利用自修复聚合物微胶囊对泥沙进行可控憎水处理

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Rui Qi, Ke Chen, Hongjie Lin, Sérgio D. N. Lourenço, Antonios Kanellopoulos
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引用次数: 0

摘要

疏水土具有疏水功能涂层,可延缓或限制水的渗透,从而防止基础设施失效和长期退化。随着时间的推移,疏水土会在外部压力的作用下发生降解,导致其功能特性丧失。最初为自愈应用而开发的微胶囊方法成为一种潜在的解决方案,可增强、转换(从亲水性)或延长疏水土的寿命。本研究的目的是生产和调查微胶囊技术在颗粒材料中对外界刺激赋予疏水性的有效性。在这项研究中,利用离子凝胶法将具有疏水特性的聚二甲基硅氧烷(PDMS)封装在海藻酸钙微胶囊中。通过将沙子与微胶囊混合,并量化接触角和水滴渗透时间(衡量疏水性的指标)在外部触发(即干燥和连续润湿-干燥循环)下的变化,研究了微胶囊诱导疏水性的效果。结果表明,微胶囊在收缩过程中会释放疏水性物质(PDMS)。干燥后,按沙子质量计算,沙子中的 PDMS 含量增加到 0.1-0.8%。释放出的疏水性物质(PDMS)使沙子具有疏水性,接触角从 29.7°增加到至少 87.7°。聚二甲基硅氧烷的封装量是控制疏水货物释放的关键参数。此外,金沙中 4% 的胶囊含量被认为是诱导疏水性的有效微胶囊含量。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Controllable hydrophobization of sands with self-healing polymeric microcapsules

Controllable hydrophobization of sands with self-healing polymeric microcapsules

Hydrophobized soils have functional hydrophobic coatings to delay or restrict water infiltration and thus prevent infrastructure failure and long-term degradation. Over time, hydrophobized soils will be subjected to degradation under the action of external stresses, leading to the loss of its functional properties. Microencapsulation approaches, initially developed for self-healing applications emerge as a potential solution to enhance, switch (from hydrophilic) or prolong the longevity of hydrophobized soils. The aim of this study is to produce and investigate the effectiveness of microencapsulation to impart hydrophobicity in granular materials in response to external stimuli. In this research, polydimethylsiloxane (PDMS), with hydrophobic properties, is encapsulated in calcium alginate microcapsules with the ionic gelation method. The effectiveness of the microcapsules to induce hydrophobicity is investigated by mixing sand with microcapsules and quantifying the change of the contact angle and water drop penetration time (measures of hydrophobicity) under an external trigger, i.e., under drying and consecutive wetting–drying cycles. The results show that microcapsules release the hydrophobic cargo (PDMS) during shrinkage. After drying, the PDMS content in sand increased to 0.1–0.8% by mass of sand. The released hydrophobic cargo (PDMS) induced hydrophobicity in sands, reflected by a contact angle increase from 29.7° to at least 87.7°. The amount of polydimethylsiloxane encapsulated is a key parameter controlling the release of hydrophobic cargo. In addition, 4% capsule content in sands is identified as an effective microcapsule content in inducing hydrophobicity.

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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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