粒子硬度和表面特性对密集微凝悬浮的非线性粘弹性的影响
Jacopo Vialetto1, Shivaprakash N Ramakrishna2, Lucio Isa2
1Department of Chemistry "Ugo Schiff", University of Florence, via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy; Laboratory for Soft Materials and Interfaces, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, 8093 Zürich, Switzerland; Consorzio interuniversitario per lo sviluppo dei Sistemi a Grande Interfase (CSGI), via della Lastruccia 3, 50019 Sesto Fiorentino (FI), Italy.
Journal of colloid and interface science
|June 15, 2024
概括
颗粒表面特性和内部软度是密集的体悬浮机制的关键. 定制这些特性允许控制材料流和制造,影响产量和流化行为.
科学领域:
- 材料科学 材料科学 材料科学
- 软物质物理学 软物质物理学
- 体科学 体科学 体科学
背景情况:
- 颗粒表面化学和内部软度从根本上决定了密集的合体悬浮液的机械性能.
- 这些特性决定了悬浮结构和流动,对于材料制造和加工中的应用至关重要.
研究的目的:
- 为了研究颗粒表面特性和内部软度对密集的合体悬浮液的机械反应的显著影响.
- 了解这些参数如何影响剪切下的重组,产量和流化.
主要方法:
- 调节微凝软度,通过调整交叉连接剂的含量 (聚N-异烯胺).
- 通过与聚乙烯糖醇链的共聚合来调整表面特性,以控制粘附,摩擦和模糊性.
- 采用大振幅振荡剪切实验和体探头原子力显微镜.
主要成果:
- 表面特性在较低的包装分数上显著影响机械反应,减少粘附和摩擦,促进更早的产量和流化.
- 增加的软度或模糊性提高了在超高密度下切割的适应性,使得在更广泛的变形范围内实现流化.
- 在不同的包装密度中,表面与内部特性的不同角色被确定.
结论:
- 这些发现为单粒子参数提供了新的见解,这些参数控制了在变形下密悬浮的机械行为.
- 提供了合成策略,用于设计具有精确定制的机械性能的合材料.
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