Investigation by atomic force microscopy of forces at the origin of cement cohesion
Investigation by atomic force microscopy of forces at the origin of cement cohesion
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DOI：
10.1016/s0304-3991(00)00091-7
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发表时间：
2001-01-01
期刊：
影响因子：
2.2
通讯作者：
Goudonnet, JP
中科院分区：
文献类型：
--
作者：
Lesko, S;Lesniewska, E;Goudonnet, JP
在水泥浆中，内聚力是间隙离子溶液中硅酸钙水合物 (CSH) 表面之间相互作用的结果。 (N, V, T) 蒙特卡罗模拟表明，相互作用是由于受表面电荷密度、离子浓度和离子价影响的离子关联力造成的。本文涉及通过原子力显微镜 (AFM) 在溶液中直接测量探针与 CSH 纳米粒子覆盖的原子级光滑基底之间的力和相互作用范围。使用不同的电解溶液（Ca(OH)(2)、CaCl2、NaCl、NaOH）来确定流入参数，从而确定作用力的性质。通过选择适当的实验装置和解决方案，研究已成为可能。先前在其上生长 CSH 纳米颗粒的所选探针和基底在允许溶液交换的实验期间的反应性方面是中性的。结果表明，力源自静电性质，与 Derjaguin-Landau-Verwey-Overbeek (DLVO) 理论不同。实验与离子相关力的 (N,V,T) 蒙特卡罗模拟之间存在一致性。这些力是水泥浆内聚力的根源。 (C) 2001 Elsevier Science B.V. 保留所有权利。
In cement paste, the cohesion results of the interactions between calcium silicate hydrate (CSH) surfaces in an interstitial ionic solution. (N, V, T) Monte Carlo simulations show that the interactions are due to the ion correlation forces influenced by the surface charge density, the ionic concentration and the ion valence. This paper deals with the direct measurement in solutions by atomic force microscopy (AFM) of the forces and the interaction ranges between a probe and an atomically smooth substrate covered by CSH nanoparticles. Different electrolytic solutions (Ca(OH)(2), CaCl2. NaCl. NaOH) have been used in order to determine influent parameters permitting to identify the nature of acting forces. Investigations have been rendered possible by selecting appropriate experimental setup and solutions. The selected probe and substrate on which CSH nanoparticles have previously grown are neutral regarding the reactivity during experiments permitting the exchange of solutions. Results show that a force originates from electrostatic nature and differs from Derjaguin-Landau-Verwey-Overbeek (DLVO) theory. Agreement is found between experiments and (N,V,T) Monte Carlo simulations of ionic correlation forces. These forces are at the origin of the cohesion of cement paste. (C) 2001 Elsevier Science B.V. All rights reserved.