The colloidal dispersion of biopolymer-treated HNTs in the cementitious environment was studied. Three different biopolymer treatments, namely casein (C), guar gum (GG), and xanthan gum (XG), were utilized to prepare the stable colloidal dispersions of HNTs in such environments. The examination of the dispersion and time-dependent stability of untreated HNTs in a synthetic pore solution (SPS) revealed rapid agglomeration and settling of the particles. Specifically, the stabilization of XG-treated HNTs was superior compared to those treated with GG and C biopolymers. XG-treated HNT suspension in the pH 13 environment existed as monodisperse nanoparticles centered around 20 nm, while bare HNTs existed as polydisperse across 200 nm to 7000 nm. Moreover, XG-treated HNTs boosted cement mortar samples, increasing compressive strength by 29.4 % and reducing initial and final water absorption by 15.8 % and 19.9 %, respectively, after 90 days. Furthermore, the microstructural morphology of the HNT-XG-modified mortar exhibited improved compactness and homogeneity.

中文翻译：

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生物聚合物辅助稳定埃洛石纳米管在碱性环境中的分散及其在水泥基复合材料中的应用


研究了生物聚合物处理过的 HNT 在水泥环境中的胶体分散情况。采用三种不同的生物聚合物处理，即酪蛋白 (C)、瓜尔胶 (GG) 和黄原胶 (XG)，在此类环境中制备稳定的 HNT 胶态分散体。对未经处理的 HNT 在合成孔隙溶液 (SPS) 中的分散性和时间依赖性稳定性的检查表明，颗粒快速团聚和沉降。具体而言，XG 处理的 HNT 的稳定性优于 GG 和 C 生物聚合物处理的 HNT。在 pH 13 环境中，XG 处理的 HNT 悬浮液以 20 nm 左右的单分散纳米颗粒形式存在，而裸露的 HNT 以 200 nm 至 7000 nm 的多分散形式存在。此外，经过 XG 处理的 HNT 增强了水泥砂浆样品，90 天后，抗压强度提高了 29.4%，初始和最终吸水率分别降低了 15.8% 和 19.9%。此外，HNT-XG改性砂浆的微观结构形态表现出改善的致密性和均匀性。