CSH/SiO2和CSH/PVP-co-PAA界面黏附力的纳米尺度测量和原子尺度机制

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-04-23 DOI:10.1016/j.cemconres.2025.107900

Gang Qiao , Yuyang Zhao , Pan Wang , Dongshuai Hou , Binmeng Chen

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引用次数: 0

摘要

水合硅酸钙（CSH）与聚合物之间的界面对其机械性能和耐久性至关重要。然而，在纳米尺度上直接测定界面力学的实验尚未见报道。本文利用原子力显微镜（AFM）和接枝聚（1-乙烯基吡咯烷酮-丙烯酸）（PVP-co-PAA）在原子力显微镜尖端测量 CSH 和 PVP-co-PAA 在四种 C/S 条件下的纳米级界面特性。首次清晰地呈现了界面力曲线。结果表明，与代表二氧化硅的原样针尖相比，粘附力和能量耗散分别增加了 72.42 % 和 417 %。界面分离速度延迟了 300 % ～ 400 %。界面分离的分子模拟与原子力显微镜实验结果一致，界面离子对、动力学稳定性和聚合物构象变化为原子力显微镜实验提供了关于粘附力和界面分离速度延迟的启示。原子力显微镜实验对界面力学的确定和分子模拟对 CSH/PVP-co-PAA 界面的深入解读。

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Nanoscale measurement of adhesion forces and atomic-scale mechanisms at CSH/SiO2 and CSH/PVP-co-PAA interfaces

Interface between calcium silicate hydrate (CSH) and polymers is crucial for the mechanical properties and durability. However, direct experimental determination of interfacial mechanics at nanoscale has not been reported. Herein, atomic force microscopy (AFM) with grafted Poly (1-vinylpyrrolidone-co-acrylic acid) (PVP-co-PAA) on AFM tips were utilized to measure interfacial properties between CSH and PVP-co-PAA under four C/S at nanoscale. The interfacial force curves were clearly presented for the first time. Results showed that compared to as-received tip, representing SiO₂, the adhesive force and energy dissipation increased by 72.42 % and 417 %. Interface separation speed was delayed by 300 % ∼ 400 %. Molecular simulations of interfacial separation aligned with AFM experimental results, where interfacial ion-pair, dynamics stability and polymer conformational changes provided insights for AFM experiment on adhesion force and delay of interface separation speed. Determination of interfacial mechanics by AFM experiment and insights by molecular simulation decoded CSH/PVP-co-PAA interfaces thoroughly.

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.