此,我们研究了钙离子、钠离子和氢氧根离子对纳米方解石胶体凝胶弹性的影响。我们将宏观测量结果与基于化学形态和zeta电位测量的DLVO相互作用势进行对比。加入氢氧化钙后,我们观察到剪切模量出现最小值,这与DLVO能垒的最大值相关,这是由于两种相互竞争的效应:方解石表面的钙吸附使zeta电位升高,而盐浓度增加会导致更强的静电屏蔽。我们还证明,加入氢氧化钠会完全屏蔽表面电荷并导致浆料更坚硬。另一个重要结果是,无论初始值如何,大气中的二氧化碳对方解石悬浮液的碳化都会导致胶体凝胶的高弹性趋同,这也可以通过DLVO理论很好地解释,并且是由zeta电位降低导致的。

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