纳米粒子聚集对微凝胶复合材料流变性能的可逆控制。

IF 8.3 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Yul Hui Shim, Tae Yeon Kong, So Youn Kim
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引用次数: 0

摘要

微凝胶是一种柔软的材料,具有可调的流变特性,使其在3D打印、药物输送和涂料等应用中非常有用。然而,平衡印刷性和结构稳定性仍然是一个关键的挑战。在这项研究中,为了克服这一问题,我们研究了纳米颗粒聚集作为二氧化硅-卡波波尔微凝胶复合材料的可逆物理交联机制。二氧化硅纳米颗粒的表面电荷对pH值敏感,导致在低pH值下聚集,在高pH值下分散。这种聚集通过增加弹性和屈服应力来增强流变性能,而分散通过允许易于流动而降低流变性能。利用SAXS, NMR和回收流变学,我们表征了这些结构转变,并证明通过调整纳米颗粒的大小,温度和浓度可以加速聚集动力学。这种可调的交联机制可以精确控制微凝胶的行为,使其成为可回收的直墨书写印刷油墨。通过使用pH值和温度控制,我们的方法为创造具有可逆机械性能的微凝胶复合材料提供了一条途径,为先进的油墨配方和可持续材料应用开辟了新的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reversible Control of Rheological Properties in Microgel Composites via Nanoparticle Aggregation.

Microgels are soft materials with tunable rheological properties, making them useful for applications such as 3D printing, drug delivery, and coatings. However, balancing printability and structural stability remains a key challenge. In this study, to overcome this issue, we investigate nanoparticle aggregation as a reversible physical cross-linking mechanism in silica-Carbopol microgel composites. The surface charge of silica nanoparticles is pH-sensitive, resulting in aggregation at low pH and dispersion at high pH. This aggregation enhances rheological properties by increasing elasticity and yield stress, while dispersion reduces the rheological properties by allowing for easy flow. Using SAXS, NMR, and recovery rheology, we characterize these structural transitions and demonstrate that aggregation kinetics can be accelerated by tuning the nanoparticle size, temperature, and concentrations. This tunable cross-linking mechanism allows precise control over microgel behavior, enabling their use as recyclable direct-ink-writing printing inks. By using pH and temperature control, our approach provides a pathway to create microgel composites with reversible mechanical properties, opening new possibilities for advanced ink formulations and sustainable material applications.

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来源期刊
ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces 工程技术-材料科学:综合
CiteScore
16.00
自引率
6.30%
发文量
4978
审稿时长
1.8 months
期刊介绍: ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.
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